The test is control, in three parts

The IRS weighs three kinds of evidence:[1]

• Behavioral control: does the business direct how the work gets done, not only the result? Set hours, required methods, and training all point toward employee.
• Financial control: who bears the business side? A worker who invests in their own tools, covers their own expenses, and can profit or lose on a job looks like a contractor.
• Relationship: benefits, permanence, and work that is central to your business all point toward employee, whatever the contract is titled.

No single factor decides; the IRS weighs the relationship as it actually operates. A framing sub with their own crew, their own tools, and three other builders is a contractor, while a sub who works your schedule with your tools, only for you, is probably an employee.

What guessing wrong costs

Misclassify a worker without a reasonable basis, and the business owes the back employment taxes, plus penalties and interest.[1]

When a relationship is genuinely unclear, either side can ask the IRS to decide by filing Form SS-8, and a determination takes at least six months.[2]

The two relief programs

• Section 530: erases the back taxes if you had a reasonable basis for calling the worker a contractor, treated every similar worker the same way, and filed the 1099s consistently. Without the 1099s on file, there is no relief.[3]
• The VCSP: the Voluntary Classification Settlement Program lets you reclassify workers going forward by filing Form 8952 at least 120 days ahead and paying 10 percent of one year's employment taxes on their pay, computed at reduced rates, with no penalties, no interest, and no employment tax audit of prior years.[4]

The bottom line

Decide the classification before the first check, collect the W-9 the same day, and keep the 1099 habit, now with a $2,000 threshold, that keeps Section 530 open. Classification even reaches the owner: an S-corp owner who works in the business is an employee of their own company.

If a current worker is hard to classify, a free consultation is a cheaper second opinion than an audit.

References

1. IRS: independent contractor, self-employed, or employee
2. IRS: About Form SS-8, worker status determination
3. IRS: worker reclassification, Section 530 relief
4. IRS: Voluntary Classification Settlement Program

The equipment write-offs are permanent

100 percent bonus depreciation is permanent for equipment acquired and placed in service after January 19, 2025, and the Section 179 limit rose to $2.5 million, phasing out above $4 million in purchases.[1][6] In practice, new and used equipment can be written off in full the year it starts working.

The date rules still decide which year, so the delivery-date timing from the year-end checklist still applies, and equipment acquired before January 20, 2025 falls under the old phase-down at 40 percent.[6]

The 20 percent QBI deduction is permanent too

QBI lets most sole proprietors, partners, and S-corp owners deduct up to 20 percent of business profit, and it was set to expire after 2025. It is now permanent.[1][7]

Two improvements arrive for 2026: the income ranges where the deduction phases down widen to $75,000 for single filers and $150,000 for joint, and anyone with at least $1,000 of QBI from a business they actively work in is guaranteed a deduction of at least $400.[1]

A refund window closes July 6

From 2025 on, domestic research and development costs are deducted in the year they are spent, undoing the 2022 rule that forced them to be spread over five years.[1][2]

Smaller businesses can also reach backward: those averaging $31 million or less in gross receipts may amend their 2022 through 2024 returns to take the deduction in those years, and the amended returns are due by July 6, 2026.[2] Research is broader than laboratory work, and custom software development counts.

If your business built software or developed products in those years, a free consultation before the window closes is worth the half hour.

Less paperwork on 1099s

Two reporting thresholds loosened. Payments to contractors made in 2026 trigger a 1099-NEC at $2,000 rather than $600, a change January's checklist flagged. The 1099-K for card and app payments is back to $20,000 and 200 transactions, undoing the scheduled drop to $600.[1][3]

Tips and overtime: the employer side

The tips and overtime deductions belong to your employees, but the reporting belongs to you: starting with tax year 2026, W-2s must show qualified tips and qualified overtime as their own separate amounts.[4]

For 2025 filings the IRS waived penalties for employers who reported totals correctly without the new breakouts, and that relief ends with the 2026 forms, so payroll systems need the new fields this year.[4]

What is gone

The law ended the clean energy credits on a staggered schedule:[5]

• Clean vehicle credits: ended for vehicles acquired after September 30, 2025.[5]
• Home energy credits: solar and efficiency credits ended for installations completed after December 31, 2025.[5]
• The 179D deduction: the commercial building efficiency deduction is closed to projects whose construction begins after June 30, 2026, while projects that broke ground by that date can still claim it.[5]

The bottom line

Permanent bonus depreciation and QBI reward the same planning as before, the 1099 changes apply to 2026 payments, the W-2 breakouts start with 2026 payroll, and the R&D refund window shuts July 6. The amounts above are the law's starting figures, and most of them index for inflation in later years.[1]

References

1. Public Law 119-21, the One Big Beautiful Bill Act
2. IRS Revenue Procedure 2025-28: retroactive research cost elections
3. IRS: understanding your Form 1099-K
4. IRS: penalty relief for 2025 tips and overtime reporting
5. IRS: FAQs on the ending energy credits and 179D
6. IRS Publication 946: how to depreciate property
7. IRS: qualified business income deduction

The three-year clock

The IRS generally has three years from the day you file to audit a return, and you have the same three years to amend it, so the return and everything supporting it stay for three years.[1] Supporting means the paper behind the numbers: invoices, receipts, deposit records, and canceled checks.[3]

A return filed early is treated as filed on the due date, so a return sent in February started its three years on April 15 like everyone else's.[1]

The reason to keep any of it is burden of proof: in an audit, deposits are income until you prove otherwise, and a deduction without its receipt does not survive.

The exceptions that stretch it

Four situations lengthen the window:

• Four years: employment tax records must be kept at least four years after the tax was due or paid, whichever is later.[1]
• Six years: a return that left off more than 25 percent of gross income can be audited for six years, so a year with messy income keeps its records twice as long.[1]
• Seven years: a deduction claimed for worthless securities or a bad debt keeps its support for seven years.[1]
• Forever: a year with no return, or a fraudulent one, stays open forever; there is no time limit on the audit.[1]

Property and equipment records

Records for anything you depreciate or will someday sell stay until three years after the return that reports the sale, because they prove your basis, the cost your gain or loss is measured against, and every year of depreciation.[1] The purchase invoice for equipment bought years ago is what proves the machine's cost when you sell it.

Arizona TPT: four years

Arizona requires TPT records kept four years from the return's due date or filing date, whichever is later.[2] The exceptions mirror the federal ones: six years when 25 percent or more of gross income is omitted, and no limit for a fraudulent return or none at all.[2]

What can go digital

The IRS accepts electronic records, and every requirement that applies to paper applies to the scan.[3] Scan receipts before you shred the originals; thermal paper fades long before its three years are up.

The bottom line

By this June, a 2022 return with nothing unusual on it is past the federal three years, its payroll and Arizona TPT records need about one more year, and records for property you still own stay. Formation documents, contracts still in force, and current insurance policies are kept for the life of the business.

If a year is messy enough that you are not sure which rule it falls under, a free consultation settles what stays and what goes.

References

1. IRS: How long should I keep records
2. AZDOR: business record keeping
3. IRS: What kind of records should I keep

An LLC is a state-law wrapper rather than a tax category, so the IRS taxes it as whichever of these it defaults or elects into.[2]

Sole proprietors and partners: the draw

You cannot put yourself on payroll. Taking money out is an owner draw: move it to your personal account, record it as a draw, done.[1]

The counterintuitive part is that the draw itself is not taxed, because you are taxed on the business profit whether you take the money out or not. Tax on that profit includes self-employment tax of 15.3 percent for Social Security and Medicare.[4] Nobody withholds any of this for you; the tax on draws gets paid four times a year through quarterly estimated payments.[5] The financial reports post covers the other side of this: a draw lowers your cash but never your profit.

One discipline makes draws clean: move money, do not spend from the business account directly. A recorded draw is bookkeeping; groceries on the business card is commingling.

The partner exception: guaranteed payments

A partner cannot be a W-2 employee of the partnership.[1] What a partnership can do is promise a working partner a fixed amount regardless of profit, called a guaranteed payment: the partnership deducts it as an expense, the partner reports it as ordinary income subject to self-employment tax, and it is the closest thing to a salary a partner can get.[6]

S-corp owners: salary first, then distributions

An S-corp owner who works in the business is an employee of it, and the IRS requires that work to be paid as a real salary through real payroll, with a W-2 at the end of the year, before profits come out as distributions.[3]

The appeal is that distributions avoid the 15.3 percent payroll tax that wages carry. That gap is also the temptation the IRS knows about: a token salary next to large distributions is a known audit profile, and on audit the IRS can reclassify distributions as wages and collect the back payroll taxes with penalties on top.[3] The burden of proving the salary was reasonable falls on you.

C-corp owners: salary, then dividends

A C-corp owner who works in the business is on payroll like any other employee, and profits beyond the salary come out as dividends. Dividends are taxed twice: the corporation pays tax on its profit and gets no deduction for the dividend, and you pay tax on it again personally.[7]

That flips the audit risk into a mirror image of the S-corp problem. Because salary is deductible and dividends are not, the temptation in a C-corp runs toward paying too much salary rather than too little, and the requirement that pay be reasonable cuts in both directions.[1]

What counts as a reasonable salary

There is no formula in the law. The standard the IRS applies is what comparable businesses pay for comparable work, weighed with factors like these:[3]

• Your training, experience, and duties
• How much time you actually devote to the business
• What the role would cost to fill with a non-owner
• What the business pays its other employees

Pay yourself what you would have to pay a stranger to do your job, and keep a note of how you got the number.

What each one looks like on your books

The three methods land differently on your reports:

• Owner draw: not an expense. It reduces your equity, so it never appears on your profit and loss.[1]
• Guaranteed payment: a deductible partnership expense, and ordinary income on the partner's return with no W-2 attached.[6]
• Salary: a real payroll expense that lowers the profit the business reports, with payroll taxes attached.[1]
• Distribution: like a draw, not an expense, and free of payroll tax when the salary behind it is reasonable.[3]
• Dividend: paid from profit the corporation already paid tax on, with no deduction for paying it.[7]

The bottom line

The method follows the entity: draws for sole proprietors, partners, and the LLCs taxed like them, salary plus distributions for S-corps, salary plus dividends for C-corps, and clean records in every case. If you elected S-corp status this spring, payroll is now a legal requirement rather than an option, and a free consultation is enough to set the salary number and the payroll schedule together.

References

1. IRS: Paying yourself
2. IRS: Limited liability company (LLC)
3. IRS: S corporation employees, shareholders and corporate officers
4. IRS: Self-employment tax, Social Security and Medicare
5. IRS: Estimated taxes
6. IRS Publication 541: partnerships
7. IRS Publication 542: corporations

What is due April 15

• Form 1040: your 2025 return, plus payment of anything owed.[1]
• Form 4868: the extension, which moves filing to October 15 but does not move the payment.[2]
• Q1 estimated payment: the first 2026 installment for anyone paying quarterly, paid online or with a Form 1040-ES voucher.[3]
• IRA and HSA contributions: 2025 contributions count until April 15: up to $7,000 in an IRA, $8,000 if you are 50 or older,[4] and $4,300 for self-only or $8,550 for family HSA coverage, plus $1,000 more if you are 55 or older.[5]
• Arizona Form 140: the state return is due the same day, along with any state tax owed.[6]

Who needs what: everyone with a filing requirement files the 1040, Arizona residents add the 140, the extension is only for returns that will not be ready, the Q1 installment is for the self-employed and anyone else whose withholding will not cover what they owe, and the IRA and HSA deadline matters only if you still want to top up 2025.

The extension does not extend the payment

Last month's business extension was free with no strings attached. The personal one has a string: Form 4868 gives you until October 15 to file, but the tax itself is still due April 15, and interest plus a late-payment penalty run on any shortfall from that day.[2]

So the move is to estimate what you owe, pay that amount with the extension, and finish the paperwork when it is ready. Arizona rides along: the state honors your federal extension automatically, you just check the extension box on the return, and at least 90 percent of the state tax must still be paid by April 15 to avoid the extension underpayment penalty.[6]

Four deductions that did not exist last spring

All four come from last July's tax law, apply to 2025 through 2028, and are claimed on the new Schedule 1-A whether or not you itemize.[7]

• Tips: workers in tipped jobs can deduct up to $25,000 of qualified tips, phasing out above $150,000 of income, or $300,000 filing jointly.[8]
• Overtime: the premium half of time-and-a-half pay is deductible up to $12,500, or $25,000 jointly, with the same phase-out.[8]
• Seniors: anyone 65 or older gets an extra $6,000 deduction, $12,000 for a qualifying couple, phasing out above $75,000, or $150,000 jointly.[8]
• Car loan interest: up to $10,000 of interest on a loan for a new, US-assembled personal vehicle. Used cars and leases do not qualify, and the phase-out starts at $100,000, or $200,000 jointly.[8]

If any of these fit you and the return already went out without them, an amended return is the fix, not a lost year.

The bottom line

Pay by April 15 even if you extend, make the Q1 payment, top up the IRA or HSA while it still counts for 2025, and check Schedule 1-A before you file.

If the new deductions make this year's return less obvious than usual, a free consultation is the surest way to maximize it.

References

1. IRS: 2026 filing season opens
2. IRS: About Form 4868, application for automatic extension for individuals
3. IRS: Estimated taxes
4. IRS: IRA contribution limits
5. IRS Publication 969: health savings accounts
6. AZDOR: making payments, late payments, and filing extensions
7. IRS: Schedule 1-A for the new deductions
8. IRS: tax deductions for working Americans and seniors

What is due

• Form 1120-S: the S-corp return, with a Schedule K-1 to each shareholder.[1]
• Form 1065: the partnership return, with a K-1 to each partner.[2]
• Form 2553: the last day to elect S-corp status for 2026, if you meant to and have not.[3]

The date is the 16th this year because March 15 lands on a Sunday, and deadlines that fall on a weekend roll to the next business day.[1]

A late business return delays every owner

The K-1 tells each owner their share of the profit, and no owner can file a personal return without it. When the business return runs late, every shareholder or partner waits with it, which is why this deadline sits a month ahead of the personal one.

The penalty is per owner, per month

The late-filing penalty is $260 per owner for every month or part of a month the return is late, up to twelve months.[4] Three owners and three months late is $2,340, charged on a return that usually owes no tax itself.

Reasonable cause and first-time penalty relief exist, but the cheaper move is the next section.

The extension is free and automatic

Form 7004, filed by March 16, moves the deadline to September 15 with no questions asked.[5] It extends the paperwork rather than any tax owed, and most pass-throughs owe no federal tax at the business level anyway.

So if the books are not ready, extend. The penalty math above is the price of skipping a free form.

Last call for the 2026 S-corp election

The January checklist and the myths post both pointed at this date: Form 2553 is due March 16 for the election to count for 2026.[3] Miss it and the election generally waits for 2027, unless you can prove reasonable cause for a late one.

The bottom line

File by March 16, or spend five minutes on the free extension, and get the K-1s out either way. If you are not sure the books can close in time, a free consultation this week costs less than a penalty next month.

References

1. IRS: Instructions for Form 1120-S
2. IRS: Instructions for Form 1065
3. IRS: Instructions for Form 2553, election by a small business corporation
4. IRS: Failure to file penalty, S corporations and partnerships
5. IRS: About Form 7004, application for automatic extension

With 2025 returns being prepared now, here are the twelve categories worth checking before you file, ranked by what they are usually worth.

1. Equipment and tools

This category covers anything from a framing nailer to an excavator. Small tools are deducted in the year you buy them, and under the rules that took effect in 2025, most larger equipment can also be written off in full in the year it starts working.[1]

The deduction belongs to the year the equipment was placed in service, not the year you ordered or paid for it.[1] A machine bought in December but first used in January goes on next year's return, and the year-end checklist covers using that timing on purpose.

Keep for each purchase

• The invoice, since a card statement shows the amount but not the equipment
• The date it was placed in service
• The loan documents, if financed
• A note of any personal use

2. Vehicle expenses

Trucks and vans are among the largest deductions in the trade and the most under-documented. You can deduct either the standard rate, 70 cents a mile for 2025,[2] or your actual costs of fuel, repairs, insurance, and depreciation, and both methods require records.[3]

Trips between job sites and supply runs count, while the commute from home generally does not.[3] Logging as you go beats reconstructing a year from memory in April, and today is the cheapest day to start.

3. Contractor and subcontractor wages

Payments to subs are deductible, and the paperwork is where the trouble hides. Paying an unincorporated sub $600 or more in 2025 means a 1099-NEC was due by the January deadline, and issuing one requires a signed W-9 on file.[4]

Collect the W-9 before the first check goes out, not in January, when the sub has stopped answering the phone.

4. Safety gear and work clothing

Hard hats, boots, gloves, high-visibility vests, respirators, fall protection, and branded work clothing are all deductible. The test for clothing is that it is required for the work and unsuitable for everyday wear: steel-toe boots pass, weekend jeans do not.

5. Business insurance

General liability, workers compensation, commercial auto, tools coverage, and builder's risk premiums are all deductible.[5] Premiums count toward the year the coverage applies to, which matters when a policy paid up front spans two tax years.

6. Interest on equipment loans and credit cards

The interest on equipment loans and the business share of credit card interest are deductible, and both are easy to miss because the statements only total them once a year.[5] Personal card interest never qualifies, which is one more reason the business runs on its own card.

7. Yard, storage, and equipment lot rent

Rent for any space the business uses is deductible: the equipment yard, the storage units holding materials between jobs, the shop where the trucks park.[5] Owners tend to catch office rent and miss the gravel lot.

8. Estimating, takeoff, and project management software

The subscriptions that run the business count, from estimating and takeoff tools to scheduling and project management platforms. They are small monthly charges that add up to a real number across a year, and they auto-renew and are easy to forget at tax time.

9. Permits, licensing, and bonding

Building permits, contractor license renewals, and the premiums on license and performance bonds are the costs of being allowed to do the work, and all of them are deductible.[5] In Arizona that includes the Registrar of Contractors renewal.

10. The business-use portion of your cell phone

The phone that handles bids, scheduling, and photos of finished work is a business tool, and the business share of the bill is deductible.[5] Estimate the split honestly and write the percentage down once; a documented estimate beats claiming nothing.

11. Job site cleanup and dump fees

Dumpster rentals, landfill fees, and haul-off charges are deductible, and they are the most cash-paid expenses in the trade, which is exactly how they disappear. Ask for the receipt at the scale, and photograph it before it fades or gets lost.

12. Trade association dues and continuing education

Dues to trade associations and the cost of continuing education, safety certifications included, are deductible when they maintain or improve the skills the business runs on.[5] Association dues qualify, but dues to clubs organized for recreation, the golf membership among them, do not.[5]

The bottom line

If your records live across receipts, job folders, and the glovebox, that is normal for the trade and it is fixable. Reconstructing the year and categorizing it correctly is what catch-up bookkeeping is for, and it is usually worth several times what it costs.

This is general information rather than advice for your specific situation, and the limits change year to year, so check the current figures before you file.

References

1. IRS Publication 946: how to depreciate property
2. IRS Notice 2025-5: 2025 standard mileage rates
3. IRS Publication 463: travel and car expenses
4. IRS: About Form W-9
5. IRS Publication 334: tax guide for small business

1. Get W-2s and 1099s out by January 31

Two forms are due by January 31, which this year means February 2 because the 31st lands on a Saturday:

• W-2s, one to each employee and one set to the Social Security Administration
• 1099-NECs, one to each unincorporated contractor you paid $600 or more in 2025, with a copy to the IRS

There is no automatic extension for either.[1]

Filing late costs $60 per form within the first 30 days, $130 until August, and $340 after that. A single missing 1099 can also be penalized twice, once for the copy the IRS never received and once for the copy the contractor never received.[1] The usual blocker is missing W-9s, which is why we push collecting them before the first check goes out.

One change to note for next January: for payments made in 2026, the 1099 threshold rises from $600 to $2,000.[1]

2. Make the final estimated payment by January 15

The fourth-quarter estimated payment for 2025 is due January 15, and it is the last payment that counts toward your safe harbor, the rule that protects you from underpayment penalties.[2] The year-end checklist explains the safe harbor in two paragraphs.

3. Renew the TPT license before penalties start

Arizona TPT licenses came due January 1, and late fees start after January 31. Renewal takes minutes on AZTaxes.gov, so do it before the deadline gets close.

4. Start this year's mileage log now

Mileage is deductible only if it is logged, and a log started in January covers every business mile the year produces. The 2026 rate is 72.5 cents a mile, up from 70 last year.[3] Receipts work the same way: one folder for 2026, photographed as they happen.

5. Use the windows that are open now

The S-corp election window for 2026 is open now and closes March 15, and the myths post covers why that date matters more than most owners expect. If you would rather be reminded than remember, the monthly newsletter flags each deadline as it approaches. January is also the cheapest month to fix messy books, because the pile only grows from here, and catch-up bookkeeping is priced by the size of the pile.

The bottom line

Send the forms, make the payment, renew the license, and start the log. The rest of 2026 inherits a clean foundation.

References

1. IRS: Information return penalties
2. IRS: Estimated taxes for small businesses
3. IRS: 2026 standard mileage rate of 72.5 cents per mile

The profit and loss statement

The P&L is the scorecard: revenue at the top, costs subtracted, profit at the bottom, always for a period of time like a month or a year. Each month, compare revenue to the same month last year, watch whether any expense category is growing faster than revenue, and check that the bottom line is consistently positive.

One thing to know before comparing reports: the numbers depend on your accounting method. Cash basis counts income when the money arrives, while accrual counts it when you earn it, invoice paid or not.[1] Most small businesses run on cash basis, but software can display either, so two people can pull the same month and argue over different numbers.

Why your profit and your bank account disagree

This is the most common question we get about reports: the P&L says the business earned money, but the account does not show it.

The culprits are transactions that look like expenses but are not:

• Loan principal: only the interest is an expense, so the rest of every loan payment leaves the bank without touching the P&L.[2]
• Credit card payments: the expense was recorded when you swiped, so paying down the card is moving debt, not new spending.
• Owner draws: money you pay yourself out of profits lowers cash, never profit.
• Equipment: large purchases usually become assets that deduct over time instead of hitting the P&L the day you pay.
• Inventory: stock is an asset until it sells, so a big buy ties up cash long before it becomes cost of goods sold.[2]
• Tax money passing through: sales tax you collected and payroll taxes you withheld were never yours, so sending them on is not an expense.
• Your own income taxes: for most small business structures, estimated tax payments are personal rather than a business expense.[2]

A profitable year with an empty account is rarely a mystery; the money usually went to one of these.

The balance sheet

The balance sheet is a photo of one day: what the business owns, what it owes, and what is left over for you.

It is also the report accountants read first, because bookkeeping errors surface here before anywhere else. The warning signs:

• A negative loan balance: payments kept posting after the loan was paid off, or principal and interest got mixed up.
• Undeposited funds piling up: income was recorded but never matched to a real bank deposit.
• Receivables that never move: either clients are not paying, or their payments were recorded without clearing the invoice.

When the balance sheet is wrong, every other report inherits the problem, because they are all built from the same books.

The cash flow statement

The cash flow statement answers the question the P&L cannot: where the money actually went. It sorts the year into three lanes:

• Operating: cash from the everyday business of selling and paying bills.
• Investing: equipment and other large purchases.
• Financing: loans coming in, loan payments going out, and owner draws.

A small cash-basis business can read most of this from the bank account, and the statement earns its keep as you grow, carry inventory, or take on debt.

The monthly check

1. Reconcile bank and credit card accounts, since nothing below can be trusted until the books match the bank
2. Scan the balance sheet for the warning signs above
3. Compare revenue against last month, and against the same month last year
4. Check that gross margin is holding steady
5. Flag any expense category growing faster than revenue
6. Review receivables aging: who is past 30, 60, and 90 days
7. Review payables due in the next 30 days
8. Compare cash on hand against next month's payroll, rent, and taxes

The bottom line

You do not need to love these reports; you only need the monthly check, which catches most problems while they are still small and cheap to fix.

If you would like a guided read of your own reports, that conversation is free.

References

1. IRS Publication 538: accounting periods and methods
2. IRS Publication 334: tax guide for small business

1. "Cash in the bank means the business is fine"

Your bank balance misleads for one simple reason: some of that money was never yours.

The sales tax you collected and the payroll taxes you withheld from paychecks both sit in your account looking like yours until the day they are due.

Withheld payroll taxes are the serious case. The law calls them trust fund taxes, and if they go unpaid, the IRS can collect the full amount from the responsible person directly rather than from the business.[1] An LLC does not block it.

The real number is your balance minus everything already spoken for, and doing that subtraction is what books are for.

2. "My business is too small for an accountant"

The biggest tax decisions arrive when the business is smallest.

The clearest example is the S-corp election, which can meaningfully cut self-employment tax. For most businesses the deadline is March 15, only two and a half months into the year.[2] Miss it, and the savings wait until next year.

There is relief for late elections, but you have to prove reasonable cause, and "nobody told me" is an uncomfortable case to make. The monthly newsletter exists so nobody has to make it.

Small does not mean simple; it means every dollar of the mistake is yours.

3. "Bookkeeping and accounting are the same job"

Bookkeeping records what happened, while accounting decides what it means and what to do about it.

One catches the duplicate charge, and the other notices your margin slipped three points and asks why. You need both, and they are not the same skill.

4. "The software does it for me"

Software records a merchant, a date, and an amount, but it cannot see purpose.

The bank feed knows you spent $412 at Home Depot, but only you know whether that was jobsite materials or your own kitchen. That distinction is a judgment call, and judgment calls are exactly what an audit tests. We covered what happens without records last month.

QuickBooks is a good filing cabinet, and nobody expects a filing cabinet to do the accounting.

5. "I only need an accountant in the spring"

Filing a return reports the decisions you already made, but it cannot improve them.

The moves that actually lower the bill all have deadlines during the year: entity elections in March, estimated payments every quarter, equipment and retirement plans by December 31. The year-end checklist walks through the big ones.

An accountant in April can only report the year, while an accountant in October can still change it.

The bottom line

All five myths survive the same way: things looked fine, so nobody checked. Checking is cheap, and a consultation costs nothing.

References

1. IRS: Trust Fund Recovery Penalty
2. IRS: Instructions for Form 2553, election by a small business corporation

The real bill hides in your tax return, your audit exposure, and your calendar.

1. Your hour is the most expensive one in the building

Whatever an hour of your work is worth, that is what an hour of your bookkeeping costs, which makes it the priciest labor available for the job.

2. Deductions do not survive without records

Tax law is more forgiving of thin paperwork than people assume. Since 1930, courts have been allowed to estimate a deduction when the spending clearly happened but the records are imperfect.[1]

Congress then carved out exceptions, and they are precisely the ones a small business leans on: vehicles, travel, and meals. For those, the law demands records of:

1. The amount
2. The time and place
3. The business purpose
4. Who was involved

The record is the deduction; no record, no deduction.[2]

3. Sloppy books are a named penalty trigger

The IRS accuracy-related penalty adds 20 percent to whatever was underpaid. It applies to negligence, and the regulation defines negligence to include failure "to keep adequate books and records or to substantiate items properly."[3]

4. In an audit, deposits are income until you prove otherwise

When records cannot explain the accounts, the IRS reconstructs income from bank deposits, and the presumption runs against you: a deposit counts as income unless you can show it was a transfer, a loan, or a refund.[4]

The burden of proof is yours, and books are how you carry it; without them, moving your own money between your own accounts can read as revenue.

5. Blurred books erode your liability shield

An LLC protects you only while the business is genuinely separate from you. When courts set that protection aside and reach an owner personally, commingled finances are among the most cited reasons.[5]

Your books are the evidence the line existed. Nobody sets out to commingle; it happens one wrong card swipe at a time, which is why it goes unnoticed until someone is watching.

The bottom line

Cleanup always costs more than upkeep: a transaction recorded this month takes a minute, while the same transaction reconstructed next year is an investigation.

For some businesses DIY makes sense and is a legitimate answer. Just price it honestly: your hours, your deductions, your exposure.

Not sure where yours lands? A free consultation takes half an hour, and we will tell you honestly if you are fine as you are.

References

1. Cornell Law School: the Cohan rule
2. 26 U.S. Code 274(d): strict substantiation for vehicles, travel, and meals
3. 26 U.S. Code 6662: accuracy-related penalty, and 26 CFR 1.6662-3 defining negligence
4. Brown Tax: the bank deposits method of proving income
5. Wolters Kluwer: piercing the veil of small business, what LLC and corporation owners need to know

This year especially: Congress rewrote a chunk of the tax code in July,[1] several changes reach back to January, and last year’s checklist is out of date.

Here are five moves, in order of payoff.

1. Reconcile your books

Reconciling means matching your books against your bank and credit card statements, line by line. Books that look fine in September usually hide three problems:

1. Duplicate transactions from a bank-feed glitch
2. Deposits stuck in an undeposited-funds account
3. Owner draws recorded as business expenses

Each one misstates your income. Fix them this month, while you still remember what that $900 charge from February was. In March nobody remembers, and your accountant bills by the hour to find out.

Receipts are easier than most owners think: the IRS has accepted scanned and photographed receipts since 1997.[2]

So skip the paper pile: photograph each receipt, save it to a folder named for the year, and you are done.

2. Use the safe harbor on estimated taxes

The safe harbor is the rule that protects you from underpayment penalties. Pay in enough during the year and the IRS cannot penalize you, even if you owe more in April.[3]

Your withholding plus estimated payments need to cover one of these, whichever is smaller:

• 90 percent of what you will owe this year, or
• 100 percent of last year’s total tax (110 percent, if your adjusted gross income was over $150,000)

Having a great year? Matching last year’s tax is the easy play: completely legal, no forecasting required, and the catch-up happens in April with no penalty.

The penalty for underpaying runs about 7 percent right now, compounding daily, like taking out a 7 percent loan you never applied for.[3]

The third quarterly payment is due September 15, so this is the week to check.

3. Buying equipment? Write it off faster

July’s tax law made two changes for equipment buyers:[1]

• 100 percent bonus depreciation is back, permanently. Most equipment can now be deducted in full, in one year, instead of spread across many.
• The Section 179 deduction cap rose to $2.5 million.

The deduction lands in the year the equipment is placed in service, which is IRS language for the day it starts doing its job rather than the day you order it or pay for it.[4]

Each purchase gets one write-off, and the delivery date picks the year: a truck delivered and hauling on December 30 is deducted on your 2025 return, while the same truck delivered in January is deducted on your 2026 return instead. For any large purchase, the calendar is a tax tool.

One caution before December: a deduction returns cents on the dollar. If new equipment was already in the plan, accelerating it into December is smart. Buying things you do not need to save a quarter of what they cost is still buying things you do not need.

4. The Arizona homework

Arizona keeps things mercifully simple with its flat 2.5 percent income tax. Two items still need attention before December ends.

Renew your TPT license

Transaction privilege tax is Arizona’s version of sales tax. Technically it taxes the seller for the privilege of doing business here, not the buyer, which is why the license is yours to keep current.[5]

The license renews January 1, and after January 31 penalties start: cities charge a late fee equal to half their portion of the license cost.[5]

Renewal takes minutes on AZTaxes.gov, and it gets forgotten every year. Set a reminder for December.

Consider the pass-through entity election

S-corps and partnerships can elect to have the business itself pay the 2.5 percent Arizona tax.[6] That turns your state income tax into a federal business deduction, which matters if the federal cap on deducting state taxes is costing you money.

It needs lead time, because partners and shareholders must get written notice and 60 days to opt out, which makes this a fall decision rather than an April one.

5. Plan a December check-in

Everything above is adjustable in December and locked once you file.

Retirement accounts are the sharpest example. A solo 401(k) generally must exist by December 31 to count for 2025. A SEP-IRA can be opened as late as your filing deadline.[7] Choosing between them is a December conversation, not an April regret, and a free half-hour consultation is enough to settle it.

The bottom line

Reconcile while the details are fresh, pay to the safe harbor, time the big purchases, do the Arizona homework, and have the December conversation.

Most of it takes an afternoon, and you walk into tax season already knowing the answer.

References

1. BDO: One Big Beautiful Bill Act expands 100% depreciation and Section 179 (July 2025)
2. IRS Revenue Procedure 97-22: electronic record keeping
3. IRS: Underpayment of estimated tax by individuals penalty
4. IRS Publication 946: How to Depreciate Property
5. Arizona Department of Revenue: Renewing a TPT license
6. Arizona pass-through entity tax election overview
7. IRS: One-participant 401(k) plans