The Business Tax Compliance and Audit Response Toolkit

Tax > Business and Self-Employment Tax | Published 25 February 2024 - Updated 1 February 2026 | UpLaw - uplaw.us

Business tax is won with habits and records. These are the habits and the records.

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Tool 1 — First ninety days setup sheet

Step	Detail	Done
Entity chosen for liability and tax		☐
Employer identification number obtained		☐
Business checking account opened		☐
⭐ Separate tax savings account opened		☐
Standing transfer set — ___% of every deposit		☐
Accounting method chosen — 26 U.S.C. § 446	☐ Cash ☐ Accrual	☐
Tax year chosen — 26 U.S.C. § 441		☐
Accounting software connected to bank feed		☐
Written accountable plan adopted		☐
Mileage log started	⚠ Today	☐
Qualified small business stock considered — 26 U.S.C. § 1202	⭐ Cannot be created retroactively	☐
Capital contributions documented — 26 U.S.C. § 351 / 26 U.S.C. § 721		☐
State withholding and unemployment registration (if hiring)		☐
Sales tax registration (if applicable)		☐
Local license / occupational tax		☐
All deadlines calendared		☐
October planning meeting scheduled	⭐	☐

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Tool 2 — Estimated payment worksheet

Item	Amount
Prior year total tax
⭐ Prior-year safe harbor target (statutory percentage of the above)
Current year projected profit
Projected self-employment tax — 26 U.S.C. § 1401
Projected income tax
Projected state tax
Total projected liability
Withholding from other sources (spouse's wages, pensions)
Required through estimated payments
Divided by four

Installment	Due	Amount paid	Date paid
1
2
3
4

☐ ⚠ The penalty under 26 U.S.C. § 6654 is computed period by period; a large January payment does not cure an April shortfall. ☐ ⭐ Withholding is treated as paid evenly across the year — increasing wage withholding late cures an earlier underpayment. ☐ Corporations: 26 U.S.C. § 6655. ☐ ⚠ An extension to file is not an extension to pay — 26 U.S.C. § 6151, 26 U.S.C. § 6081.

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Tool 3 — Entity comparison worksheet

Factor	Sole prop / SMLLC	Partnership	S corporation	C corporation
Projected profit
Employment tax on profit	⚠ Full	On general partners' shares	⭐ Wages only	Wages only
Estimated employment tax cost
Entity-level income tax	None	None	None	26 U.S.C. § 11
Second layer on distributions	No	No	No	⚠ Yes
Return required	Schedule	26 U.S.C. § 6031	26 U.S.C. § 6037	26 U.S.C. § 6012
Payroll administration cost	None	None	⚠ Required	Required
Preparation cost	Low	Higher	Higher	Highest
State entity/franchise tax
Basis tracking complexity	Low	⚠ High — 26 U.S.C. § 752	Moderate — 26 U.S.C. § 1368	N/A
Qualified small business stock possible	No	No	No	⭐ 26 U.S.C. § 1202
Net annual advantage

☐ ⭐ Rerun this annually. Profit changes the answer. ☐ S eligibility at 26 U.S.C. § 1361; election at 26 U.S.C. § 1362; built-in gains at 26 U.S.C. § 1374.

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Tool 4 — Reasonable compensation memorandum

⭐ The single most valuable document an S corporation owner can create. Write it every year, before the wages are set — not after an examination begins.

MEMORANDUM — Reasonable Compensation Determination Company: [name] · Owner-employee: [name] · Year: [ ] · Date prepared: [ ]

1. Duties performed. [Describe specifically: sales, production, management, administration. Estimate the percentage of time in each.]

2. Hours. Average hours per week: [ ]. Weeks per year: [ ].

3. Experience and qualifications. [Years in the field, credentials, specialized knowledge.]

4. Company financial data. Gross receipts: [ ]. Net profit before owner compensation: [ ]. Number of employees: [ ].

5. Comparable compensation data. [Source, geography, job title, and range. Cite the survey or listing used and attach it.]

Source	Position	Geography	Range

6. Replacement cost analysis. To replace the owner's services would require [number] persons at approximately [amount] each, totaling [amount].

7. Allocation. Of the owner's time, approximately [ ]% is attributable to services and [ ]% to capital or passive ownership functions.

8. Determination. Based on the foregoing, reasonable compensation for [year] is determined to be [amount], to be paid as W-2 wages. Distributions in excess of that amount reflect a return on invested capital and are not compensation for services.

9. Approval. Approved by [board/member consent] on [date].

☐ ⚠ Do not choose the number first and construct support afterward. ☐ Attach the comparable data actually consulted. ☐ Confirm wages are actually paid through payroll — 26 U.S.C. § 3402, 26 U.S.C. § 3111. ☐ ⭐ An adjustment carries employment tax plus interest and penalties for every open year. This memorandum is the defense.

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Tool 5 — Mileage log template

⭐ The most commonly disallowed deduction in small-business examinations, and the easiest to substantiate correctly.

Date	Starting point	Destination	Business purpose / who was met	Odometer start	Odometer end	Business miles

☐ Record at the time of the trip. ⚠ Reconstructed logs fare badly, and a reconstruction presented as contemporaneous is worse than no log. ☐ Record beginning and ending odometer readings for the year. ☐ Note total miles, business miles, and commuting miles separately. ⚠ Commuting is never deductible. ☐ Depreciation limits for passenger vehicles at 26 U.S.C. § 280F. ☐ Keep the log with fuel and maintenance receipts if using actual expenses.

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Tool 6 — Accountable plan

Free, simple, and routinely omitted. Without one, reimbursements become wages.

ACCOUNTABLE PLAN — [Company], adopted [date]

1. Business connection. The Company reimburses only expenses paid or incurred by an employee in connection with performing services for the Company.
2. Substantiation. The employee must submit, within 60 days of incurring the expense, documentation showing the amount, date, place, and business purpose, and for meals and travel, the business relationship of any persons entertained, as required by 26 U.S.C. § 274.
3. Return of excess. Any advance exceeding substantiated expenses must be returned within 120 days.
4. No wage reduction. Reimbursements are not paid in lieu of wages.
5. Treatment. Amounts reimbursed under this plan are excluded from wages and are not reported as compensation.

Adopted by [board/member consent].

☐ Use it for owner reimbursements as well as employees. ☐ ⭐ A home office used by an S corporation owner is frequently best handled as an accountable plan reimbursement rather than a personal deduction.

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Tool 7 — Payroll deposit calendar and controls

Control	Frequency	Owner	Done
Payroll processed	Each period		☐
Federal deposit made — 26 U.S.C. § 3402, 26 U.S.C. § 3111	Per schedule		☐
State withholding deposit	Per schedule		☐
Unemployment — 26 U.S.C. § 3301	Quarterly		☐
Quarterly employment return	Quarterly		☐
Annual wage statements — 26 U.S.C. § 6051	January		☐
Tip reporting — 26 U.S.C. § 6053	As applicable		☐
Deposit confirmations filed	Each deposit		☐

⚠ The absolute rule

If cash is short, pay the payroll taxes before rent, before the bank, before yourself.

Under 26 U.S.C. § 6672, any responsible person who willfully fails to pay over withheld taxes is personally liable. "Responsible" reaches anyone deciding which bills get paid. "Willful" means knowing the taxes were due and paying someone else. The liability survives dissolution and is not dischargeable in bankruptcy. Criminal exposure at 26 U.S.C. § 7202.

☐ Regulations at 26 C.F.R. part 31. ☐ See when a business cannot pay.

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Tool 8 — Substantiation matrix

What each deduction category actually requires, and when it must be created.

Deduction	Authority	Required documentation	Created when
General business expense	26 U.S.C. § 162	Receipt, purpose, payee	At payment
Meals	26 U.S.C. § 274	Amount, time, place, purpose, relationship	⭐ At the meal
Travel	26 U.S.C. § 274	Itinerary, purpose, receipts, allocation	At the trip
Vehicle	26 U.S.C. § 280F	⭐ Contemporaneous mileage log	At each trip
Home office	—	Photographs, measurements, exclusive-use evidence	At setup
Depreciation	26 U.S.C. § 167, 26 U.S.C. § 168	Invoice, in-service date, asset schedule	At acquisition
Section 179	26 U.S.C. § 179	Above, plus taxable income computation	At election
Inventory	26 U.S.C. § 471	Physical count, valuation method	Year end
Material participation	26 U.S.C. § 469	Hours log	Contemporaneously
Owner compensation	—	⭐ Reasonable compensation memorandum (Tool 4)	Before wages set
Related-party transactions	—	Written agreement, arm's-length pricing	At the transaction
Bad debt	—	Written instrument, collection efforts	At origination
Start-up costs	—	Separate tracking from operating costs	At incurrence
Charitable contribution	26 U.S.C. § 170	Acknowledgment letter	At contribution

☐ ⭐ Reconstruct nothing. The column that matters most is the last one. ☐ Retain through the assessment period at 26 U.S.C. § 6501, and longer for assets because basis matters at sale. ☐ Capitalization limits at 26 U.S.C. § 263.

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Tool 9 — Examination document response protocol

☐ Log the notice — date received, type, years, items selected, examiner name and contact. ☐ Calendar every stated date, twice. ☐ Engage representation before responding. ⚠ The preparer is not always the right person to defend the return. ☐ ⚠ Do not call the examiner informally. Everything said is a statement about the return.

Production protocol

Item requested	In our records?	Produce?	Notes
	☐	☐

☐ ⭐ Produce exactly what was asked and nothing more. Volunteering documents expands the examination. ☐ Reconcile before producing — know what the records show before the examiner does. ☐ Bates-number or index everything produced, and keep a copy set identical to what was delivered. ☐ ⚠ Never create a document that did not exist and present it as contemporaneous. ☐ Prepare a written narrative describing the business, its recordkeeping system, and any unusual items. ☐ Invoke 26 U.S.C. § 7605 if a second examination of the same year is proposed. ☐ Understand summons authority at 26 U.S.C. § 7602. ☐ ⚠ Assess criminal exposure first. 26 U.S.C. § 7525 does not apply in criminal matters — ⭐ where exposure exists, counsel should engage the accountant. See 26 U.S.C. § 7201, 26 U.S.C. § 7203, 26 U.S.C. § 7206.

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Tool 10 — Deficiency and appeal tracker

Event	Date	Deadline it starts	Calendared
Examination notice received		Response date	☐
Information document requests		Stated response dates	☐
Examination report issued		Appeals request window	☐
Appeals conference requested		—	☐
⚠ Notice of deficiency — 26 U.S.C. § 6212		⭐ Petition deadline — 26 U.S.C. § 6213; jurisdictional, cannot be extended	☐
Assessment — 26 U.S.C. § 6201		Collection notices	☐
Lien filed — 26 U.S.C. § 6321, 26 U.S.C. § 6323		Hearing request	☐
Levy notice — 26 U.S.C. § 6331		Hearing request	☐
Refund claim — 26 U.S.C. § 6511		Limitations	☐

☐ Check the assessment period at 26 U.S.C. § 6501; United States v. Home Concrete & Supply addressed the substantial-omission extension. ☐ ⚠ Think carefully before consenting to extend the assessment period. ☐ Exempt property from levy at 26 U.S.C. § 6334; procedures at 26 C.F.R. part 301 and 26 C.F.R. part 601. ☐ See responding to an IRS notice, audit, or collection action and the letter from the IRS.

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Tool 11 — Penalty abatement request

⭐ Reasonable cause is a real defense and is frequently not asserted.

[Date] — Internal Revenue Service

Re: Request for penalty abatement — [taxpayer], EIN [ ], tax period [ ]

The taxpayer requests abatement of the [failure to file / failure to pay / failure to deposit / accuracy-related] penalty assessed for the above period, on the following grounds:

1. Reasonable cause. [Describe the specific circumstances — serious illness, death in the immediate family, casualty, destruction of records, inability to obtain records, reliance on erroneous professional advice — with dates and supporting documentation attached.]

2. Ordinary business care and prudence. The taxpayer exercised ordinary business care and prudence in that [describe the compliance system in place, prior compliance history, and steps taken on discovering the problem].

3. Prompt correction. Upon learning of the issue on [date], the taxpayer [describe corrective action] and has since [describe current compliance].

4. Compliance history. The taxpayer has filed and paid timely for [period] preceding this event.

5. For accuracy-related penalties under 26 U.S.C. § 6662: the position taken had substantial authority and/or was based on reasonable reliance on professional advice, as follows: [describe].

Documentation is enclosed. Please advise if further information is needed.

[Name, title, contact]

☐ Late filing and payment penalties at 26 U.S.C. § 6651; entity late-filing at 26 U.S.C. § 6699; estimated tax at 26 U.S.C. § 6654 and 26 U.S.C. § 6655. ☐ ⚠ Reliance on a preparer is not automatically reasonable cause for failure to file or pay, though it can be for a substantive position. ☐ Attach documentation; assertions without support rarely succeed.

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Tool 12 — State nexus screen

Run before hiring in a new state, shipping into one at volume, or opening any location.

Question	State	Answer	Obligation created
Do we have an employee working here, even remotely?		☐	⚠ Payroll registration, withholding, unemployment
Do we have inventory stored here?		☐	Income tax and sales tax nexus
Do we have property or equipment here?		☐	Personal property tax rendition
Do sales into this state exceed the economic nexus threshold?		☐	Sales tax collection
Do we have contractors performing services here?		☐	Possible nexus
Are we registered here already?		☐	⚠ Filing continues until formal withdrawal
Is there a local gross receipts or occupational tax?		☐
Is there a franchise or entity tax owed in a loss year?		☐

☐ ⚠ Sales tax collected and not remitted is a trust fund obligation in most states, with personal liability parallel to 26 U.S.C. § 6672. ☐ ⚠ Do not register where there is no obligation. Registration creates ongoing filings and delinquency notices for years. ☐ See property tax assessment and appeals and appealing a property tax assessment and claiming exemptions.

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Tool 13 — October planning agenda

⭐ Hold this meeting every year, in October — while decisions can still be made.

Item	Analysis	Decision
Projected profit for the year
Projected total tax, federal and state
⭐ Does the tax savings account hold enough?
Estimated payments made to date; fourth installment amount
Cash-method timing: accelerate expenses? defer billing?
Equipment purchases — model against the 26 U.S.C. § 179 taxable income limit
⭐ Retirement plan — establish or fund? Which type? Deadline?
Reasonable compensation review for the year
Entity form still appropriate at this profit level?
Missing vendor identification numbers
Payroll deposits all current?
Basis sufficient to deduct projected losses?
Any related-party transactions needing documentation?
Next year's estimated payment safe harbor target

☐ ⚠ Never buy equipment primarily for the deduction. Spending a dollar to save a fraction of one is not a strategy. ☐ ⭐ The retirement plan line is usually the largest number on this page. See employee benefits and ERISA.

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Tool 14 — Sale or closure checklist

Step	Authority	Done
Purchase price allocation agreed and consistent between parties	26 U.S.C. § 1060	☐
Asset vs. stock structure modeled	26 U.S.C. § 1001	☐
Recapture computed	26 U.S.C. § 1245, 26 U.S.C. § 1250	☐
Character of gain determined	26 U.S.C. § 1231	☐
Intangibles amortization for buyer	26 U.S.C. § 197	☐
⭐ Qualified small business stock eligibility checked	26 U.S.C. § 1202	☐
Reorganization treatment considered	26 U.S.C. § 368, 26 U.S.C. § 355	☐
Liquidation treatment considered	26 U.S.C. § 336, 26 U.S.C. § 338	☐
Final payroll returns and deposits	⚠ 26 U.S.C. § 6672 survives closure	☐
Final information returns	26 U.S.C. § 6041, 26 U.S.C. § 6045	☐
State registrations formally withdrawn		☐
Records retained beyond the assessment period	26 U.S.C. § 6501	☐

☐ ⚠ A closed business still gets examined. Retain records. ☐ See owner disputes and business dissolution and resolving an owner dispute or dissolving a closely held business.

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Tool 15 — Routing table

If your situation is	Go to
Understanding why the first bill was a shock	The quarterly surprise
Working the full framework	Business and self-employment tax
Setting up or responding to an audit	Setting up business tax compliance and responding to an audit
Individual notices and collection	Tax controversy for individuals
Decoding a specific notice	The letter from the IRS
Responding to a notice or levy	Responding to an IRS notice, audit, or collection action
Individual controversy forms	The individual tax controversy toolkit
Entity choice and formation	Starting and running a small business
Formation steps	Forming and launching a small business
Contractor vs. employee	Worker classification
Challenging a classification	Assessing and challenging a worker classification
Wage and hour obligations	Wage and hour law
Retirement and benefit plans	Employee benefits and ERISA
Business personal property tax	Property tax assessment and appeals
The business cannot pay its debts	When a business cannot pay
Restructuring or filing	Business bankruptcy and restructuring
Owner disputes	Owner disputes and business dissolution
Contract questions	Contracts
Commercial lease obligations	Commercial leasing for small business

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Tool 16 — The card

1. Two accounts on day one: business checking and tax savings.
2. Transfer a fixed percentage of every deposit into the tax account, on receipt.
3. Use the prior-year safe harbor for estimated payments.
4. Start the mileage log today. It cannot be created later.
5. Reconcile the bank account monthly, forever.
6. Pay payroll taxes before rent, before the bank, before yourself.
7. If you elect S corporation status, write the compensation memo before setting wages.
8. Never commingle. A bank-deposits analysis is the penalty.
9. Hold the October planning meeting. Fund a retirement plan.
10. In an examination: engage representation, produce only what was asked, reconstruct nothing.

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Related Documents

• The Quarterly Surprise: How Business and Self-Employment Tax Actually Works
• Business and Self-Employment Tax: A Comprehensive Guide to Entities, Deductions, Payroll, and Audits
• Setting Up Business Tax Compliance and Responding to an Audit: A Practical Checklist