Federal tax audits or examinations don’t just happen to big corporations. Founders and small businesses are often hit the hardest. This is sometimes because growth outpaces compliance, and sometimes because the rules themselves are complex. Here are some key areas where trouble tends to strike, and what you can do to mitigate risk.

1. Worker Classification: Independent Contractors vs. Employees

Issue: Misclassifying workers can lead to payroll tax assessments, penalties, and even personal liability for owners.

Consider: The IRS applies a multi-factor test focused on control. If you dictate hours, tools, and how the work is done, odds are the worker is an employee.

Action: Use written contracts with contractors. Review relationships annually. Consider preparing and filing IRS Form SS-8 if classification is unclear.

2. Payroll Tax Compliance

Issue: The IRS treats unpaid payroll taxes as one of the most serious violations. Missed deposits, late filings (Form 940 and Form 941), or failure to remit tax withholdings can trigger the Trust Fund Recovery Penalty (TFRP). Under the TFRP, the IRS can collect directly from “responsible persons”—owners, officers, or even bookkeepers.

Consider: Red flags like:

• Borrowing from payroll tax withholdings to cover operating expenses.
• Repeated late deposits.
• Incomplete or inaccurate Forms 940 or Forms 941.

Action: Use an outside payroll provider if you don’t have in-house talent. Always confirm deposits are made, even if a third-party processor is used.

3. Deductibility of Expenses

Issue: The IRS often challenges whether claimed deductions are truly “ordinary and necessary” under IRC § 162. Startups and entrepreneurs are particularly at risk because personal and business expenses sometimes blur together.

Consider:

• Startup vs. operating expenses: Generally, pre-opening costs must be capitalized and amortized under IRC § 195. There is a limited first-year immediate deduction of $5,000 in startup costs and another $5,000 in organizational costs. But this deduction is subject to limitations and phase-out.
• Meals, travel, and vehicles: Require strict substantiation with logs and receipts. Note applicable limitations like 50% of meals. Identify clear business purpose.
• Home office deductions: Often challenged unless the space is used exclusively and regularly for business. Evaluate applicable safe harbor rules and remember deduction recapture rules on sale of your home.

Action: Keep meticulous records. A clean ledger with contemporaneous notes, mileage logs, and calendar entries are key in audit defense.

4. Entity Structure & Elections

Issue: The choice of entity—and whether elections are properly filed—drives tax mechanics and impact, reporting compliance, and controversy.

Consider:

• Entity Classification Election (Form 8832): What is the default tax classification of the entity? Is the entity eligible to elect a different tax classification? Options are: association taxable as a corporation, partnership, or entity disregarded from its owner for federal income tax purposes. A late or erroneous election can have significant consequences. These mistakes can impact applicable tax mechanics and rate(s) and reporting obligations. Often, an election mistake leads to other incorrect or missed filings and more tax, interest and penalties.
• S Corporation Election (Form 2553): If filed late or incorrectly, the IRS treats the company as a C corporation. This creates unintended double taxation. As above, impacts can also include other incorrect or missed filings, more tax, interest and penalties.
• Reasonable Compensation: S Corp shareholders who underpay themselves and take most income as “distributions” risk IRS reclassification. This reclassification often triggers more payroll tax liabilities.
• Conversions and Reorganizations: Changing from an LLC with partnership or disregarded entity tax classification to a corporation (or vice versa) can trigger unanticipated tax consequences. As before, this often leads to more tax, interest, and penalties if not carefully planned.

Action: Confirm your entity elections are on time, appropriate, and as intended. Keep written records of salary determinations and supporting research. Consult tax counsel before making any structural changes or elections.

5. Qualified Business Income (QBI) Deduction (IRC § 199A) Complexities

Issue: The 20% deduction can be huge—but the rules are highly technical. The IRS closely examines whether a business is a “specified service trade or business” (SSTB), how wages are calculated, and whether property is properly classified.

Consider:

• Is your business type listed as a SSTB?
• How are wages and property allocated?
• Do income thresholds limit your deduction?

Action: Model the deduction annually to confirm eligibility, and document how wages and property are allocated. Careful planning around compensation, entity choice, and property ownership can preserve or improve the benefit.

6. Sale, Exit & Mixed-Character Transactions

Issue: When it’s time to sell, how you structure the deal often impacts whether proceeds are taxed as ordinary income or capital gain.

Consider: Impact to character (ordinary or capital gain) of gain, tax rate, and timing from:

• Stock / equity sale (legal) treated the same for tax purposes,
• Asset sale (legal) treated the same for tax purposes OR Stock / equity sale (legal) treated as an asset sale for tax purposes (available elections / requirements)
  • Allocation of purchase price to asset classifications (e.g., accounts receivable, inventory, goodwill, etc.)
• Installment sale treatment
• Foreign Investment in Real Property Tax Act (FIRPTA) for foreign investors selling an interest real property or a real-property rich entity.

Action: Get tax advice before signing the letter of intent. Once the framework structure is agreed upon, the tax impact of the final deal is often limited unless flexibility was built in.

7. Recordkeeping & Documentation – IRS Audit

Issue: The IRS doesn’t always take your books at face value. If records are thin, the IRS can use indirect methods to recreate your P&L. This can include bank deposit analysis, percentage markup analysis, or lifestyle audits (looking at cash and credit card expenditures and assets).

Consider / Action: Keep separate business and personal accounts and reconcile monthly. Save receipts and invoices. Prepare clear schedules for deductions. Save other relevant supporting documentation from third parties.

8. Penalties & Interest

Issue: The tax bill is only part of the pain. Late filing, late payment, and accuracy-related penalties can quickly snowball.

Consider:

• IRC § 6651 penalties for failure to file/pay.
• IRC § 6662 accuracy-related penalties for negligence or substantial understatement.
• Other IRC provisions imposing penalties for failure to file related to certain informational returns.

Action: Keep a tax compliance calendar with entries and recurring reminders for all tax filing and payment due dates and amounts. Task a responsible employee (or a third-party consultant) with monitoring and managing all tax obligations to ensure timely reporting and payment.

Final Word

For entrepreneurs and small businesses, tax controversies often arise not from intent but from oversight, rapid growth, or technical missteps. Minding entity classification elections and payroll tax obligations, documenting deductions, and involving tax counsel early in transaction planning, can help small businesses avoid many of the most common IRS challenges.

Often a short consultation with a tax attorney can save you from years of penalties, interest, and costly disputes. If you’re facing an IRS notice of audit or examination, notice of proposed adjustment, or IRS collection action, don’t delay. Now is the time to contact tax counsel with experience in tax controversy matters. Prompt action with a tax attorney in your corner can improve results. Potential benefits can include avoiding or releasing tax liens and levies, reducing tax, interest and penalties, or settling tax debts for less than the amount owed.