Tax

5 Owner Compensation Mistakes That Trigger IRS Scrutiny

How you pay yourself decides how much tax you pay — and how much audit risk you carry. Here are the five owner-comp mistakes that cost owners the most.

By Aparna Devalla, CPA3 min · 6 slidesUpdated June 15, 2026

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Why Owner Comp Is High-Stakes

Owner compensation sits at the intersection of payroll tax, income tax, retirement planning, and entity-level audit risk.
S-corp owners must pay 'reasonable' salary before distributions; underpayment is the #1 IRS S-corp audit target.
Partnership owners take guaranteed payments and distributive shares with different tax treatments; misclassification hurts.
Sole proprietors and single-member LLCs face self-employment tax on everything — choosing whether to elect S-corp is the biggest planning decision.
Each of the five mistakes below has been the subject of IRS guidance, Tax Court cases, or large audit assessments. Avoiding them isn't optional planning — it's compliance.

Mistake 1: S-Corp Salary Set Too Low

An S-corp owner-employee performing skilled work who pays themselves $30K and takes $200K in distributions is a textbook audit case.
The IRS uses BLS wage data, industry surveys, and the owner's actual duties to establish reasonable comp. Underpayment gets reclassified as wages with back payroll tax + penalties.
Defensible documentation: annual reasonable-comp analysis with comparable wage data, written role description, hours worked, complexity of duties.
Rule of thumb: salary should be at least 30–50% of (salary + distribution) at high profit levels, with documentation supporting the specific number.

Mistake 2: Mixing Personal and Business Health Insurance

Health insurance rules differ by entity type. S-corp >2% shareholders must include health insurance in W-2 Box 1 wages, then deduct it on their personal return as a self-employed health insurance deduction.
C-corp owners can deduct health insurance fully at the corporate level (no W-2 inclusion needed).
Sole proprietors and partners use the self-employed health insurance deduction directly.
Mistake: S-corp owners running health insurance through the business but NOT including it on W-2. The IRS catches this on payroll-to-W-2 reconciliation.

Mistake 3: Owner Loans Without Documentation

Borrowing from the business 'temporarily' without a promissory note, interest, and repayment schedule is treated as a constructive distribution.
For S-corps, this can blow your basis and trigger taxable distributions in excess of basis.
For C-corps, the IRS treats undocumented loans as dividends — fully taxable to the owner with no deduction to the corp.
The Applicable Federal Rate (AFR) imputed interest rules apply to any loan over $10K. Below-market loans create imputed interest income for the lender.
Fix: written promissory note, market-rate interest (AFR), documented repayment schedule, actual payments per the schedule.

Mistake 4: Missing Retirement Contribution Limits

Solo 401(k) plans must be ESTABLISHED by December 31 to count for that tax year. Funding can be later (up to the extended return date), but the plan must exist.
Owners who try to retroactively set up a Solo 401(k) after January 1 find they've missed the prior year — and lose tens of thousands in tax-deferred savings.
SEP-IRAs are more flexible: they can be both established AND funded up to the extended return due date.
Defined benefit / cash balance plans for high-income solo owners can shelter $200K–$300K+, but require actuarial setup and ongoing administration. Worth it for the right facts.

Mistake 5: Skipping the Annual Comp Review

Owner comp set five years ago when profit was $200K may be wildly off now that profit is $800K. Salary that was reasonable then may be far too low now.
Annual review: project this year's profit, re-benchmark reasonable salary, optimize the salary/distribution mix, set retirement contribution targets, model self-employed health insurance.
Document the analysis. The documentation is what defends you on audit — the conclusion alone isn't enough.
Coordinate with personal tax projections — the right S-corp salary depends on your marginal personal rate and your spouse's W-2 income, not just business profit.
Need an owner comp review? Rubric Financial includes annual owner comp modeling and documentation in every tax engagement.

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