Two S-Corp owners run comparable consulting businesses with comparable \$280,000 net income years. The first pays himself a \$30,000 W-2 salary and takes \$250,000 in distributions; the second pays himself \$120,000 in W-2 salary and takes \$160,000 in distributions. The IRS comes after the first one, not the second. The two owners have the same Form 1120-S, the same Schedule K-1 income, the same tax bracket, and effectively the same total cash. They differ only on a single dimension, the ratio of salary to distribution, and that ratio is the single most-examined number on a closely held S-Corp return.
The reasonable-compensation rule under IRC §1366 and §3121(d) requires S-Corp shareholder-employees who perform services for the corporation to take “reasonable compensation” for those services before any pass-through profit becomes a distribution. The rule has been on the books for decades, the IRS audit playbook is documented in IRS Fact Sheet FS-2008-25, and the canonical case law, Watson v. Commissioner, T.C. Memo 2012-176, establishes the framework. Most S-Corp tax content describes this rule in terms that are too vague to be useful (“pay yourself a reasonable salary”). The actual examination question runs through three specific numbers the IRS asks about every audited S-Corp. This article walks each of them.
Why this number gets audited so often
The S-Corp tax structure is built around a single advantage: pass-through income avoids the 15.3% self-employment tax (FICA + Medicare) that a sole proprietor pays on every dollar of Schedule C net income. The shareholder-employee pays employment taxes on the W-2 salary portion; the remaining net income flows through Schedule K-1 as ordinary income subject to regular income tax but not to FICA. For an owner making \$280K, the difference between paying \$30K of salary versus \$120K of salary translates to roughly \$13,000-\$14,000 in annual FICA savings, every year, compounding.
This is also exactly why the IRS audits it. The agency knows the incentive structure and the Watson case (where the District Court upheld an IRS reclassification of \$175,000 of distributions to wages) established that re-characterization is procedurally available. The audit triggers are pattern-based: shareholder-employees with significantly below-market W-2 salaries combined with large distribution checks, particularly in service businesses where the owner’s labor is clearly the income-generating activity. The IRS Reasonable Compensation analysis under IRM 4.23 and the supporting case law generally treats “shareholder-employee took distributions without taking a reasonable salary first” as the canonical exam issue.
The first number, replacement cost
The first number the IRS examines is what the corporation would pay a comparably qualified non-owner employee to perform the same services. This is the “what it would cost to replace the owner” framing. For a consulting firm with one owner who does substantially all the consulting work, the question is: what does the labor market pay a senior consultant with the owner’s specific experience, credentials, and book of business management?
The market data sources the IRS accepts include Bureau of Labor Statistics Occupational Employment Statistics, RMA Annual Statement Studies, salary surveys from professional associations (AICPA for CPAs, NAEA for EAs, ABA for attorneys), and case-specific evidence from comparable hires in the same geographic market. Watson used Risk Management Association data and IRS expert testimony; the court accepted the IRS’s market-rate calculation over the taxpayer’s lower self-determined number. The lesson: the corporation’s W-2 salary should be defensible against a documented external benchmark, not against the owner’s preference for distribution treatment.
The second number, hours and role
The second number is the share of the owner’s total time and authority that’s allocable to compensable services versus to capital management or passive ownership. An owner who works 50 hours a week running consulting engagements is in a different position than an owner who works 5 hours a week strategically and delegates everything else. The compensable-services share is the multiplier on the replacement-cost number.
IRS Fact Sheet FS-2008-25 lists nine factors the IRS weighs in this analysis: the role and responsibilities in the business, the owner’s qualifications and experience, the compensation arrangement compared with the corporation’s gross and net income, the prevailing compensation rate at comparable businesses, payment of similar amounts to non-shareholder employees, payment of dividends compared to retained earnings, the timing and structure of compensation payments, and what comparable businesses pay for similar services. The factors are not mechanical, but the pattern matters: an owner whose role and time investment clearly supports the corporation’s gross revenue cannot defensibly pay themselves below the lower end of the market range.
The third number, the ratio
The third number is the salary-to-distribution ratio itself. There is no statutory bright-line rule that says “pay X% of distributable income as salary,” but the case law and IRS examination patterns establish ranges that are defensible and ranges that are not. Industry benchmarks vary, high-margin service businesses can defensibly run at 30-50% salary share of total compensation; capital-intensive businesses can run lower; pure investment management often runs higher.
The audit-trigger pattern is the extreme end: salary-to-distribution ratios below 15% in service businesses, salary-to-net-income ratios below 25%, or zero-salary years where the owner clearly performed services. Watson‘s salary-to-distribution ratio was approximately \$24K salary on \$200K+ in distributions and \$200K+ in gross corporate income, roughly 10% salary share, and the court found that pattern indefensible. Patterns above the Watson threshold are not automatically safe, but they are not automatically targeted either. The defensibility question is always specific to the role, hours, and market rate for the owner’s actual services.
What the audit defense actually looks like
When the IRS opens a reasonable-compensation examination, the auditor requests Form 1120-S filings, Schedule K-1s, W-2s issued to the shareholder, payroll-tax filings (Forms 941, 940), and supporting documentation for the salary determination. The defense rests on whatever contemporaneous analysis the corporation maintained: market-rate documentation, hours logs, role descriptions, comparable-employee compensation if applicable. A defense assembled at exam time, two or three years after the salary year, rarely produces the same outcome as a defense assembled at filing time.
The downside math is concrete. Watson‘s reclassification was approximately \$175,000 of distributions converted to wages over two tax years; the resulting employment-tax assessment, combined with §6651 failure-to-deposit penalties and §6601 interest, ran into low-to-mid-five-figures of additional cost beyond what the corporation would have paid had the salary been set defensibly from the start. The pattern is consistent across reported reasonable-compensation cases: the IRS adjustment is generally not catastrophic in absolute dollars, but it routinely costs 1.5x to 2x what the original FICA savings were, and that’s before factoring in the legal and accounting time the defense itself consumes.
The reconstruction cost is the other side. A salary determination memo, drafted at the beginning of each year, citing market data, describing the owner’s role and hours, and signed by the corporation’s board (formal or informal), takes about an hour to produce in real time. The same documentation reconstructed during an exam takes weeks, faces credibility challenges because it was assembled in response to the audit rather than at the decision point, and generally produces a less defensible position. The simplest fix to the reasonable-compensation problem is operational discipline rather than aggressive structuring.
What to do this year
Three actions matter, in order.
First, document the salary determination contemporaneously. A one-page memo at the start of each tax year, identifying the market data source, the owner’s role and hours, and the resulting reasonable-salary number, is the most consequential single document an S-Corp produces from a tax-defense standpoint. Many owners file the corporation’s payroll without doing this; the omission is also the most fixable defense gap, because the underlying analysis only takes an hour.
Second, pay the salary through actual payroll, not by reclassifying year-end distributions to wages on Form W-2. Payroll-tax timing matters, and Glass Blocks Unlimited v. Commissioner, T.C. Memo 2013-180, addressed the related re-characterization-of-distributions issue. The salary needs to be paid through quarterly payroll with timely Forms 941 deposits, not constructed after year-end through a single W-2 entry.
Third, calibrate the salary to the role’s defensibility, not to the FICA-savings target. Owners who optimize for the tax-savings number first and salary-defense second are the owners who get audited; owners who set the salary based on documented market rate first and accept the resulting FICA cost are the owners who do not. The reasoning is the same in both directions, the IRS audits the FICA-savings-optimized pattern because the pattern is visible on the return; the defensibility-first pattern is visible too, and is what the Watson court was looking for in the file.
Authority: IRC §1366 (S-Corp pass-through treatment of income); IRC §3121(d) (definition of “employee” for FICA purposes); IRC §3121(a) (wages subject to FICA); IRC §1361 (S-Corp election); Rev. Rul. 73-561 (early authority on disguised compensation in close corporations); IRS Fact Sheet FS-2008-25 (nine-factor reasonable-compensation analysis); IRM 4.23 (Employment Tax Examination Procedures); Watson v. Commissioner, T.C. Memo 2012-176, aff’d 668 F.3d 1008 (8th Cir. 2012) (canonical reasonable-comp case); Glass Blocks Unlimited v. Commissioner, T.C. Memo 2013-180 (re-characterization of distributions to wages); Form 1120-S (S-Corp return); Form 941 (quarterly employment-tax return); Form 940 (FUTA annual return); Schedule K-1 (Form 1120-S); Bureau of Labor Statistics Occupational Employment Statistics; RMA Annual Statement Studies.