A personal service corporation is taxed as a C-corporation at the flat 21% federal rate, but the IRS layers on rules that don’t apply to other C-corps: a lower $150,000 threshold for the accumulated earnings tax, a bar on using passive losses to offset service income, a mandatory calendar tax year, and a special anti-abuse rule that lets the IRS reallocate income between the corporation and its owners. Because of those rules, most PSCs are run so that nearly all corporate income is paid out as wages to the owner-employees, leaving little or nothing to be taxed at the corporate level. Understanding how personal service corporations are taxed comes down to understanding why that strategy exists and where it can go wrong.
When a Corporation Is a PSC
PSC status is a federal tax classification, not a state-law label, and it applies automatically when two tests are met. There is no election in or out.
The function test asks what the corporation does. Substantially all of its activities must involve services in one of eight fields: health, law, engineering, architecture, accounting, actuarial science, performing arts, or consulting.1Office of the Law Revision Counsel. 26 USC 448 – Limitation on Use of Cash Method of Accounting IRS temporary regulations have read “substantially all” as 95% or more in the ownership-test context.2The CPA Journal Online. The Many Faces of a Personal Service Corporation
The ownership test asks who holds the stock. At least 95% of the stock by value must be held, directly or indirectly, by employees performing the qualifying services, retired employees who performed them, the estate of any such employee, or someone who acquired stock through such an employee’s death (limited to a two-year window).3Internal Revenue Service. IRS Notice CP224 – Tax Rules for Personal Service Corporations
Meet both tests and the PSC rules apply, whether the shareholders wanted that treatment or not.
The 21% Corporate Rate and Double Taxation
Every C-corporation, PSCs included, pays a flat 21% federal income tax on corporate taxable income.4Office of the Law Revision Counsel. 26 USC 11 – Tax Imposed The rate is the same one other C-corps pay, so the rate itself is no longer the disadvantage it was under the pre-2018 graduated system.
What still stings is the second layer. Anything the corporation keeps after paying the 21% tax gets taxed again when distributed as a dividend to shareholders. That double hit is the reason PSC planning revolves around driving corporate taxable income to zero through deductible compensation paid to the people doing the work.
The Accumulated Earnings Tax Hits PSCs Harder
The accumulated earnings tax is a 20% penalty on corporate profits kept inside the company beyond its reasonable business needs, sitting on top of the regular 21% tax.5Office of the Law Revision Counsel. 26 USC 531 – Imposition of Accumulated Earnings Tax Every C-corp faces it, but PSCs get a lower safe harbor. A regular C-corporation can hold $250,000 in accumulated earnings before the IRS starts asking questions. A PSC’s threshold is $150,000.6Office of the Law Revision Counsel. 26 USC 535 – Accumulated Taxable Income
Above that line, the corporation has to justify why the money wasn’t paid out. That’s a harder case for a service business than for a manufacturer that can point to plant, inventory, or equipment. Documented plans for specific purchases, expansion, or contractual obligations survive scrutiny; a general desire to keep cash on hand usually does not.
Passive Activity Losses Can’t Offset Service Income
Under IRC Section 469, a PSC cannot use losses from passive activities to offset its active service income.7Office of the Law Revision Counsel. 26 USC 469 – Passive Activity Losses and Credits Limited If the corporation owns rental real estate or a passive investment that throws off losses, those losses are suspended and can only offset future passive income or be freed up when the passive activity is sold.
Closely held C-corporations that are not PSCs get better treatment: they can use passive losses against active business income, though not against portfolio income like interest or dividends. PSCs get no such break. This is the trap that catches professionals who put rental property inside their practice corporation expecting depreciation to shelter fee income.
Calendar Year Required, Cash Method Allowed
A PSC must use a calendar tax year unless it can demonstrate a business purpose for a different period, and the IRS has been explicit that deferring income to shareholders is not a business purpose.8Office of the Law Revision Counsel. 26 USC 441 – Period for Computation of Taxable Income A Section 444 election can buy up to a three-month deferral, but it triggers deduction limitations under Section 280H that restrict how much compensation the PSC can deduct in the shorter initial period.9Office of the Law Revision Counsel. 26 USC 444 – Election of Taxable Year Other Than Required Taxable Year Most PSCs live on a calendar year rather than fight that math.
The offsetting good news: qualified PSCs are explicitly permitted to use the cash method of accounting. Section 448 generally forbids C-corporations from using cash-method accounting, but Section 448(b)(2) carves out qualified PSCs.1Office of the Law Revision Counsel. 26 USC 448 – Limitation on Use of Cash Method of Accounting Income is recognized when received, expenses when paid. For a practice with large accounts receivable, that timing flexibility is real money.
How Owner Compensation Zeroes Out Corporate Tax
The core PSC strategy is simple. Pay out nearly all corporate net income as W-2 wages to the owner-employees. Wages are deductible, so corporate taxable income drops toward zero, which sidesteps both the 21% corporate tax and the accumulated earnings tax. The income shows up on the owners’ individual returns and is taxed at their personal rates. In practice, this makes the PSC behave a lot like a pass-through, even though it isn’t one.
The price of admission is payroll tax on all of that compensation: the employer’s 6.2% Social Security share up to the wage base, 1.45% Medicare with no cap, and the 0.9% additional Medicare tax on high earners.
Compensation Has to Be Reasonable
Wages must be reasonable for the services actually performed. The IRS looks at the employee’s training and experience, their duties and hours, what comparable practices pay for similar work, the corporation’s dividend history, and what non-shareholder employees make. Too little compensation invites the accumulated earnings tax. Too much invites the IRS to disallow part of the deduction. Keep the workpapers that show how the number was set.
The Section 269A Anti-Abuse Rule
If a PSC performs substantially all of its services for a single client and the principal purpose of the corporate structure is to avoid federal income tax by reducing an owner-employee’s income or securing deductions that wouldn’t otherwise be available, the IRS can reallocate income and deductions between the corporation and its owners.10Office of the Law Revision Counsel. 26 USC 269A – Personal Service Corporations Formed or Availed of to Avoid or Evade Income Tax This targets professionals who functionally work as one company’s employee but route pay through a PSC. If the structure lacks economic substance, the IRS can collapse it.
Where the C-Corporation Structure Actually Pays Off
Fringe Benefits
A C-corporation can deduct 100% of health and accident insurance premiums paid for its employees, including owner-employees, and those premiums are excluded from the employees’ taxable income. An S-corporation cannot offer the same deal to more-than-2% shareholders; the value of employer-paid coverage has to be included in their wages for income tax purposes, and they take a deduction on their individual return instead.11Internal Revenue Service. Publication 15-B (2026), Employers Tax Guide to Fringe Benefits
Beyond health premiums, C-corporations can also run medical and dental reimbursement plans for out-of-pocket costs, and can deduct group term life insurance up to $50,000 per employee with the coverage excluded from the employee’s income. For highly compensated professionals, these numbers add up. The condition is that benefit plans generally have to be nondiscriminatory, meaning coverage extends to rank-and-file staff, not just owners.
Retirement Plans
A PSC can sponsor a 401(k) or profit-sharing plan and deduct employer contributions, which is another way to move money out of corporate taxable income. For 2026, each participant can defer up to $24,500 of salary. Participants age 50 or older can add $8,000 in catch-up contributions, and those between ages 60 and 63 can make an enhanced catch-up of up to $11,250 instead of the standard $8,000. Total employer and employee contributions cannot exceed $72,000 per participant, before catch-up amounts. Nondiscrimination testing applies once the corporation has non-owner employees.
The QBI Deduction Isn’t Available
Income earned through any C-corporation, PSCs included, does not qualify for the Section 199A qualified business income deduction, which lets owners of sole proprietorships, partnerships, and S-corporations deduct up to 20% of qualified business income on their individual returns.12Internal Revenue Service. Qualified Business Income Deduction For a professional with $400,000 of business income, the difference between having and not having a 20% deduction is up to $80,000 of deductible income. QBI has its own limits for specified service trades or businesses at higher income levels, but C-corporation income is excluded outright.
Whether to Elect S-Corporation Status Instead
A PSC that meets the eligibility rules can elect S-corporation status by filing Form 2553, signed by every shareholder. An S-corp passes income through to the owners’ individual returns, which eliminates the corporate-level tax and neutralizes the accumulated earnings tax and the PSC passive loss rules.13Internal Revenue Service. S Corporations It also opens the door to the QBI deduction and allows owners to split pay between reasonable salary (subject to payroll tax) and distributions (not subject to self-employment tax). For a professional whose services drive the revenue, the IRS expects the salary side of that split to be substantial.
Eligibility requires a domestic corporation, no more than 100 shareholders (individuals, certain trusts, or estates), and a single class of stock.13Internal Revenue Service. S Corporations The cost of the election is losing the C-corporation fringe benefit treatment. For a physician or attorney whose practice pays $30,000 or more a year in owner health-related benefits, the lost exclusion can wipe out a large piece of the S-corp tax savings. Running both scenarios with real compensation and benefit numbers is the only way to know which structure produces the lower total tax.