To calculate a profit-sharing bonus using the most common method, divide each employee’s gross annual pay by the total payroll of all eligible workers, then multiply that percentage by the bonus pool. If the pool is $250,000, total eligible payroll is $2,000,000, and an employee earns $80,000, their share is 4% of the pool, or $10,000. That is the arithmetic. What follows the arithmetic — the flat 22% federal withholding on cash bonuses, FICA, overtime recalculations for non-exempt staff, and separate caps if the money flows into a retirement plan — is where most of the work actually lives.
The Pro-Rata (Comp-to-Comp) Formula
The pro-rata method, sometimes called comp-to-comp, is the default at most companies. It runs in two steps.
- Divide the employee’s gross annual compensation by the total gross compensation of all eligible employees. That gives you their share as a percentage.
- Multiply that percentage by the total profit-sharing pool.
The result is proportional. Everyone gets the same percentage of their salary, so higher earners receive larger dollar amounts but no one receives a larger slice of their own pay than anyone else. A person on $40,000 and a person on $120,000 both walk away with a bonus worth the same fraction of what they earn.
One cap matters here if the plan is a qualified profit-sharing plan: for 2026, only the first $360,000 of any employee’s compensation can be counted in the ratio.1Internal Revenue Service. 2026 Amounts Relating to Retirement Plans and IRAs An executive earning $500,000 is treated as though they earn $360,000 when the shares are computed. The cap does not apply to direct cash bonuses paid outside a qualified plan.
The Fixed Dollar Method
The fixed dollar method ignores salary. Divide the pool by the number of eligible employees, and everyone receives the same check. A $150,000 pool split among 75 workers pays $2,000 to each of them, regardless of role or seniority.
This works when the company wants the bonus to feel like a shared result rather than a reflection of the pay hierarchy. It is also the lightest formula to administer: no payroll lookups, no ratios, no rounding fights. The trade-off is that a fixed dollar bonus lands as a smaller percentage of income for senior staff, which can blunt its motivational value at the top of the org chart.
New Comparability (Cross-Tested) Plans
New comparability lets an employer assign different contribution rates to different groups. An owner-heavy practice might contribute 15% of pay for partners and senior managers and 5% for everyone else. The IRS permits this, but only if the plan passes nondiscrimination testing, which converts each person’s contribution into a projected retirement benefit at age 65 and checks whether the projected benefits skew too heavily toward the highly compensated.
There is a gateway requirement: every eligible non-highly-compensated employee must receive at least the lesser of one-third of the highest contribution rate given to any highly compensated employee, or 5% of their pay. The testing math is complex enough that most employers using this formula pay a third-party administrator to run it. Getting the allocation wrong can disqualify the plan.
Tax Withholding When the Bonus Is Paid as Cash
Profit-sharing paid directly to employees is treated as supplemental wages under IRS rules, and the withholding does not follow the same math as a regular paycheck.
Federal Income Tax
Withhold a flat 22% for federal income tax on supplemental wages as long as the employee’s total supplemental pay for the calendar year stays at or below $1 million. The flat rate applies regardless of what the employee put on their W-4. Once supplemental wages exceed $1 million in the same calendar year, everything above that line is withheld at 37%.2Internal Revenue Service. Publication 15 (2026), Employers Tax Guide
The 22% is not the final tax. It is an advance estimate collected through withholding. The actual tax owed depends on the employee’s total income and bracket, which is why some people owe more on the bonus at tax time while others get a refund. Employees who see 22% taken out and assume that is what they owe are often reading the paystub incorrectly.
Social Security and Medicare
The bonus is subject to Social Security tax at 6.2% and Medicare tax at 1.45%, with the employer matching both.3Internal Revenue Service. Topic No. 751, Social Security and Medicare Withholding Rates Combined, that is a 15.3% FICA load on every bonus dollar between employer and employee.
Social Security stops once total wages for the year cross a ceiling. For 2026, that ceiling is $184,500.4Social Security Administration. Contribution and Benefit Base If an employee’s salary has already passed that number when the bonus lands, no Social Security tax comes out of the bonus. Medicare has no wage cap, so 1.45% applies to every dollar.
An additional 0.9% Medicare surtax applies to wages above $200,000 for single filers and $250,000 for joint filers.5Internal Revenue Service. Questions and Answers for the Additional Medicare Tax Employers must start withholding the extra amount once any single employee crosses $200,000 for the year, regardless of filing status. A large profit-sharing payment that pushes someone over $200,000 triggers the surtax on the dollars above the line.
State Withholding
Most states with an income tax also require withholding on supplemental wages. Rates run roughly from 1.5% to over 11%. Some states require the aggregate method, meaning the employer adds the bonus to the regular paycheck and withholds based on standard tax tables rather than applying a flat supplemental rate. States without an income tax require no supplemental withholding at all.
When the Bonus Goes Into a Retirement Plan Instead
If the profit-sharing allocation goes into a qualified retirement account rather than being paid as cash, different limits apply and the withholding rules above are irrelevant for the plan contribution itself.
For 2026, the total annual addition to any single employee’s defined contribution account cannot exceed $72,000.1Internal Revenue Service. 2026 Amounts Relating to Retirement Plans and IRAs That covers all employer contributions to the account for the year, including profit-sharing allocations and matching contributions. The $360,000 compensation cap mentioned earlier applies here as well.
On the employer side, total deductible profit-sharing contributions across all employees for the year cannot exceed 25% of the aggregate compensation paid to plan participants.6Office of the Law Revision Counsel. 26 U.S. Code 404 – Deduction for Contributions of an Employer Contributions above the cap can be carried forward and deducted in a later year, but they sit as non-deductible dollars in the meantime.
The Funding Deadline
An employer does not have to move the money into the plan before the tax year closes. A profit-sharing contribution counts as a deduction for the prior tax year as long as it reaches the plan by the due date of the employer’s return, including extensions.7Internal Revenue Service. Issue Snapshot – Deductibility of Employer Contributions Made After the End of the Tax Year For a calendar-year C corporation with an extension, that is typically mid-October of the following year. Missing the deadline pushes the deduction out an entire tax year.
Overtime Recalculation for Non-Exempt Employees
A profit-sharing bonus tied to a formula that employees know about in advance is a non-discretionary bonus under the Fair Labor Standards Act. Non-discretionary bonuses have to be folded into the regular rate of pay used to calculate overtime for non-exempt workers.8U.S. Department of Labor. Fact Sheet 56C: Bonuses Under the Fair Labor Standards Act
A profit-sharing formula announced at the start of the year fits that description: employees know it exists and can predict a payout if the company hits the target. Once the bonus is paid, the employer owes additional overtime compensation covering the overtime hours worked during the period the bonus applied to. Most companies handle it by recalculating overtime after the bonus period closes and issuing a small catch-up payment.
A truly discretionary bonus, where the employer decides the amount and timing with no prior formula or announcement, is excluded from the regular rate. Misclassifying a formula-based bonus as discretionary can create back-pay exposure for every non-exempt employee who worked overtime during the covered period.
Reporting the Bonus
Cash profit-sharing bonuses go through the normal payroll reporting channels. Withheld federal income tax, Social Security, and Medicare taxes are reported on Form 941, filed quarterly, alongside regular wages.9Internal Revenue Service. About Form 941, Employers Quarterly Federal Tax Return The bonus amount is also included in the employee’s year-end W-2 as part of total compensation. There is no separate bonus filing.
For qualified profit-sharing plans, the annual Form 5500 reports the plan’s financial condition, contributions made during the year, and the participant count.10Internal Revenue Service. Form 5500 Corner Plans with roughly 100 or more participants must also file Schedule H with detailed financials and an independent accountant’s report.11U.S. Department of Labor. Form 5500 Series Both the IRS and the Department of Labor review these filings, and penalties apply to late or inaccurate submissions.
Giving each employee a paystub that itemizes the bonus, the federal and state withholding, and the FICA deductions is standard practice even in states that do not require it. It heads off the most common source of complaints: the gap between the announced bonus and what actually shows up in the bank account.