Year-End Bonus Tax Planning: Timing, Deductibility, and Payroll Tax Strategies

By Yarik Yarosh, CPA ·September 5, 2026 ·5 min read

Written by Yarik Yarosh, CPA (US & Canada) September 5, 2026 · FL CPA license AC61704 · CPA Ontario

Year-end bonuses are one of the most flexible tax planning tools for businesses with employees. A properly timed bonus can accelerate deductions into the current tax year, reward performance, and manage the employer’s taxable income. But the deduction timing rules are strict: for cash-basis businesses, the bonus must be paid by December 31 to be deducted in the current year. For accrual-basis businesses, the bonus must be accrued by year-end and paid within 2.5 months of the end of the tax year (by March 15 for calendar-year businesses). Related-party rules under IRC 267 and IRC 404(a)(5) add additional constraints for S-Corp shareholder-employees.

✓Key takeaway

Bonus tax planning rules:

Cash-basis businesses:

Bonuses are deductible when paid (constructively received by the employee)
To deduct in 2025, the bonus must be paid by December 31, 2025
A check dated December 31 but mailed January 2 may not qualify (the employee must receive it or have it available)
Direct deposit on December 31 is the cleanest method
Bonus payroll must be processed through regular payroll (subject to FICA, income tax withholding)

Accrual-basis businesses:

Bonuses can be accrued (deducted) in the current year and paid in the next year
The payment must occur within 2.5 months of the end of the tax year (March 15 for calendar-year businesses)
The liability must be fixed and determinable by year-end (amount, recipient, and obligation all established)
A bonus pool that requires future board approval or management discretion does not meet the “fixed and determinable” test

Related-party rule (IRC 267):

For related parties (S-Corp shareholder who owns more than 50%, family members of that shareholder), the deduction is allowed only when the payment is included in the recipient’s income
This means: for a cash-basis shareholder-employee, the bonus must be PAID (not just accrued) by the S-Corp’s year-end
An accrual-basis S-Corp cannot accrue a bonus to a >50% shareholder-employee and pay it March 15. The deduction is deferred until the shareholder actually receives the payment.

Payroll tax implications:

Bonuses are subject to Social Security tax (6.2% employer + 6.2% employee) until the wage base ($176,100 in 2025) is reached
If the employee has already exceeded the Social Security wage base from regular pay, no additional Social Security tax on the bonus
Medicare tax (1.45% employer + 1.45% employee) applies with no wage base cap
Additional Medicare Tax (0.9% employee only) applies on wages exceeding $200,000
Withholding: flat 22% federal income tax rate on supplemental wages up to $1 million (37% above $1 million)

How does bonus timing affect the tax picture?

Hypothetical example

Round numbers. For current guidance, see IRS Publication 334 (Tax Guide for Small Business). An S-Corp (accrual basis) has $400,000 in net income before bonuses. The sole shareholder-employee (owns 100%) earns a $100,000 salary and is considering a $50,000 year-end bonus. There are also 3 non-related employees eligible for bonuses totaling $30,000.

Shareholder-employee bonus ($50,000):

IRC 267 applies (>50% owner)
The bonus is deductible only when paid to the shareholder
If the S-Corp accrues $50,000 on December 31 but pays it February 15:
- IRC 267 defers the deduction to the year of payment, not the year of accrual
- The S-Corp cannot deduct the $50,000 until February 15 of the next year (when the shareholder includes it in income)
- This moves the deduction to the NEXT tax year
Solution: pay the shareholder’s bonus by December 31 (process through December payroll)
Payroll taxes on the bonus: $50,000 x 7.65% = $3,825 employer share + $3,825 employee share = $7,650 total FICA
But: the salary is already $100,000, so the Social Security portion ($6,200 each) is partially used. Only $76,100 remains before the $176,100 cap.

Non-related employee bonuses ($30,000 total):

IRC 267 does NOT apply (not related parties)
The S-Corp can accrue the $30,000 on December 31 and pay by March 15
Deduction: $30,000 in the current year
Payment: January or February of the next year
This gives the S-Corp a current-year deduction while preserving cash into January

Net income after bonuses:

Before bonuses: $400,000
Shareholder bonus (paid December): ($50,000)
Employee bonuses (accrued December): ($30,000)
Net income: $320,000
Tax savings from bonuses (24% bracket): $80,000 x 24% = $19,200
Payroll tax cost of bonuses: approximately $12,240
Net benefit: $6,960 plus employee retention value

Illustrative numbers only, not a real client and not advice for your facts.

What payroll tax obligations does an employer have?

Employers must withhold federal income tax, Social Security tax (6.2%), and Medicare tax (1.45%) from employee wages, then match the Social Security and Medicare portions from their own funds. The employer’s total payroll tax cost is at least 7.65% of wages on top of what the employee pays. Federal unemployment tax (FUTA) adds 6% on the first $7,000 of each employee’s wages, reduced to 0.6% in states with approved unemployment programs (most states). Payroll taxes must be deposited on a semi-weekly or monthly schedule depending on your total tax liability, and late deposits trigger escalating penalties (2% to 15%). Officers and other “responsible persons” who willfully fail to collect and remit payroll taxes face the trust fund recovery penalty (IRC 6672), which is 100% of the unpaid trust fund taxes and is assessed personally.

How does choosing the wrong entity structure affect my taxes?

The wrong entity can cost thousands in unnecessary taxes annually. A sole proprietor earning $120,000 pays roughly $17,000 in self-employment tax; an S-Corp paying a $70,000 reasonable salary saves approximately $7,650 in FICA on the remaining $50,000. Conversely, an S-Corp for a business earning $40,000 creates more compliance cost (payroll, separate return) than the FICA savings justify. A C-Corp creates double taxation on distributions unless the owner takes all profits as salary, which maximizes FICA. Switching later is possible but can trigger tax consequences: converting a C-Corp to an S-Corp subjects built-in gains to a 5-year recognition period.

Related guides:

Year-End Tax Planning for Small Business Owners: 15 Strategies to Reduce Your Tax Bill

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Cite this page

Yarik Yarosh, CPA. "Year-End Bonus Tax Planning: Timing, Deductibility, and Payroll Tax Strategies." Blue Cloud CPA, September 5, 2026. https://bluecloudcpa.com/guides/small-business-tax-planning-for-bonus-season

This guide is general information, not tax advice for your specific situation. Which points apply, and how, depends on your facts.