Quick Answer
Bonuses under $1 million use either the 22% flat percentage method or the aggregate method (combining bonus with regular pay). The percentage method is simpler but may under-withhold for high earners, while aggregate method often withholds more accurately but varies by timing.
Best Answer
Sarah Chen, CPA
Best for typical employees who receive occasional bonuses and want to understand their paystub
The two methods employers can choose
When you receive a bonus, your employer must choose between two IRS-approved withholding methods according to Publication 15. The method they choose affects how much tax is withheld, but not how much you actually owe at year-end.
Percentage method (22% flat rate)
Most employers use this simpler approach:
Aggregate method (combined withholding)
Some employers use this more complex calculation:
1. Add bonus amount to your most recent regular paycheck
2. Calculate total withholding on the combined amount
3. Subtract what would be withheld on regular pay alone
4. Withhold the difference on your bonus
Example: $5,000 bonus with $75,000 salary
Your regular biweekly pay: $2,885 (gross)
Regular withholding: ~$485 (16.8% effective rate)
Percentage method:
Aggregate method:
When aggregate method is used
Employers typically choose aggregate when:
Why 22% might feel wrong
The flat 22% rate often seems high because:
But 22% might actually be low if you're in the 24%, 32%, or higher tax brackets.
Impact on your tax refund
What you can't control vs. what you can
You can't control:
You can control:
Red flags to watch for
What you should do
1. Calculate your marginal tax rate using our [Paycheck Calculator](paycheck-calculator)
2. Compare to your bonus withholding rate to see if adjustment needed
3. If under-withheld: Increase W-4 withholding or make estimated payments
4. If over-withheld: Consider reducing other withholding to improve cash flow
Use our [W-4 Optimizer](w4-optimizer) to model different scenarios and optimize your year-end tax situation.
Key takeaway: The 22% percentage method is simpler but may under-withhold for high earners, while the aggregate method often withholds more accurately but creates variable take-home amounts depending on timing.
Key Takeaway: The 22% percentage method is simpler but may under-withhold for high earners, while the aggregate method typically withholds more accurately but varies by timing.
Comparison of bonus withholding methods for $5,000 bonus with $75,000 salary (biweekly pay)
| Method | Calculation | Federal Withholding | Take-Home Bonus* | Best For |
|---|---|---|---|---|
| Percentage (22%) | $5,000 × 22% | $1,100 | $3,615 | Simplicity, lower earners |
| Aggregate | Combined with regular pay | $1,615 | $3,100 | Accuracy, higher earners |
| Difference | - | +$515 more withheld | -$515 less cash | Depends on tax bracket |
More Perspectives
Marcus Rivera, CFP
For high-income employees who need to understand withholding accuracy and year-end tax planning
Why method choice matters more for high earners
As a high earner, the withholding method on your bonus significantly impacts your year-end tax situation. The 22% percentage method often under-withholds, while aggregate method provides more accurate withholding aligned with your actual tax bracket.
The under-withholding trap
If you're in the 24%, 32%, or 35% tax brackets, the 22% flat rate creates a systematic under-withholding problem:
Example: $200,000 salary + $50,000 bonus
Aggregate method advantage
The aggregate method better reflects your true tax situation:
Strategic considerations
Bonus timing impact on aggregate method:
Multiple bonus planning:
Estimated payment requirements
High earners with significant bonuses often need quarterly estimated payments regardless of method, especially if:
Use our [W-4 Optimizer](w4-optimizer) to model withholding scenarios and avoid penalties.
Key takeaway: High earners should prefer employers who use aggregate method or plan for quarterly estimated payments when 22% percentage method significantly under-withholds.
Key Takeaway: High earners often benefit from the aggregate method since 22% flat rate withholding typically under-withholds for those in 24%+ tax brackets.
Sarah Chen, CPA
For employees juggling multiple income sources who need to coordinate withholding across employers
Why multiple jobs complicate bonus withholding
With multiple jobs, each employer applies their chosen withholding method without knowing about your other income. This creates coordination challenges and often leads to under-withholding since neither employer sees your full tax picture.
The compounding problem
Job A: $80,000 salary + $10,000 bonus
Job B: $60,000 salary + $15,000 bonus
Each employer withholds assuming they're your primary income:
Method implications across jobs
If both use percentage method (22%):
If both use aggregate method:
Mixed methods (one each):
Coordination strategies
1. W-4 Step 2(c): Check "multiple jobs" box for higher withholding rates
2. Extra withholding: Add amount on line 4(c) to cover gaps
3. Quarterly payments: Often necessary regardless of methods used
4. Primary job focus: Do most withholding adjustments at highest-paying job
Tracking across employers
Maintain spreadsheet tracking:
This helps identify under-withholding early and adjust accordingly.
Key takeaway: Multiple jobs require proactive withholding coordination since each employer applies their bonus method without seeing your complete income picture.
Key Takeaway: Multiple jobs require careful withholding coordination since each employer applies bonus withholding methods independently without seeing your total income.
Sources
- IRS Publication 15 — Employer's Tax Guide - Methods for Withholding on Supplemental Wages
- IRS Publication 15-A — Employer's Supplemental Tax Guide
Related Questions
Reviewed by Sarah Chen, CPA on February 28, 2026
This content is for educational purposes only and is not a substitute for professional tax advice. Consult a qualified tax professional for advice specific to your situation.