Taxes & Income

Bonus Tax Calculator (Supplemental Withholding)

Calculate after-tax net take-home pay on annual work bonuses, applying the IRS 22% flat supplemental wage withholding rate, FICA, and state tax.

What this calculator does

The Bonus Tax Calculator (Supplemental Withholding) estimates your result instantly from the values you enter, using standard taxes & income formulas. Calculate after-tax net take-home pay on annual work bonuses, applying the IRS 22% flat supplemental wage withholding rate, FICA, and state tax. Calculations run in your browser, so nothing you type is sent to a server, and the output is an estimate for planning rather than financial advice.

Enter 0 for no-income-tax states.

About Bonus Tax Calculator (Supplemental Withholding)

The Bonus Tax Calculator calculates how much of your gross corporate bonus check you actually take home after the mandatory IRS 22% supplemental flat tax withholding, 7.65% FICA, and state income taxes.

Formula & Mathematical Calculation

Federal Supplemental Withholding = Gross Bonus × 22% (or 37% for > $1M)

FICA Taxes = Gross Bonus × 7.65% (6.2% Social Security + 1.45% Medicare)

Net Bonus Take-Home = Gross Bonus - Federal Withholding (22%) - FICA (7.65%) - State Tax

Calculation Example

$10,000 Gross Annual Bonus (Single, 5% State Tax): Federal Tax (22% = $2,200) + FICA (7.65% = $765) + State (5% = $500) = $3,465 Withheld → Net Bonus Check in Hand = $6,535.00 (34.65% total withholding).

Key Benefits

  • Applies IRS statutory 22% supplemental wage withholding rate
  • Itemizes FICA Social Security and Medicare deductions
  • Explains why bonus checks appear taxed higher than regular paychecks
  • Clarifies that excess withholding is refunded at annual tax filing
  • 100% free payroll tax tool

How to Use this Calculator

  1. Enter Gross Bonus Amount
    Input total bonus dollar amount (e.g. $5,000, $10,000).
  2. Select State of Residence
    Choose state to apply local supplemental tax rate.
  3. Include 401(k) Bonus Contribution (Optional)
    Enter percentage deducted for 401(k).
  4. Calculate Net Bonus
    Click Calculate to view net take-home bonus payout.

Assumptions & Limitations

What the calculation assumes

  • Every value you enter is treated as an exact, known amount.
  • Rates and contributions are assumed to stay constant for the whole period unless the form asks for them separately.
  • Results use standard financial formulas and ignore fees, penalties and promotional terms that are not entered above.
  • Inflation, tax changes and market volatility are not modelled unless a field for them is provided.
  • Amounts are unit-agnostic: results are returned in the same currency you enter.

What it does not cover

  • Bonus Tax Calculator (Supplemental Withholding) produces estimates for education and planning, not a quote, offer or professional advice.
  • Real-world outcomes differ when fees, taxes, rounding rules or provider-specific terms apply.
  • Local regulations and tax rules vary by country and change over time; verify current rules for your jurisdiction.
  • Figures are only as accurate as the inputs you supply — check them before acting on the result.
  • For decisions with lasting financial impact, confirm the numbers with a qualified professional.

Frequently Asked Questions

The IRS classifies bonuses as 'supplemental wages'. Most employers use the statutory flat withholding method of 22% for supplemental wages up to $1 million, rather than calculating withholding using standard W-4 payroll brackets.

No. When you file your annual tax return, all earned income (salary and bonuses) is pooled together and taxed at your ordinary income tax rates. Any excess withholding from your bonus is refunded to you.

Because the US tax system is progressive, only the dollars above the bracket threshold are taxed at the higher marginal rate. Entering a higher bracket never reduces your overall net take-home pay.

Yes. Bonuses are subject to standard FICA payroll taxes (6.2% Social Security up to the annual wage cap, plus 1.45% Medicare, and an additional 0.9% Medicare surtax for high earners above statutory thresholds).

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Next step: browse the full Taxes & Income calculators or read the related guides for context before you decide.