Bonus Tax Calculator

Bonus Tax Calculator

Calculate how your bonus will be taxed. Bonuses are considered supplemental wages and can be withheld differently than regular pay.

Bonus Withholding Methods

Method	How It Works	When Used
Flat Rate (22%)	Employer withholds flat 22% federal	Most common method
Aggregate	Bonus added to regular pay, taxed as one	Some payroll systems
37% Rate	Flat 37% for bonuses over $1 million	High compensation

Bonus Tax Calculator

``javascript function calculateBonusTax(bonusAmount, method = 'flat', annualSalary = 0) { // Flat rate method (22% federal) if (method === 'flat') { const federalWithholding = bonusAmount * 0.22; const socialSecurity = bonusAmount * 0.062; const medicare = bonusAmount * 0.0145; const totalWithholding = federalWithholding + socialSecurity + medicare;

return { bonusAmount, federalWithholding: federalWithholding.toFixed(2), socialSecurity: socialSecurity.toFixed(2), medicare: medicare.toFixed(2), totalWithholding: totalWithholding.toFixed(2), netBonus: (bonusAmount - totalWithholding).toFixed(2) }; }

// Aggregate method (combined with salary) const payPeriodSalary = annualSalary / 12; const combinedPay = payPeriodSalary + bonusAmount; // Tax calculated on combined pay, then subtract regular withholding // (Simplified calculation) return { method: 'aggregate', combinedPay }; } ``

Bonus Tax Breakdown ($10,000 Bonus)

Tax Type	Rate	Amount
Federal Income	22%	$2,200
Social Security	6.2%	$620
Medicare	1.45%	$145
Total Federal	29.65%	$2,965
State (varies)	0-13%	$0-$1,300
Net Bonus	~70-78%	$7,035-$7,735

Why Bonuses Seem Heavily Taxed

Bonuses aren't taxed at a higher *rate*, but withholding is often higher because:

• 22% flat rate may exceed your actual marginal rate
• Aggregate method may temporarily push you into higher bracket
• You get excess withholding back as a larger refund

At year-end, bonuses are taxed at your normal marginal rate—any over-withholding is refunded.

Worked Through the Brackets

On $75,000 of gross income, filing single, taking the $14,600 standard deduction — so $60,400 of taxable income:

Bracket	Range	Income taxed here	Tax
10%	$0 – $11,600	$11,600	$1,160
12%	$11,600 – $47,150	$35,550	$4,266
22%	$47,150 – $100,525	$13,250	$2,915
Total			$8,341

That is a 11.1% effective rate against a 22% marginal rate. The two answer different questions: the marginal rate is what the next dollar costs, and it is the one that decides whether a 401(k) contribution or an extra shift is worth it. The effective rate is what you actually paid, and it is the one to budget against.

The Same Income, Different Sources

Source	Federal tax on it
Wages (above)	$8,341
Self-employment profit	$8,341 income tax plus $10,597 SE tax
Long-term capital gain of $10,000	$1,500 at 15%

Where income comes from changes the bill more than how much of it there is. A self-employed filer at this level pays roughly $10,597 that an employee never sees, because there is no employer paying the other half of FICA.