Federal tax · FICA · State tax · Monthly take-home · Effective rate · All filing statuses
How US Federal Income Tax Works in 2026
The US uses a progressive tax system, meaning different portions of your income are taxed at different rates. You don't pay 22% on your entire income when you're in the 22% bracket — you pay 10% on the first $11,600, 12% on the next $35,550, and 22% only on income above $47,150. This is the most commonly misunderstood aspect of US taxes.
2026 Federal Tax Brackets (Single Filer)
- 10% — $0 to $11,925
- 12% — $11,926 to $48,475
- 22% — $48,476 to $103,350
- 24% — $103,351 to $197,300
- 32% — $197,301 to $250,525
- 35% — $250,526 to $626,350
- 37% — Over $626,350
How to Legally Reduce Your Tax Bill
- Max out your 401(k) — $23,500 in 2025 is fully pre-tax, directly reducing your taxable income
- HSA contributions — Triple tax advantage: pre-tax contributions, tax-free growth, tax-free withdrawals for medical
- Itemize deductions — If mortgage interest + state taxes + charitable giving exceed $14,600 (single standard deduction)
- Roth IRA — After-tax contributions now, tax-free growth and withdrawals in retirement
- Tax-loss harvesting — Offset capital gains with capital losses in your investment portfolio
Frequently Asked Questions
What is the difference between marginal and effective tax rate?
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Your marginal rate is the rate on your last dollar of income — the highest bracket you fall into. Your effective rate is your total tax divided by total income — always lower than the marginal rate. If you earn $100,000 and pay $18,000 in federal tax, your effective rate is 18% even though your marginal rate is 22%. The effective rate is the number that actually matters for financial planning.
Does this calculator include FICA taxes?
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Yes. FICA includes Social Security (6.2% on wages up to $176,100 in 2026) and Medicare (1.45% on all wages, plus an additional 0.9% on wages above $200,000 for single filers). For a $100,000 salary, that's approximately $7,650 in FICA taxes — a significant component most people underestimate.
How much does a 401k contribution actually save in taxes?
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Every dollar contributed to a traditional 401(k) reduces your taxable income by one dollar. In the 22% bracket, a $10,000 contribution saves $2,200 in federal taxes — plus state taxes. The actual cost to you is $7,800, but your retirement account grows by $10,000. At the 24% bracket, the same $10,000 contribution costs only $7,600 out-of-pocket.