How much federal income tax will I pay?

It depends on your taxable income, filing status, and deductions. A single filer earning $75,000 with the standard deduction ($15,000) has a taxable income of $60,000 and pays roughly $8,330 in federal income tax — an effective rate of about 11.1% of gross income.

Is federal income tax the only tax on my paycheck?

No. In addition to federal income tax, your paycheck is also subject to Social Security tax (6.2%), Medicare tax (1.45%), and possibly state and local income taxes. Federal income tax is usually the largest single deduction, but FICA and state taxes add significantly to your total burden.

Federal Income Tax Explained

Tax Basics3 min read·Updated for 2025

Quick Answer

Federal income tax is a tax levied by the U.S. government on your earnings, using a progressive system of seven brackets ranging from 10% to 37%. It is the largest tax most workers pay and is collected through paycheck withholding throughout the year. Your actual tax bill depends on your filing status, deductions, and credits — not just your salary.

How Federal Income Tax Is Calculated

Your federal income tax follows a specific calculation path:

Step 1: Determine Gross Income

Add up all income sources — salary, bonuses, side hustle income, investment gains, and other earnings. This is your gross income.

Step 2: Calculate AGI

Subtract above-the-line deductions like 401(k) contributions, HSA contributions, and student loan interest to get your Adjusted Gross Income (AGI).

Step 3: Apply Deductions

Subtract either the standard deduction ($15,000 single / $30,000 married in 2025) or your itemized deductions, whichever is greater. This gives you your taxable income.

Step 4: Apply Tax Brackets

Your taxable income is taxed through the progressive brackets. Each portion of income is taxed at its bracket rate.

Step 5: Subtract Credits

Tax credits reduce your tax bill dollar-for-dollar. Common credits include the Child Tax Credit ($2,000 per qualifying child) and education credits.

Real Example With Actual Numbers

Marcus is single, earns $90,000, contributes $8,000 to his 401(k), and lives in Texas. No dependents.

Step	Calculation	Amount
Gross income	Salary	$90,000
401(k) deduction		-$8,000
AGI		$82,000
Standard deduction		-$15,000
Taxable income		$67,000

Federal tax on $67,000:

10% on $11,925 = $1,192.50
12% on $36,550 = $4,386.00
22% on $18,525 = $4,075.50
Total: $9,654.00

Marcus's marginal rate is 22%, but his effective rate is 14.4% on taxable income or 10.7% on gross income. See your own numbers at the SalaryHog calculator.

Federal Income Tax vs Other Taxes

Federal income tax is just one piece of the puzzle. Your paycheck also gets hit with:

FICA taxes: Social Security (6.2%) plus Medicare (1.45%) = 7.65% on every dollar
State income tax: Ranges from 0% in Florida and Texas to over 13% in California. See how state taxes work
Local income taxes: Some cities like New York City add additional tax

For someone in the 22% federal bracket living in a state with 5% tax, the combined marginal rate on the next dollar earned is roughly 34.65% (22% + 5% + 7.65% FICA).

Key Numbers for 2025

Item	Amount
Standard deduction (single)	$15,000
Standard deduction (married jointly)	$30,000
401(k) contribution limit	$23,500
Social Security wage base	$176,100
Top federal bracket (37%) begins at	$626,351 (single)

Filing and Payment

Most employees pay federal income tax through withholding — money taken from each paycheck. Self-employed workers must make quarterly estimated payments instead.

Your annual tax return (due April 15) reconciles what was withheld versus what you actually owe. Compare your situation across filing statuses with the married calculator or estimate your take-home pay in any state with the SalaryHog calculator.