US Federal Income Tax Calculator (2025)

US Federal Income Tax Guide 2025

What's the key thing to understand about 2025 Federal Tax Brackets?

The US uses a progressive tax system with seven brackets. For 2025 (filed in 2026), single filer brackets are: 10% on income up to $11,925; 12% from $11,926 to $48,475; 22% from $48,476 to $103,350; 24% from $103,351 to $197,300; 32% from $197,301 to $250,525; 35% from $250,526 to $626,350; 37% above $626,350. Married filing jointly brackets are roughly double these thresholds. You pay the bracket rate ONLY on income within that bracket — not on your entire income. Example: $75,000 single income is taxed across the 10%, 12%, and 22% brackets in slices, not entirely at the 22% rate that applies to the top portion — a common point of confusion.

What's the difference between Standard Deduction and Itemized?

The 2025 standard deduction is $15,000 single / $30,000 married filing jointly / $22,500 head of household. Most filers take the standard deduction unless their itemized deductions exceed it. Itemized deductions can include: state and local taxes (SALT, capped at $10,000), home mortgage interest (on up to $750,000 of debt), charitable contributions, medical expenses exceeding 7.5% of AGI, and certain investment expenses. The Tax Cuts and Jobs Act doubled the standard deduction, so itemizing is now only worthwhile for a smaller share of taxpayers than before the change, mainly those with large mortgage interest or charitable deductions.

What's the difference between Marginal and Effective Tax Rate?

Marginal rate = the tax rate on your LAST dollar earned. Effective rate = total tax divided by total income. These are very different. A $75,000 single filer has a 22% marginal rate but an effective rate of approximately 11%. This matters when making decisions: a raise of $5,000 is taxed at your marginal rate (22% in this example), not your effective rate. Pre-tax 401(k) contributions save tax at your marginal rate, making them more valuable for higher earners. Roth contributions cost you tax now at your current marginal rate, which is why the Roth-versus-traditional decision hinges on comparing today's marginal rate against your expected rate in retirement.

What should I know about Beyond Federal Tax?

Federal income tax is just one component. Most workers also pay: Social Security (6.2% on wages up to $176,100 in 2025); Medicare (1.45% on all wages, plus 0.9% additional Medicare tax above $200,000 single/$250,000 married); state income tax (0% to 13.3% depending on state); city/local taxes (in some jurisdictions). Total federal payroll burden alone is ~7.65% on top of income tax. A $75,000 single Californian pays approximately $9,200 federal income tax + $5,700 payroll taxes + $4,500 California state income tax — state and local taxes can add a substantial amount on top of the federal bill.

Why Your Whole Income Isn't Taxed at Your "Tax Bracket" Rate

The US federal income tax system is progressive and marginal, meaning only the slice of income within each bracket is taxed at that bracket's rate, not your entire income taxed at the rate of your highest bracket. Someone described as "in the 24% bracket" pays the lower rates on all the income within the lower brackets below it, and only the portion above that bracket's threshold is actually taxed at 24% — their overall effective tax rate on total income is always lower than their marginal (top) bracket rate. This distinction matters enormously for decisions like whether to take extra income (a bonus, a side project, a Roth conversion): only the incremental income at the top is taxed at the marginal rate, not the whole amount, which is a frequently misunderstood point even among otherwise financially literate taxpayers.

Standard Deduction vs. Itemizing — And Why Most Filers No Longer Itemize

Every filer can reduce taxable income by either taking the standard deduction (a fixed amount based on filing status) or itemizing specific deductible expenses — mortgage interest, state and local taxes up to a cap, charitable donations, and certain medical expenses above a threshold — whichever produces the larger reduction. Since the standard deduction was significantly increased by tax law changes some years ago, the majority of US filers now find the standard deduction larger than their itemized total, making itemizing worthwhile mainly for those with substantial mortgage interest, large charitable giving, or high state and local tax burdens. Checking both each year, rather than assuming one always wins, is worthwhile especially in a year with an unusually large deductible expense, like a major charitable gift.

Why a Tax Credit Beats a Tax Deduction

<p>A deduction reduces the income on which tax is calculated, so its value depends on your marginal tax bracket — a $1,000 deduction saves $220 for someone in the 22% bracket but only $120 for someone in the 12% bracket. A credit, by contrast, reduces the tax bill itself, dollar for dollar, regardless of your bracket, so a $1,000 credit saves exactly $1,000 for everyone eligible to claim it (unless it's a non-refundable credit limited by tax owed). This is why a modest tax credit is often worth more than a much larger deduction, and why it's worth checking eligibility for credits — like the Child Tax Credit, education credits, or the Earned Income Tax Credit — before focusing purely on maximizing deductions. Some credits are refundable, meaning they can reduce your tax bill below zero and generate a refund even if you owed little or no tax before the credit; others are non-refundable and can only reduce your liability down to zero. Knowing which type a credit is changes how valuable it actually is to your specific tax situation.</p>

2025 Federal Tax Brackets by Filing Status

Tax brackets differ by filing status, and married filing jointly thresholds are, by design, close to double the single-filer thresholds at most income levels (figures are for the 2025 tax year and typically adjust slightly for inflation each year).

Worked Example: Full Bracket-by-Bracket Tax Calculation

A single filer earns $75,000 and takes the standard deduction of $15,000, giving taxable income of $75,000 − $15,000 = $60,000. Tax is calculated one bracket at a time, not as a flat rate on the whole $60,000: the first $11,925 is taxed at 10% = $1,192.50. The next slice, from $11,925 to $48,475 (that's $36,550), is taxed at 12% = $4,386.00. The remaining taxable income, from $48,475 up to $60,000 (that's $11,525), is taxed at 22% = $2,535.50. Adding the three slices: $1,192.50 + $4,386.00 + $2,535.50 = $8,114.00 total federal income tax. The effective tax rate is total tax divided by gross income: $8,114 ÷ $75,000 ≈ 10.8% — far below the 22% marginal rate that applied only to the last, highest slice of income.

Worked Example: Total Federal Tax Burden Including FICA

Building on the $75,000 single filer's $8,114 federal income tax calculated earlier, payroll (FICA) taxes add a further, separate bill. Social Security: 6.2% × $75,000 = $4,650 (the full salary falls under the Social Security wage base cap). Medicare: 1.45% × $75,000 = $1,087.50. Combined FICA: $4,650 + $1,087.50 = $5,737.50. Adding this to the $8,114 federal income tax gives a total federal tax burden of $8,114 + $5,737.50 = $13,851.50, or an effective total federal rate of $13,851.50 ÷ $75,000 ≈ 18.5% — noticeably higher than the 10.8% effective income-tax-only rate calculated earlier, and before any state or local income tax is even added.

Capital Gains Tax Sits Outside the Ordinary Income Brackets

Long-term capital gains (profit on assets such as stocks or property held for more than a year) are typically taxed at separate, generally lower rates than the ordinary income brackets used for wages: commonly 0%, 15%, or 20%, depending on total taxable income, rather than following the 10%-37% ordinary bracket ladder. Short-term capital gains (assets held one year or less) are taxed as ordinary income at the regular bracket rates instead, which is the main reason holding period is tracked so carefully for investment accounts — selling an asset one day before versus one day after the one-year mark can shift the applicable rate substantially for a higher earner. This separate treatment is also why a retiree living mostly off long-term investment gains can sometimes have a lower effective tax rate than a salaried worker with a similar total income, since a large share of their income may be taxed at the lower capital-gains rates rather than the ordinary brackets.