How US Taxes Work — Brackets, Rates & the Big Picture

The Progressive Tax System

The US federal income tax is progressive — meaning higher income is taxed at higher rates. But here's the key: each bracket rate only applies to the income within that bracket, not to all of your income.

If you earn $60,000 as a single filer in 2025, you are not paying 22% on all $60,000. You pay 10% on the first $11,925, 12% on the next chunk, and 22% only on the amount above $48,475. Your actual tax bill is significantly lower than 22% of $60,000.

Common mistake: "If I get a raise and move into a higher bracket, I'll take home less money." This is false. Only the dollars above the bracket threshold are taxed at the higher rate. A raise always increases your take-home pay — your existing income is never retroactively taxed at the higher rate.

2025 Federal Tax Brackets — Single Filers

These rates apply to taxable income — not your gross salary. After deductions, most people's taxable income is considerably lower than what they earn.

Rate	Income Range	Tax
10%	$0 – $11,925	10% of taxable income
12%	$11,926 – $48,475	$1,192.50 + 12% over $11,925
22%	$48,476 – $103,350	$5,578.50 + 22% over $48,475
24%	$103,351 – $197,300	$17,651.50 + 24% over $103,350
32%	$197,301 – $250,525	$40,199.50 + 32% over $197,300
35%	$250,526 – $626,350	$57,231.50 + 35% over $250,525
37%	$626,351+	$188,769.75 + 37% over $626,350

2025 tax year. Married filing jointly brackets are roughly double these thresholds.

2025 Federal Tax Brackets — Married Filing Jointly

Rate	Income Range	Tax
10%	$0 – $23,850	10% of taxable income
12%	$23,851 – $96,950	$2,385 + 12% over $23,850
22%	$96,951 – $206,700	$11,157 + 22% over $96,950
24%	$206,701 – $394,600	$35,302 + 24% over $206,700
32%	$394,601 – $501,050	$80,398 + 32% over $394,600
35%	$501,051 – $751,600	$114,462 + 35% over $501,050
37%	$751,601+	$202,154.50 + 37% over $751,600

2025 tax year, approximate — always confirm current thresholds with the IRS or a tax professional before filing.

Marginal vs Effective Rate — A Real Example

Single filer, $75,000 taxable income (2025):

Bracket	Amount	Tax
10% bracket	$11,925	$1,192.50
12% bracket	$36,550	$4,386.00
22% bracket	$26,525	$5,835.50
Total federal tax		$11,414
Marginal rate (top bracket)		22%
Effective rate (actual % paid)		15.2%

Not All Income Is Taxed the Same Way

• Ordinary income: Wages, salary, bonuses, self-employment income, interest, short-term capital gains. Taxed at the regular bracket rates above.
• Long-term capital gains: Profits from selling assets held more than one year. Taxed at preferential rates: 0%, 15%, or 20% depending on your income — significantly lower than ordinary rates.
• Qualified dividends: Dividends from US corporations held long enough qualify for the same lower capital gains rates (0%, 15%, 20%) rather than ordinary income rates.
• Social Security benefits: Up to 85% of Social Security income may be taxable depending on your combined income. The formula is complex — planning around it matters in retirement.

Long-Term Capital Gains Brackets (2025, Single Filer)

Long-term capital gains and qualified dividends use their own, separate bracket structure — not the ordinary income brackets above:

Rate	Approx. Taxable Income Range (Single)
0%	Up to ~$48,350
15%	~$48,351 – ~$533,400
20%	Above ~$533,400

This is why a retiree living mostly off long-term investment gains, with modest total taxable income, can sometimes pay 0% federal tax on those gains — a very different outcome than the same dollar amount earned as wages.

From Gross Income to Taxable Income

Your bracket is applied to taxable income — which is almost always less than your gross pay. Here's how it flows:

Step	Amount	Note
Gross income	$90,000	All income from all sources
− Above-the-line deductions	−$6,500	401(k), HSA, student loan interest, etc.
= Adjusted Gross Income (AGI)	$83,500	Threshold for many phase-outs and eligibility rules
− Standard deduction	−$15,000	Or itemized deductions if higher (2025 single filer)
= Taxable income	$68,500	The number your bracket is applied to

Know your marginal rate — it guides every decision: Every tax planning decision — whether to contribute more to a 401(k), when to sell an investment, whether to do a Roth conversion — depends on knowing your current marginal rate. A pre-tax 401(k) contribution saves you exactly your marginal rate. If you're in the 22% bracket, $1,000 contributed costs you only $780 out of pocket.

Key Terms

• Marginal Tax Rate: The rate applied to your last dollar of income — i.e., the bracket you're currently in. Earning more does NOT push all your income into the higher bracket.
• Effective Tax Rate: Your total tax bill divided by your total income. Almost always lower than your marginal rate because lower brackets apply to the first portions of your income.
• Taxable Income: Gross income minus above-the-line deductions and either the standard deduction or itemized deductions. This is the number your bracket is applied to — not your salary.
• Tax Liability: The actual dollar amount you owe the IRS before any tax credits are applied. Credits reduce your liability dollar for dollar.

Common Mistakes

• Thinking a raise can reduce take-home pay. As covered above, only the income above a bracket threshold is taxed at the higher rate — a raise never results in less money in your pocket.
• Confusing marginal rate with effective rate when estimating taxes owed. Multiplying your entire income by your top bracket rate significantly overestimates your actual tax bill.
• Applying ordinary income brackets to long-term capital gains. Long-term gains and qualified dividends use their own, generally lower bracket structure — mixing the two leads to overestimating tax owed on investment income.

Key Takeaway: The US tax system is progressive — each bracket only applies to income within that range. A raise never reduces your take-home pay — only the new dollars are taxed at the higher rate. Marginal rate is your top bracket rate; effective rate is your actual percentage of income paid. Brackets apply to taxable income, not gross salary — deductions lower taxable income significantly. Long-term capital gains and qualified dividends are taxed at their own, lower rates (0%, 15%, 20%), and knowing your marginal rate is the foundation of every smart tax decision.

Frequently Asked Questions

Why is my effective tax rate so much lower than my tax bracket?

Because only the income within your top bracket is taxed at that rate — everything below it is taxed at the lower rates for those ranges. Your effective rate blends all the brackets your income passed through, which is why it's almost always lower than your marginal (top) rate.

Do state income taxes work the same way as federal brackets?

Many states with an income tax use a similar progressive bracket structure, but the specific rates and thresholds vary significantly by state, and some states use a flat rate instead. A handful of states have no income tax at all. Check your specific state's rules separately from the federal brackets.

How do tax credits differ from deductions?

A deduction reduces your taxable income, so its value depends on your marginal rate (a $1,000 deduction saves $220 for someone in the 22% bracket). A tax credit reduces your tax bill dollar-for-dollar, so a $1,000 credit saves exactly $1,000 regardless of your bracket — credits are generally more valuable per dollar than deductions.

Why would someone pay 0% tax on capital gains?

Long-term capital gains have their own bracket structure, and the lowest bracket is 0%. Someone with relatively low total taxable income — common for retirees drawing mainly from investments rather than a salary — can realize long-term gains within that 0% range and owe no federal tax on them.

Do tax brackets change every year?

Yes — the income thresholds for each bracket are adjusted annually for inflation, even when the tax rates themselves stay the same. Always check the current year's thresholds rather than assuming last year's numbers still apply.