How tax brackets actually work

The biggest tax myth in existence: 'I don't want that raise, it'll push me into a higher bracket and I'll take home less.' This is never true. Ever. It's not how brackets work.

Marginal vs. effective

Tax brackets are marginal, which means the higher rate only applies to the dollars inside that bracket. Your first $11,600 is taxed at 10%. The next chunk at 12%. The next at 22%. And so on. Moving up a bracket only affects your last dollar, not your first.

Why this matters

Because people make real decisions — turning down raises, avoiding overtime, declining promotions — based on this misunderstanding. Every extra dollar of income always nets you more after-tax money. It just might net you less than you expected. Never less than zero.

The 2025 brackets, laid out

Here are the actual federal brackets for 2025 (the return you file in early 2026). Remember these apply to TAXABLE income — what's left after the standard deduction ($15,750 single, $31,500 married filing jointly in 2025) or your itemized deductions. So a single filer earning $60,000 in salary has only about $44,250 of taxable income before the brackets even start counting.

The full math on a real paycheck

Let's walk an $85,000 single earner through the entire calculation, because seeing it once fixes the misunderstanding permanently. Start with $85,000 of wages. Subtract the $15,750 standard deduction: $69,250 of taxable income. Now stack the brackets: the first $11,925 is taxed at 10% ($1,193). The next $36,550 — from $11,926 up to $48,475 — is taxed at 12% ($4,386). The remaining $20,775 — from $48,476 up to $69,250 — is taxed at 22% ($4,571). Total federal income tax: about $10,150.

Notice what happened. This person is 'in the 22% bracket,' but their effective federal rate is $10,150 divided by $85,000 — just 11.9%. Barely more than half their headline bracket. The marginal rate (22%) tells them what the next dollar of overtime is worth; the effective rate (11.9%) tells them what they actually paid. Confusing the two is how people convince themselves a raise isn't worth taking.

Common mistakes this myth causes

• Turning down overtime or a raise 'to stay in a lower bracket.' The extra income is always taxed only at the margin — a $1,000 raise in the 22% bracket nets you $780, not a pay cut.
• Panicking about a bonus 'pushing you into a new bracket.' Even if the bonus crosses a bracket line, only the dollars above the line get the higher rate.
• Making huge 401(k) contributions solely to 'get out of a bracket.' Contributing pre-tax is smart, but the benefit is the marginal rate on those specific dollars — you don't unlock a lower rate on everything else you earned.
• Assuming a side hustle is 'taxed at 40%.' Side income stacks on top of your salary at your marginal rate plus self-employment tax if applicable — knowable, plannable, and never more than 100%.

Brackets move every year — use that

The bracket thresholds are indexed to inflation, which means they creep upward annually. In a high-inflation year, the brackets can jump 5-7%, quietly cutting taxes for anyone whose raise didn't keep pace. This also creates planning opportunities at the seams of years: if you control the timing of income — a year-end bonus that could land in December or January, a Roth conversion, a large invoice — you can aim it at whichever year leaves more room in a lower bracket. Someone retiring in June, for example, has a half-income year where the 12% and 22% brackets are only partially filled: often the perfect year to convert traditional IRA money to Roth at rates they may never see again.

Also remember that federal brackets are only one layer. Most states add their own income tax, ranging from zero (Texas, Florida, and seven others) to over 13% at the top in California — and state systems have their own bracket structures, some flat, some progressive. Your true marginal rate is the federal bracket plus your state's, plus 7.65% FICA on wages. A '22% bracket' Californian earning $85,000 actually faces a combined marginal rate around 39% on the next dollar of salary. That combined number — not the federal bracket alone — is what should drive decisions like traditional-versus-Roth contributions.

The one real exception: benefit cliffs

While tax brackets can never make a raise cost you money, certain government benefits and credits CAN have hard cutoffs. Health insurance subsidies, the Earned Income Tax Credit phase-out, income-driven student loan payments, and programs like SNAP have income thresholds where an extra $1,000 of earnings can reduce benefits by more than $1,000. These 'benefit cliffs' are real and worth checking if you receive income-tested benefits — but they are a feature of benefit programs, not of tax brackets. The bracket system itself is smooth by design: every additional dollar earned is money in your pocket.

If you remember nothing else, remember the two questions the bracket system answers. 'Should I earn this extra dollar?' — always yes, and your marginal rate tells you how much of it you keep. 'Should I defer this dollar into a pre-tax account?' — compare your marginal rate today against your expected rate in retirement, because that spread is the entire value of the deferral. People who confuse marginal with effective rates get both questions wrong: they refuse raises that would have enriched them, and they misjudge retirement contributions by imagining their whole income taxed at the top bracket. Two definitions, learned once, fix a lifetime of decisions.