Why your effective tax rate is lower than you think

A raise that pushes you "into the next bracket" doesn't make your whole paycheck get taxed at that rate. Here's how marginal brackets actually work — and why turning down a raise or under-withdrawing in retirement to "avoid the next bracket" almost always costs you money.

By StevenPG June 16, 2026 6 min read

Educational content only — not financial, tax, or legal advice.

“I turned down the raise — it would’ve put me in a higher bracket and I’d have lost money.” This is one of the most common, and most expensive, misconceptions in personal finance. It is never true under the US federal income tax system, and believing it leads people to decline promotions, skip side income, and — for retirees — pull out less money than they actually need, all to dodge a tax hit that doesn’t exist the way they think it does.

Marginal brackets only tax the income inside them

The US uses a progressive, marginal bracket system. Each bracket’s rate applies only to the slice of income that falls inside that bracket — not to your entire income.

For a single filer in 2025, the brackets look like this:

Bracket	Rate	Income range
1	10%	$0 – $11,925
2	12%	$11,925 – $48,475
3	22%	$48,475 – $103,350
4	24%	$103,350 – $197,300
5	32%	$197,300 – $250,525
6	35%	$250,525 – $626,350
7	37%	$626,350+

If your taxable income is $110,000, you are “in the 24% bracket” — but only the income above $103,350 is taxed at 24%. Everything below that is taxed at the lower rates that came before it: 10% on the first slice, 12% on the next, 22% on the next, and only the last $6,650 at 24%.

Run the numbers with the effective tax rate calculator and you’ll see the total federal tax on $110,000 of taxable income comes out to roughly $19,800 — an effective rate of about 18%, not 24%.

Effective rate vs. marginal rate

These are two different numbers, and conflating them is the entire misconception:

Marginal rate — the rate on your last dollar of income. This is the bracket people refer to when they say “I’m in the 24% bracket.”
Effective rate — your total tax divided by total income. This is what you actually pay, on average, across every dollar you earned.

Effective rate is always lower than marginal rate (except in the lowest bracket, where they’re equal) because every dollar below your top bracket was taxed at a lower rate. The gap between the two grows the higher your income climbs, because more of your income sits in the cheaper, lower brackets.

Why “the raise will put me in a higher bracket” is backwards

A raise — or a bonus, a side gig, a promotion — can only ever increase your take-home pay. There is no income level at which earning one more dollar reduces your net pay under the federal income tax. The worst case is that the next dollar is taxed at your highest marginal rate; it is never taxed at a rate above 37% (the current top federal bracket), and it never reaches back and re-taxes income you already earned at a lower rate.

So if a $5,000 raise pushes $3,000 of it into a new 24% bracket and leaves $2,000 in your existing 22% bracket, you still keep the after-tax value of all $5,000 — you just keep slightly less of the top slice than you might assume. You are always better off, in pre-tax dollar terms, taking the raise.

The one real exception worth knowing: a raise can phase out other things tied to income — certain tax credits, subsidized health insurance premiums, student loan income-driven repayment amounts, financial aid eligibility. Those are worth checking case by case. But that’s a different mechanism entirely from “my bracket went up,” and it rarely erases more than a fraction of the raise.

The same mistake in retirement

The mirror image of this mistake shows up in retirement withdrawal planning. Retirees managing a 401(k) or IRA sometimes withdraw less than they need in a given year because they’re afraid that pulling out more will “bump them into a higher bracket” and tax their whole withdrawal at that rate.

It works exactly the same way as W-2 income: only the withdrawal dollars that land inside the higher bracket are taxed at the higher rate. Under-withdrawing to dodge a bracket that doesn’t apply to your whole withdrawal just means living on less money than you could otherwise afford, or leaving a larger Required Minimum Distribution problem for a later year when brackets — or your own circumstances — might be worse.

Where bracket-awareness does genuinely matter in retirement is multi-year tax planning: deciding how much to convert to a Roth IRA in a given year, or how much of a withdrawal to take from taxable versus tax-deferred accounts, to manage your effective rate over a multi-year horizon. That’s a real strategy — see the Roth conversion ladder calculator — but it’s about smoothing effective rates across years, not avoiding a single bracket as if it retroactively taxes everything.

Try it yourself

The effective tax rate calculator lets you enter any income, pick a filing status and tax year, and see the bracket-by-bracket breakdown build in real time — including the running total and running effective rate as each bracket fills in. Drag the income slider past a bracket boundary and watch the effective rate barely move, even though the marginal rate just jumped.