Why a Pay Raise Can Still Leave You Behind

Every year someone declines overtime or turns down a raise because a colleague told them it would push them into a higher tax bracket and cost them money. The arithmetic behind that belief is almost always wrong, but the misunderstanding persists because the correct explanation rarely gets written down in numbers. Here is the version with actual figures, including the narrow cases where the pessimists are genuinely right.

Marginal Is Not the Same as Effective

The United States federal income tax uses marginal brackets. Each rate applies only to the income within that bracket’s range, not to your entire income. For a single filer, the 2025 brackets began at 10% up to roughly $11,925, then 12% up to about $48,475, then 22% up to around $103,350, then 24% up to roughly $197,300.

If you earn $100,000 and receive a raise to $105,000, you do not pay 24% on $105,000. You pay 10% on the first slice, 12% on the next, 22% up to $103,350, and 24% only on the $1,650 that crosses into the new bracket. The raise is still worth taking, and the marginal rate applies to a very small share of the total.

What the Raise Actually Nets

Figures are illustrative and ignore state tax, payroll tax, and deductions. The pattern holds at every bracket boundary: the net gain stays comfortably positive because only the portion above the threshold is taxed at the higher rate.

Where the Disappearing Money Actually Goes

The raise does not vanish into the bracket. It disappears into things that phase out with income. These are the real cliffs, and they are worth knowing precisely because they are easy to miss:

Child Tax Credit phase-out: the credit begins reducing above a modified adjusted gross income threshold, and each $1,000 above it reduces the credit by $50.

Education credits: the American Opportunity Credit and Lifetime Learning Credit phase out over defined income ranges, and a modest raise inside that range can reduce the credit meaningfully.

IRA deduction: if you or your spouse have a workplace retirement plan, the traditional IRA deduction phases out across an income band. Losing the deduction raises taxable income, which compounds the effect.

Premium tax credits: under marketplace health coverage, subsidies decrease as income rises, and the loss can be substantial in the range just above the eligibility threshold.

The Rare Cases Where a Cliff Exists

True cliffs — where earning $1 more leaves you with less money overall — are almost entirely the product of benefit phase-outs rather than tax brackets. They occur in narrow income windows, usually where a single benefit is withdrawn abruptly rather than gradually.

Even in those cases, the sensible response is not to refuse the raise. It is to adjust the deductible contributions that move your adjusted gross income back below the threshold. Increasing a traditional 401(k) contribution by the right amount can recover the phase-out while keeping the raise.

A Worked Example

A single filer earning $102,000 receives a $4,000 raise to $106,000. Federal tax rises by roughly $930. Take-home rises by about $3,070, or around $256 per month. If that same person crossed a Child Tax Credit phase-out threshold in the same year, the credit might drop by $150-$300, reducing the net gain to roughly $2,770 — still a clear improvement.

If instead they had contributed $4,000 more to a pre-tax retirement account, taxable income would be unchanged, the credit would be preserved, and the take-home difference in the current year would be small while the retirement balance grew by $4,000.

Run at a lower income the same logic still holds. A worker moving from $46,000 to $49,000 sees roughly $240 of the raise taxed at 22% instead of 12%, keeping about $2,600 of the $3,000. In every bracket transition the amount exposed to the higher rate is small, and the total effective rate rises by a fraction of a percentage point rather than jumping.

Frequently Asked Questions

Can a raise ever reduce my take-home pay? Only through benefit phase-outs, and only in specific income windows. Through brackets alone, no — the marginal system guarantees the next dollar is always worth more than zero, because no rate in the schedule exceeds 100%.

Does the same logic apply in the UK and Canada? Yes. The UK uses marginal bands with a personal allowance that tapers above £100,000, creating a genuine effective 60% zone over a limited range. Canada uses federal brackets plus provincial brackets, both marginal.

What about payroll tax? Social Security tax applies only up to a wage cap and then stops, so high earners see a smaller marginal payroll rate above the cap. Medicare tax has no cap and adds a surcharge above a high threshold.

How should I compare two offers? Compare net figures, not gross. A higher salary with a larger retirement match and lower commuting cost can beat a headline number that looks better, and the marginal rate difference between two offers is usually trivial next to those factors.

To model your own numbers, the tax calculator handles the bracket math on a given income, and the percentage calculator converts the differences into monthly figures.

For the broader picture, the main calculator site has loan, investment, and budget tools that pair with the tax figures above.