"I heard a raise can actually leave you with less money because of taxes." This is one of the most persistent pieces of financial folklore, and it's false — but the real math behind why is worth walking through with actual numbers, using the same calculations our salary calculator and tax calculator run.
The setup
A single filer going from a $70,000 salary to $80,000 — a $10,000 raise, US federal tax and FICA only, no state tax for simplicity.
| Federal tax | $6,570.00 |
| Effective tax rate | 9.39% |
| Marginal tax rate | 22% |
| FICA (Social Security + Medicare) | $5,355.00 |
| Net take-home pay | $58,075.00 |
| Federal tax | $8,770.00 |
| Effective tax rate | 10.96% |
| Marginal tax rate | 22% |
| FICA (Social Security + Medicare) | $6,120.00 |
| Net take-home pay | $65,110.00 |
What actually happened
The $10,000 raise turned into $7,035.00 of real, additional take-home pay — 70.35% of the raise, kept. The marginal rate didn't even change: both $70,000 and $80,000 land in the same 22% bracket for a single filer, meaning this raise never even crossed into a new tax bracket. The effective rate rose slightly, from 9.39% to 10.96%, simply because a larger share of total income is now taxed — not because any dollar is being taxed more heavily than before.
This is the direct, numeric answer to the folklore: there is no scenario in a properly functioning progressive tax system where earning more results in less take-home pay. Every additional dollar is taxed at, at most, your marginal rate — never retroactively applied to income you'd already earn without the raise. For a deeper explanation of why brackets work this way, see Marginal vs. Effective Tax Rate.
Where the other $2,965 actually went
Of the $10,000 raise, $2,200 went to additional federal tax ($8,770 − $6,570) and $765 went to additional FICA ($6,120 − $5,355), totaling $2,965 — which checks out exactly against the $7,035 that was kept ($10,000 − $2,965 = $7,035). Nothing mysterious happened to the rest of it; it's the same proportional split that applied to income before the raise, just calculated on a larger number.
Try this with your own numbers
Run your current salary and a hypothetical raise through the salary calculator twice — once at each number — to see your own real before-and-after take-home difference. If you're specifically deciding whether a raise, bonus, or extra freelance income is "worth it" after tax, the marginal rate shown on the tax calculator is the number that actually answers that question.