Raise math: what a 4% raise is after tax and benefits

"You're getting 4%" is a sentence about annual gross pay. Your bank account lives in per-paycheck net. Converting one to the other is mechanical, and it is worth doing before you plan around the new number.

The setup

Assumptions for the example, stated so you can swap in your own:

• Salary: $60,000, rising 4% to $62,400. Raise = $2,400 a year.
• Paid biweekly: 26 paychecks.
• 401(k): 6% of pay, pre-tax.
• Social Security 6.2% and Medicare 1.45%: 7.65% combined.
• Federal: the raise falls entirely inside the 12% bracket.
• State: an assumed flat 5%. Your state may have no income tax, a flat rate, or brackets.
• Health and other benefit premiums: unchanged by the raise.

The raise, one line at a time

Work only the slice that changed. The rest of the stub stays as it was.

1. Gross increase. $2,400 ÷ 26 = $92.31 per paycheck.
2. 401(k). 6% × $92.31 = $5.54. A percentage contribution grows with pay automatically.
3. Social Security and Medicare. These apply to the full $92.31 — a 401(k) contribution does not reduce them. $92.31 × 6.2% = $5.72; $92.31 × 1.45% = $1.34. Total $7.06.
4. Taxable for income tax. $92.31 − $5.54 = $86.77.
5. Federal. 12% × $86.77 = $10.41.
6. State. 5% × $86.77 = $4.34.
7. Net increase. $92.31 − $5.54 − $7.06 − $10.41 − $4.34 = $64.96.

Over a year, that is $64.96 × 26 = $1,688.96 more in deposits. (The quoted raise is $2,400; $92.31 × 26 is $2,400.06, a rounding artifact payroll absorbs over the year.)

Why per-paycheck withholding may not match exactly

Federal withholding uses the IRS percentage-method tables in Publication 15-T, applied to your W-4. Those tables approximate your bracket; they do not calculate your final tax. If the raise pushes part of your income into the next bracket, only the part above the line is taxed at the higher rate — the rest of your pay is not touched. Your actual paycheck change can differ from this example by a few dollars either way.

The lines that can move besides tax

Line	Moves with a raise?	Why
401(k) or 403(b)	Yes, if set as a percentage	Fixed-dollar elections stay flat
Employer match	Yes, usually	Matches are typically a percent of pay
Health premium	Usually no	Most premiums are flat by tier
Salary-based life or disability	Sometimes	Coverage keyed to salary can raise premium
Imputed income on group life	Sometimes	Coverage over $50,000 creates taxable imputed income; more coverage, more imputed income
Social Security	Stops if you pass the wage base	Not relevant at $62,400

The salary-based coverage lines are easy to miss. If your employer provides life insurance at a multiple of salary, the raise increases the coverage. Coverage above $50,000 creates imputed income under the group-term life rules, which adds a small taxable amount to each stub. See group life coverage for how that line works.

Three ways to read the same raise

• As take-home: $64.96 per paycheck.
• As take-home plus savings: $64.96 + $5.54 = $70.50 per paycheck that is yours in some form. If your employer matches the 401(k), add the match.
• As a percent of the quote: $64.96 ÷ $92.31 ≈ 70%. In this example, roughly seven of every ten dollars of the raise arrive in the bank account.

None of these is the "real" raise. They answer different questions: budgeting, saving, and comparing offers.

When the raise first shows up

A raise effective mid-period may be split across two rate lines on one stub, or paid later as Retro pay. Retro pay is often withheld as supplemental wages, which can look heavy; see bonus withholding. And if the raise comes with a new pay frequency, re-run the math per paycheck; see biweekly vs semimonthly.

Run it for your own stub

Take the gross change per paycheck, subtract any percentage-based pre-tax deductions, apply 7.65% to the full gross change, apply your federal bracket and your state rate to the pre-tax-reduced amount, and add up. Then check it against your first stub at the new rate.