Pay Raise Percentage: How to Work Out What Your Increase Is Really Worth

Your manager says "we can do three percent" and you nod, then spend the drive home trying to work out what that means in money. It is small arithmetic, but people get it wrong in one specific way, and the after-tax answer is smaller than it sounds.

The arithmetic, and the mistake people make

The formula is (new pay minus old pay) divided by old pay, times 100. Go from $52,000 to $55,000 and the increase is $3,000. Divide $3,000 by $52,000 and you get 0.0577, so 5.77%.

The common error is dividing by the new salary. $3,000 divided by $55,000 gives 5.45%, which understates the raise by about a third of a percentage point. The old figure is the baseline you grew from, so it belongs on the bottom. The same rule holds in reverse: if pay drops, the original figure is still the denominator.

Hourly raises work identically

Going from $18.50 to $19.75 an hour is a $1.25 increase, and $1.25 divided by $18.50 is 6.76%. To see it annually, multiply by the hours you actually work. At 2,080 hours a year that extra $1.25 is $2,600 before tax. At 30 hours a week it is closer to $1,950. Part-time hours change the headline number a lot, even though the percentage is the same.

What the raise is worth after tax

Gross raise figures are not what lands in your account. A raise sits on top of your existing income, so it is taxed at your marginal rate rather than your average rate. That catches people out, because the average rate is the friendlier number.

Take that $3,000 in the US. In the 22% federal bracket, add 7.65% for Social Security and Medicare, plus roughly 5% state tax, and about 34.65% comes off. You keep around $1,960 a year, or $163 a month. In the UK, a £2,000 raise for a basic rate taxpayer loses 20% income tax and 8% National Insurance, leaving £1,440, or £120 a month. Our take-home pay walkthrough shows where each of those deductions comes from.

Inflation takes another slice

A raise only counts if it beats price rises. Subtract the inflation rate from your percentage for a rough real figure. A 3% raise in a year when prices went up 3.4% is a real cut of about 0.4%. More on the payslip, slightly less in the trolley. Worth saying out loud in a review, because 3% sounds generous until the other number sits beside it.

Using the calculator and where to find the inputs

There are three fields and you fill in whichever two you know. Current pay plus new pay gives you the percentage. Current pay plus a percentage gives you the new figure, which is handy when someone offers "about four percent" and you want the actual number before you answer. New pay plus a percentage works backwards to what you were on.

Use gross pay, the figure before any deductions. In the US that is the gross pay line on your pay stub, or the annual salary on the offer letter, not the amount that reaches the bank. In the UK it is the gross figure on your payslip or the salary written into your contract. Keep both sides in the same period: annual against annual, hourly against hourly. Mixing an old annual salary with a new hourly rate is the fastest route to a nonsense answer. If you are stacking several years of increases, the salary increase guide covers how compounding changes the total.

Common questions

Is a 3% raise good? It is middle of the road for a routine annual review in both countries. Whether it is good depends on inflation and on what the same job pays elsewhere. The larger jumps usually come from promotions or moving employer, not from the annual cycle.

How do I calculate a raise if my hours changed too? Compare hourly rates, not weekly or monthly totals. If your pay rose because you picked up extra shifts, that is more work rather than a raise. Divide each period's pay by its hours first, then run the percentage on the two rates.

Should I use gross or net pay? Gross, for the headline percentage. Net pay shifts around with tax code changes, pension contributions and benefit deductions, so a net comparison can show a "raise" that is really a tax adjustment. Work the percentage on gross, then check the after-tax figure as a separate step.

My raise was backdated three months. Does that change the percentage? No. The percentage is based on the rate, not on the back pay. The lump sum for those months is separate, and it often looks over-taxed in the month it arrives because payroll treats it as a spike in earnings. It evens out across the tax year.