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A pay rise always increases your take-home pay · but the gross increase and the net increase differ because of marginal tax rates. If your raise pushes your income into a higher tax band, the extra earnings above the threshold are taxed at the higher rate.
Example: If your salary rises from £48,000 to £53,000, the first £2,270 of the rise is in the basic rate band (taxed at 20% + 8% NI = 28%) and the remaining £2,730 is in the higher rate band (taxed at 40% + 2% NI = 42%). Your net gain is less than the gross increase, but you are always better off.
The real value of your raise: To understand the true value, also consider inflation. If your pay rise is 3% and inflation is 4%, your real purchasing power has actually fallen by approximately 1% despite the nominal increase. Use the Inflation Calculator to check the real value of your pay.