Cross £50,270 in 2026/27 and you start paying the higher rate of Income Tax — but only on the slice above that line, not your whole salary. It’s the single most common tax misunderstanding, so worth clearing up properly.
What actually happens at £50,270
Below £50,270, everything above your £12,570 Personal Allowance is taxed at 20%. Cross that line, and only the amount above £50,270 is taxed at 40% — the 20% band underneath is untouched. So on a £55,000 salary, you’re not paying 40% on £55,000; you’re paying 40% on just £4,730 of it.
Why people think it’s worse than it is
A pay rise that tips you just over the threshold can feel like a pay cut if you don’t understand marginal rates — but you always take home more from a higher salary, never less, because the extra tax only ever applies to the extra income above the line.
See your own number
Use the Payslp salary calculator to see exactly how much of your income falls into each band.
Why the threshold hasn’t moved much in recent years
Income Tax thresholds are reviewed annually, but haven’t always risen in line with wages — when a threshold is frozen while pay increases, more people cross it each year without ever getting a real pay rise in spending-power terms. This is sometimes called “fiscal drag,” and it’s worth checking each year whether the threshold has moved, not assuming it automatically tracks inflation.
Frequently asked questions
Do I pay 40% on my whole salary once I cross £50,270?
No — only on the portion above £50,270. Everything below that line is still taxed at 20% (or 0% within your Personal Allowance).
Does National Insurance change at the same threshold?
No, National Insurance has its own separate threshold (the Upper Earnings Limit, also £50,270) where the rate drops from 8% to 2% — a different mechanic from Income Tax, worth not confusing the two.