Key takeaways
The math behind the trap: crossing £50,270
Fiscal drag happens when tax thresholds stay fixed in cash terms while nominal wages rise to keep pace with inflation. Because your Personal Allowance and Higher Rate threshold don't move, a raise that simply keeps up with the cost of living can still push you across a line that used to be reserved for meaningfully higher earners.
The clearest example is crossing £50,270. Below that line, Income Tax is 20% and employee National Insurance is 8%. Above it, Income Tax jumps to 40% while NI drops to 2%, so the combined marginal rate on that slice of income lands around 42%, not simply the intuitive "20% became 40%."
| Gross salary | £48,000 | £53,000 |
| Income Tax | £7,086 | £8,632 |
| National Insurance | £2,834 | £3,071 |
| Net annual pay | £38,080 | £41,297 |
Of the £5,000 gross raise, only around £3,218 lands as extra net pay per year, roughly £268 a month. The first £2,270 of the raise (up to £50,270) is taxed at the normal 32% combined rate; the remaining £2,730 above the threshold is taxed at 42%. The blended effective rate on the whole raise comes out around 36%, noticeably worse than the 32% you'd have paid on the same raise a few years ago before the thresholds froze.
This is a different cliff from the £100k tax trap
This article covers the entry into the 40% Higher Rate band at £50,270. There's a second, steeper cliff further up the income scale: between £100,000 and £125,140, the Personal Allowance itself tapers away, pushing the effective marginal rate to roughly 52%. See the UK 60% tax trap guide if your raise or bonus is pushing you toward six figures.
3 ways to protect your raise from fiscal drag
You don't have to simply accept the drag. A few well-established structures keep income out of your taxable total, so it never gets caught by the 40% band in the first place.
Salary sacrifice pension
Route the portion of a raise that would cross £50,270 straight into your workplace pension instead of taking it as cash. Your taxable salary stays below the threshold, and the sacrificed amount goes into your pension completely free of Income Tax and National Insurance.
Tax-free workplace benefits
Electric vehicle lease schemes and Cycle to Work both let you pay for the benefit out of gross salary before Income Tax is calculated, lowering your taxable income back down.
Bonus sacrifice
If your increase comes as a lump-sum bonus rather than a base salary rise, ask about routing all or part of it directly into a SIPP or workplace pension instead of taking it as cash, avoiding the spike into the higher band for that tax year.
Did your latest raise cross £50,270?
Put your new salary into the UK take-home calculator to see your exact deductions band by band, then enter a pension salary sacrifice amount to see how much stays out of the 40% band.
UK Take-Home CalculatorFrequently asked questions
What is fiscal drag in the UK?
Fiscal drag happens when the government freezes tax thresholds while wages keep rising with inflation. Because the Personal Allowance (£12,570) and the Higher Rate threshold (£50,270) haven't moved since 2021/22, a normal cost-of-living raise now pulls more of your income into higher tax bands than it would have a few years ago. You're not earning materially more in real terms, but you're paying a growing share of it in tax.
What is the 40% tax threshold in the UK?
The Higher Rate (40%) Income Tax band starts at £50,270 of gross income for 2026/27. Everything you earn below that (after the £12,570 Personal Allowance) is taxed at the 20% Basic Rate. Cross £50,270 and every additional pound is taxed at 40% instead of 20%.
How does crossing £50,270 affect my take-home pay?
Two things change at once. Income Tax on earnings above £50,270 doubles from 20% to 40%. At the same time, employee National Insurance drops from 8% to 2% on the same slice of income, because £50,270 is also the Upper Earnings Limit for NI. Combined, you keep roughly 58p of every pound below the threshold and about 58p of every pound above it too, since the NI drop partly offsets the tax rise, but you lose the 20%-only band entirely, so your average tax rate on the whole raise still climbs.
How can I legally reduce the impact of fiscal drag?
The most direct lever is a salary sacrifice pension contribution: routing part of a raise straight into your workplace pension keeps it out of your taxable income entirely, so it never gets taxed at the higher rate in the first place. Non-cash benefits like an EV lease scheme or Cycle to Work also reduce taxable pay. If your raise or bonus pushes you toward or past £100,000, the Personal Allowance taper adds a second, steeper cliff on top of this one, see our £100k tax trap guide.
Related calculators and reading