What the 60% tax trap actually means
For the 2026/27 tax year, the standard Personal Allowance remains at £12,570. Once adjusted net income rises above £100,000, that allowance starts to shrink. Broadly, you lose £1 of Personal Allowance for every £2 of income above the threshold until it disappears completely at £125,140.
Why does this matter? Because each extra £1 in that band is not only taxed at the higher rate, it can also remove part of the income that would otherwise have been tax free. In practical terms, that creates an effective 60% income tax effect for many people in the taper zone. If National Insurance or loan deductions also apply, the real drag can feel even heavier.
Why people often miss it
On paper, a salary increase from £99,000 to £110,000 looks straightforward. In real life, it often creates a confusing payslip conversation. People assume the step up will land mostly in their pocket, then notice the monthly uplift feels smaller than expected.
This is one reason the UK Net Pay calculator shows both an effective deduction rate and a marginal deduction rate. Annual totals matter, but so does the feel of the next pound earned. The taper zone is exactly where those two ideas start to diverge in a way that is hard to spot without modelling the numbers.
A simple way to think about it
Imagine two people receive the same nominal pay rise, but one of them moves into the £100,000 to £125,140 band. The second person may still be better off overall, but the value of the raise is being compressed by the taper. That does not mean the raise is pointless. It means the planning around it matters more.
- Bonus timing becomes more important.
- Pension salary sacrifice becomes more interesting.
- Comparing gross pay alone becomes less useful.
- Net pay planning becomes much more important than headline salary.
What people usually do next
This is not financial advice, but the practical next step is often to model scenarios rather than rely on instinct. That could mean:
- checking the difference between a normal pay rise and a bonus,
- seeing what salary sacrifice pension does to adjusted earnings,
- testing whether a target net figure is realistic using the reverse calculator,
- or comparing two salary options side by side.
This is where cleaner calculators can beat older, more cluttered tools. The decision is rarely just “what is my tax?†It is usually “what does the next move do to the money I actually keep?â€
Why this matters in 2026/27
Higher earners are increasingly aware that tax planning is not just for business owners. Ordinary employees hitting six figures for the first time can run into the taper without realising it. That is why this issue keeps coming back in salary, promotion, and bonus conversations.
If you are in or near the taper zone, the best approach is to stop guessing and model your own numbers. Use the calculator first, then use the comparison mode to test a second salary or the reverse mode to work backwards from the net pay you want to protect.
Use the calculator with this guide
Start with your annual or monthly pay, add any bonus, then watch the warning card if your projected gross lands between £100,000 and £125,140. That alert exists for a reason: it is one of the most important planning bands on the whole site.
For official background on allowances and tax bands, use the relevant GOV.UK and HMRC sources alongside your own payroll or adviser if your position is more complex.