Example
Take-home pay on GBP 100,000
A worked example of take-home pay at GBP 100,000, the threshold where the personal allowance taper begins and the effective marginal tax rate can exceed 60 percent.
Scenario
GBP 100,000 is one of the most significant thresholds in UK tax planning. It is the point where the personal allowance begins to taper, which means that for every GBP 2 of income above GBP 100,000, GBP 1 of personal allowance is lost. This creates an effective marginal tax rate that can exceed 60 percent in the taper zone, making it one of the most commonly discussed salary levels in UK pay planning.
What to notice
The headline take-home figure at GBP 100,000 looks reasonable in isolation. The problem becomes visible when you model what happens with an extra GBP 1,000, GBP 5,000, or GBP 10,000 on top. In the taper zone between GBP 100,000 and GBP 125,140, the effective marginal rate on additional income is dramatically higher than the standard 40 percent higher-rate band.
This means a raise from GBP 100,000 to GBP 110,000 delivers far less additional take-home pay than a raise from GBP 90,000 to GBP 100,000. That counterintuitive result catches many people off guard.
Why salary sacrifice is especially powerful here
At GBP 100,000, salary sacrifice does not just save tax at 40 percent. If it reduces adjusted income below the taper threshold, it can also restore some or all of the personal allowance. That means the effective saving from salary sacrifice can be far greater than at any other salary level.
This is why pension planning at this threshold is one of the highest-value decisions a UK taxpayer can make. Modelling the trade-off properly is essential.
The 60 percent trap in practice
Between GBP 100,000 and GBP 125,140, the combined effect of 40 percent income tax plus the personal allowance taper creates an effective marginal rate of around 60 percent. Add employee National Insurance and the effective rate on each additional pound can exceed 60 percent.
For a detailed explanation of how this works and what to do about it, see the guide to the 60 percent tax trap.
Practical interpretation
If you earn GBP 100,000 or are approaching it, the most important question is not just "What is my take-home?" but "What happens to my take-home if my income moves above this threshold?" The answer determines whether it is worth negotiating salary sacrifice, deferring a bonus, or structuring compensation to stay below the taper.
Best next step
Run the take-home pay calculator to see your baseline position. Then use the salary sacrifice calculator to model how much pension contribution it would take to keep adjusted income at or below GBP 100,000. The pay rise calculator will show exactly how little of a raise you keep in the taper zone.
Try the calculators
Run your own numbers through the calculators that connect to this content.
Related guides
Guide
How take-home pay is really calculated
A plain-English guide to what sits between gross salary and spendable pay in the UK, and why the monthly number often feels different from the headline salary.
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Salary sacrifice and adjusted income
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Guide
The 60 percent tax trap explained
A practical UK guide to the 60 percent tax trap between GBP 100,000 and GBP 125,140, why it exists, how it affects take-home pay, and what salary sacrifice and pension planning can do about it.
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Worked examples
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Salary sacrifice on £100,000
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Take-home pay on GBP 70,000
A worked example of take-home pay at GBP 70,000, where higher-rate tax is firmly in play and salary sacrifice, bonus planning, and job offer comparisons become especially important.
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How to use PayPath here
Run the relevant calculator for your live numbers, review the methodology if the assumptions matter to your decision, and save the strongest scenarios in the workspace if you are comparing more than one option.