3 UK Money Checks I Run Before Saying Yes to a Pay Rise
Most salary conversations focus on one number: gross pay.
But when your pay crosses certain UK thresholds, your effective gain can be much smaller than expected.
I keep a simple checklist and run the same three calculations every time I get an offer, raise, or contract change.
1) Check for the GBP 100k tax trap first
In the UK, your Personal Allowance is reduced by GBP 1 for every GBP 2 earned above GBP 100,000.
That means in the GBP 100k-GBP 125,140 range, many people face an effective 60% marginal rate (before National Insurance and student loan effects).
So if your salary goes from GBP 99,000 to GBP 109,000, the headline increase can feel great, but the take-home uplift can be underwhelming.
Use this first:
Quick sanity check
If a raise puts you just into that band, options like pension salary sacrifice can sometimes improve outcomes more than a straight cash increase.
2) Model student loan repayments on the new salary
Many people estimate repayments with rough percentages and get it wrong.
For Plan 2 borrowers, repayments are based on income above the threshold, so higher salary usually increases monthly deductions immediately.
Before accepting a raise, I test both scenarios:
- current salary
- proposed salary
Then compare annual repayment difference:
This prevents the classic "I got a raise but my payslip barely moved" surprise.
3) Convert the raise into real (inflation-adjusted) terms
A 5% raise in a 4% inflation environment is not a 5% improvement in buying power.
Run a quick real-value check:
If your nominal pay is up but real pay is flat, that changes how you evaluate the offer - and how hard you negotiate non-cash benefits.
A practical decision framework
When I compare two offers (or old vs new salary), I track four values:
- Gross salary difference
- Net annual take-home difference after tax + loan effects
- Pension impact (especially if salary sacrifice is available)
- Real-terms gain after inflation
Only then do I decide whether the raise is genuinely meaningful.
Why this matters
Most people don't need more financial theory - they need a faster way to avoid bad assumptions.
That's why I built these calculators: quick, no-signup checks you can run in 2 minutes before making a decision.
No signup. No email capture. Just math.
Top comments (1)
Good checklist — the £100k trap catches so many people off guard because the 60% effective rate isn't visible anywhere on the payslip until you've already lost the allowance.
One addition: when I compare offers I always run both through a take-home calculator to get the net annual difference after tax + student loan, rather than trusting the gross figures. I run a free UK one at TakeHomePayPro (takehomepaypro.co.uk) — it handles the 100k taper and Plan 2/4/5 loan deductions automatically, which is exactly the maths in your checklist.