A pay rise is worth much less than the headline, and how much less depends on where you sit. A basic rate taxpayer keeps 72p of each extra pound, or 63p with a student loan. A higher rate taxpayer keeps 58p, or 49p with a Plan 2 loan. Between £100,000 and £125,140 the effective rate is 62%, so you keep 38p. Work out the real monthly figure before you commit to anything, and allocate it before it lands — a rise absorbed into ordinary spending is the most common way a good salary produces no change at all.
What the rise is actually worth
The instinctive calculation is to divide the increase by twelve. That is wrong by a wide margin, because the extra pay is taxed at your marginal rate — the rate on the top slice of your income, not the average across all of it.
| Where the extra pay lands | Deductions on it | You keep |
|---|---|---|
| Basic rate | 20% tax + 8% NI | 72p in the pound |
| Basic rate, Plan 2 loan | 20% + 8% + 9% | 63p |
| Higher rate | 40% tax + 2% NI | 58p |
| Higher rate, Plan 2 loan | 40% + 2% + 9% | 49p |
| £100,000 – £125,140 | 60% effective + 2% NI | 38p |
| £100,000 – £125,140, Plan 2 | 60% + 2% + 9% | 29p |
£204 a month is a perfectly good outcome. It is also not £417, which is what dividing £5,000 by twelve suggests, and the difference matters if you have already mentally committed the money to something.
The two traps worth knowing about
The 60% band
Between £100,000 and £125,140 the personal allowance is withdrawn at £1 for every £2 earned. Each extra pound is taxed at 40% and simultaneously exposes 50p of previously untaxed allowance to 40% tax, producing an effective marginal rate of 60% — 62% with National Insurance, and 71% with a Plan 2 loan on top.
A rise from £98,000 to £108,000 therefore delivers far less than it looks. Increasing pension contributions by salary sacrifice is the standard response, because reducing the income the taper is measured against restores the allowance. Whether that suits you depends on your circumstances and is worth discussing with a qualified adviser, but knowing the band exists is the prerequisite.
Losing something you were entitled to
Some thresholds are cliffs rather than slopes, and crossing one can leave a household worse off overall. The High Income Child Benefit Charge is the best known. Tax-Free Childcare and the funded childcare hours also have income limits. If you have children and your income is approaching a threshold, it is worth checking the household position rather than assuming more gross pay is automatically better.
Ask whether your pension contribution is a percentage of salary. If it is, a rise automatically increases the amount going in — which is good, and also means your take-home rises by less than the tables above suggest. That is not a deduction disappearing; it is money going somewhere useful. It is worth knowing, though, so the payslip does not surprise you.
Why most pay rises leave no trace
The reason a career of rises so often produces no improvement in financial position is not mysterious. Spending rises to meet income, quietly, within about two months, and it does so through decisions that are individually reasonable: a slightly better flat, a car upgrade, food delivery on a Tuesday because the week was hard.
None of these is a mistake. The problem is that they are recurring and the decision was made once. A £204 a month rise absorbed into a £150 a month increase in rent has been permanently spent, and the next rise will meet a higher baseline.
The counter is not austerity. It is deciding in advance where the increase goes, before it arrives and before it has been mentally allocated to something. The moment to do that is the month you are told about the rise, not the month it lands.
What to do with it
A rule that works for most people: split the real increase before the first payslip containing it.
Work out the real monthly figure
Not the headline divided by twelve. Run your old and new salary through a take-home calculator and take the difference. That is the number you are actually allocating.
Give at least half of it a job before it arrives
Increase the standing order to savings, or your pension contribution, dated for the first payday at the new salary. Money that never appears in your spending account does not need resisting.
Spend the rest deliberately
Allocating the whole rise to savings sounds admirable and rarely lasts, because a rise that changes nothing about your life is hard to sustain enthusiasm for. Half is a ratio people actually keep.
Where the saved half goes depends on what you have. If your emergency fund is thin, that comes first — the emergency fund calculator will show how much sooner you reach a buffer. If it is healthy, pension contributions are unusually efficient at higher rates, since a pound sacrificed at the higher rate costs you 58p of take-home, and 38p inside the 60% band. If you have expensive debt, clearing it beats both.
Why sacrifice is worth more the more you earn
Salary sacrifice reduces your contractual gross pay in exchange for an employer pension contribution, so it cuts income tax, National Insurance and student loan repayments alike. The higher your marginal rate, the better the trade.
This is why the advice to increase pension contributions with a rise is more than a platitude at higher incomes. Directing a rise into a pension inside the 60% band costs you 38p in the pound of forgone take-home, which is close to the best deal available in the UK tax system — and it is money you cannot reach until at least 55, rising to 57 from 2028, which is the trade-off to weigh.
And then re-run everything
A rise changes the denominator in every ratio you care about. Your savings rate as a percentage of income falls if the amount stays the same. Your committed costs as a share of pay improve, which may give room to fix something that has been tight. Your mortgage affordability changes if you are thinking about moving.
The practical step is to redo the monthly split with the new take-home figure rather than carrying the old plan forward with more slack in it. Slack is what gets absorbed.
Frequently asked questions
About earmarkIQ
earmarkIQ is a UK personal finance app for iOS and the web. It is an FCA Appointed Representative of Finexer Ltd (FRN 925695) and ICO registered (CSN2001882). It connects to UK bank accounts through read-only Open Banking, categorises spending automatically, builds a payday allocation plan, and tracks subscriptions, property equity and net worth. Website: earmarkiq.app