On Universal Credit you keep about 32p of every extra pound you earn. Not 55p — 32p, once Income Tax and National Insurance have taken their share first. That is a higher marginal rate than a millionaire pays. Put your own situation in below and see exactly what an extra shift, or a pay rise, is actually worth to you.
Why you keep so little
Universal Credit goes down by 55p for every £1 you earn above your work allowance. That 55p is taken from your pay after tax and National Insurance, not before — so the two stack up:
You earn an extra £100. Income Tax takes £20 and National Insurance takes £8, leaving £72. Universal Credit then drops by 55% of that £72, which is £39.60.
You keep £32.40. That is an effective rate of 68% — higher than the 45% top rate of Income Tax.
Below the tax threshold it is better, but not by as much as people expect: with no tax and no National Insurance to pay you still keep only £45 of every £100.
The work allowance almost nobody is told about
A work allowance is an amount you can earn each month before Universal Credit is reduced at all. There are two, and one very large catch:
- £710 a month if you have children or limited capability for work, and you do not get help with rent through Universal Credit.
- £427 a month if you have children or limited capability for work and you do get help with rent.
- Nothing at all if you have neither children nor limited capability for work. The 55% taper starts at the very first pound you earn.
The benefit cap, and the one threshold worth chasing
The benefit cap limits total benefits to £1,835 a month for couples and lone parents outside London (£2,110.25 in Greater London), or £1,229.42 for a single adult without children (£1,413.92 in London). It is frozen for 2026/27.
You are also exempt from the cap, whatever you earn, if you have limited capability for work and work-related activity, if you care for someone with a disability, or if anyone in your household gets PIP, DLA, Attendance Allowance or Carer’s Allowance. If your earnings have just dropped there is also a nine-month grace period.
The two-child limit is gone
Carer’s Allowance is a cliff, not a taper
This is the sharpest edge in the whole UK benefits system, and it is the one worth checking before you agree to any extra hours.
If you earn £204 a week or less after allowable deductions, you get the full £86.45 a week.
If you earn £204.01, you get nothing.
One penny costs you £4,495.40 a year. There is no taper, no partial rate and no warning — and because it is assessed weekly, a single extra shift in one week can do it.
Overpayments happen this way constantly: people drift over the limit without realising, and are asked to pay back months of Carer’s Allowance. If you are anywhere near £204 a week, check before you take the hours, and remember that some things can be deducted from your earnings first — ask the Carer’s Allowance Unit.
How this compares with the Republic
We model both systems, and they fail in opposite ways. In Ireland there are genuine cliff edges and dead zones — stretches where working more leaves a household with less money, and single euros that cost tens of euros. Universal Credit has neither: it tapers smoothly all the way, and on our figures there is no point at which working more makes you worse off.
What this does not do
This is a guide to the shape of the rules, not a decision. Only the DWP (or the Department for Communities in Northern Ireland) can decide your entitlement.
It models Universal Credit elements, the work allowance, the 55% taper, the benefit cap, Income Tax, National Insurance and the Carer’s Allowance earnings limit. The cap is applied to Universal Credit only — Child Benefit also counts towards it and is not modelled, so a capped household may lose slightly more than shown. It does not model childcare costs in detail, savings over £6,000, transitional protection when moving from old benefits, or sanctions. It assumes a standard Personal Allowance and tax code.
If you are close to the Carer’s Allowance limit, check with the Carer’s Allowance Unit or an adviser (Citizens Advice, or Advice NI) before you change your hours.
DWP — Benefit and pension rates 2026 to 2027 for the Universal Credit standard allowances and elements, the £710 and £427 work allowances, Carer’s Allowance at £86.45 and its £204 earnings limit. gov.uk — Universal Credit: what you’ll get for the elements and the two-tier health element from 6 April 2026. gov.uk — how your wages affect your payments for the 55p taper. gov.uk — Income Tax rates and National Insurance rates and thresholds for the 2026/27 tax figures.