UK tax refund calculators — free, honest, private
Sixteen estimators covering the situations where UK taxpayers most often overpay. Each one runs entirely in your browser, shows the full arithmetic, states what it cannot know, and finishes by pointing you at HMRC's free claim route — never at a paid claims form.
Working on PAYE
PAYE tax refund
Estimate a PAYE tax refund from your P60 income and tax paid. See the full working, the limits of the estimate, and how to claim free from HMRC.
Free · no sign-up
P800 checker
Estimate whether HMRC's records are likely to show a P800 refund or an underpayment this year, and learn the free route to claim whichever it is.
Free · no sign-up
Income tax
Work out UK income tax for 2021-22 to 2026-27 with full band-by-band working, including Scottish rates and the £100,000 Personal Allowance taper.
Free · no sign-up
Tax code checker
Decode any UK tax code — 1257L, BR, D0, K, S/C prefixes, W1/M1 emergencies — see the allowance it implies and the warning signs of an error.
Free · no sign-up
Work expenses
Uniform tax rebate
Work out the tax relief on washing and maintaining a work uniform, using HMRC flat-rate expenses for up to four years back. Claim free.
Free · no sign-up
Mileage tax relief
Estimate mileage allowance relief on business miles in your own vehicle. Compare the 55p/25p approved rates (45p/25p before 2026/27) with what your employer paid. Claim free from HMRC.
Free · no sign-up
Tool tax relief
Estimate tax relief on tools and equipment you must buy for your job — flat-rate or actual costs — and claim free from HMRC, up to four years back.
Free · no sign-up
Professional fees
Estimate tax relief on membership fees to HMRC-approved professional bodies (GMC, NMC, RCN and hundreds more). Claim free, up to four years back.
Free · no sign-up
MOD mileage
Service personnel: estimate tax relief on journeys made in your own vehicle for duty, using HMRC approved mileage rates against what the MOD reimbursed.
Free · no sign-up
Working from home
Estimate tax relief at £6 a week for working from home — including the more generous 2020-21 and 2021-22 rules — and claim free from HMRC.
Free · no sign-up
CIS and self-employed
Family, savings and life changes
Marriage Allowance
Check eligibility and the saving from transferring £1,260 of Personal Allowance between spouses or civil partners — worth up to £252 a year, backdatable four years.
Free · no sign-up
Pension tax relief
Work out how much extra pension tax relief you can claim as a higher or additional-rate taxpayer on relief-at-source contributions — and how to claim it free.
Free · no sign-up
Leaving the UK
Moving abroad mid-year? Estimate the UK tax refund from your unused Personal Allowance and claim it free with form P85.
Free · no sign-up
Student loan refund
Repaid your student loan despite earning under the annual threshold? Estimate the refund for Plan 1, 2, 4, 5 or Postgraduate loans and reclaim free from the SLC.
Free · no sign-up
Married Couple's Allowance
Check the Married Couple's Allowance if you or your partner were born before 6 April 1935 — worth up to about £1,127 off your tax bill.
Free · no sign-up