Flat Rate Expenses Calculator
Find your HMRC flat rate expense allowance, calculate your tax saving, backdate your claim up to 4 years, and get step-by-step instructions to claim via P87 or Self Assessment. Covers 70+ occupations from EIM32712 for 2025/26.
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How to Use This Calculator
Find My Allowance tab
Search for your occupation using the dropdown—it covers 70+ occupations from HMRC’s official EIM32712 table. Select your income tax band (20%, 40%, or 45%) to see your annual flat rate allowance and exact tax saving. The calculator shows what you’d save at every tax rate for comparison.
Backdate Claim tab
Select your occupation, tax band, and how many years you want to claim. You can backdate up to 4 previous tax years plus the current year (5 total). The calculator shows a year-by-year breakdown and your total refund. Add any additional employment expenses (professional subscriptions, tools above the flat rate) to see the combined refund. If the total exceeds £2,500, you’ll need Self Assessment instead of the P87 form.
Claim How-To tab
Enter your total expenses amount to find out whether to use the simple P87 form or a Self Assessment tax return. The calculator gives step-by-step instructions for each route, including online, post, and phone options, plus links to the relevant GOV.UK pages.
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Every input is encoded in the URL. Click Share to send your exact scenario to a colleague, partner, or tax adviser.
The Formula
Flat rate expenses reduce your taxable income, not your tax bill directly. The tax saving depends on your marginal rate:
Example: £125 (nurse) × 20% = £25/year saving
Example: £1,022 (airline pilot) × 40% = £408.80/year saving
Backdated refund = Annual Allowance × Tax Rate × Number of Years
Example: £140 (police officer) × 20% × 5 years = £140 total refund
P87 threshold: Total expenses under £2,500 > use P87
Total expenses £2,500+ > use Self Assessment
HMRC sets these flat rate amounts based on the average annual cost of repairing, maintaining, and replacing uniforms, protective clothing, and small tools for each occupation. You do not need to keep receipts or prove the exact amount spent.
Example
Sarah — NHS Nurse, 34, Manchester
Sarah is a full-time NHS nurse who washes her own uniform at home. She is a basic-rate (20%) taxpayer and has never claimed flat rate expenses.
Find My Allowance
Backdate Claim (5 years)
Sarah claims £125 by submitting a P87 form online via her Government Gateway account. HMRC also adjusts her tax code so she gets the £25 relief automatically each future year.
Tom — Airline Pilot, 41, Surrey
Tom is a higher-rate (40%) taxpayer who has never claimed. His flat rate is £1,022 (one of the highest).
Tom receives a £2,044 refund by backdating 5 years. With the additional £110 travel expenses deduction (EIM50050), his total could be even higher.