What Can Plumbers Claim as Expenses?
Self-employed plumbers can claim a wide range of business expenses against their income to reduce their tax bill. Every pound of legitimate expenses you claim saves you 20p in basic-rate tax or 40p if you are a higher-rate taxpayer.
This checklist covers 18 allowable expenses across 8 categories, each with the specific HMRC rule, typical amounts, and common mistakes to avoid. Tick the ones that apply to you to see your estimated tax saving.
Plumbers Expense Checklist
Materials0/2
Tools & Equipment0/4
Vehicle0/2
Professional0/3
Admin0/3
Marketing0/1
Work Clothing0/2
Training0/1
Your Estimate
Expense FAQs for Plumbers
Can I claim for tools stolen from my van?
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Yes. The cost of replacing stolen tools is a deductible business expense. You should report the theft to the police and get a crime reference number. If your tool insurance pays out, only claim the difference between the replacement cost and the insurance payout. Keep the police report and insurance correspondence as evidence.
Can I claim the cost of my plumbing qualification?
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Generally no. The cost of your initial NVQ or City & Guilds plumbing qualification is not deductible because it gave you a new skill rather than maintaining an existing one. However, refresher courses, CPD training, and additional certifications within plumbing (e.g. unvented hot water) are deductible because they update existing skills.
Can I claim for using part of my home as an office?
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Yes. If you use a room at home for admin, invoicing, or storing tools, you can claim a proportion of household costs (heating, electricity, council tax, mortgage interest or rent, broadband). The simplest method is HMRC's flat rate: £10/month if you work 25-50 hours at home, £18/month for 51-100 hours, or £26/month for 101+ hours. Alternatively, calculate the actual proportion based on rooms and time used — this often gives a higher deduction but requires more evidence.
What records do I need to keep as a self-employed plumber?
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You must keep records of all business income (invoices, bank statements) and all expenses (receipts, bills, mileage logs). Records must be kept for at least 5 years after the 31 January submission deadline for the relevant tax year. Digital records are accepted — HMRC does not require paper originals. Under MTD, your records must be kept digitally in compatible software. A simple system: photograph every receipt on your phone the same day, and record every job in your accounting software weekly.
See also: Plumbers Tax Guide — covers income tax rates, National Insurance, VAT, registration, and Making Tax Digital.