Tax Guide for Self-Employed Carpenters
What expenses can a self-employed carpenter claim? CIS deductions, tools, van costs, timber — with a worked tax calculation and refund example.
Tax Essentials
- CIS Status
- Yes — 20% deduction
- Typical Income
- £30,000–£45,000
- HMRC Flat Rate
- £60/year (tools & clothing)
- VAT Threshold Risk
- Low risk
- Industry Body
- Institute of Carpenters
- Key Certifications
- CSCS card (Blue Skilled Worker or Gold Advanced Craft) · NVQ Level 2/3 in Carpentry & Joinery
Carpentry and joinery is construction work that falls under the Construction Industry Scheme (CIS). If you work as a subcontractor on site, your contractor deducts 20% from your payments and sends it to HMRC. At the end of the tax year, you file Self Assessment — and the expenses you claim often mean a significant refund.
Carpenters tend to spend heavily on power tools, timber for bespoke work, and van running costs. Every receipt matters, especially in the first few years when you're building up your kit.
What You Can Claim
| Expense | Examples | Typical Annual Cost |
|---|---|---|
| Tools & equipment | Cordless drill (Makita DHP486), circular saw (DeWalt DCS570), mitre saw, router, chisels | £500–£1,500 |
| PPE & workwear | Safety boots, knee pads, hi-vis, safety glasses, ear defenders | £200–£400 |
| Vehicle costs | Van fuel, insurance, MOT, servicing, road tax | £4,000–£6,000 |
| Materials & consumables | Timber offcuts, screws, nails, adhesives, sandpaper, saw blades (not supplied by client) | £500–£2,000 |
| Insurance | Public liability, tool cover | £150–£400 |
| Training & certifications | CSCS card renewal, NVQ assessment fees, first aid course | £100–£500 |
| Phone & apps | Mobile contract (business portion), job management apps | £150–£300 |
| Professional memberships | Institute of Carpenters, Federation of Master Builders | £50–£200 |
| Accounting fees | Tax return preparation, bookkeeping | £150–£400 |
Vehicle Costs
Most carpenters drive a van loaded with tools and materials — typically 80–90% business use. You can claim either the simplified mileage rate (45p per mile for the first 10,000, then 25p) or actual costs (fuel, insurance, MOT, repairs). At 12,000 business miles, the mileage method gives you £5,000. Once you pick a method for a vehicle, you generally stick with it.
Certifications That Count
- CSCS card — effectively required for site access. Blue Skilled Worker card needs NVQ Level 2 plus the CITB HS&E test (~£58 combined, valid 5 years)
- NVQ Level 2/3 in Carpentry & Joinery — if you're assessed on-site to upgrade your card, the assessment fee is deductible (~£850–£2,500)
- First Aid at Work — deductible if required for site access (~£100–£200)
- Working at Heights — deductible if needed for your projects (~£100–£200)
- Institute of Carpenters membership — deductible as a professional subscription
HMRC Flat Rate Alternative
HMRC allows a £60/year flat rate deduction for tools and specialist clothing instead of claiming actual costs. For most carpenters, actual tool costs alone run into hundreds. Claim the real figures with receipts.
Expenses You Can't Claim
- Commuting to a regular site — if you work at the same site for over 24 months, travel there isn't deductible. Travel between different sites and jobs is fine
- Everyday clothing — jeans and trainers don't qualify even if you only wear them for work. Only specialist PPE counts (steel-toe boots, knee pads, hi-vis)
- Your original carpentry qualification — your initial NVQ or City & Guilds to become a carpenter isn't deductible. Only renewals, upgrades, and CPD courses count
- Fines and penalties — parking tickets, PCNs, late filing penalties
- Food and drink — unless you're working away from your normal area overnight
Example: How Much Tax Does a Carpenter Pay?
Sarah works as a self-employed carpenter through CIS. Here's her 2025/26 tax year:
| Item | Amount |
|---|---|
| CIS income (gross) | £38,000 |
| CIS deducted (20%) | £7,600 |
| Allowable expenses | £7,000 |
| Taxable profit | £31,000 |
| Income Tax (after £12,570 personal allowance) | £3,686 |
| Class 2 NI (£3.50/week × 52) | £182 |
| Class 4 NI (6% on £12,570–£50,270) | £1,106 |
| Total tax + NI due | £4,974 |
| CIS already deducted | £7,600 |
| Refund due | £2,626 |
Without claiming expenses, her total tax + NI would be £6,794 and her refund would shrink to just £806. Expenses save Sarah £1,820 — the difference between a modest refund and a substantial one. You can claim back your CIS deductions through your Self Assessment return.
Record Keeping Tips
- Photograph receipts from tool suppliers — Screwfix, Toolstation, and timber merchants use thermal paper that fades within months. Snap every receipt on your phone the same day
- Log site visits and mileage daily — note the site address and miles driven. A mileage tracker app saves time, but a notebook works if you're consistent
- Save your CIS payment statements — you need these to reclaim the 20% deduction. Chase your contractor for any missing ones well before January
- Track tool purchases separately — keep a running list of power tools and their costs. If HMRC queries your claim, a detailed tool inventory is convincing
- Keep van expense records together — fuel, MOT certificates, service invoices, insurance renewals. Store digitally in one folder by tax year
Key Deadlines
| Deadline | What |
|---|---|
| 5 April | Tax year ends — finalise your income and expense records |
| 31 January | File Self Assessment and pay any tax owed (or receive your refund) |
| 31 July | Second payment on account (if applicable) |
If this is your first year filing, you need to register for Self Assessment by 5 October after the tax year ends.
This guide is for informational purposes only and does not constitute tax, legal, or financial advice. Tax rules change frequently. Always verify current requirements on GOV.UK or consult a qualified accountant for your specific situation.
Official Sources
- Expenses if you're self-employed — GOV.UK
- Construction Industry Scheme — GOV.UK
- Simplified expenses for vehicles — GOV.UK
- Self-employed National Insurance rates — GOV.UK