Tax Guide for Self-Employed Electricians

Electrical work falls under the Construction Industry Scheme (CIS). If you work as a subcontractor, 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 can turn a tax bill into a refund.

Many electricians miss out by not claiming everything they're entitled to. This guide covers the expenses most relevant to your trade, with a realistic tax calculation.

What You Can Claim

Expense	Examples	Typical Annual Cost
Tools & test equipment	Multimeter, cable detector, drill, crimping tools, SWA cutters	£800–£2,000
PPE & workwear	Safety boots, hard hat, hi-vis, insulated gloves, knee pads	£200–£400
Vehicle costs	Van fuel, insurance, MOT, servicing, tyres	£3,000–£5,500
Certifications & training	Part P renewal, 18th Edition update, CSCS/ECS card	£300–£800
Insurance	Public liability, professional indemnity, tool insurance	£400–£700
Materials & consumables	Cable, trunking, back boxes, fixings (not supplied by contractor)	£300–£1,500
Phone & data	Mobile contract (business portion), job management apps	£150–£300
Accounting fees	Tax return preparation, bookkeeping	£150–£400

Vehicle Costs — Two Methods

You can choose between:

Simplified mileage rate: 45p per mile for the first 10,000 miles, then 25p per mile. No need to track fuel receipts — just log every journey with date, destination, and mileage.

Actual costs: Track every receipt — fuel, insurance, MOT, repairs, lease payments. If you use the van personally too, you claim only the business percentage. Typically 70-90% for an electrician's van.

Once you choose a method for a vehicle, you generally stick with it for that vehicle.

Certifications That Count

Part P qualification — fully deductible as a professional development cost
18th Edition Wiring Regulations (BS 7671) — deductible, including the IET book
CSCS/ECS card renewal — deductible
NICEIC registration fees — deductible as a professional membership
First Aid at Work certificate — deductible if required for site access

HMRC Flat Rate Alternative

HMRC allows a £60/year flat rate deduction for tools and specialist clothing instead of claiming actual costs. For most electricians, actual costs are much higher — claim the real figures with receipts.

Expenses You Can't Claim

Commuting to a regular site — if you work at the same location for more than 24 months, it becomes a permanent workplace and travel isn't deductible. Travel between different sites is fine
Everyday clothing — jeans and trainers don't count even if you only wear them for work. Only specialist protective or branded workwear qualifies
Initial training to become an electrician — courses before you started trading aren't deductible. Only ongoing professional development counts
Fines — parking tickets, penalty charge notices, HMRC late filing penalties
Food and drink — unless you're working away from your normal area overnight

Example: How Much Tax Does an Electrician Pay?

Sarah works as a self-employed electrician through CIS. Here's her 2025/26 tax year:

Item	Amount
CIS income (gross)	£42,000
CIS deducted (20%)	£8,400
Allowable expenses	£7,500
Taxable profit	£34,500
Income Tax (after £12,570 personal allowance)	£4,386
Class 2 NI (£3.45/week × 52)	£179
Class 4 NI (6% on £12,570–£50,270)	£1,316
Total tax + NI due	£5,881
CIS already deducted	£8,400
Refund due	£2,519

Without claiming expenses, Sarah's taxable profit would be £42,000, her tax + NI would be £8,881, and her refund would be just £81 — a difference of £2,438.

Record Keeping Tips

Photograph Screwfix and Toolstation receipts — thermal receipts fade within months. Snap them on your phone the same day or use the email receipt option
Log every site visit — note the site address and mileage. A simple notes app or mileage tracker works. You need this whether you use simplified rates or actual costs
Save CIS payment statements — your contractor should give you one for every payment. You need these to reclaim the 20% on your Self Assessment. Chase missing ones before January
Keep certification records — save invoices for Part P, 18th Edition courses, and NICEIC registration. These are often one-off annual payments that are easy to forget
Separate business and personal bank transactions — a dedicated business account makes it much easier to identify expenses at tax return time

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'll need to register for Self Assessment by 5 October after the tax year ends.

VAT Threshold

With typical earnings of £32,000–£45,000, some electricians approach the VAT registration threshold of £90,000 (2025/26). If your turnover (not profit) exceeds this, you need to register for VAT. Monitor your rolling 12-month turnover, especially if you take on larger jobs or supply materials.

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
Check if you need to register for VAT — GOV.UK