What can a self-employed electrician claim?
Cable and consumer units, the multifunction tester and its yearly calibration, NICEIC or NAPIT membership, the regs update course and the van all come off your profit before tax. Most of a domestic electrician's work is for homeowners, so nothing is deducted up front: here is what that means for the bill, and a worked year showing the payments on account that make the first January so expensive.
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What a self-employed electrician can claim
Cable, consumer units and accessories
Twin and earth, SWA, trunking and conduit, consumer units and the RCBOs in them, sockets, switches, downlights and the charge point you fit for a homeowner are all left behind in the customer's property. They belong in Goods for resale, and whatever you bill for them, including any mark-up on the wholesaler's price, is turnover. Stock in the van is deductible when you pay the wholesaler rather than when it is used, so a large order in March lands in that year's accounts.
Test instruments and calibration
A multifunction tester, a two-pole voltage indicator with its proving unit, an earth loop tester, a PAT tester and a thermal camera are the instruments your test results rest on. FileThat puts equipment under Repairs and maintenance, and the cash basis deducts the whole price in the tax year you buy one, a £1,200 tester included. Sending the instruments away for their yearly calibration is a running cost of the same kit, so it goes in the same box, as does a replacement set of leads and probes.
Hand tools, power tools and the drill
Insulated screwdrivers and side cutters, crimpers, an SDS drill and a wall chaser, a cable rod set, a fish tape and the step ladders sit alongside the instruments in Repairs and maintenance. Drill bits, chasing discs, cable ties, glands and tape are consumed as you go and are recorded as Other expenses. Hiring a scaffold tower for an outside light or a cable puller for a long sub-main is allowable for that job too.
Scheme membership and notifications
Belonging to a competent person scheme such as NICEIC or NAPIT is what lets the scheme notify your Building Regulations work to the council for you, rather than paying building control to inspect every consumer unit change. The annual fee, the assessment visit and the charge for each notification are all costs of trading, recorded as Other expenses. So is the exam fee when a new amendment to the wiring regulations comes out, because it keeps a skill you already sell current.
Training that updates, not training that starts over
Gov.uk allows courses that improve skills you already use, keep you up to date with the technology of your industry or cover changes in it. The wiring regulations amendment update, an inspection and testing refresher and a charge point course when you already install domestic circuits all count. What gov.uk refuses is a course that starts a new business or takes you into an area not directly related to your trade, so training from nothing to become an electrician is the cost of a new business, not an expense of running one.
Paperwork software, insurance and the van signwriting
The paperwork app that produces your test results and job sheets, estimating software and the business share of your phone are allowable, as is the accountant who files for you if you use one, recorded as Professional fees. Public liability, which the scheme requires, and cover for the instruments and tools in the van go under Insurance. Signwriting on the van, a website and a listing in a trade directory are Advertising costs. Safety boots, arc-rated gloves and eye protection for live testing go in Other expenses.
The rules behind every claim: allowable expenses for sole traders.
The van, the wholesaler and a dozen postcodes a week
A domestic electrician's miles are spread across a changing list of houses, with a run to the wholesaler most mornings, and that pattern is business travel from the moment you leave home, because home is where the trade is based. The claim for the van is one of two methods, chosen once for that vehicle: HMRC's flat mileage rates, 55p a mile for the first 10,000 business miles in the tax year and 25p after that, or the business share of what it really costs in fuel, servicing, insurance, tyres and repairs.
If you buy the van outright and deduct its price under the cash basis, you have chosen the real-cost method for that van and the flat rate is no longer available for it; the same is not true of a car, whose purchase is never deducted that way. Parking at the customer's house, the congestion charge and tolls are allowable on either method. A fine for parking on the pavement is not.
The exception is a long spell in one place. Most of a year on first and second fix at one block of flats for a developer can make that site the place the business is carried on, and the drive there and back ordinary commuting. Moving between homeowners' jobs never has that effect. In FileThat a mileage entry wants the date, the destination and the miles, and turns them into the deduction at HMRC's rate for you.
Which journeys count, and the van and car rule in full: can I claim mileage.
CIS and VAT
Homeowners are outside CIS
HMRC's own guide to the scheme, CIS340, says private householders are not contractors. Rewires, consumer unit changes, extra circuits, fault finding and charge points for the people who live in the house are paid in full, with nothing deducted, and the Income Tax and Class 4 National Insurance on that profit are paid through your return. You do not need to register as a CIS subcontractor while householders are your only customers, because registering only matters when a contractor pays you.
Builders, developers and the 20%
Work for a builder, a developer, a main contractor or a property company that does construction is inside the scheme. Wiring a new house, or a complete rewire on a refurbishment, is installing a power supply system, which is construction work, so they must take 20% off your labour, or 30% if you are not registered, and never off materials. Put the cable and consumer unit on their own line of the invoice; if they are not shown, the contractor may estimate what they cost and deduct on everything else. Your income is the gross figure, and the deduction on each monthly statement is entered in FileThat so it counts against the bill.
Solar panels, charge points and small jobs
HMRC's manual at CISR14090 says installing solar panels to generate electricity is within CIS unless the contract is directly with a private householder, so a roof of panels for a developer is caught and the same roof for the family living under it is not. Charge points are not named in the manual; fitted as part of wiring a new house they go in with the rest of the installation, and fitted for a homeowner they are outside like everything else the homeowner pays for. The manual also treats repairs and small extensions to a system, a single faulty circuit put right or a few extra sockets wired in, as outside the scheme on their own, though they are caught when they are part of a mixed contract of works that includes making good to the building.
Landlords, shops and VAT
A landlord letting flats or a shop having its lighting replaced is a business, but not a construction business, and only becomes a contractor once its construction spending passes £3 million in any 12 months, so nearly all of that work is paid in full too. If you are VAT registered and wire for a VAT-registered contractor under CIS, the reverse charge for building and construction services normally applies: the contractor accounts for the VAT and the sale is recorded as Construction industry - reverse charge sales. Your invoices to homeowners carry VAT in the usual way.
See what you could get back: the CIS refund calculator.
A domestic electrician's first bill and the payments on account
Take an electrician in England whose 2026-27 is almost all domestic: consumer unit changes, rewires, extra circuits and charge points for homeowners bring in £54,000, materials included, paid in full. One builder who is a CIS contractor pays £6,000 for first and second fix on two extensions, £1,000 of it shown as materials, so 20% of the £5,000 labour, £1,000, goes to HMRC and £5,000 reaches the bank. Turnover for the year is £60,000.
Expenses: £16,000 of cable, consumer units, accessories and charge points from the wholesaler; a £900 multifunction tester and £150 to have the instruments calibrated; £600 of hand and power tools; £600 for the scheme membership, its assessment and notifications; a £250 regs update course; £240 of paperwork software; £520 of insurance; £300 of the phone bill; 12,000 miles to customers' homes and the wholesaler, £5,500 for the first 10,000 and £500 for the next 2,000; £150 of boots, gloves and glasses; and £300 for the accountant. That is £26,010, so the profit is £33,990.
The Personal Allowance takes the first £12,570, leaving £21,420. Income Tax at 20% on that is £4,284, with Class 4 National Insurance at 6% adding £1,285.20, so the year's tax is £5,569.20. The builder's £1,000 is already with HMRC, so the balance to pay through Self Assessment is £4,569.20.
That balance is over £1,000 and the £1,000 taken at source is well under 80% of the tax, so HMRC also asks for two payments on account towards 2027-28, each half of the £4,569.20, which is £2,284.60. If this is the first year of trading, nothing was paid on account in advance, so the sum due by 31 January 2028 is the £4,569.20 plus the first £2,284.60: £6,853.80, with the second £2,284.60 due by 31 July 2028. From the second year the January figure settles down, because the payments on account made during the year come off it. Leave the £26,010 of costs unrecorded and the tax on £60,000 would be £13,888.60. Scottish Income Tax bands are different, so the figures there change slightly.
What you cannot claim
The trousers under the knee pads
Safety boots, arc-rated gloves and glasses for live testing are protective and allowable. Cargo trousers, a polo shirt and a fleece you could wear to the pub are ordinary clothes and stay private, unless they carry your business name.
The meal deal between jobs
A sandwich from the garage between a fault call and a consumer unit change is food you would have bought anyway. Meals count only when the work takes you away overnight or well outside your usual pattern.
Your own extension and your sister's garage
Cable and a consumer unit for your own house, or a sub-main run to a relative's garage for free, are private purchases however they were bought. Record them, mark them disallowable, and your profit stays right.
Fines, late tax and drawings
A ticket for blocking a drive, interest on tax you paid late, the money you take out to live on and the tax itself never reduce the profit.
The detail behind each: protective gear and everyday clothes, eating while you work and mileage and fines.
Straight answers
Is calibrating my multifunction tester tax deductible?
Yes. Calibration keeps an instrument you already own fit for the test results you sign, so it is a running cost of the business with no private element, allowable in the tax year you pay for it. Record it under Repairs and maintenance with the tester itself. The courier charge for sending the instruments away, and a hire tester to cover the week they are gone, are allowable in the same way.
Can I claim my NICEIC or NAPIT membership?
Yes. Scheme membership is a condition of notifying your own work and, for most domestic electricians, of getting the work at all, so the annual fee, the assessment visit and the per-job notification charges are all wholly and exclusively for the trade. Enter them as Other expenses, like any trade subscription. Renewing your ECS card is allowable too, in the same category. Keep each renewal invoice with the record, because HMRC can ask to see it.
Do I need to register for CIS if I only do domestic work?
No. Registration as a subcontractor exists so that contractors deduct 20% rather than 30% when they pay you, and a private householder is not a contractor, so while every customer is a homeowner there is nothing to register for and nothing is deducted. The moment a builder, developer or kitchen company starts paying you for wiring that forms part of their construction work, register before the first payment, or 30% of your labour will be held back instead of 20%.
Why is my first Self Assessment bill so much bigger than I expected?
Because the first bill usually carries half of the next year's tax on top. Once your Self Assessment bill is £1,000 or more and less than 80% of your tax was collected at source, HMRC asks for two payments on account for the following year, due 31 January and 31 July, each half of this year's bill. A domestic electrician has almost nothing taken at source, so the first January brings the year just finished plus half of the year under way, as the worked example above shows, and every year after that the payments already made come off the bill.
Is an EV charge point course allowable, and would a solar course be?
Both can be, because gov.uk allows training that develops new skills related to changes in your industry and refuses only courses that start a new business or move into an area not directly related to your trade. For a domestic electrician who already wires circuits, a charge point course or a solar PV course is an extension of the same trade. The refused case is the person with no electrical trade who pays for the training that would create one; that is the cost of setting up a business, not of running an existing one.
I bought a £9,000 van this year. Do I deduct it or claim mileage?
One or the other for that van. Under the cash basis the £9,000 is an expense in the year you pay for it, less a share for any private use, and from then on you claim the real running costs of the van, fuel, insurance, servicing and repairs, with a share taken off for any private use. Choose the flat rate instead and the purchase price is never deducted, but every business mile earns 55p or 25p with far less record keeping. Work out which gives more over the years you expect to keep the van, because the choice stays with it.
Do self-employed electricians have to use Making Tax Digital?
Yes, once your qualifying income passes the threshold. It has been £50,000 since 6 April 2026, and falls to £30,000 from April 2027 and £20,000 from April 2028. The measure is turnover, not profit: the cable and consumer units you charge on to customers count towards it, and so does the gross amount a contractor paid before CIS came off. HMRC decides from a tax return you have already filed, not from the year you are in, so a busy year brings you in from a later April rather than straight away.
Keep every claim, file it with HMRC
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