Joiners Tax Refund: What You Can Claim Back

A joiners tax refund comes from tax relief on work costs you pay yourself. Employed joiners can claim costs including the £140 flat rate expense and mileage to temporary sites. Self-employed and Construction Industry Scheme (CIS) joiners deduct costs on a tax return, and HMRC repays CIS deductions above the tax owed.

Site mileage has a catch. When a job you work at full time is extended past 24 months, the mileage stops qualifying from the day it’s extended, though the months before still count.

Your pay route shapes a joiners tax refund just as much. Two joiners hanging doors on one job can be on different systems. One is on PAYE (Pay As You Earn, with tax taken through a tax code); the other invoices a contractor who takes CIS deductions. Joiner tax relief doesn’t work the same for each.

You’ll find employed, CIS, agency and apprentice joiners covered here, and carpenters share the joiners’ £140 line, so a carpenter tax rebate isn’t any different.

What changes the answer is whether a site’s still temporary, whether you take the flat rate or keep receipts, and whether your yearly total goes over £2,500.

Your joiners tax refund starts with your payslip

Check how you’re paid before adding anything up. Tax taken through a tax code on your payslip points to PAYE employment for that work. A contractor’s monthly statements of what they paid and deducted point to CIS.

Each route reaches your money differently:

• On PAYE, you claim tax relief on costs your employer hasn’t paid back. HMRC usually gives this year’s relief through your tax code. For past years it either changes the code or refunds you.
• Under CIS, your costs come off your profit on a Self Assessment return, and HMRC sets the deductions already taken against your bill.
• With both in one year, the CIS work means filing a Self Assessment return, so your employed costs go on that return too rather than on a separate claim.

An apprentice joiner tax rebate goes through the same claim routes. Relief can’t be more than the tax you paid that year, so a year with little or no tax deducted limits what comes back.

The flat rate also depends on which industry line your job sits under, because some industries list apprentices separately.

The joiners flat rate expense needs no receipts

Joiners and carpenters appear on HMRC’s flat rate expense list at £140 a year, a fixed amount towards the clothing and tools you need for the job. Claim that figure and there’s nothing to send as proof.

Relief comes at the rate you pay tax, so £140 is worth £28 a year at 20% and £56 at 40%. Once HMRC accepts it, the flat rate usually carries into your tax code.

HMRC lets you claim one or the other: the flat rate, or what you actually spent with receipts to prove it. A year with a heavy spend on kit is where the second option earns its keep.

Tools come in two sizes. Repairing or replacing small tools, an electric drill for instance, sits under the same heading as the flat rate.

Substantial equipment you have to buy may qualify for relief on its full cost through the annual investment allowance, a type of capital allowance. To qualify, you need it for the work and make no significant private use of it.

The guide to tax relief on tools covers the evidence for bigger purchases.

Work boots are the bit that catches people out. For employees, GOV.UK gives safety boots as an example of specialist clothing.

Cleaning, repairing or replacing them may be claimable, but buying work clothing in the first place isn’t. Personal protective equipment (PPE) gets no relief at all, and HMRC says your employer should either supply it free or pay you back.

That’s the joiner protective clothing tax relief position for employed workers; the self-employed rules further down differ.

Joiner travel expenses tax relief stops at permanent sites

Driving from home to a temporary workplace counts as business travel. Driving to a permanent one is ordinary commuting, which gets no relief.

A site becomes permanent when you spend, or expect to spend, 40% or more of your working time there over a period that lasts or is expected to last more than 24 months. Both parts have to apply.

The expectation matters more than the months you’ve already put in. For a site you work at full time, HMRC’s travel guidance deals with building jobs directly:

• A job expected to take 18 months is a temporary workplace from your first day on it.
• If delays stretch the expected length beyond 24 months, relief ends from the date the expectation changed, with the earlier months still covered.
• A posting expected from the start to run longer than 24 months gets no relief, even if it finishes early.
• Coming back to the same site for a later phase can count as one continuous stretch, so a gap between phases doesn’t reset the clock.

A few working set-ups change the answer on their own:

• Being taken on for a fixed term to work at a single site for all or almost all of it rules out relief on travel there.
• A yard where you’re routinely handed your jobs is a permanent workplace, although calling in to pick up materials doesn’t by itself make it one.
• Through an agency or umbrella company, work similar to an employee’s counts as a separate job for each assignment. Travel from home to that site is commuting.

In your own van or car, you claim HMRC’s approved rate for each business mile minus anything your employer pays per mile. The rate covers owning and running the vehicle, and you can’t add fuel, repairs or MOTs on top. Each year’s figures are in the mileage allowance relief guide.

Travel to a temporary site also brings in public transport fares, parking, tolls, food and drink, and a hotel if the job keeps you away overnight.

One year’s claim can cross the £2,500 line

Take an employed joiner who drives their own van 6,000 business miles to temporary sites in 2026/27, gets 20p a mile from their employer and pays tax at 20%. Here’s how the claim builds:

1. Mileage at the approved rate comes to £3,300, which is 6,000 miles at 55p.
2. The employer’s 20p a mile adds up to £1,200, leaving £2,100 to claim.
3. Adding the £140 flat rate expense brings the year’s total to £2,240.
4. Relief at 20% on that total takes £448 off the year’s tax.

Because 2026/27 is the current tax year, HMRC would usually give that relief by changing the tax code rather than paying a refund.

Push the mileage to 7,000 and the total becomes £2,590. That’s over £2,500, so the same kind of claim now has to go on a Self Assessment return.

Earlier years work at the old rate. The 55p figure applies from 6 April 2026. Before that date the first 10,000 miles ran at 45p, so the same 6,000 miles in a backdated year gives £1,640 of expenses and £328 back.

Direct claims need evidence, flat rates don’t

Unless you already fill in a Self Assessment return, you claim a joiners tax refund straight from HMRC. GOV.UK’s claim tax relief for your job expenses page leads to an online service that checks whether you’re eligible and takes the claim. Form P87 is the postal version.

A direct claim works when your total for the year is £2,500 or less. Anything more than £2,500, or any year you’re in Self Assessment for another reason, goes on your tax return instead.

The evidence behind a joiners tax refund claim depends on what’s in it:

• Claiming only the flat rate expense means sending nothing else.
• A claim for tools or clothing at actual cost needs copies of receipts or other proof that you paid.
• A mileage claim needs a log giving the reason for every journey and the postcodes where it started and finished, with a separate log for each job.
• For a hotel stay or a meal, each receipt has to show the date and the business’s name.

Claims reach back as far as four earlier tax years, on top of the current one. Each claim has to reach HMRC within four years of the end of the tax year it covers.

Self employed joiner expenses come off your profit

Under CIS the contractor takes tax from the labour on each invoice: 20% if you’re registered and they can verify you, 30% if not. Nothing is deducted from VAT, plant hire or materials you paid for yourself. Gross payment status switches deductions off, leaving you to pay all your own tax.

Those deductions are advance payments towards your tax and National Insurance. Your Self Assessment return shows your pay before deductions, your allowable costs and the CIS already taken, and HMRC repays anything taken above what you owe.

The CIS tax refund guide covers registering and filing the return.

Your costs reduce your taxable profit rather than earning a separate relief, and several rules differ from the employed side:

• Protective clothing you need for the work is an allowable cost, though everyday clothing isn’t.
• HMRC’s flat rate expense list is for employees, so tools and clothing go in at what you actually spent.
• Travel between your business base and the sites you work on is usually allowable, while travel between home and a separate base isn’t.
• Your van can go in at actual running costs or at simplified mileage rates. Pick simplified rates for a vehicle and you’re locked into them while it stays in the business.
• Claiming the £1,000 trading allowance rules out claiming expenses.

Keep your records for at least five years after the 31 January filing deadline for the year.

Watch out for Making Tax Digital for Income Tax too. It applies to sole traders whose qualifying income is over HMRC’s threshold, and that threshold is coming down in stages.

For this test HMRC counts turnover from self-employment and property, before costs come off, not profit. Once you’re in, you keep your records in compatible software and send them to HMRC from it. HMRC writes to people it expects to join. If no letter arrives, it’s still your job to check, and some people qualify for an exemption.

The Making Tax Digital guide covers the software and exemptions in more depth.

Before you claim a joiners tax refund

Start with your payslip or CIS statements, because they decide the route. On the payroll, a joiners tax refund can come from the £140 flat rate or receipts for bigger spending, plus mileage to sites that still count as temporary.

Test each site against the 24-month expectation rule before adding its miles, and keep a log with postcodes for every journey. Total the year last: £2,500 or less can go through HMRC’s online service or form P87, while anything above it needs a Self Assessment return.

Under CIS, your costs come off your profit on that return and HMRC sets your deductions against the bill. For the expenses other trades on site can claim, see the construction workers tax rebate guide.

Key takeaways

• Employed joiners and carpenters can claim HMRC’s £140 flat rate expense each year without sending receipts.
• Mileage to a site stops qualifying once you expect to spend 40% or more of your working time there for more than 24 months.
• A direct claim covers yearly totals of £2,500 or less, and anything over £2,500 goes on a Self Assessment return.
• For cars and vans, the approved rate for the first 10,000 miles is 55p from 6 April 2026, up from 45p, so backdated years use the lower figure.
• CIS joiners get back deductions that exceed their tax and National Insurance bill through their Self Assessment return.