CIS deductions and refunds, van and tool costs, mileage, PPE, VAT and MTD for Income Tax explained for UK self-employed carpet and flooring fitters.
The tax picture for a carpet fitter is shaped by two things most office-based freelancers never deal with: the Construction Industry Scheme taking a slice of your money before it reaches you, and a steady outflow on a van, tools and consumables that genuinely add up. Get both right and you are usually owed money rather than chasing a bill.
A working fitter might spend Monday laying carpet on a new-build for a main contractor, who deducts CIS tax from the labour, then on Saturday do a supply-and-fit lounge for a homeowner who pays the full price in cash or card with no deduction at all. Those two jobs are taxed differently and recorded differently. This guide is built around how flooring fitters actually earn and spend, so the annual return becomes a refund claim rather than a headache.
As a sole trader you pay Income Tax on profit, which is your total fitting income minus allowable expenses. For 2025/26 the personal allowance covers the first GBP 12,570, then you pay 20% to GBP 50,270, 40% to GBP 125,140 and 45% above, with the personal allowance tapering away between GBP 100,000 and GBP 125,140. Class 4 National Insurance is 6% on profit between GBP 12,570 and GBP 50,270 and 2% above, with Class 2 NIC settled through Self Assessment.
Scottish fitters pay Scottish Income Tax on their profit through six bands (19%, 20%, 21%, 42%, 45% and a 48% top rate) and carry an S-prefixed tax code, while National Insurance stays UK-wide. Welsh fitters have a C-coded tax code at rates currently matching the rest of the UK. If you have a PAYE job alongside your fitting, or your code looks wrong, run it through the tax code checker so you are not over- or under-taxed at source.
The Construction Industry Scheme is the single most important thing a carpet fitter needs to understand. If you fit flooring as a subcontractor for a builder, shopfitter, developer or main contractor, that contractor must deduct CIS tax from your labour before they pay you and hand it straight to HMRC.
Because that 20% comes off the top with no credit for your personal allowance or your van, tools and mileage, it almost always takes more than your real tax bill. At Self Assessment you add up all the CIS tax deducted across the year, set it against your Income Tax and Class 4 NIC, and HMRC refunds the difference. A fitter with ordinary running costs typically gets a meaningful repayment. Our CIS subcontractor guide explains the scheme in full, and the CIS tax calculator estimates your likely refund.
Not every job is CIS. When a homeowner books you directly to supply and fit their carpet, you are usually selling to a consumer outside the scheme, so they pay you in full with nothing deducted. Many fitters run a mix, and the two streams must be kept apart in your records: CIS income arrives net of 20% with a deduction statement, while retail income arrives gross and you owe the tax on it later. The sole trader tax calculator handles the non-CIS side.
An expense is allowable when incurred wholly and exclusively for the business. For a fitter the list is dominated by the van, tools and consumables, which is exactly why CIS deductions tend to overpay your real liability.
| Expense | What qualifies | Notes |
|---|---|---|
| Van and vehicle costs | Fuel, insurance, road tax, servicing, repairs, finance interest, or simplified mileage | Pick one method and stay consistent for that vehicle |
| Hand and power tools | Knee-kicker, power stretcher, carpet and trimming knives, stair tool, bolster, hammer, seaming iron, knee pads | Usually claimed in full via the Annual Investment Allowance |
| Consumables | Gripper rods, underlay, adhesive, double-sided tape, seaming tape, threshold trims, edge bars, spray | Stock used on jobs is fully deductible |
| PPE and workwear | Knee pads, dust masks, gloves, safety boots, branded uniform | Protective clothing only; everyday clothes are not allowable |
| Tool and van insurance | Cover for tools in the van, goods-in-transit, breakdown cover | Business cover only |
| Public liability insurance | Cover against damage to a client's property | Essential and fully deductible |
| Phone and communications | Business share of mobile and data for bookings and quotes | Exclude the private proportion |
| Home admin and storage | Flat-rate home-working allowance, or a fair share of costs for quoting, invoicing and storing stock | Choose the larger fair deduction |
| Subcontractor labour | A second fitter or labourer you pay on a big job | If they are CIS, you may need to verify and deduct |
| Accountancy and CIS fees | Bookkeeping, Self Assessment, CIS return support | Fully deductible |
The van is most fitters' second biggest cost after tools. You can either claim a business proportion of all actual running costs (fuel, insurance, tax, servicing, repairs and finance interest), or use HMRC's simplified mileage rate of 45p a mile for the first 10,000 business miles in the year and 25p after that. Once you pick a method for a vehicle you must stick with it for as long as you own it, so do the sum once. High-mileage fitters criss-crossing a region often do better on mileage; those with an expensive van and lower mileage often do better on actual costs.
A power stretcher, seaming iron or a full kit refresh can be claimed in full in the year you buy it through the Annual Investment Allowance, rather than spread over years. Keep every receipt, including the steady drip of replacement blades, knee pads and small hand tools, because individually they look trivial but across a year they form a serious deduction that directly increases your CIS refund.
Ordinary clothing is never allowable even if you only wear it for work; only genuine PPE and branded uniform qualify. The private share of your van, phone and home costs must be stripped out. The fuel and time spent travelling from home to a regular fixed workplace can count as commuting rather than business travel, so keep a mileage log that records the job address for each trip.
Take a registered subcontractor whose labour invoices for the year total GBP 42,000, all paid by contractors under CIS with 20% deducted.
Income: GBP 42,000 labour (CIS tax deducted at source: GBP 8,400)
Allowable expenses:
Taxable profit: GBP 42,000 minus GBP 11,400 = GBP 30,600
Income Tax: GBP 30,600 minus GBP 12,570 = GBP 18,030 at 20% = GBP 3,606
Class 4 NIC: GBP 18,030 at 6% = GBP 1,082
Total Income Tax and NIC due: GBP 4,688. But GBP 8,400 of CIS tax was already deducted, so HMRC refunds GBP 3,712 (before any Class 2 NIC and student loan adjustments). That refund is the whole reason CIS fitters should file promptly. Run your own figures through the CIS tax calculator to estimate yours.
For a CIS carpet fitter the return is usually a refund claim, not a bill. Every tool receipt and every business mile you log puts more of that 20% deduction back in your pocket.
Your refund is only as good as your records. Keep every CIS deduction statement from each contractor, as these prove the tax already paid. Split labour and materials on every invoice so the right CIS deduction is applied. Photograph and file receipts for tools, consumables and fuel as you go, and keep a mileage log noting each job address. Separate your CIS jobs from direct retail jobs so the gross retail income is not forgotten. Doing this continuously, rather than in a January panic, is exactly what MTD will soon require anyway.
You must register for VAT once taxable turnover exceeds GBP 90,000 in any rolling 12-month period. Supply-and-fit fitters who buy the carpet, underlay and grippers and bill the customer for the whole job reach that threshold faster, because the materials count towards turnover, not just your labour. Labour-only subcontractors usually stay well below it.
If you do register and work for VAT-registered contractors, the construction services domestic reverse charge often applies, meaning you do not charge VAT on that labour and the contractor accounts for it instead. This commonly leaves CIS fitters in a regular VAT repayment position because they reclaim VAT on materials and tools while charging none on reverse-charge work. It is worth professional advice before registering, because the reverse charge trips up a lot of trades.
Making Tax Digital for Income Tax replaces the once-a-year return with quarterly digital submissions and a year-end finalisation. The thresholds are based on gross income, not profit, and crucially the gross figure is measured before CIS deductions:
A fitter invoicing GBP 55,000 of labour is in scope from April 2026 even though 20% was deducted at source and their profit is far lower. Instead of bundling a shoebox of deduction statements and fuel receipts together each January, you record income and expenses digitally as jobs happen and send HMRC a summary every quarter. For a trade that already deals with CIS paperwork all year, the continuous habit fits naturally. Our guide to MTD for sole traders walks through the quarterly rhythm.
Not registering for CIS. Staying unregistered means 30% is deducted instead of 20%, tying up more of your cash until you file. Register on day one.
Losing CIS deduction statements. Without them you cannot prove the tax already paid, and you risk being taxed twice on the same income.
Not splitting labour and materials. CIS should only be deducted from labour; lumping materials in lets a contractor over-deduct.
Forgetting non-CIS retail income. Direct homeowner jobs arrive gross with no deduction, so the tax is owed in full at year end and is easy to overlook.
Skipping small tool and consumable receipts. Blades, knee pads, tape and adhesive add up to a large deduction across the year that directly increases your refund.
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