CIS refunds, van and tool expenses, mileage, materials, VAT reverse charge and MTD for Income Tax explained for self-employed UK flooring fitters.
For a self-employed flooring fitter, tax is rarely about a big bill at the end of the year. More often it is the opposite problem: money has already been taken off you under the Construction Industry Scheme, and the job at Self Assessment time is proving you were over-taxed and getting it back. A fitter laying carpet, vinyl, laminate, LVT or hardwood for builders, shopfitters and developers will see 20% sliced off every labour invoice before a penny of expenses is counted, and that money sits with HMRC until you file.
This guide is built around how flooring fitters actually earn and spend: CIS deductions and the refund they usually generate, the van, tools and materials that dominate your expenses, the mileage between jobs, and the gross-turnover traps that catch fitters who supply materials. Get the record-keeping right as you go and the annual return becomes a refund claim rather than a scramble.
As a sole trader you pay Income Tax on profit, which is your total income (labour plus any materials you invoice) 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 to create an effective 60% band. 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 flooring 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 a CIS deduction or a previous PAYE site job has distorted your code, run it through the tax code checker.
Most flooring fitting done for builders, developers, shopfitters and main contractors falls inside the Construction Industry Scheme. When a contractor pays you, they deduct tax from your labour and hand it to HMRC against your eventual bill. Crucially, this deduction is taken on labour before any expenses, so it almost always exceeds your real liability.
The single most valuable thing you can do is register for CIS so the deduction drops from 30% to 20%. The 10% difference is real cash flow withheld all year for nothing. Either way, you reconcile it at Self Assessment: you declare your gross income, deduct your expenses and personal allowance to find your real tax, then offset every CIS deduction already taken. The gap comes back to you. Our CIS subcontractor guide walks through registration, deduction statements and the refund process in full, and the CIS tax calculator estimates your repayment.
Keep the payment and deduction statement (sometimes called a CIS voucher) that each contractor must give you every month. Without these you cannot prove what was deducted, and HMRC will not credit deductions you cannot evidence.
Not all flooring work is CIS. Fitting carpet, vinyl or laminate directly for a private homeowner is outside the scheme, because a household is not a contractor. So is supplying flooring to a customer who fits it themselves. Many flooring fitters run a mix: CIS labour for trade clients and gross, undeducted payments from domestic customers. That mix matters, because the domestic income arrives with no tax taken off, so you must set money aside for it yourself rather than assuming a refund will cover everything.
If your gross self-employed income from all your fitting work is GBP 1,000 or less in a tax year, it is covered by the trading allowance, tax-free, with no need to register for Self Assessment. In practice almost any working flooring fitter blows past GBP 1,000 quickly, so this mostly matters for a brand-new starter doing the odd weekend job. Once over GBP 1,000 you must register and report everything. You can then deduct either the flat GBP 1,000 allowance or your actual expenses, whichever is larger, but for a fitter with a van, tools and materials the actual expenses are always far bigger, so claim those.
An expense is allowable when incurred wholly and exclusively for the business. A flooring fitter's costs are dominated by the van, tools and consumables, which is exactly why CIS over-deducts.
| Expense | What qualifies | Notes |
|---|---|---|
| Van running costs | Fuel, insurance, road tax, repairs, MOT, servicing, breakdown cover | Or claim simplified mileage instead, not both |
| Mileage | 45p per mile for the first 10,000 business miles, then 25p | Simpler alternative to actual van costs |
| Tools | Knee pads, knives, trowels, notched spreaders, hammers, levellers, floor stripper, undercut saw | Larger items via the Annual Investment Allowance |
| Consumables | Adhesives, grippers, screed, latex, underlay, blades, tape, sealant | Fully deductible as used on jobs |
| Materials | Carpet, vinyl, LVT, laminate, hardwood you supply | Record as both income (charged to customer) and expense |
| Protective clothing | Knee pads, safety boots, gloves, dust masks, branded workwear | Everyday clothing is never allowable |
| Insurance | Public liability, tools cover, van insurance | Essential trade cover is deductible |
| Trade memberships | CITB levy, NICF, flooring association fees | Allowable where relevant to the trade |
| Phone and admin | Business share of mobile, a fair home-office proportion for quoting and invoicing | Exclude private use |
| Training and CPD | Courses updating fitting or adhesive/subfloor skills | Training into a brand-new trade is not allowable |
| Accountancy and bank fees | Bookkeeping, Self Assessment, CIS refund filing, business banking | Fully deductible |
Your van is usually the biggest single deduction. You have two methods and must stick to one for that vehicle: claim a fair business proportion of actual running costs (fuel, insurance, tax, repairs, servicing), or claim HMRC's simplified mileage at 45p a mile for the first 10,000 business miles and 25p after that. A fitter racking up high mileage between distant sites often does better on the flat rate; one with an older van that costs a lot to keep on the road may do better on actuals. Work it out both ways once and use the winner.
When you buy flooring and charge it on to a customer, the amount you bill is income and the amount you paid is an expense. They roughly cancel out in profit terms, but both sides must appear in your records, and the income side counts towards your gross turnover for the MTD and VAT thresholds. This is the trap: a labour-and-materials fitter can show GBP 60,000 of turnover but only GBP 30,000 of profit, and the thresholds bite on the GBP 60,000.
Everyday clothing is never allowable, even hard-wearing trousers, because it is not protective equipment. The private share of your van, phone and any dual-use kit must be excluded. Fuel for the school run does not become deductible because the van also carries tools. And fines, parking penalties and the cost of your own lunch on site are not allowable.
Take a labour-and-materials fitter working mostly for a shopfitting contractor, with GBP 45,000 of income for the year, of which GBP 12,000 was materials charged on to clients. CIS at 20% was deducted from the GBP 33,000 of labour.
Income: GBP 45,000 (labour GBP 33,000, materials GBP 12,000)
Allowable expenses:
Taxable profit: GBP 45,000 minus GBP 18,800 = GBP 26,200
Income Tax: GBP 26,200 minus GBP 12,570 = GBP 13,630 at 20% = GBP 2,726
Class 4 NIC: GBP 13,630 at 6% = GBP 818
Total tax and NIC due: GBP 3,544. But CIS already deducted 20% of the GBP 33,000 labour, which is GBP 6,600. Against a real bill of GBP 3,544, that leaves a refund of roughly GBP 3,056. Run your own figures through the sole trader tax calculator to check, and the CIS calculator to estimate the repayment.
For a flooring fitter, the tax already taken under CIS is usually more than you owe. The refund is real money, but only if your van, tools and material costs are recorded and your deduction statements are kept.
You must register for VAT once taxable turnover exceeds GBP 90,000 in any rolling 12-month period. Labour-only fitters rarely reach this, but fitters who supply materials get there far faster because the material value inflates turnover. If you register and work as a CIS subcontractor in construction, the VAT domestic reverse charge usually applies: instead of charging your contractor VAT, they account for it themselves. You invoice without VAT, which helps the contractor's cash flow, but you can still reclaim VAT on your van, fuel, tools and materials, so reverse-charge subcontractors often sit in a regular VAT repayment position. Watch the rolling 12-month figure rather than the tax year, because turnover from materials can creep over GBP 90,000 mid-year without you noticing.
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:
For a flooring fitter the gross-income test is the catch. Because materials you charge on count as income, a fitter with GBP 35,000 of labour and GBP 20,000 of materials is at GBP 55,000 gross and inside MTD from April 2026, even though profit might be well under GBP 30,000. You will record each job, deduction statement and material purchase digitally as it happens and send HMRC a quarterly summary using compatible software. The upside is that capturing CIS deductions and expenses continuously makes your refund claim far easier than reconstructing a year of crumpled vouchers each January. Our guide to MTD for sole traders shows what the quarterly rhythm looks like in practice.
Staying unregistered for CIS. A 30% deduction instead of 20% means even more of your money is locked up with HMRC all year. Register and drop it to 20%.
Losing deduction statements. HMRC will not credit CIS deductions you cannot evidence. Keep every monthly payment and deduction statement from each contractor.
Ignoring domestic income because no tax was taken. Cash and bank-transfer jobs for homeowners are fully taxable and arrive with nothing deducted, so set money aside for them.
Recording materials only one way. Materials charged on are both income and expense. Recording just the cost understates turnover and can hide that you have crossed the MTD or VAT threshold.
Mixing van methods. You cannot claim actual van costs and mileage on the same vehicle. Pick one method per van and stick to it.
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