Stonemason
Tax & MTD Guide

A self-employed stonemason sits squarely inside the construction trades, which means your tax life is shaped by two things that office-based freelancers never deal with: the Construction Industry Scheme (CIS) and a genuinely high spend on tools, kit and a working vehicle. Whether you are carving fresh ashlar for a new build, restoring a weathered church wall, fitting kitchen worktops, or laying memorial stone, the money usually arrives after a contractor has already lopped 20% off your labour and sent it to HMRC.

That single fact changes everything about your return. It means most stonemasons are owed a refund rather than facing a bill, but only if you record your expenses properly and reconcile the CIS deducted against what you actually owe. This guide covers how your profit is taxed, the specific expenses that matter in masonry, how CIS feeds your refund, National Insurance, VAT and the reverse charge, and when Making Tax Digital lands on your trade.

How Tax Works for a Self-Employed Stonemason

As a sole trader you pay Income Tax on your profit, which is everything you invoice (your labour plus any materials you supply) minus your allowable business 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, while Class 2 NIC is settled through Self Assessment.

The crucial point for a subcontractor is that CIS deductions are taken from your gross labour with no allowance and no expenses applied, so the 20% withheld is almost always more than your real liability. Scottish stonemasons pay Scottish Income Tax 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 masons have a C-coded tax code at rates currently matching the rest of the UK. If you also have a PAYE job or your code looks off, check it with the tax code checker.

CIS: Why Stonemasons Usually Get a Refund

If you work as a subcontractor for a building firm, a main contractor or a larger masonry business, the Construction Industry Scheme almost certainly applies. The contractor verifies you with HMRC and then deducts tax from your labour before paying you, passing it to HMRC against your eventual bill.

The mechanics matter for masons because your invoices often mix labour and materials. CIS is only deducted from the labour element, not from materials you supply at cost, so split them clearly on every invoice. Register as a CIS subcontractor to be deducted at 20% rather than the unregistered 30% rate. Keep every payment and deduction statement the contractor gives you, because these are your evidence at Self Assessment.

When you file, you add up all your CIS deductions for the year and set them against the Income Tax and Class 4 NIC you genuinely owe on your profit. Because the 20% was taken before allowances and expenses, the surplus is repaid. Our deeper guide to CIS subcontractors walks through verification, gross payment status and the year-end reconciliation, and the CIS tax calculator estimates your likely refund.

Allowable Expenses for Stonemasons

An expense is allowable when incurred wholly and exclusively for the business. Masonry is tool-heavy and physically demanding, so your deductions are dominated by equipment, the vehicle and protective kit rather than home-office costs. Recording them properly is what turns the CIS overpayment into a real refund.

Tools, Plant and the Annual Investment Allowance

Larger purchases such as a saw bench, a core breaker, a compressor or a quality grinder are capital items, but the Annual Investment Allowance lets you deduct the full cost in the year you buy them rather than spreading it. For a mason kitting out or replacing worn machinery, this can be a substantial deduction in a single year. Smaller hand tools and consumables are simply day-to-day running costs. Either way, the dust and abrasion in this trade mean tooling spend is genuinely high, so capture every receipt; lost receipts are lost refund.

The Van and Travel

Travelling between quarry, supplier, workshop and a string of sites is a core part of the job, and vehicle costs are usually one of the biggest deductions. You can claim either a fair proportion of actual running costs (fuel, insurance, repairs, road tax, finance interest) or the simplified mileage rate of 45p per mile for the first 10,000 business miles and 25p thereafter. Pick one method per vehicle and stick with it. Travel to temporary sites is allowable, but an ordinary commute to a regular base is not.

What You Cannot Claim

Everyday clothing is never allowable even if it gets ruined on site; only genuine PPE and protective or branded workwear count. The private share of dual-use costs (phone, broadband, the van used at weekends) must be excluded. Fines, parking penalties and the cost of your own meals on a normal working day are not deductible. And entertaining clients or contractors is specifically disallowed.

Worked Example: A Subcontractor Stonemason on GBP 52,000

Take a mason working mainly as a CIS subcontractor for two building firms, invoicing GBP 52,000 of labour across the year, all deducted at 20%.

Income: GBP 52,000 labour (CIS deducted at source: GBP 10,400)

Allowable expenses:

• Tools, blades and consumables (AIA and running costs): GBP 4,200
• PPE and protective workwear: GBP 700
• Van running costs and fuel: GBP 6,500
• Plant and scaffold hire: GBP 1,800
• Public liability and tool insurance: GBP 650
• Workshop share, phone and accountancy: GBP 1,750
• Total expenses: GBP 15,600

Taxable profit: GBP 52,000 minus GBP 15,600 = GBP 36,400

Income Tax: GBP 36,400 minus GBP 12,570 = GBP 23,830 at 20% = GBP 4,766

Class 4 NIC: GBP 23,830 at 6% = GBP 1,430

Total Income Tax and Class 4 NIC due: GBP 6,196. Against this sits GBP 10,400 already deducted under CIS, so the mason is owed a refund of roughly GBP 4,204 (before Class 2 NIC and any payments on account). Run your own figures through the sole trader tax calculator to sanity-check the profit, then the CIS calculator for the refund. This is why good expense records pay for themselves: every receipt you log lifts your refund pound for pound.

VAT and the Construction Reverse Charge

You must register for VAT once taxable turnover passes GBP 90,000 in any rolling 12-month period, which a busy mason supplying materials as well as labour can reach. Once registered, the domestic reverse charge for construction usually changes how you invoice other businesses in the supply chain.

When you invoice another VAT-registered, CIS-registered contractor for construction work, you do not charge them VAT. Instead your invoice states that the reverse charge applies, and the contractor accounts for the VAT on their own return. You still reclaim VAT on your tools, materials, hire and the van. The reverse charge does not apply when you bill a private homeowner direct (a memorial, a garden wall, a fireplace), where you charge VAT normally. Get this wrong and you either over-collect VAT you should not have, or under-account on work the customer was meant to reverse-charge, so flag clearly on each job which rule applies.

MTD for Income Tax: What Changes for Stonemasons

Making Tax Digital for Income Tax Self Assessment 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 not net of CIS:

• April 2026: Combined self-employment and property income over GBP 50,000
• April 2027: Over GBP 30,000
• April 2028: Over GBP 20,000

This catches a lot of subcontractor masons by surprise. Because the test is on turnover before expenses and before the 20% CIS deduction, your labour billed can cross GBP 50,000 even when your take-home profit is far lower. Instead of bundling a shoebox of receipts together each January, you record each invoice, tool purchase and CIS statement digitally as it happens and send HMRC a quarterly summary. For a trade with constant small purchases and CIS reconciliations, keeping records current actually makes your refund calculation cleaner. Our guide to MTD for sole traders shows what the quarterly rhythm looks like in practice.

Common Mistakes Stonemasons Make

Not registering for CIS and getting deducted at 30%. Registering drops the deduction to 20%, so you tie up less cash until your refund lands.

Mixing labour and materials on the invoice. CIS is only deducted from labour, so split materials out clearly or you will have too much withheld.

Losing tool and fuel receipts. In a trade this kit-heavy, every missing receipt directly shrinks your refund, not just your profit.

Claiming everyday clothing. Only genuine PPE and protective or branded workwear qualify; ordinary clothes ruined on site do not.

Forgetting Class 2 and Class 4 NIC. CIS covers Income Tax and Class 4 only towards your bill, so your refund must still leave the National Insurance you genuinely owe.

People also ask

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