MTD for Builders and Tradesmen —
Cash, Materials, and the CIS Overlap
Use gross figures — before materials, tools, van costs, or any other expenses are deducted.
If you're a self-employed builder, carpenter, plasterer, roofer, or any other trade running your own business, MTD applies to you on the same gross-income basis as any sole trader — but the construction trade has a couple of genuine quirks worth understanding clearly: how materials get treated, how cash jobs fit in, and how CIS interacts with your MTD obligation.
Your MTD Threshold as a Builder or Tradesman
| Tax Year Assessed | Threshold | MTD Start Date |
|---|---|---|
| 2024–25 | Over £50,000 | 6 April 2026. Live since April 2026 |
| 2025–26 | Over £30,000 | 6 April 2027 |
| 2026–27 | Over £20,000 | 6 April 2028 |
There are around 700,000 self-employed people working in UK construction, accounting for more than a third of the entire workforce in the sector — meaning this is one of the trades where MTD has the largest single impact. Many builders are used to managing their own books rather than using an accountant, which makes getting the digital record-keeping habit right from day one particularly important.
Materials — Why Your "Income" Looks Bigger Than It Feels
This matters because builders genuinely can hit the MTD threshold faster than their actual take-home profit would suggest, a tradesman doing material-heavy jobs (kitchens, extensions, bathroom fits) can cross £50,000 gross relatively easily, even while their real profit margin after materials, van costs, and tools is much lower. The threshold test is gross invoiced income, full stop — your software then lets you claim materials as an expense, which is what actually reduces your tax bill.
How MTD and CIS Work Together
Many builders and tradesmen work both directly for clients (where you invoice in full) and as a CIS sub-contractor for main contractors (where tax is deducted at source before you're paid). MTD and CIS are two separate systems that both apply to you simultaneously if relevant:
- CIS governs how the contractor deducts tax (usually 20% or 30%) from your payment before it reaches you — this is a payment-on-account system, not your final tax bill
- MTD governs how you report your overall self-employment income and expenses to HMRC through quarterly updates and a Final Declaration
- Your CIS income counts towards your MTD threshold using the gross figure — before the CIS deduction, not after
A sub-contractor who is paid £40,000 gross under CIS, with £8,000 deducted at source leaving £32,000 actually received, has £40,000 qualifying income for MTD purposes — the deduction is irrelevant to the threshold test, exactly as it is for direct client income.
Cash Jobs — No Different Treatment
What You Can Claim as a Builder or Tradesman
| Expense Category | Examples |
|---|---|
| Materials and supplies | Anything bought and used directly on a job for a client |
| Tools and equipment | Power tools, hand tools — often via capital allowances for larger purchases |
| Vehicle costs | Van fuel, insurance, maintenance, or simplified mileage rate |
| Insurance | Public liability insurance, essential and fully allowable |
| Trade association / scheme costs | CSCS card, trade body membership, Gas Safe registration where relevant |
| Protective clothing | PPE, branded workwear, safety boots |
| Admin costs | Mobile phone (business proportion), accounting software, stationery |
Practical Digital Records for a Busy Trade
The realistic challenge for builders and tradesmen isn't understanding the rules — it's finding time on a job site to log income and materials receipts properly. Approaches that work well in practice:
- Photograph every materials receipt at the till using your MTD software's mobile app, before it gets lost or faded in a van or toolbox
- Invoice promptly so income gets logged close to when the job happens, not reconstructed weeks later from memory
- Keep a simple job log noting client, job value, and materials cost per job — this makes quarterly categorisation far faster
- Separate your business bank account if you haven't already — mixing personal and trade spending makes digital record-keeping considerably harder under MTD than it needed to be under annual Self Assessment
For software suited to mobile, on-site record-keeping, see our full software comparison — and if your work is split between CIS sub-contracting and direct client work, see our dedicated MTD for CIS subcontractors guide for the CIS-specific detail.
Frequently Asked Questions
Do I count materials I buy for clients as my income?
Yes, if you invoice the client for materials as part of your overall charge, the full amount you invoice counts as gross income for MTD purposes — even though most of it passes straight back out as a materials expense. Materials cost is then claimed as an allowable business expense, which reduces your taxable profit but not your MTD qualifying income threshold.
How is MTD different from CIS for a self-employed builder?
CIS and MTD are separate systems that can both apply to you at once. CIS governs how contractors deduct tax at source from sub-contractor payments. MTD governs how you report your overall self-employment income and expenses to HMRC. If you work as a CIS sub-contractor, your gross CIS income before any deductions counts towards your MTD qualifying income threshold.
Does cash payment from a client count the same as a bank transfer or card payment?
Yes. All income counts towards your MTD threshold and must be recorded in your digital records regardless of how it was paid — cash, bank transfer, cheque, or card. There is no different treatment for cash jobs.
What expenses can a builder claim under MTD?
Standard self-employment allowable expenses apply: materials and supplies, tool and equipment purchases (often via capital allowances), van costs including fuel and insurance, public liability insurance, trade association membership, protective clothing, and a proportion of mobile phone and admin costs. These are claimed in the same categories under MTD as they were under the old Self Assessment system, just tracked digitally throughout the year.
I do small jobs for cash and big contracts through invoices — does my threshold combine both?
Yes. Your MTD qualifying income is your total gross self-employment income from all sources combined, regardless of job size or payment method. Small cash jobs and large invoiced contracts are added together to determine your threshold and phase.
Check Your Full MTD Position
Our free calculator checks your exact threshold, gives you your deadlines, and recommends mobile-friendly software for on-site record keeping.
Run Free MTD Check →