Making Tax Digital for Sole Trader Builders: Who Is Affected and When?

Making Tax Digital for sole trader builders became mandatory for the first group on 6 April 2026. If you run a building, fit-out, refurbishment or multi-trade business as a sole trader, the date you must join depends on your qualifying income.

The change is not simply about sending the same Self Assessment return through a different screen. Affected sole traders need compatible software, digital business records and quarterly updates.

The difficult part for many contractors will be keeping invoices, purchases and job references organised while several projects are live.

Who must use Making Tax Digital for Income Tax?

According to current HMRC guidance, you need to use Making Tax Digital for Income Tax when all of these apply:

• You are a sole trader or landlord registered for Self Assessment.
• You receive income from self-employment or property, or both.
• Your qualifying income is above the relevant threshold.

The phased start dates are:

• Qualifying income over £50,000 in the 2024 to 2025 tax year: MTD applies from 6 April 2026.
• Qualifying income over £30,000 in the 2025 to 2026 tax year: MTD applies from 6 April 2027.
• Qualifying income over £20,000 in the 2026 to 2027 tax year: MTD applies from 6 April 2028.

These thresholds relate to qualifying income, not profit after costs. A builder with £70,000 of sales and £45,000 of allowable expenses does not use the £25,000 profit figure for this test.

Income from self-employment and property is considered together. If you have more than one trade or property income, the relevant amounts are combined.

What if the construction business is a limited company or partnership?

MTD for Income Tax is currently aimed at qualifying sole traders and landlords.

A limited company is not brought into MTD for Income Tax simply because its turnover exceeds these thresholds. It remains subject to the tax and filing rules that apply to companies.

Partnerships are also not included in the current April 2026, 2027 and 2028 timetable. HMRC says partnerships will need to use MTD for Income Tax in future, but a start date has not yet been set.

The legal structure matters. Do not assume that every construction business over £50,000 is within MTD for Income Tax. Check the entity and income source with your accountant.

What changes for an affected sole trader builder?

An affected sole trader must keep digital records using compatible software and provide quarterly updates of business income and expenses to HMRC.

That means the bookkeeping cannot be treated as one annual sorting exercise. Records need to stay usable throughout the year.

For a project-based contractor, useful records normally include:

• Sales invoices and payment status.
• Supplier invoices and receipts.
• Subcontractor costs.
• Materials and plant purchases.
• Mileage and other business expenses.
• Credit notes and corrected invoices.
• The job, project or site connected to each transaction.

MTD reporting and job costing are not the same thing, but they depend on much of the same source information. When transactions are captured once and coded correctly, the accountant has cleaner tax records and the contractor has a clearer view of each job.

Why WhatsApp and month-end folders create problems

Many small contractors already use digital documents, but that does not necessarily mean they have a reliable digital record.

A receipt photographed into a WhatsApp chat, an invoice in a project manager's inbox and a cost entered on a separate spreadsheet are three disconnected records. Someone still has to identify the supplier, value, VAT treatment, job and date before the information is useful.

Under quarterly reporting, that clean-up cycle happens more often. Common problems include:

• Purchases with no job or site reference.
• Supplier invoices sent to several people.
• Missing credit notes.
• Personal and business spending mixed together.
• Sales invoices raised outside the main job record.
• Expenses stored on phones until the end of the quarter.
• Spreadsheet totals that cannot be traced back to source documents.

The answer is not to make site teams become bookkeepers. It is to make the basic capture process simple and consistent.

Making Tax Digital for sole trader builders: how to prepare

Start by agreeing the operating rules with the accountant who will handle the MTD filing.

Confirm which software will send information to HMRC, who owns each quarterly update, and which records must be available. BuilderDash is not HMRC-recognised MTD filing software and should not be described as making a business “MTD compliant”.

BuilderDash is job management software for project-based trades and construction businesses. Its role is earlier in the workflow: keeping enquiries, jobs, invoices, expenses and supplier information connected so clean records can pass to the accountant or accounting software.

A practical preparation process is:

1. Give every live job a consistent name or code.
2. Raise sales invoices from an agreed system rather than scattered templates.
3. Capture supplier invoices and expenses when they arrive.
4. Record the correct job or overhead category.
5. Resolve missing information weekly rather than at quarter end.
6. Reconcile the operational record with the accounting system.
7. Let the accountant review the first quarter's process before deadlines become tight.

This is also a good time to standardise the accounts workflow before automating it. Automation cannot reliably fix missing job references or unclear ownership.

Do not wait for an HMRC letter

HMRC may write to people it identifies as needing to use MTD, but the taxpayer remains responsible for checking.

Use the figures from the relevant Self Assessment return, check what counts as qualifying income, and speak to your accountant if the business structure or income sources are unclear. There are also exemptions in some circumstances, including forms of digital exclusion, but they should not be assumed without checking the rules or applying where required.

If you should have joined from 6 April 2026 and have not prepared, deal with it now. Confirm the filing software and agent arrangements, then work backwards through the records needed for the current quarter.

Build one usable record throughout the year

Making Tax Digital increases the cost of leaving financial records until the last minute. For sole trader builders, the practical response is to connect daily job administration with the records the accountant needs.

That means capturing income and expenses promptly, adding clear project references and resolving exceptions while the people involved still remember the transaction.

The BuilderDash features overview shows how jobs, invoicing, expenses, time tracking and suppliers can sit in one operational system. BuilderDash does not file MTD returns, but it can help maintain the clean, job-coded source records that an accountant or compatible accounting package needs.

The immediate question is simple: based on your legal structure and qualifying income, should you already be using Making Tax Digital for Income Tax, or do you need to prepare for April 2027 or April 2028?