The Sole Trader's Guide to Making Tax Digital for Income Tax

Being a sole trader has always required a bit of admin — keeping records, filing a Self Assessment return, paying tax by 31 January. From April 2026, that admin gets more structured and more frequent. Making Tax Digital for Income Tax brings quarterly reporting, digital record-keeping, and a new final declaration to anyone running a business with qualifying income above the relevant threshold.

For sole traders, MTD arrives at the same time as the basis period reform is still settling in. Together, they represent the biggest change to how self-employed people report tax in decades. If you have been running a simple business with clean 31 March year-end accounts, you are in a relatively good position. If your accounting date is something unusual — 30 June, 31 October, any other month — the complexity multiplies.

This guide covers the essentials for sole traders: the thresholds, the quarterly rhythm, the interaction with basis period reform, the categories you need to track, and the practical steps to take now. By the end you should know whether you are in, when you need to act, and what your priorities should be.

Are you in? The sole trader thresholds

MTD IT applies to sole traders based on qualifying income, which for trading businesses means turnover — before expenses are deducted. The thresholds are:

Start Date	Qualifying Income Threshold
6 April 2026	Over £50,000
6 April 2027	Over £30,000
6 April 2028	Over £20,000

Qualifying income combines your trading turnover with any gross rental income you have. A sole trader with £45,000 of business turnover and £7,000 of gross rent from a buy-to-let has qualifying income of £52,000 — over the first-wave threshold.

If you have multiple businesses, all their turnover figures combine. Two trades generating £28,000 and £15,000 respectively give you £43,000 of qualifying income. That is below the £50,000 threshold for the first wave but over the £30,000 threshold for the second wave. So you would not be in from April 2026, but you would be in from April 2027.

HMRC uses your 2024/25 Self Assessment return, due by 31 January 2026, to determine first-wave eligibility. Subsequent waves use the next year's return.

How the quarterly rhythm works

The core operational change MTD brings for sole traders is quarterly reporting. Four times a year, you submit a summary of your income and expenses to HMRC through MTD-compatible software.

The default "standard quarters" run from 6 April:

Quarter	Period	Deadline
Q1	6 April – 5 July	7 August
Q2	6 July – 5 October	7 November
Q3	6 October – 5 January	7 February
Q4	6 January – 5 April	7 May

You can elect to use calendar quarters (1 April to 30 June and so on) instead, which may suit your business better — especially if you already report VAT on calendar quarters. Deadlines are the same.

The figures in each quarterly update are cumulative, running from the start of the tax year to the end of the quarter. So your Q3 update covers everything from 6 April to 5 January, not just the 6 October to 5 January quarter on its own.

You can submit up to 10 days before the quarter ends if you are confident no more transactions are coming in. After the tax year ends, a final declaration is due by 31 January — this replaces the traditional Self Assessment return and brings in adjustments, reliefs, and other income sources.

Basis period reform: the other big change

Alongside MTD, basis period reform has moved all unincorporated businesses onto a tax-year basis. From 2024/25 onwards, sole traders are taxed on the profits arising in the tax year (6 April to 5 April), regardless of when their accounting year ends.

For businesses with a 31 March or 5 April year-end, this changes very little — their accounts already align with the tax year.

For businesses with other year-ends, the transition has been disruptive. In the 2023/24 transition year, many businesses were taxed on a longer period (often two accounting years overlapping the tax year), which sometimes produced substantially higher taxable profits. Spreading relief allows the transition profit (net of overlap relief) to be spread over five years (2023/24 to 2027/28) at 20% per year.

Going forward, a business with a non-31-March year-end will need to apportion profits between two accounting periods to calculate the tax-year profit. This is more complex than aligning the accounting date with the tax year.

For MTD, this matters because quarterly updates are to fixed standard quarters that do not align with any year-end other than 31 March or 5 April. If your accounting year is 31 October, for example, you have both the apportionment challenge at year-end and the misalignment of quarterly reporting through the year.

Should you change your accounting date?

One of the biggest decisions for sole traders approaching MTD is whether to change their accounting year-end to 31 March or 5 April. The benefits of alignment include:

• No apportionment of accounting profits between tax years.
• Quarterly MTD updates align naturally with your management accounts.
• Easier final declaration, with less year-end reconciliation.
• Simpler record-keeping overall.

The downsides include the one-off cost of preparing a transitional period of accounts, possibly bringing forward taxable profits, and the disruption of changing a settled rhythm.

Many sole traders who have resisted a 31 March year-end in the past are now finding the combined pressure of basis period reform and MTD is tipping the balance. If you are making this decision now, be aware that the spreading relief for transition profits was only available if the accounting date changed in the 2023/24 tax year. Changing later does not unlock the same relief.

Cash basis vs accruals

Cash basis has been the default for most small unincorporated businesses since April 2024. Under cash basis, income is recorded when received and expenses when paid — simpler than accruals, where transactions are recorded when earned or incurred.

For most sole traders, cash basis is a better fit for MTD. It aligns well with quarterly reporting because the date of each transaction is objective and easy to pin down. You can opt out to use accruals accounting if it suits your business better — for example, if you work with large invoice-driven contracts and want to recognise income when work is done rather than when paid.

Cash basis is automatically available for businesses with turnover up to the cash basis threshold. Above that, accruals is required.

What gets reported each quarter

For trading income, quarterly updates need to show:

• Business income — turnover and any other business income
• Cost of goods sold
• Subcontractor payments (including CIS deductions)
• Wages, salaries, and staff costs
• Car, van, and travel expenses
• Rent, rates, power, and insurance costs
• Repairs and maintenance
• Phone, stationery, and office costs
• Advertising and entertainment
• Bank interest paid
• Bank charges
• Accountancy, legal, and professional fees
• Other allowable expenses
• Consolidated expenses (if using three-line accounting)

The categories are familiar from the existing Self Assessment return, but MTD requires them to be populated four times a year rather than once.

Three-line accounting for sole traders

If your turnover is below the VAT threshold (currently £90,000), you can use a simplified "three-line accounting" approach — total income, total expenses, and resulting profit. This is easier to maintain than full categorisation.

For many small sole traders, three-line is the right choice. It meets MTD's requirements without demanding the same level of detail as a fully categorised set of accounts. For growing businesses, full categorisation has the advantage of producing better management information — you can see how much you are spending on travel, on subcontractors, on marketing — which is useful for running the business, not just for tax.

Preparing your sole trader business for MTD

The practical steps to take in the months leading up to MTD:

• Check your qualifying income. Combine trading turnover with any gross property income. If the total is anywhere near the relevant threshold, assume you are in.
• Choose MTD-compatible software. HMRC maintains a list on GOV.UK. For UK landlords and sole traders who want software designed for their specific situation, tools like LedgerLet are built with MTD in mind from the ground up.
• Consider your accounting date. If you do not already use 31 March or 5 April, weigh up whether changing now is worthwhile.
• Separate business and personal finances. A dedicated business bank account makes quarterly reporting dramatically simpler.
• Start recording transactions regularly, not just at year-end. MTD demands a quarterly rhythm; waiting until August 2026 to enter your April transactions will leave you scrambling.
• Talk to your accountant early. Many firms are restructuring their workflows around quarterly deadlines, and capacity will tighten as April 2026 approaches.

What happens if you also have property income?

Many sole traders also own rental property, often as a retirement plan or secondary income stream. For MTD purposes, trading and property income combine into one qualifying income figure.

If the combined figure is above the threshold, both sources become reportable under MTD — including property income that on its own would be too small to matter. A sole trader with £45,000 of trading turnover and £8,000 of gross rent has £53,000 of qualifying income, bringing them into the first wave. Both the trade and the property must be reported through MTD.

Each source is signed up separately under MTD (you or your agent register each one), but you only get one penalty points total across all your ITSA submissions.

Frequently Asked Questions

Q: I have turnover of £45,000. Am I in MTD from April 2026? A: Not based on that alone — the first-wave threshold is £50,000. But check whether you have any gross rental income, because qualifying income combines both. If your combined figure is still under £50,000, you will likely be brought in on 6 April 2027 when the threshold drops to £30,000.

Q: What if I have multiple businesses? A: All your trading turnover combines into a single qualifying income figure. Each business must be separately signed up for MTD, but you have one penalty points total for ITSA submissions across them all.

Q: Do I need to change my accounting year-end for MTD? A: Not strictly — you can keep any year-end you like. But if it is not 31 March or 5 April, you will need to apportion profits between tax years, and your management accounts will not align with your quarterly MTD reporting. Many sole traders are aligning to 31 March as they move into MTD.

Q: Can I still use a spreadsheet? A: Only if it is connected to MTD-compatible bridging software that submits to HMRC in the required format. For most sole traders, using cloud accounting software designed for MTD from the ground up is simpler and less error-prone than the spreadsheet-plus-bridging approach.

Q: What happens if my income drops below the threshold after I am already in MTD? A: You stay in MTD. To leave, you need to be able to show that your qualifying income has been below the threshold for three consecutive years, and only then can you claim exemption from year four onwards.

Conclusion

MTD for Income Tax will change how sole traders manage their admin, but it is not a crisis. The phased rollout gives most sole traders time to prepare, the soft landing on penalties in year one takes the edge off the transition, and the growing ecosystem of MTD-compatible software means you have genuine choice in how you implement it. The sole traders who come through this best will be the ones who started early, aligned their accounting dates where sensible, and built the quarterly rhythm into their working year before they had to.