From Spreadsheet to Quarterly Updates: A Sole Trader's Roadmap Through MTD for Income Tax in 2026

For a large number of sole traders, the most significant administrative change in a decade took effect quietly at the start of the current tax year. Since 6 April 2026, self-employed individuals and landlords with qualifying income above £50,000 have been required to keep their business records digitally and to send quarterly updates to HMRC.

As of today, 7 November 2026, the second quarterly update of the 2026-27 tax year is due. For anyone still running the business from a shoebox and an annual spreadsheet, the change is less about tax and more about rhythm.

The change, in one paragraph

Making Tax Digital for Income Tax Self Assessment replaces the single annual return with four summary updates during the year plus an end-of-year final declaration. The records underpinning those updates must be kept in digital form, and the updates must be submitted from software compatible with HMRC's systems. Nothing about the underlying tax calculation changes.

Who is actually affected

The test is qualifying income, not profit. Broadly, it is the combined gross income from self-employment and from property, before expenses are deducted. That distinction catches people out. A trader with £40,000 of self-employment income and £15,000 of rental income is over the line at £55,000, even if their actual profits are modest.

HMRC identifies affected taxpayers from recent self assessment returns rather than relying on self-nomination, but the obligation to comply rests with the taxpayer. Letters have been issued over the past eighteen months, and anyone who has ignored one should not assume the matter has gone away.

Below the threshold, the requirement is not yet live. From April 2027 it extends to those above £30,000, and from April 2028 to those above £20,000. Partnerships and limited companies are outside this particular regime for now — companies remain within corporation tax. Those under the threshold may still choose to join voluntarily, which some do in order to settle into the system before it becomes compulsory.

What does not change

The amount of tax owed. The payments on account, still due on 31 January and 31 July. The overall filing calendar for anything outside MTD. MTD alters how income and expenses are reported, not how they are taxed, and any suggestion that quarterly updates replace tax payments is a misunderstanding worth correcting early.

The new reporting rhythm

For the 2026-27 tax year, the key dates are:

• 7 August 2026 — first quarterly update, covering 6 April to 5 July 2026
• 7 November 2026 — second quarterly update, covering 6 July to 5 October 2026
• 7 February 2027 — third quarterly update, covering 6 October 2026 to 5 January 2027
• 7 May 2027 — fourth quarterly update, covering 6 January to 5 April 2027
• 31 January 2028 — final declaration for the 2026-27 tax year

Each quarterly update is a summary of totals, not a full return and not a payment. In practice it takes minutes once the records are in order — which is precisely why the record-keeping is the part that matters.

What counts as a digital record

The requirement is that records are kept digitally and that updates are sent from compatible software. Photographing a receipt into an app, or capturing an invoice directly into an accounting package, satisfies this. Keeping paper receipts in a drawer and typing the annual totals into a spreadsheet in July generally does not — unless the spreadsheet itself is the digital record and bridging software is used to submit from it.

Three practical habits make the difference. Use a separate bank account for the business, however small the business is. Categorise transactions monthly rather than annually, because three months of unexplained entries is a far harder task than one. And keep the digital trail intact — deleting a source document after entry is exactly what an HMRC enquiry would ask about.

Choosing software without overpaying

HMRC publishes a list of compatible products, and it is longer and more varied than many traders expect. Three rough tiers exist.

Full accounting packages handle invoicing, bank feeds, VAT and payroll, and typically cost between £15 and £40 a month. They are the right answer for a growing business with employees, stock or VAT registration.

Lightweight MTD-specific products do little beyond recording income and expenses and filing the updates. For a sole trader with one trade, a modest expense list and no VAT, these are frequently sufficient and considerably cheaper.

Bridging software connects an existing spreadsheet to HMRC's systems. It is the least disruptive option for someone with an established, well-maintained spreadsheet, and often the cheapest.

Four questions sort most of the market. Does the product handle both self-employment and property income, if you have both? Can your accountant or agent access it directly? Can you export your data if you decide to leave? And what is the total annual cost, including any per-return or per-client charges? Free options do exist, though they tend to suit the simplest affairs.

A readiness checklist

1. Confirm your qualifying income and whether you are in scope for 2026-27.
2. Check whether HMRC has already written to you, and respond if it has.
3. Open a dedicated business bank account if you do not already have one.
4. Shortlist two or three compatible products and trial one with dummy data.
5. If you use an accountant, confirm in writing who is filing what.
6. Set up agent authorisation so both parties can see the account.
7. Diarise the four update dates and the final declaration date.
8. Reconcile your records monthly, not quarterly.
9. Submit the first update a week early to flush out problems.
10. Budget for the January and July payments on account exactly as before.

Common pitfalls

Confusing updates with payments. The quarterly update is a report. The bill still arrives under the old schedule.

Assuming the accountant has it covered. Accountants generally will, but only where the engagement letter says so and only where records reach them in usable form.

Missing the final declaration. The four quarterly updates do not complete the year. The declaration by 31 January 2028 does, and it is the step most likely to be overlooked after a year of routine filing.

Leaving everything to the deadline. The quarterly rhythm rewards small, frequent effort and punishes deferral far more harshly than the annual return ever did.

Buying software sized for a larger business. A reporting obligation is not a reason to purchase a payroll or inventory system.

Ignoring the exemption route. Where someone genuinely cannot use digital tools — for reasons of disability, age or remote location, or on religious grounds — HMRC has a process for applying for exemption. It is narrow, but it exists and should be used rather than assumed.

The bottom line

MTD for Income Tax is a change of habit more than a change of tax. Traders who already keep tidy digital records will barely notice it. Those who do not have roughly two choices: build the habit now, at a manageable pace, or rebuild it under deadline pressure in February.

HMRC's own guidance, the published software list and a short conversation with an accountant remain the most reliable starting points. The deadline for the current quarter is today, which makes this a reasonable week to begin.