Are you a sole trader or landlord who still keeps your business records in a spreadsheet or a shoebox? From April 2026, that approach will no longer be acceptable for anyone with gross self-employment or property income above £50,000. Making Tax Digital for Income Tax (MTD ITSA) replaces the familiar annual Self Assessment return with quarterly digital submissions to HMRC, and the transition is closer than many business owners realise.

A common misconception is that MTD ITSA only affects large businesses. In fact, it targets exactly the sole traders, partners, and landlords who have historically managed their tax affairs through a single annual return. If your gross income from self-employment and property combined exceeds £50,000, you must comply from April 2026. If it falls between £30,000 and £50,000, your start date is April 2027. Those below £30,000 can volunteer early, but are not obliged to join until a future mandate.

Here is how the new rhythm works. You must use HMRC-approved software that connects directly to its API, recording every business receipt and expense digitally as they occur. Four times a year, you submit a summary of those figures to HMRC within one month of each quarter end, typically 5 August, 5 November, 5 February, and 5 May. After the fourth quarter, you submit a final declaration confirming the year's totals, and HMRC calculates the tax due on your annual profit. No more copying numbers from a spreadsheet onto a paper return.

What this means in practice for a typical business. Consider a freelance software developer earning £72,000 gross from contracts and £8,000 from a rental property. Under the old system, they filed one return each January. Under MTD ITSA, they will submit four quarterly updates plus a final declaration, all through software like FreeAgent or Xero. The software automatically categorises expenses, tracks mileage, and sends reminders. The quarterly deadlines are fixed, and HMRC has confirmed that late submissions will attract penalty points, eventually leading to financial penalties.

Key points for UK business owners to act on now:

  • Software is non-negotiable. HMRC will not accept Excel, paper ledgers, or PDF records for MTD ITSA. You need a compatible package. Monthly subscriptions typically range from £10 to £30, but many providers offer introductory pricing for the first year.
  • Limited companies are not yet in scope. If you trade through a limited company, MTD ITSA does not apply to you. However, MTD for Corporation Tax is expected to follow from 2026, so moving to digital records now is sensible preparation.
  • VAT-registered businesses have an advantage. If you already use MTD-compatible software for VAT, the same platform will handle your income tax reporting. This reduces duplication and keeps all your tax data in one place.
  • Quarterly deadlines are fixed and unforgiving. The first quarterly update for the 2026-27 tax year will be due by 5 August 2026. Missing it triggers a penalty point. Build these dates into your business calendar now.
  • An accountant who knows digital reporting is worth their fee. The shift to quarterly submissions changes the rhythm of tax planning. A good accountant will help you set up the software, check your quarterly returns, and ensure your final declaration matches your actual profit.

The takeaway for business owners: if your gross income from self-employment or property exceeds £50,000, you have roughly eighteen months to get ready. Choose your software, organise your digital record-keeping, and set up quarterly reminders. The days of the annual tax return panic are numbered, but only if you prepare for the new system now.