The Biggest Change to UK Tax in a Generation Has Arrived
Making Tax Digital for Income Tax took effect on 6 April 2026.
Now, as the first quarterly filing deadline approaches, practices across the UK are seeing first-hand what quarterly reporting means for their clients, workflows and workload.
What Is MTD for Income Tax?
MTD for Income Tax replaces the traditional annual Self Assessment tax return for those within scope.
For those within scope, the traditional Self Assessment return is replaced by a Final Declaration submitted through the MTD process."
Instead of filing once a year, affected clients must now maintain digital records using HMRC-approved software and submit quarterly updates to HMRC.
After the tax year ends, they submit a Final Declaration (sometimes referred to as an MTD tax return), which brings together all income sources and finalises their tax position.
HMRC is not providing its own software for submissions. Every client within scope must use compatible commercial software, making your role as their trusted adviser more important than ever.
Who Is Affected and When?
MTD for Income Tax is being rolled out in three phases, based on qualifying gross income from self-employment and property combined:
- From 6 April 2026: Sole traders and landlords with qualifying gross income above £50,000 (assessed using 2024/25 tax returns)
- From 6 April 2027: Those with qualifying gross income above £30,000 (assessed using 2025/26 tax returns)
- From 6 April 2028: Those with qualifying gross income above £20,000 (assessed using 2026/27 tax returns)
It is important to note that qualifying income is gross income before expenses, not profit. Partnerships are not currently included, though HMRC has indicated they will be brought into scope at a future date.
What Are the Quarterly Submission Deadlines?
For the 2026/27 tax year, clients who follow standard tax quarters must submit updates by the following deadlines:
- 7 August 2026 for the quarter 6 April to 5 July 2026
- 7 November 2026 for the quarter 6 July to 5 October 2026
- 7 February 2027 for the quarter 6 October to 5 January 2027
- 7 May 2027 for the quarter 6 April to 5 April 2027
Clients who prefer calendar-quarter alignment can elect to use 1 April as their start date, provided their software supports this. The Final Declaration for 2026/27 is due by 31 January 2028.
HMRC has confirmed a penalty soft landing for the first year: penalty points will not be applied for late quarterly updates during the 2026/27 tax year, though penalties still apply for late Final Declarations and late payment of tax.
What This Means for Your Practice
The workload implications for accounting firms are substantial. Rather than managing one annual filing per affected client, practices must now oversee four quarterly updates, and a Final Declaration. Multiply that across a client base and the administrative volume increases dramatically.
However, this change also creates a genuine opportunity. Firms that embrace MTD as a platform for deeper, more frequent client engagement will be better positioned to deliver the kind of proactive advisory services that clients increasingly expect. Research shows that 60% of UK accountants already offer advisory services, and 41% plan to expand them. MTD creates a natural touchpoint for exactly that kind of ongoing conversation.
Five Practical Steps for Firms Right Now
- Audit your client base: Identify every client with qualifying gross income above £50,000 from the 2024/25 tax year. HMRC will have written to many of them, but your proactive outreach is essential.
- Review your software stack: Ensure the software your practice uses is fully MTD-compatible and can handle digital record keeping, quarterly submissions, and Final Declarations. TaxCalc's suite is built with exactly these requirements in mind.
- Educate your clients: Research shows that 26% of clients still use non-digital bookkeeping records. Help clients transition to digital record keeping now, and address barriers such as lack of digital confidence and resistance to change with patience and tailored support.
- Revisit your pricing: The increased frequency of submissions justifies a review of your fee structure. Many firms are moving to monthly or quarterly billing models that better reflect the ongoing nature of MTD compliance work.
- Prepare for 2027 and 2028: Even if your Phase One clients are now on board, begin identifying clients who will be caught by the £30,000 threshold in April 2027. Early preparation prevents last-minute scrambles.
The Wider Digital Transformation Picture
MTD for Income Tax sits within a broader government ambition to fully digitalise the UK tax system. Corporation tax digitalisation is expected to follow in due course. Firms that build robust digital workflows now will be far better placed to absorb future changes without disruption.
The gap between technology-forward practices and those slow to adapt is already widening. Firms that treat MTD as a catalyst for modernisation, rather than a compliance burden to be managed, will gain a significant competitive advantage in the years ahead.
How TaxCalc Can Help
TaxCalc has been supporting UK accounting firms through every stage of the MTD journey. Our software is fully compatible with MTD for Income Tax requirements, covering digital record keeping, quarterly updates, and Final Declarations. With intuitive workflows designed specifically for practice use, TaxCalc helps your team manage increased submission volumes without increasing stress.
Whether you are onboarding your first MTD clients or looking to streamline a practice already operating under the new regime, our team is here to help. Get in touch with TaxCalc today to find out how we can support your practice through MTD and beyond.
