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.
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.
MTD for Income Tax is being rolled out in three phases, based on qualifying gross income from self-employment and property combined:
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.
For the 2026/27 tax year, clients who follow standard tax quarters must submit updates by the following deadlines:
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.
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.
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.
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.