MTD for Income Tax Is Live: What Your Firm Needs to Do Right Now

Making Tax Digital for Income Tax Has Arrived

After years of delays, consultations and revised timelines, Making Tax Digital for Income Tax Self Assessment (MTD ITSA) is finally live. From the 6th of April 2026, sole traders and landlords with total qualifying income above £50,000 are legally required to maintain digital records and submit quarterly updates to HMRC through MTD-compatible software.

If you are running an accounting practice in the UK, this is no longer a future concern. It is your present reality. The first quarterly update period (covering the 6th of April to 5th of July 2026) had a submission deadline of the 7th of August 2026. The regime is operational, HMRC is watching, and your clients are depending on you.

Understanding the Phased Rollout

MTD ITSA is being introduced in stages, giving practices time to prepare their wider client base. The current and upcoming phases are as follows:

• Phase 1 (from the 6th of April 2026): Sole traders and landlords with qualifying income above £50,000 are mandated.
• Phase 2 (from the 6th of April 2027): The threshold drops to £30,000, bringing a significantly larger group of clients into scope.
• Phase 3 (from the 6th of April 2028): The threshold is expected to reduce further to £20,000, capturing the majority of self-employed individuals and landlords.

Clients below the £30,000 threshold are not currently mandated, but they can sign up voluntarily. For practices looking to get ahead, encouraging early adoption among lower-income clients now can reduce the pressure as each new phase arrives.

What MTD ITSA Requires in Practice

For clients who are in scope, the obligations under MTD ITSA are more demanding than the old annual Self Assessment process. Here is what the regime requires:

• Digital record keeping: All income and expenses from self-employment and property must be recorded digitally using MTD-compatible software. Spreadsheets alone are not sufficient unless linked to a bridging tool.
• Quarterly updates: Clients must submit a summary of their income and expenses to HMRC four times per year. The four quarterly deadlines fall on the 7th of August, 7th of November, 7th of February, and the 7th of May.
• End of period statement (EOPS): At the end of the tax year, clients must submit a final declaration confirming the accuracy of their records and including any additional income sources.
• Final declaration: This replaces the traditional Self Assessment tax return and must be submitted by the 31st of January following the tax year end.
  
  

The Opportunity for Accounting Practices

While MTD ITSA creates additional administrative work, it also presents a genuine commercial opportunity for forward-thinking firms. Clients who were previously self-filing their annual return now need ongoing support throughout the year. This shift from a once-a-year compliance task to a quarterly service model opens the door to recurring fee arrangements and deeper client relationships.

Practices that position themselves as MTD specialists, offering to handle quarterly submissions on behalf of clients, are already seeing increased demand and stronger client retention. The key is to move quickly and communicate clearly with your client base before a competitor does.

How to Prepare Your Client Base for Phase 2

With Phase 2 just eight months away, now is the time to identify which of your clients will be caught by the £30,000 threshold from April 2027. Here are the steps your practice should be taking today:

• Review your client list: Pull a report of all sole trader and landlord clients with qualifying income between £30,000 and £50,000. These clients are not yet mandated but will be in April 2027.
• Make contact early: Do not wait until January 2027 to have the MTD conversation. Clients need time to understand the changes, adopt compatible software, and adjust their bookkeeping habits.
• Assess software readiness: Ensure your practice management and tax software is fully MTD-compatible and can handle the volume of quarterly submissions across your client base.
• Offer onboarding support: Many clients will struggle to adapt on their own. Consider offering a structured onboarding service to help them move to digital record keeping smoothly.
• Review your pricing: Quarterly submissions represent a significant increase in work. Make sure your fee structures reflect the new service model before clients assume the cost is included in their existing arrangement.
  
  

Common Pitfalls to Avoid

As Phase 1 beds in, a number of common issues are already emerging across practices. Being aware of these now can save your firm significant time and stress:

• Clients with mixed income sources: Clients who have both self-employment income and property income need to submit separate quarterly updates for each income stream. This is easy to overlook and can lead to incomplete submissions.
• Accounting period misalignment: MTD ITSA works best when the client's accounting period aligns with the tax year (6 April to 5 April). Clients with non-standard year ends may need to transition their accounting period, which requires careful planning.
• Missing the quarterly deadlines: HMRC's penalty regime for MTD ITSA is points-based. Clients accumulate penalty points for late submissions, and once they reach the threshold, a financial penalty is triggered. Keeping a clear diary of all quarterly deadlines across your client base is essential.
• Assuming bridging software is a long-term solution: Bridging tools that link spreadsheets to HMRC's API are technically compliant, but they introduce manual steps and the risk of error. For most clients, purpose-built MTD software is a more reliable and scalable approach.
  
  

How TaxCalc Supports Your MTD Journey

TaxCalc has been built with the demands of MTD ITSA in mind. Our software enables your practice to manage quarterly submissions efficiently, maintain a clear audit trail for each client, and stay on top of deadlines across your entire client base. With over 12,000 UK accounting practices already trusting TaxCalc for their tax return production and compliance work, you have a proven platform to support you through every phase of the MTD rollout.

Whether you are managing Phase 1 clients right now or preparing for the influx of Phase 2 clients next April, TaxCalc gives your team the tools to handle the increased workload with confidence.

The Bottom Line

MTD for Income Tax is not coming. It is here. The first quarterly deadline has passed, the next is in November, and Phase 2 is less than a year away. The accounting firms that will thrive through this transition are the ones that act now: identifying affected clients, communicating proactively, and building the processes and pricing structures to deliver quarterly compliance as a sustainable service.

The firms that wait will find themselves overwhelmed in the spring of 2027. The firms that prepare will find that MTD has made them indispensable to their clients all year round.