MTDIT Is Here: How to Get Your Clients Ready for Phase Two

The Biggest Shift in UK Tax Reporting Has Arrived

Making Tax Digital for Income Tax Self Assessment (MTDIT) is no longer on the horizon. Phase One is already live. From April 6th 2026, sole traders and landlords with qualifying income above £50,000 are required to maintain digital records and submit quarterly updates to HMRC using compatible software.

For many accounting practices, the first wave of clients is already in scope. But with Phase Two arriving in April 2027, and a further expansion expected by the end of this Parliament, now is the time to get ahead of the curve rather than scramble to catch up.

This post sets out what your clients face, what your practice needs to do, and how the right software makes all the difference.

What MTD for ITSA Actually Requires

MTD for ITSA introduces three core obligations for affected clients:

• Digital record keeping: Clients must maintain digital records of all income and expenses relating to their self-employment and property businesses. These records must be kept in compatible software or on compliant spreadsheets.
• Quarterly updates: A summary of income and expenses must be submitted to HMRC every quarter. These are not mini tax returns but cumulative summaries, which means errors from earlier quarters can be corrected in subsequent submissions. The first quarter runs from the 6th of April to the 5th of July, with the update due by August 7th.
• Year-end declaration: After the fourth quarterly update, clients submit a final digital return that mirrors the current Self Assessment process. This is due by the 31st of January following the end of the tax year.

Clients with both a self-employment source and a rental property will need to submit eight quarterly updates per year, four for each income source. That is a significant increase in touchpoints, and it places real demands on both clients and practices.

Who Is in Scope and When

The rollout is phased based on qualifying income, which is the combined gross income from sole trade and property businesses before expenses:

• From April 2026: Individuals with qualifying income above £50,000
• From April 2027: Individuals with qualifying income above £30,000
• By the end of this Parliament: Individuals with qualifying income between £20,000 and £30,000 (date to be confirmed)

Qualifying income is assessed against the most recently filed Self Assessment return before the mandation date. For April 2026 entry, HMRC looked at the 2024/25 return filed by the 31st of January 2026. For April 2027 entry, it will be the 2025/26 return.

It is also worth noting that partnerships are not currently in scope, and MTD does not apply to limited companies. Clients who benefit from Rent a Room relief or the property and trading allowances do not count that sheltered income towards their threshold, though they may still be brought into MTD through other income sources.

The Practice Management Challenge

MTD for ITSA fundamentally changes the rhythm of practice work. Instead of one annual Self Assessment return per client, your team is now managing quarterly submissions across a growing client base. For a practice with 200 MTD-affected clients, that could mean hundreds of additional submission events each year.

There is no bulk sign-up facility with HMRC. Each client must be registered individually, which means practices need a clear, organised process for identifying in-scope clients, communicating with them, and managing sign-ups well in advance of their mandation date.

Practices that try to manage this with spreadsheets and manual processes will quickly find themselves overwhelmed. The firms that handle MTD well will be those with connected, automated workflows that surface the right tasks at the right time.

What to Do Right Now

Whether your clients are already in Phase One or approaching Phase Two, there are concrete steps your practice should be taking today:

• Identify all in-scope clients: Review your client list against the qualifying income thresholds. Do not wait for HMRC to notify them, many clients will not realise they are affected.
• Start the client conversation early: MTD changes how clients interact with their finances. They need to understand the quarterly rhythm, the digital record-keeping requirement, and what you will need from them at each stage.
• Review your software stack: Your practice needs MTD-compatible software that can handle quarterly submissions, link to bookkeeping data, and integrate with your wider workflow. Disconnected systems create unnecessary rework.
• Plan for the April 2027 wave: Clients with qualifying income between £30,000 and £50,000 are not in scope yet, but they will be in less than eight months. Getting them ready now avoids a last-minute rush.
• Consider calendar quarter elections: Clients whose accounting periods do not align with the tax year can elect to use calendar quarters (April to June, July to September, and so on). This can simplify bookkeeping for many clients, so it is worth discussing the option early.
  
  

How TaxCalc Supports Your Practice Through MTD

TaxCalc's MTD Quarterly Filer is designed specifically to help practices manage the new submission requirements without adding unnecessary complexity. It connects directly to your existing client data, supports cumulative quarterly updates, and integrates with bookkeeping platforms including Xero, QuickBooks and FreeAgent so that data flows through without manual rekeying.

Alongside the MTD Quarterly Filer, TaxCalc's practice management tools in Engager help you stay on top of every deadline across your client base. You can automate reminders, track quarterly submission tasks alongside your existing compliance workload, and give clients visibility through the secure client portal.

With over 12,000 UK practices already using TaxCalc, and more than 2.1 million tax returns filed through the platform in the last financial year, TaxCalc is built for the realities of running a busy UK accounting practice.

The Opportunity Inside the Challenge

MTD for ITSA is not just a compliance burden. For practices willing to embrace the change, it is an opportunity to deepen client relationships and move towards a more advisory, year-round service model.

Quarterly touchpoints create natural moments to review a client's financial position, flag tax planning opportunities, and provide proactive advice rather than reactive compliance. Clients who receive this kind of ongoing support are more engaged, more loyal, and more likely to refer others.

The practices that will thrive through MTD are those that use it as a reason to have better conversations with clients, supported by software that handles the administrative side automatically.

Ready to See How TaxCalc Can Help?

If your practice is navigating the MTD transition and looking for software that keeps everything connected, TaxCalc is worth a closer look. From quarterly submissions to full practice management, everything works together in one place.

Take a free trial or request a quote today at taxcalc.com.