Making Tax Digital for Income Tax (MTDIT) went live on 6 April 2026. If your practice has clients with gross income above £50,000, you have been living the reality of quarterly submissions, new workflows, and a very different kind of client relationship ever since.
But here is the thing: the hard work of the first wave is not the end of the story. It is the rehearsal.
From 6 April 2027, the income threshold drops to £30,000. That means a significant new cohort of sole traders and landlords will be mandated to join MTD for Income Tax, and many of them will be less digitally confident, less prepared, and more reliant on you to guide them through the transition than your current MTD clients were.
The practices that will handle this smoothly are the ones that start preparing right now, in the summer of 2026, not in February 2027.
The step from £50,000 to £30,000 brings a substantial number of additional taxpayers into scope. HMRC estimates that hundreds of thousands of sole traders and landlords fall into the £30,000 to £50,000 income band. For most practices, this means the second cohort will be larger than the first, not smaller.
And the challenge does not stop there. The threshold is set to fall again to £20,000 from April 2028, pulling in an even wider group of taxpayers. The direction of travel is clear: MTD for Income Tax will eventually touch almost every self-employed person and landlord in the UK.
If your practice has not already mapped out which clients fall into each income band, now is the time to do it.
Your first wave of MTD clients, those earning above £50,000, tended to be more established in their businesses. Many already had some form of digital bookkeeping in place. They were used to dealing with accountants regularly and were generally more financially literate.
The £30,000 to £50,000 cohort is often a different picture. This group frequently includes:
These clients will need more education, more hand-holding during onboarding, and more patient support as they build new habits around digital record-keeping and quarterly submissions. That takes time, and time is your most finite resource.
One of the most damaging things a practice can do is wait until early 2027 to tell clients they are in scope. Clients who find out six weeks before a filing deadline become a crisis, not a workflow item.
The summer and autumn of 2026 is the ideal window to begin proactive outreach to your £30,000 to £50,000 clients. Your communications do not need to be alarming. Keep the message straightforward:
Early communication does two things: it protects your capacity by spreading the onboarding work over many months, and it reinforces your value as a proactive, trusted adviser rather than a reactive compliance processor.
If you have been running your first wave of MTD clients since April 2026, you now have real data on what quarterly reporting actually costs your practice in time and effort. Use it.
Before the second wave arrives, carry out an honest capacity audit:
If the numbers do not add up, you have time to act. That might mean hiring, restructuring workflows, investing in better software, or having honest conversations about which clients your practice can realistically continue to serve at current fee levels.
The tools that carried you through the first wave may need reviewing before the second arrives. As your MTD client base grows, the efficiency of your software matters more, not less.
Ask yourself whether your current setup can handle a significantly larger volume of quarterly submissions without a proportional increase in staff time. Look for software that:
TaxCalc's MTD Quarterly Filer, for example, is designed precisely for practices managing multiple clients at different stages of digital readiness. Whether a client is using compliant software or a spreadsheet with bridging, the tool keeps your submissions standardised and your workflows scalable.
MTD for Income Tax fundamentally changes the economics of serving self-employed and landlord clients. What was once a once-a-year compliance task is now a year-round service with quarterly deadlines, ongoing client communication, and significantly more touch points.
If you have not already updated your pricing for MTD clients, now is the time to do so, before you onboard a new cohort at the wrong fee level.
Consider structuring your MTD service offering as a tiered package:
Anchoring your fees to the level of service and effort involved, rather than to what you charged for Self Assessment last year, protects your profitability and sets clear expectations with clients from the outset.
While your immediate focus should be on April 2027, it is worth keeping one eye on April 2028. The planned reduction to a £20,000 income threshold will bring the largest cohort of all into scope: part-time freelancers, micro-landlords, and small sole traders who may have very limited experience of formal accounting.
Start flagging these clients in your records now. You do not need to contact them yet, but knowing who they are means you can plan your capacity, your pricing, and your onboarding approach well in advance rather than scrambling when the mandate arrives.
It is easy to frame the expanding MTD rollout as a burden. The volume of work is real, and the pressure on practices is genuine. But there is another way to read what is happening.
MTD is forcing a deeper, more regular relationship between accountants and their clients. Quarterly touch points mean more opportunities to spot issues early, offer proactive advice, and demonstrate value beyond compliance. Practices that build efficient, scalable MTD workflows are not just surviving the change, they are positioning themselves to offer richer advisory services to a growing client base.
The firms that will look back on this period as a turning point are the ones that planned early, communicated proactively, invested in the right tools, and treated MTD not as a threat to manage but as a platform to build on.
The second wave is coming. The question is whether it finds your practice ready.