MTD for Income Tax: your 90-day plan for a confident start
Build a phased plan to get your practice and clients ready for MTD for Income Tax.
Written by Ebony-Storm Halladay — Freelance accounting copywriter, 10 years. Read Ebony's full bio
Published Friday 10 July 2026
Table of contents
Key takeaways
- Making Tax Digital for Income Tax (MTD for ITSA) requires sole traders and landlords with qualifying income above £50,000 to submit quarterly updates from April 2026, with the threshold dropping to £30,000 in April 2027 and £20,000 in April 2028.
- Qualifying income is the combined gross income from self-employment and UK property; partnerships, companies, and trusts are not currently in scope.
- A phased 90-day plan covering client triage, software setup, and process testing gives your practice a structured path to readiness without last-minute pressure.
- HMRC's points-based penalty system allows a reset once your client submits on time for 12 months and clears any outstanding submissions from the prior 24 months, so building reliable filing habits early protects your clients from cumulative fines.
What is MTD for Income Tax and who must comply?
Making Tax Digital for Income Tax Self Assessment (MTD for ITSA) replaces the annual Self Assessment return with quarterly digital updates and a year-end Final Declaration. Hundreds of thousands of sole traders and landlords are affected by the first phase, which launched in April 2026.
Qualifying income is the combined gross income from self-employment and UK property before any deductions. The threshold sits at £50,000 for 2026, drops to £30,000 in April 2027, and is expected to fall again to £20,000 from April 2028. Partnerships, companies, and trusts are not in scope.
Clients can also check their eligibility on GOV.UK if they're unsure whether their income crosses the threshold. Those below the current threshold can sign up voluntarily, which is worth considering for clients who want to test the process before it becomes compulsory.
When do quarterly updates start and what changes in 2026 and 2027?
The first quarterly update period runs from 6 April to 5 July 2026, with a submission deadline of 7 August 2026. Each quarter follows the same pattern, giving your practice roughly one month after the period ends to review, reconcile, and submit.
Here's how the reporting calendar looks for the 2026–27 tax year:
- Quarter 1: 6 April – 5 July 2026, deadline 7 August 2026
- Quarter 2: 6 July – 5 October 2026, deadline 7 November 2026
- Quarter 3: 6 October 2026 – 5 January 2027, deadline 7 February 2027
- Quarter 4: 6 January – 5 April 2027, deadline 7 May 2027
The Final Declaration for the 2026–27 tax year is due by 31 January 2028. This replaces the traditional Self Assessment tax return and confirms the client's total income and tax liability for the year.
From April 2027, the income threshold drops to £30,000, which means a second wave of clients will need onboarding. Planning for that expansion now saves your practice from running two parallel setup exercises.
What goes into your first 90-day plan?
A structured 90-day plan breaks preparation into three phases, each lasting roughly 30 days. This approach lets you spread the workload across your team and avoid a scramble in the weeks before the first deadline.
Phase 1: identify and triage (days 1–30)
Start by identifying every client whose qualifying income sits above the current threshold. Cross-reference Self Assessment records with your practice management data to build a complete list.
Once you have that list, triage clients into priority groups based on complexity. A sole trader with straightforward income needs less lead time than a landlord with multiple properties and mixed income sources. Use this triage to set a realistic onboarding schedule for the next two phases.
This is also the point to set up agent authorisations through HMRC so you can act on each client's behalf. Getting authorisations in place early prevents bottlenecks when you're ready to submit.
Phase 2: set up and connect (days 31–60)
Move into software configuration. Connect each client's bank feeds, categorise income and expense types, and set up the chart of accounts within your accounting software. Standardising your setup across clients saves time and reduces the chance of inconsistent records.
If a client isn't already on MTD-compatible software, now is the time to migrate. Use HMRC's sign-up process to register each client for MTD for Income Tax once their software is in place.
Run a reconciliation check at the end of this phase. Confirm that transactions are flowing correctly and that the categories match what HMRC expects in a quarterly update.
Phase 3: test and refine (days 61–90)
Submit a test quarterly update using real data from the current period. This dry run reveals any gaps in your process before the first compulsory deadline arrives.
Review the submission with your team. Note where the workflow slowed down, which clients needed extra support, and whether your internal deadlines gave enough buffer. Adjust your standard operating procedure based on what you learn.
By the end of phase 3, you should have a repeatable process, a trained team, and a set of clients who understand what's expected of them each quarter.
How to set up MTD for Income Tax processes that scale
Individual client setups are manageable, but the real challenge is building a workflow that holds up when you're filing for dozens or hundreds of clients in the same window. Scalable processes depend on consistency, automation, and clear internal deadlines.
Consider these building blocks for a scalable MTD workflow:
- Create a standard onboarding checklist that every client follows, covering bank feed connections, category mapping, and HMRC sign-up
- Set internal deadlines at least two weeks before HMRC's submission date to allow for review and corrections
- Use Xero HQ to monitor client activity across your portfolio and flag accounts that need attention
- Assign a team member to each client cohort so responsibility is clear and workload is balanced
- Schedule quarterly check-ins with clients to confirm their records are up to date before you begin the review
Practice management tools like Xero Practice Manager can help you track task progress and time spent per client. Tracking this data from the start gives you a baseline for pricing MTD as a service.
Records must be retained for at least five years, so build digital storage into your standard process. Cloud-based record keeping reduces the risk of lost paperwork and makes it simpler to respond to HMRC enquiries.
How do you avoid penalties and errors?
HMRC's penalty system for MTD for Income Tax is points-based. Each late quarterly submission adds one penalty point. Once you hit the four-point threshold, every subsequent late submission triggers a £200 fine.
Penalty points can be reset to zero, but your client must meet two conditions: submit all quarterly updates and tax returns on time for 12 months, and clear any outstanding submissions from the previous 24 months. Getting into a reliable rhythm early makes meeting these conditions far more achievable.
For the 2026–27 tax year, there are no penalties for missing a quarterly update deadline. This gives practices and clients time to adjust to the new reporting cadence. However, this grace period does not cover late Final Declarations or late tax payments. Communicate this distinction clearly to your clients so they don't assume blanket leniency.
Common errors to watch for include:
- Miscategorised income or expenses that distort the quarterly figures
- Duplicate transactions from manual entries alongside automated bank feeds
- Missing property income where a client has multiple rental sources
- Late bank feed connections that create a backlog of unreconciled transactions
Building a pre-submission review checklist into your workflow catches these issues before they reach HMRC. A five-minute check per client each quarter is far less costly than correcting errors after submission.
Simplify MTD for Income Tax with Xero
Preparing your practice for MTD for Income Tax doesn't need to be a last-minute effort. With the right tools and a phased plan, you can turn compliance into a service that strengthens client relationships and creates recurring revenue.
Xero's cloud accounting platform connects bank feeds, automates transaction categorisation, and supports quarterly submissions directly to HMRC. Combined with Xero HQ for portfolio oversight and Xero Practice Manager for workflow tracking, you have a single platform that covers both the compliance task and the practice management around it.
Join the partner programme to access partner-only tools, a free Xero subscription for your practice, and dedicated support as you prepare for MTD for Income Tax.
FAQs on MTD for Income Tax
Below are frequently asked questions about MTD for Income Tax and how it affects your practice and clients.
What counts as qualifying income for MTD for Income Tax?
Qualifying income is the combined gross income from self-employment and UK property before any allowable deductions. If a client earns from both sources, you add them together to determine whether they exceed the threshold. Employment income, dividends, and savings interest don't count towards the qualifying figure.
Can clients sign up for MTD for Income Tax voluntarily?
Yes. Clients whose qualifying income falls below the current threshold can sign up voluntarily through HMRC. Voluntary sign-up lets them test quarterly reporting before it becomes compulsory, which can make the transition smoother when the threshold eventually catches up to their income level.
What happens if a quarterly update is submitted late?
Each late quarterly submission adds one penalty point. Once the total reaches four points, every further late submission incurs a £200 penalty. Points reset to zero once the client submits on time for 12 months and clears any outstanding submissions from the prior 24 months. You can find the full details in HMRC's penalty guidance.
Are there penalties for late quarterly updates in the first year?
No. For the 2026–27 tax year, HMRC won't issue penalties for missed quarterly update deadlines, giving practices and clients time to adjust. Late Final Declarations and late tax payments are not covered by this grace period, so those deadlines must be met from the outset.
How long must records be kept under MTD for Income Tax?
Digital records must be retained for at least five years from the 31 January submission deadline of the relevant tax year. Cloud-based storage makes this straightforward and reduces the risk of lost or damaged records compared to paper filing.
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