Compliance
Making Tax Digital for Income Tax Starts in April 2026 — Is Your Firm's Client Workflow Ready?
Evoke LedgerBridge Editorial | 4/9/2026 | 7 min read
From 6 April 2026, Making Tax Digital for Income Tax Self Assessment (MTD ITSA) is mandatory for sole traders and landlords with qualifying gross income above £50,000. The threshold drops to £30,000 from April 2027 and to £20,000 from April 2028. If you serve self-employed clients, landlords, or those with combined qualifying income above these thresholds, the annual Self Assessment model you have been working with for years is being replaced with a quarterly reporting cycle that demands a fundamentally different workflow relationship between your firm and your clients. Most UK accounting practices have purchased MTD-compatible software. Fewer have redesigned the client communication and document collection processes that determine whether that software gets the data it needs to do anything useful.
What MTD ITSA Actually Requires from Your Firm's Workflow
MTD for Income Tax is not simply a software upgrade. It is a reporting cadence change. Instead of one Self Assessment return per year, affected clients must submit quarterly updates to HMRC — summaries of income and expenses for each quarter — plus a final year-end declaration. For accounting firms, this means four client touchpoints per year where previously there was effectively one. Each quarterly submission requires your client to have maintained digital records throughout the quarter, and to make those records available to your team in time for review and submission.
The mechanics of what HMRC requires are clear: digital records of all income and expenses maintained in MTD-compatible software, submitted via API. What HMRC does not specify — but what your firm must design — is how the information flows from your clients to your team, through your review process, and into the submission workflow, four times per year, for every affected client, without your firm's administrative overhead quadrupling.
The firms that will manage this transition well are the ones that have already built a structured, repeatable client communication process for recurring work. The firms that manage it badly are the ones whose current workflow depends on clients remembering to do things, on email chains to collect information, and on individual staff members maintaining the client relationship through memory and ad-hoc follow-up.
What the Quarterly Workflow Needs to Look Like
A functional MTD ITSA quarterly workflow has four components that your current annual self-assessment process almost certainly handles poorly or not at all.
Quarterly document collection with defined close dates. Each quarter has a natural close date — March 31, June 30, September 30, December 31 for calendar-aligned businesses. Your firm should issue a document collection request to each affected client within one week of the quarter close, specifying exactly what is needed: bank statements for the period, expense receipts, rental income confirmation, or whatever is relevant to that client's income sources. This should be a structured, tracked request through a single channel — not an email.
Client bookkeeping status monitoring. Many self-employed clients do not maintain real-time digital records. Under MTD ITSA, they are required to. Part of your firm's quarterly touchpoint should be a check on whether the client's records are current and in the correct format. Clients who have been filing annual self-assessment returns from a shoebox of receipts need active support to transition to digital record-keeping — and that support needs to happen before the submission window, not during it.
Quarterly review and submission workflow. The quarterly update itself, once records are received, needs a standardised review process. This is less intensive than a full self-assessment return, but it still requires checking income and expense categorisation, identifying anomalies, and submitting through MTD-compatible software. Build this as a repeatable process that any trained staff member can execute consistently, not a bespoke process that depends on the partner who knows the client.
Year-end declaration workflow. The year-end declaration, which reconciles the four quarterly updates and accounts for any adjustments, is the MTD ITSA equivalent of the annual tax return. This is the most complex submission in the cycle and the one that requires the highest-quality records from the preceding quarters. Firms whose quarterly process is clean will find the year-end declaration straightforward. Firms whose quarterly process is ad-hoc will find that the year-end declaration exposes every gap.
A Framework for Getting Your Client Base Ready
Segment your clients by threshold and income type. Clients above £50,000 qualifying income need to be MTD-compliant from April 2026. Clients between £30,000 and £50,000 have until April 2027. Clients between £20,000 and £30,000 have until April 2028. Understand your client base's composition before you design your outreach.
Issue a client readiness letter in the first quarter of 2026 to affected clients. This letter should explain: what MTD ITSA requires of them, what your firm will do differently as a result, what they need to change about their record-keeping, and what the timeline is. Clients who receive this communication from their accountant — rather than discovering it themselves — are far more likely to engage productively.
Assess each affected client's current record-keeping. Some clients are already using cloud accounting software and maintaining current records. Others are using spreadsheets, paper, or nothing. The clients in the latter category need active intervention, and they need it now. Identify them, prioritise them, and build a transition plan before April.
Design your quarterly workflow before April. Issue the first quarterly request under the new process in late April 2026, covering the quarter ending March 31. Use that first quarter to test your process, identify what is working and what is not, and refine before Q2.
What This Looks Like Inside a Purpose-Built Platform
Evoke LedgerBridge handles the quarterly touchpoint cycle as a structured, repeatable batch workflow. Quarterly document requests go out simultaneously to all MTD-affected clients, with specific items, due dates, and automated reminders. Clients submit through the portal. Your team works a review queue. The communication trail — every request, every submission, every review action — is captured automatically in the engagement record.
The platform also handles the GDPR dimension of MTD. UK accounting firms processing client financial data are data controllers under GDPR, and the quarterly nature of MTD ITSA means that data is flowing between firm and client four times per year rather than once. Every data exchange should happen through a controlled channel with defined access and a retention policy — not through email that may be forwarded, lost, or accessed by unintended recipients.
The article on audit-ready client communication logs is directly relevant here. An MTD ITSA engagement record that demonstrates, for each quarterly period, exactly what was requested, what was received, what was reviewed, and what was submitted is both a professional standards requirement and a client dispute protection mechanism.
Common Mistakes Firms Are Making Right Now
The most common mistake is treating MTD ITSA as a software problem rather than a workflow problem. Purchasing MTD-compatible software is necessary but not sufficient. The software needs clean, complete data from clients on a quarterly basis. Getting that data requires a workflow redesign, not just a new software subscription.
The second mistake is delaying client communication. Every week that passes without an affected client receiving communication from their accounting firm about what MTD ITSA means for them is a week of preparation time lost. Clients who have not yet been told what is changing will make poor choices — or no choices — in the absence of guidance.
The third mistake is not pricing the additional work correctly. Four touchpoints per year instead of one is materially more work. If your firm is managing MTD ITSA compliance for affected clients on an annual fee that was designed for an annual workflow, you are underpricing the engagement. The transition to MTD ITSA is the right moment to review engagement letters, scope, and pricing for every affected client.
The risk of staying with your current workflow past April 2026 is not hypothetical. It is quarterly. Every quarter that your firm manages MTD ITSA submissions through an ad-hoc, email-based process is a quarter where your staff works harder than they should, your records are weaker than they need to be, and your clients' confidence in the process is lower than it could be.
If your firm is ready to build the client workflow infrastructure that makes MTD ITSA manageable at scale, Evoke LedgerBridge was built for exactly this.
Book a demo or chat on WhatsApp to see how it fits your delivery model.