From 6 April 2026, Making Tax Digital for Income Tax (MTD ITSA) is live. Sole traders and landlords with gross income above £50,000 must now maintain digital records and file quarterly updates with HMRC every year. For individual business owners, that is a compliance adjustment. For accounting practices managing hundreds of in-scope clients, it is an operational transformation that most firms were not structured to absorb.
If your practice has 50 MTD clients, the workload is demanding but manageable. If you have 200, 300, or 500+, the quarterly submission cycle creates a volume problem that goodwill and overtime simply cannot solve. This article covers what practices with large client books are doing right now to stay ahead, without burning out their teams or compromising on quality.
The Scale Problem Practices Did Not Plan For
Most accounting firms spent 2025 focused on the compliance side of MTD ITSA, understanding the rules, selecting compatible software, and running client communications. That work was necessary. But it left a different question unanswered:
The question every practice owner is asking in April 2026
We know what MTD ITSA requires. We’ve told our clients what to do. But who in our team is actually going to prepare 400 quarterly updates before July?
Here is the arithmetic. A practice with 300 in-scope clients faces approximately 1,200 quarterly MTD submissions per year, in addition to the year-end finalisation process and existing compliance obligations. Even with efficient processes, this translates into hundreds of hours of preparation work every quarter before advisory work even begins.
For practices that have not restructured their delivery model, that workload lands on the same team already handling year-end accounts, VAT returns, and payroll. This is why outsourcing for accounting firms has accelerated rapidly in 2026 — practices need a structural solution, not just more hours in the day.
How Practices Are Actually Responding Right Now
1. Absorbing it internally, the short-term fix
The most common response is redistributing MTD preparation across the existing team: junior staff take on more data processing, seniors do more review, and everyone works harder during quarterly peaks. For smaller firms, this is manageable in the short term. For practices with large client books, it creates staff pressure, retention risk, and quality gaps that compound with every quarter.
2. Hiring dedicated compliance staff, expensive and slow
Hiring MTD compliance specialists solves the volume problem but creates others. The UK accounting sector faces a well-documented talent shortage, with recruitment timelines often extending for several months. In addition, hiring, onboarding, and training costs can be significant, while fixed headcount costs remain even if client volumes fluctuate.
3. Partnering with a specialist delivery team, the scalable model
A growing number of practices are separating preparation from review: partners and senior accountants retain client ownership and sign-off, while a specialist team handles quarterly record prep, transaction categorisation, and update drafting. This is the core model behind accounting outsourcing, the practice stays in control of the client relationship, while the bulk of the work is handled by a dedicated team working within its existing software environment.
A Scalable Delivery Model for MTD ITSA Compliance
This is what an effective delivery model looks like across a large MTD client base:
| Task | Typical time cost | Best handled by |
| Quarterly digital record prep | 3–6 hrs per client/qtr | Delivery team |
| Transaction categorisation | 1–3 hrs per client/qtr | Delivery team |
| Chasing missing client records | 1–2 hrs per client/qtr | Delivery team |
| Software troubleshooting | Variable — often urgent | Delivery team |
| Submission review & sign-off | 30–45 mins per client | Practice partner |
| Client advisory & tax planning | As needed | Practice partner |
| HMRC query management | As needed | Practice partner |
The leverage is significant. A partner who receives a fully prepared, flagged quarterly file can review and approve it in under 45 minutes. The same partner doing the preparation themselves might spend 3–4 hours on the same client. Multiply that across 300 clients and four quarters, and the capacity difference is the difference between a practice that grows through MTD and one that struggles under it.
The practices managing this most effectively have one thing in common: they treated Making Tax Digital as an operational design challenge from the start — not an additional workload to absorb — and built their delivery model before the first deadline, not in response to it.
How Befree Supports MTD Delivery at Scale
Befree works with UK accounting practices as a dedicated back-office delivery partner — handling digital record preparation, transaction categorisation, quarterly updates, and client data follow-ups within your existing systems.
Whether you use Xero, QuickBooks, FreeAgent, or Sage, your clients remain yours, your processes stay intact, and your team stays focused on higher-value work. We handle the volume behind the scenes.
Five Steps Practices Should Take Before July 2026
The first quarterly submission deadline for April 2026 clients falls on 7 August. Here is how to get ahead of it:
- Segment your client list by complexity now. Tier your in-scope clients by workload. Mixed-income landlords, multi-property portfolios, and clients still on spreadsheets are far more time-intensive than clean, software-connected sole traders. Plan your capacity around the high-complexity cohort first.
- Map your Q2 preparation hours before June. Work backwards from the July deadline. Calculate your team’s available preparation hours — factoring in annual leave and existing commitments. If the numbers do not add up, July is not the time to discover it.
- Get your clients’ digital records in order. MTD ITSA requires ongoing digital record-keeping throughout the year — not just at deadline week. Practices that also outsource bookkeeping for their clients have a significant advantage here: records are maintained monthly, categorised correctly, and ready for quarterly submission without a last-minute scramble.
- Standardise your quarterly client intake checklist. A standard checklist — specifying exactly what digital records you need from each client, in what format, by what date — dramatically reduces back-and-forth. Set it up once, and it runs every quarter with minimal management.
- Define your delivery model before Q2 begins. Whether you are handling MTD preparation internally, redistributing across your team, or working with an external delivery partner, your model needs to be operational before the first deadline — not improvised in response to it.
Compliance Is Straightforward. Delivery at Scale Is the Hard Part
Most practices understand MTD ITSA well enough by now. The rules are clear, the software is available, and the client communications have been sent. What is harder — and what will separate firms that grow through this period from those that grind through it — is building a delivery model that handles 400 quarterly submissions per year without breaking the team.
Practices that treat MTD as an operational design problem — and solve it with a structured delivery model before the first deadline — will find that the quarterly cycle becomes a competitive advantage. Clients whose accountants manage MTD reliably and efficiently do not leave. Clients whose practices are perpetually scrambling do.
At Befree, we work alongside UK accounting practices to provide exactly that kind of delivery capacity — so your team stays focused on the client relationships and advisory work that define the real value of your firm.
Frequently Asked Questions
Which clients are in scope for the April 2026 MTD ITSA mandate?
The first wave applies to self-employed sole traders and landlords, or those with a combination of both — whose total qualifying gross income exceeded £50,000 in the 2024/25 tax year. Income is measured before expenses and capital allowances. In-scope status for April 2026 is determined by 2024/25 income — the tax year prior to the mandate date. For the April 2027 wave, HMRC will use 2025/26 income. Practices should identify their 2027 cohort using 2025/26 Self Assessment data as it becomes available. The threshold drops to £30,000 from April 2027. General partnerships are not included in the current mandate.
What does a quarterly MTD ITSA update require from a practice?
Each quarterly update requires a summary of the client’s business income and expenses for that three-month period, submitted to HMRC via compatible software within one month of the quarter end. At year-end, an End-of-Period Statement and Final Declaration are also required, replacing the traditional Self Assessment return. For practices managing large client volumes, the preparation and reconciliation work before submission consumes most of the time.
What are the HMRC penalties for missing MTD ITSA quarterly deadlines?
How can practices handle MTD preparation at scale without increasing headcount?
The most effective approach is separating preparation from review. A back-office delivery team specialises in digital record preparation, transaction classification, and quarterly update drafting, while practice partners and senior accountants retain client ownership, review, and approval. This model scales as the client base grows without requiring proportional increases in headcount and maintains quality through a structured review process.
What MTD-compatible software should accounting firms be using?
HMRC maintains an updated list of recognised MTD-compatible software on GOV.UK. The most widely used platforms among UK accounting practices include Xero, QuickBooks Online, FreeAgent, Sage, and TaxCalc. Note that MTD for Income Tax uses different technical standards from MTD for VAT — practices should confirm their chosen software is specifically approved for MTD ITSA submissions, not just MTD for VAT. Clients still on spreadsheets need to be migrated to compatible software before their first quarterly deadline.
When does the second MTD ITSA wave take effect?
The second wave applies to sole traders and landlords with a qualifying gross income between £30,000 and £50,000, scheduled from 6 April 2027. A further phase for those above £20,000 is planned for April 2028, subject to HMRC confirmation. Practices should begin identifying their 2027 cohort now — using 2025/26 income data, to allow at least six months to prepare clients for digital record-keeping before the mandate applies.