What Changes on 6 April 2026
From 6 April 2026, sole traders and landlords with qualifying income over £50,000 must keep digital records and submit quarterly updates through compatible software under MTD for Income Tax.
The first phase is operational, not just technical. For firms, the real change is workflow cadence: client data collection, categorisation, review, and submission now happen in-year, not as a single year-end scramble.
HMRC has also confirmed a year-one easement for quarterly update penalties for those mandated from April 2026, but firms should treat that as onboarding runway, not as a reason to delay operating discipline.
Who Is In Scope
MTD for Income Tax is phased. Use this timeline to plan capacity, software rollout, and client segmentation.
Phase 1 · 6 April 2026
Sole traders and landlords with qualifying income over £50,000.
Phase 2 · 6 April 2027
Threshold expands to qualifying income over £30,000.
Phase 3 · 6 April 2028 (planned)
Government has set out plans to lower the threshold to £20,000.
Operating Model for Accounting Firms
The winning pattern is supervised autonomy: let the agent handle repetitive preparation work, then hold approval gates where professional judgement is required.
Agent Handles
- Client document chasing and reminders
- Initial data extraction and categorisation prep
- Quarterly draft pack assembly by client
- Exception tagging and missing-data flags
- Status updates and internal handoff tracking
Accountant Approves
- Final treatment of exceptions and judgement calls
- Client-sensitive or regulatory-risk decisions
- Quarterly submission readiness sign-off
- Year-end declaration quality and completeness
- Escalations and complex advisory interventions
"Your accountants do the accounting. The agent does the chasing."
90-Day Plan Before Mandation
Treat preparation as an operating rollout, not a software install.
Phase 1 (Days 1-30): Segment and Baseline
Segment clients by MTD phase, map current data quality and handoff points, and baseline effort per client for quarterly prep.
Phase 2 (Days 31-60): Install Workflow
Define monthly document cadence, build exception queues, and deploy approval-based drafting workflows for the highest-volume client set first.
Phase 3 (Days 61-90): Run Dry Quarters
Execute rehearsal cycles end-to-end: reminder triggers, draft preparation, approval gates, and submission readiness checks. Measure cycle time and error leakage.
Frequently Asked Questions
What is the first MTD Income Tax start date?
The first mandated phase starts on 6 April 2026 for sole traders and landlords with qualifying income over £50,000.
What are the next threshold phases after 2026?
The next phase is 6 April 2027 for qualifying income over £30,000. The government has also set out plans to lower the threshold to £20,000 from 6 April 2028.
Are there penalties for late quarterly updates in year one?
For taxpayers mandated from 6 April 2026, HMRC says it will not apply penalty points for late quarterly updates during the first 12 months. Penalty points can still apply to late annual end-of-year submissions.
Can firms still wait until year-end to organise records?
That approach is high risk under quarterly reporting. Firms should move to a monthly operating cadence for data capture, exception review, and client follow-up so quarter-end submission is a routine close, not a rescue task.
Where does supervised autonomy fit in?
It fits the operational middle ground: the agent executes repetitive preparation work, then pauses at approval gates for accountant judgement. This increases throughput while preserving compliance control.
Sources
Need an MTD operating plan, not another checklist?
We diagnose your current workflow, install supervised agent operations, and run the cadence with your team so quarter-end becomes controlled and repeatable.
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