How MTD Changes Accountant-Client Relationships
Under MTD for Income Tax, clients must submit quarterly updates regardless of whether they use an accountant. This creates new advisory and administrative touchpoints throughout the year. Practices that help clients set up systems correctly from the start will reduce errors and client queries at year end.
Segmenting your client base by MTD wave
Rather than treating every affected client the same, most practices find it easier to group them by when they’re mandated and by how much hands-on help they’ll need:
- April 2026 wave (qualifying income over £50,000) — already in scope. If you haven’t already confirmed which clients cross this threshold on a gross basis (not profit), that review is overdue.
- April 2027 wave (£30,000+) — worth flagging to affected clients now so software and record-keeping habits are in place well before their start date, rather than in the weeks beforehand.
- Digitally confident clients who can manage their own quarterly submissions with light-touch oversight, versus clients who will need software chosen, set up and largely run for them.
That second split matters most for planning capacity — it’s usually a minority of clients (often lower-fee sole traders and landlords) who generate a disproportionate share of the hands-on quarterly workload.
Software and agent authorisation at practice level
Beyond choosing software for individual clients, practices need their own MTD-ready setup: an HMRC agent services account linked to existing agent authorisations, and a view across which clients are authorised on which software. Where a client already runs bookkeeping software with an MTD-compatible module, the practical work is usually authorising the agent connection and checking the digital-link chain is intact end to end — not re-platforming the client.
What Accountants Need to Know About MTD Deadlines
Clients in the first wave have been filing quarterly updates since 7 August 2026, with the same four dates repeating every tax year: 7 August, 7 November, 7 February and 7 May. Practices with a large number of sole trader and landlord clients should review their client base now for the April 2027 wave and prioritise onboarding well ahead of it, rather than facing a rush the way many did for the first wave.
If your practice needs extra capacity
Some practices handle the extra quarterly workload entirely in-house; others bring in support for the client segments that don’t justify standard billing rates for hands-on quarterly work. Digital Tax Service provides confidential white-label support for accountancy firms in that position — see how the service actually works, or the commercial terms, on the pages below.