Which of your clients hit MTD for Income Tax, and when?
Paste your client book, get a phased plan in seconds. Nothing you paste is stored.
Any format. Names alone work; include self-employment and rental income figures for a full triage.
The aggregation trap
Qualifying income is a client's gross self-employment income plus their gross UK property income, combined, before any expenses are deducted. A client with £35,000 of self-employment income and £20,000 of rental income has £55,000 of qualifying income, and is mandated now, even though neither source alone crosses £50,000.
A client with both self-employment and property income also files a separate quarterly update per source. Two sources means eight quarterly updates a year, not four, one set for the trade and one for the property business.
MTD ITSA triage
Frequently asked
What counts as qualifying income for MTD ITSA?
Qualifying income is a client's gross self-employment income plus their gross UK property income, added together, before any expenses or allowances are deducted. This is the aggregation practices get wrong most often: two income sources that individually sit under a threshold can combine to push a client into an earlier mandate wave.
My client is under £20,000 — are they ever in scope?
Not yet. HMRC has confirmed thresholds down to income over £20,000 from April 2028, but hasn't announced a date for anyone below that. Keep an eye on future Budget announcements, and it's still worth moving them to digital record-keeping so a future mandate is a formality rather than a scramble.
Can AccountsOS file MTD ITSA quarterly updates today?
Not yet, and be wary of anyone who says otherwise: HMRC has paused ITSA production access for new software while it moves to a controlled-access model, with guidance expected by autumn 2026. AccountsOS gets your clients' records digital now, which is the part of the mandate you can act on today. Quarterly filing is on our roadmap for when HMRC reopens access.
What are the MTD ITSA quarterly deadlines?
MTD ITSA quarterly submission deadlines (standard quarter periods): Q1 (6 Apr to 5 Jul) due 7 Aug. Q2 (6 Jul to 5 Oct) due 7 Nov. Q3 (6 Oct to 5 Jan) due 7 Feb. Q4 (6 Jan to 5 Apr) due 7 May. Final Declaration due 31 January after the tax year end.
Do you store what I paste into this tool?
No. Nothing you paste is written to a database or kept in a log. The text is sent to the parser, triaged, and the result is returned to your browser — that's it.
Get the clients we flagged onto digital records now
AccountsOS keeps your clients' books digital and ready, so when HMRC opens quarterly MTD ITSA filing to new software, your book isn't starting from a standing start.