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MTD ITSA Quarterly Forecaster (2026/27)

Enter your profit so far this tax year — by quarter if you have it, or as one annual estimate. We'll project your year-end Income Tax + Class 4 NIC liability and lay out every MTD ITSA submission deadline plus the Self Assessment payments on account schedule.

Who has to use MTD ITSA in 2026/27? Sole traders & landlords whose qualifying income exceeded £50,000 in 2024/25. From April 2027, the threshold drops to £30,000. Below £50,000, the calculator still works but you stay on annual Self Assessment without quarterly submissions.

Your profit by quarter

Leave future quarters blank — we'll project them based on quarters you've completed.

Profit reported so far
Projected full-year profit
Estimated Income Tax
Estimated Class 4 NIC
Estimated total tax bill
First payment on account (31 Jan 2028)
Second payment on account (31 Jul 2028)

Your 2026/27 deadline calendar

5 Aug 2026Q1 quarterly update (period 6 Apr – 5 Jul)
5 Nov 2026Q2 quarterly update (period 6 Jul – 5 Oct)
5 Feb 2027Q3 quarterly update (period 6 Oct – 5 Jan)
5 May 2027Q4 quarterly update (period 6 Jan – 5 Apr)
31 Jul 2027Second payment on account for 2025/26
31 Jan 2028Final declaration for 2026/27 + balancing payment + first payment on account for 2027/28

Quarterly deadlines from gov.uk/government/collections/making-tax-digital-for-income-tax. Tax bands and NIC rates 2026/27. Personal Allowance assumed unused. Excludes student loans, dividends, savings interest, payment-on-account thresholds (under £1,000 = no POA).

Receipts feed your quarterly summary — make sure they're captured

Each MTD ITSA quarterly submission asks for income and categorised expenses. Miss a receipt, lose the deduction. PocketReceipt scans, categorises, and exports HMRC-aligned summaries by tax year quarter.

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How the forecaster works

Enter your profit for any completed quarters of the 2026/27 tax year. The calculator extrapolates: if you've completed N quarters with total profit P, projected full-year profit = P × (4/N). Then it applies 2026/27 Income Tax bands (20% / 40% / 45% above £12,570 PA) and Class 4 NIC (6% £12,570–£50,270, then 2%).

What MTD ITSA actually changes

MTD ITSA does NOT change WHEN you pay tax — payments still happen via Self Assessment timeline (31 Jan balancing + 31 Jul second payment on account). It changes WHEN you submit information: from one annual return to four quarterly summaries plus a final declaration.

Each quarterly update is a summary of income and categorised expenses for the period — not a tax calculation, just numbers. HMRC tells you the running estimate of your tax based on what you've submitted, but no tax is actually due until 31 January after the tax year ends.

The 2026/27 calendar in plain English

  • 5 Aug 2026 — Q1 update due (covering 6 Apr to 5 Jul)
  • 5 Nov 2026 — Q2 update (covering 6 Jul to 5 Oct)
  • 5 Feb 2027 — Q3 update (covering 6 Oct to 5 Jan)
  • 5 May 2027 — Q4 update (covering 6 Jan to 5 Apr)
  • 31 Jul 2027 — Second payment on account for 2025/26 (the previous tax year)
  • 31 Jan 2028 — Final declaration for 2026/27, balancing payment, and first payment on account for 2027/28

Payments on account explained

If your tax bill is over £1,000 and less than 80% was collected at source, HMRC requires advance payments. Each payment is 50% of your previous year's tax bill. Two dates: 31 January and 31 July. The forecaster shows both based on its projected liability.