Online SA return · balancing payment · 1st Payment on Account 2026/27
Employer / Payroll
19 Apr 2026
Agree PAYE Settlement Agreement for 2025/26
6 Jul 2026
P11D / P11D(b) submission for 2025/26
MTD for Income Tax
6 Apr 2026
⚡ Phase 1 live — £50k+ gross income must use MTD software
7 Aug 2026
First quarterly update due (Q1: Apr–Jun 2026)
6 Apr 2027
Phase 2 — threshold drops to £30,000
6 Apr 2028
Phase 3 — threshold drops to £20,000
Key reminders
📌Late SA filing: £100 immediately, rising after 3 and 6 months
📌Late payment interest: 7.25% p.a. on unpaid tax
📌Payments on Account apply if your prior year bill exceeded £1,000
📌MTD Phase 1: no penalty for late quarterly updates in 2026/27 only
📌Personal Allowance frozen at £12,570 until at least April 2031
📌Keep records for 5 years after the 31 January SA deadline
Need help with your bookkeeping or tax return? FinWise Tax offers affordable services for sole traders and small businesses. Message us on WhatsApp — we typically reply within a few hours.
⚠ These are estimates only — not tax advice. Results are based on standard 2026/27 HMRC rates and may not reflect your full circumstances. Always verify your obligations directly with HMRC at gov.uk/browse/tax. For personalised advice speak to a qualified accountant. FinWise Tax (Hayat Taym Ltd) accepts no liability for decisions based solely on these figures.
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