Sole Trader Tax Deadlines 2026/27: Complete Calendar
Missing HMRC tax deadlines can result in automatic penalties and interest. Here is your essential calendar for the 2026/27 tax year so you can stay fully organized.
Key Dates Checklist
Deadline
What is due
Applies to
31 July 2026
2nd Payment on Account for 2025/26
Tax bills over £1,000
5 October 2027
Register for Self Assessment
New sole traders
31 October 2027
Paper tax return deadline
Paper filers only
31 January 2028
Online return and balancing payment
All online filers
31 January 2028
1st Payment on Account for 2027/28
Tax bills over £1,000
Late filing penalties
Filing your return even one day late triggers an automatic £100 penalty from HMRC. If you delay filing by 3 months, daily penalties of £10 per day start to apply, capped up to £900. After 6 months, an additional charge of £300 or 5% of the tax due is added.
Avoid last-minute surprises by calculating your tax liabilities early using our Sole Trader Tax Calculator.