Staying on top of tax deadlines is essential for individuals, sole traders, and businesses across the UK. Missing key dates set by HM Revenue and Customs can result in penalties, interest charges, and unnecessary financial stress.
With ongoing changes such as the phased rollout of Making Tax Digital (MTD), maintaining awareness of deadlines is more important than ever. This guide outlines the key UK tax dates in 2026 and what they mean for you.
Overview of the UK Tax Year
In the UK, the tax year starts on 6 April and concludes on 5 April of the following year. Most deadlines in 2026 relate to the 2025/26 tax year, which ends on 5 April 2026.
Understanding this timeline is crucial, as filing obligations and tax payments are structured around it.
Key Tax Deadlines in 2026
31 January 2026 – Self Assessment Filing and Payment Deadline
This is the most important date in the tax calendar for individuals.
By this deadline, you must:
- Submit your online Self Assessment tax return for the 2024/25 tax year
- Pay any outstanding tax liability
- Make your first payment on account for the 2025/26 tax year (if applicable)
Late submission triggers an automatic £100 penalty, even if no tax is due, with further penalties and interest applied over time.
6 April 2026 – Marks the start of the new UK tax year
This marks the beginning of the 2026/27 tax year.
From this date:
- New tax rules, thresholds, and allowances may come into effect
- Businesses and individuals should begin maintaining records for the new tax period
- The next phase of Making Tax Digital begins to apply to eligible taxpayers
From April 2026, MTD for Income Tax will apply to self-employed individuals and landlords with annual business or property income exceeding £50,000. A lower threshold of £30,000 is expected to apply from April 2027.
31 May 2026 – P60 Deadline
Employers must provide P60 forms to employees who were on payroll at the end of the tax year (5 April 2026).
The P60 summarises:
- Total earnings
- Income tax deducted
- National Insurance contributions
Failure to comply may lead to issues with HM Revenue and Customs.
6 July 2026 – P11D Submission Deadline
Employers must submit P11D forms reporting employee benefits and expenses for the 2025/26 tax year.
These may include:
- Company cars
- Private medical insurance
- Interest-free or low-interest loans
Accurate reporting is essential to ensure correct tax and National Insurance treatment.
22 July 2026 – Class 1A National Insurance Payment
This is the deadline to pay Class 1A National Insurance contributions on benefits reported via P11D (if paying electronically, which most businesses do).
Missing this deadline may result in interest and penalties from HM Revenue and Customs.
31 July 2026 – Second Payment on Account
If you are required to make payments on account, this is the deadline for your second instalment towards your 2025/26 tax bill.
Payments on account apply if your previous tax bill exceeded £1,000 and help spread the cost of your tax liability.
Late payment will result in interest charges.
5 October 2026 – Self Assessment Registration Deadline
If you are newly self-employed or have untaxed income, you must register for Self Assessment by this date.
This includes:
- Freelancers and sole traders
- Landlords
- Individuals with additional income streams
Registering late may delay your ability to file and could result in penalties.
31 October 2026 – Paper Tax Return Deadline
This is the deadline for submitting paper Self Assessment tax returns.
Most taxpayers now file online, which extends the deadline to 31 January 2027 and provides a more efficient and secure process.
Making Tax Digital (MTD) – What to Expect in 2026
Making Tax Digital continues to transform how taxpayers report income.
From April 2026:
- It applies to self-employed individuals and landlords with income over £50,000
- Digital record-keeping becomes mandatory
- Quarterly updates must be submitted using compatible software
It is important to note that:
- Quarterly submission deadlines vary depending on your accounting period
- They are not fixed universal dates like traditional tax deadlines
Preparing early for MTD will help ensure smooth compliance and reduce administrative burden.
Other Ongoing Tax Obligations
In addition to the key annual deadlines, taxpayers must manage regular obligations:
VAT Returns
- Usually filed quarterly
- Payment is typically due one month and 7 days after the end of the VAT period
PAYE and National Insurance
- Monthly payments are due by the 22nd (if paying electronically)
Corporation Tax
- Payment deadline: 9 months and 1 day after the end of the accounting period
- Filing deadline: 12 months after the end of the accounting period
Consequences of Missing Deadlines
Failing to meet deadlines set by HM Revenue and Customs can result in:
- Fixed and escalating penalties
- Interest on unpaid tax
- Compliance investigations
- Increased administrative burden
Consistent non-compliance may lead to more serious enforcement actions.
Practical Steps to Stay Compliant
To effectively manage your tax obligations:
- Keep accurate and up-to-date financial records
- Use software compatible with Making Tax Digital
- Set reminders for key deadlines
- Review your tax position regularly
- Seek professional advice when necessary
A proactive approach reduces risk and improves financial control.
Conclusion
The UK tax dates for 2026 includes several critical deadlines that individuals and businesses must not overlook. With the continued rollout of digital reporting under Making Tax Digital, compliance is becoming more structured and time-sensitive.
Staying organised and informed will help you avoid penalties, maintain compliance, and focus on growing your business with confidence. If you need assistance managing your 2026 tax deadlines, professional guidance can ensure accuracy, efficiency, and peace of mind.