HMRC Deadlines You Can’t Afford to Miss in 2025

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HMRC Deadlines You Can’t Afford to Miss in 2025

Updated 17/07/2025

Missing an HMRC deadline can lead to penalties, interest charges, or unnecessary stress for individuals and businesses alike. Whether you’re self-employed, operating a limited company, or running a charity, it’s crucial to keep on top of your tax obligations. Below, we’ve outlined the most important HMRC deadlines for 2025 and who they apply to.

Key 2025 HMRC Deadlines

31 January 2025 – Self Assessment Tax Return Due

Applies to: Self-employed individuals, landlords, company directors, and others required to complete a Self Assessment.

  • Online tax return for 2023/24 must be submitted

  • Any outstanding tax from 2023/24 must be paid

  • First payment on account for 2024/25 also due (if applicable)

Late filing results in an automatic £100 fine, even if no tax is owed.

5 April 2025 – End of the 2024/25 Tax Year

Applies to: Everyone

  • Last day to use your annual tax allowances (ISA, pension, capital gains)

  • Final opportunity for tax planning in the current tax year

6 April 2025 – Start of the 2025/26 Tax Year

Applies to: Everyone

  • Reset of annual allowances (Personal Allowance, ISAs, etc.)

  • New tax bands and thresholds may take effect

19 April 2025 – PAYE Month 12 Deadline

Applies to: Employers

  • Final submission of 2024/25 payroll to HMRC under Real Time Information (RTI)

  • Final payment of PAYE and National Insurance due for the tax year

31 May 2025 – P60 Distribution Deadline

Applies to: Employers

  • Provide P60 forms to all employees employed as of 5 April 2025

6 July 2025 – P11D and Benefits Reporting Deadline

Applies to: Employers who provide benefits in kind (e.g. company cars, health insurance)

  • Submit P11D forms to HMRC

  • Provide copies to employees

  • Submit P11D(b) and pay Class 1A NIC

31 July 2025 – Second Payment on Account Due

Applies to: Self-employed and those making payments on account

  • Second instalment for 2024/25 tax due

5 October 2025 – Register for Self Assessment

Applies to: New self-employed individuals or those with untaxed income

  • Must register with HMRC if you earned untaxed income in 2024/25 and haven’t already registered

31 October 2025 – Paper Tax Return Deadline

Applies to: Those choosing to file by paper

  • Submit paper Self Assessment tax return for 2024/25

  • Online filing deadline remains 31 January 2026

Tips for Staying on Top of Deadlines

  • Use a calendar: Sync HMRC dates with your digital calendar.

  • Work with an accountant: Let professionals handle compliance.

  • Set reminders: Set early reminders 2–3 weeks before each deadline.

  • Go digital: Use HMRC's online accounts and accounting software.

Need Help Meeting Deadlines?

At Clear Blue Sky Accountancy, we specialise in helping businesses and individuals stay on top of HMRC obligations. From Self Assessment to payroll and P11Ds, we ensure everything is submitted on time and correctly.

Avoid penalties and stay compliant in 2025 — Contact us today.

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