As a business owner, staying on top of your accounting and tax obligations is crucial to avoiding penalties and keeping your operations running smoothly. Here is a comprehensive guide to the key accounting and tax dates you need to know for 2025.
31 January 2025 Deadline for Self-Assessment Tax Returns (2023/24) If you are self-employed, a sole trader, or run a business that requires filing a Self-Assessment, this is your deadline for submitting your tax return online and paying any tax owed.
31 March 2025 End of Corporation Tax Financial Year If your business’s Corporation Tax aligns with the standard financial year, ensure your accounts are prepared for submission.
6 April 2025 Start of the 2025/26 Tax Year This marks the beginning of a new financial year for personal and business taxes. Ensure you have organised your records for the new year.
19 April 2025 Deadline for PAYE and NIC Payments (Quarter Ending 5 April) If you’re an employer, you must pay any PAYE (Pay As You Earn) and National Insurance Contributions by this date if you’re paying electronically. For cheque payments, the deadline is earlier (22 April).
06 May April 2025 Filing Deadline for VAT Returns (Quarter Ending 31 March) If your business is VAT-registered and your VAT quarter ends on 31 March, ensure your VAT return is filed and payment made by this date.
6 July 2025 Deadline for Filing P11D and P11D(b) Forms These forms report expenses and benefits provided to employees. Also, ensure Class 1A National Insurance is paid by 22 July if paying electronically.
31 July 2025 Second Payment on Account for Self-Assessment (2024/25) If you make advance payments towards your tax bill, this is the deadline for your second instalment.
1 October 2025 National Minimum Wage (NMW) and National Living Wage (NLW) Adjustments New rates for NMW and NLW may come into effect. Review employee wages to ensure compliance.
5 October 2025 Deadline to Register for Self-Assessment (2024/25) If you started a business or became self-employed in the 2024/25 tax year, register with HMRC by this date.
31 October 2025 Deadline for Paper Self-Assessment Returns (2024/25) If you prefer submitting a paper tax return, ensure it reaches HMRC by this date.
30 December 2025 Deadline for Online Self-Assessment (2024/25) If you want HMRC to collect tax through your PAYE code, file your online tax return by this date.
By marking these dates and adopting proactive financial practices, you can stay ahead and focus on growing your business without unnecessary stress.
If you need any help with your accounts or advice on tax, contact us by calling 01623 490 120 or by emailing This email address is being protected from spambots. You need JavaScript enabled to view it.
Haidee is our Personal Tax Director and is a fully qualified tax adviser, having achieved the ATT qualification in 2006. Tax efficiency being her main concern. Specialising in taxation, Haidee provides clients with advice on personal tax, PAYE services, VAT and social security. She also provides guidance to new start-up businesses.
Call us today on01623 490120
or email info@watsonk.co.uk
When you first start a business, your focus is usually on attracting customers, generating sales and building a successful company. Few business owners spend much time thinking about how or when they will eventually leave the business.
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