Tax Diary: January to February 2025 Deadlines That May Still Matter

This tax diary highlights key tax deadlines that fall between January and February 2025. It is relevant for taxpayers reviewing whether all obligations from the start of the year have been dealt with correctly.

Although these deadlines are upcoming or past, unresolved issues can still result in penalties, interest, or HMRC follow-up action.

Key Tax and Payroll Deadlines for January and February 2025

• 1 January 2025 – Due date for Corporation Tax due for the year ended 31 March 2024
• 19 January 2025 – PAYE and NIC deductions due for month ended 5 January 2025. (If you pay your tax electronically the due date is 22 January 2025).
• 19 January 2025 – Filing deadline for the CIS300 monthly return for the month ended 5 January 2025.
• 19 January 2025 – CIS tax deducted for the month ended 5 January 2025 is payable by today.
• 31 January 2025 – Last day to file 2023-24 self-assessment tax returns online.
• 31 January 2025 – Balance of self-assessment tax owing for 2023-24 due to be settled on or before today unless you have elected to extend this deadline by formal agreement with HMRC. Also due is any first payment on account for 2024-25.
• 1 February 2025 – Due date for Corporation Tax payable for the year ended 30 April 2024.
• 19 February 2025 – PAYE and NIC deductions due for month ended 5 February 2025. (If you pay your tax electronically the due date is 22 February 2025)
• 19 February 2025 – Filing deadline for the CIS300 monthly return for the month ended 5 February 2025.
• 19 February 2025 – CIS tax deducted for the month ended 5 February 2025 is payable by today.

Why January and February Deadlines Still Matter

Tax deadlines do not disappear once the date has passed. Where a return was not filed or a payment was not made on time, the obligation remains until it is resolved.

For many taxpayers, January marks the final Self Assessment filing deadline, making it particularly important to ensure that everything is filed and paid on time, an area where errors are often identified later by a tax specialist in London during a compliance review.

Common Obligations in January and February

Deadlines during this period often relate to:

• Self Assessment filing for the previous tax year (due by 31 January)
• Payments for Self Assessment due by 31 January
• Payments on account for the upcoming tax year, where applicable
• VAT return submissions and payments
• PAYE and National Insurance reporting and payments

Which obligations applied will depend on your circumstances, such as whether you were self-employed, a landlord, or otherwise required to file a Self Assessment return.

What Happens If a Deadline Was Missed?

Missing a January deadline usually results in an automatic late filing penalty. Interest is also charged on any unpaid tax from the original due date.

Further penalties can apply if delays continue. Even where no immediate action was taken by HMRC, outstanding issues may still be pursued later, often after matters have been reviewed with a tax advisor in London or raised through HMRC correspondence.

Why It Is Worth Reviewing Now

Some taxpayers assume that once the January deadline has passed, there is nothing more to do. In practice, addressing missed obligations sooner can help limit further charges and reduce the risk of compliance action.

Reviewing whether all January–February 2025 obligations were met can help avoid unexpected demands or enforcement action later in the tax year.

HMRC Guidance on Late Tax Deadlines

HMRC provides guidance on late filing, late payment, penalties, and interest on
GOV.UK.

Did You Miss Any January or February 2025 Deadlines?

Whether any action is required now will depend on which obligations applied to you at the time and whether they were dealt with correctly. For individuals and businesses in Kingston upon Thames and nearby areas such as Thames Ditton and Hinchley Wood, CIGMA Accounting can review your position and confirm whether anything remains outstanding or needs to be addressed.