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    5. December Key Dates

    January Key Dates

    Newsletter issue – January 2026

    1st

  1. Corporation Tax payments are due for companies with a year-end of 31st March

    2. 19th

  2. For employers operating PAYE, this is the deadline to send an Employer Payment Summary (EPS) to claim any reduction on what you'll owe HMRC.

  3. It is also the deadline for employers operating PAYE to pay HMRC by post, for December.

    4. 22nd

  4. Deadline for employers operating PAYE to pay HMRC electronically, for December.

    5. 31st

  5. Corporation Tax Returns (CT600 form) are due for companies with a year-end of 31st January.

  6. It is also the deadline to submit your online self-assessment tax return (if you are required to do one) for the tax year ended 5th April 2025, and to pay HMRC any tax owed.

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