If you have not yet had your self-assessment tax return submitted to HMRC, there’s not much time left. All self-assessment returns are due to be submitted to HMRC by 31st January 2026 at the latest. If the return is late then it can lead to an immediate £100 fine, so it’s best to avoid this altogether and make sure your returns are completed and submitted as soon as possible. Interest will also start to build up if any tax due is paid late. 

Don’t leave it too late!