Late submission of first time self accessement return

I arrived in the UK in May 2022. I worked a freelance job for a business in my home country in Sep, Oct, and Nov 2022. After that, I have been working in a business in the UK until now. I know I should submit my self-assessment tax return for the 3 months I worked as a freelance. But I missed the deadline of 5 Oct 2023. What should I do now? I just have a Government Gateway Number. Thanks.

Hi

If you have registered for self assessment, as self employed, you will have a 10 digit Unique Taxpayer Reference (UTR) number.  
If not, you can register as self employed at Check how to register for Self Assessment
using your Goverment gateway number and password.  
You can complete an online tax return at File your Self Assessment tax return online
Any online returns received after 31 Janaury 2024, may be subject to penalties and interest charges, which you can appeal at Disagree with a tax decision.

Thank you