Previous years Self employment tax

How do I go about providing my self employment income for year 23-24? I was working 2 hrs self employed each week alongside my 4 days employed position. I've declared the earnings for this year, but cannot see how I declare for the previous year? I was told i Had to declare it by October?? Many thanks for your help

Hi,
If your gross income was over £1000 from your self employment then you will need to register as self employed and declare the income on a Self Assessment tax return:
Set up as a sole trader: step by step
Thank you.