I'm a full time PAYE employee on about £32k.
I've just started doing some self employed admin work for a small business run by a family member. I'm genuinely self employed - work when I want etc and it's all permitted by my main employer.
I'm doing between 30mins and 2hrs 5 days a week (evening work) for basic admin and customer service type tasks. We've agreed £9/hour which I'm happy with. It's probably going to average about £250 month for the time being.
I'm stumped though when it comes to sorting my tax for this as I've never done it and HMRC website is clear as mud.
I will need to fill out the SE form for 2021-2022? I'm invoicing him for my time, so can be accurate in my reporting.
Can anyone advise please? How much should I put away from each invoiced sum to account for a tax / NI bill?