Have a penalty charge from hmrc for not filing tax return. Used to be self employed a year and a half ago and been on maternity allowance and some uc for nearly a year. I have bad PND and I didn’t realise I had to do tax return as I assumed they would know I was on matt allowance and not working as it’s through hmrc. Is there any way of getting out of the fine ? I know £100 isn’t a lot to some people but it is to me , il struggle to afford it.