Tax return - adding previous years expences

Letdown69

Hi All,
As per the title, on my tax return how do I add previous years expenses that i missed off the previous tax returns. Is there a specific section for previous years or does this need to be added when setting up the form initially?
In particular I need to claim the working from home allowance for the last 2 years and mileage tax relief from 2018/19 and 2020/21 (employer only refunds 25%).

Thanks for any advice you can give.

Dazed_and_C0nfused

You can't claim them like that.

If there are errors in your previous returns you need to make a claim for overpayment relief for 2018:19 and 2019:20.

https://www.gov.uk/self-assessment-tax-returns/corrections#:~:text=You can make a change,2020 to 2021 tax year

But you are still in time to amend your 2020:21 return.

Letdown69

Dazed_and_C0nfused said:

But you are still in time to amend your 2020:21 return.

Looks like ive timed out on that one as well.

"You can make a change to your tax return 72 hours (3 days) after you’ve filed it, for example because you made a mistake."

I did that one last November.

sheramber

You are not changing your return you want to amend it,
You can amend your return as detailed in the link. 

https://www.simplybusiness.co.uk/knowledge/articles/2021/12/how-to-amend-a-tax-return/#:~:text=Any changes must be made,changes by 31 January 2023