If you are requested to provide "proof of income" or your HMRC tax calculation for a previous year(s) for a mortgage or loan application or maybe an insurance loss of earnings claim, you'll need to provide them with an SA302 form.

To find the SA302 download -

1. Go to the "Tax Return" tab

2. Next "Select the year"

3. You will see the green "Download SA302" button

P.S. There are still a few lenders who will only accept an SA302 from HMRC. You can't download it from your HMRC Gateway Account.

Call HMRC on 0300 200 3310 and tell them... "you need an SA302 for (year), that you can't download it from your Gateway Account because you filed using "Recognised" commercial software and your lender won't accept it unless it is from HMRC".

They will post it to you within 5 working days.