Thank you very much. Something I forgot to mention - my husband has received an email 'Self Assessment - 100 Days to Go' from email@example.com. It's just a reminder, but he hasn't been notified he has to complete one in the first place. Would he have received an official letter? I've looked at the list of genuine email addresses on HMRC but the email address is not on there.
He has always been in permanent employment and only asked to do a self assessment in 2017 when he took voluntary retirement. When we completed and paid the Capital Gains (individually as a joint ownership), it did say something about a self assessment may be needed but I assumed we would be notified. I'm worried if he doesn't do one he will get a big fine, but is that possible if he didn't know to do one. He gets tax deducted from his pension.
Also, he has ended up with two accounts for logging in. One which he set up when he was asked to do a tax return in 2017 and a latest one when we did the Capital Gains Tax submission, which is Government Gateway. When he logs into this, the latest one, he is told he has to log into the other one so the record of the Capital Gains that was completed cannot be viewed if needed.
Thank you again