We've made a terrible mistake and I'm terrified about what's going to happen.
In 2008 during the financial crisis, we were still stuck in our 1 bed flat with our toddler. We hadn't been able to sell but had to get out, it was so tiny that we had mould and damp issues from all the stuff crammed in there. We found a 2 bed flat to rent and left it.
After a while of still not being able to sell, in 2009 we took on tenants. DH tried to register for self assesment several times, but there were technical difficulties each time. He phoned the helpline, who then informed him that because there was nothing left over, he didn't need to do a return and they would just change his tax code. What I know realise is that they were probably assuming that he had an interest only mortgage, which he doesn't.
To make matters worse, looking at his salary, I'm not even sure they made any changes to his tax code. Finally this week, after all these years we have an offer on the flat. It is selling for £34,000 above what he paid for it and my research into capital gains tax has made me realise how bad things are. We were very naive and never wanted to be landlords, we did so out of desperation, but I fear that we have accidentally criminalised ourselves.
Not sure how to get out of this mess, how to approach HMRC or what we need to prepare ourselves for. Any advice welcome.