As background, DH and I have separate finances, I know MN don't tend to like it but he's been stung in previous relationships but is also terrible with money and so has a poor credit score. Keeping things separate suits him and suits me because I keep my credit rating and have a rainy day fund to bail us out as a family when needed and we both know our individual financial responsibilities. We earn similar amounts.
The issue now is that, because he's self employed, he has his tax bill for the year. It is more than he expected and he's really worried about paying it. He has put nothing aside over the last year and has also spent the whole of a modest inheritance. (We both have kept working during the pandemic.) Over the last 5 years he has also slightly changed his job with no planning or discussion with me to one that is significantly lower paying and has gradually reduced the number of days he works to one a week, again with no input from me. I have increased my hours and my contribution to the mortgage but it is not enough to offset the drop in his earnings, hence the problem with the tax bill. He probably earns the same as me doing one day a week as I do working full time.
We have recently started building an extension, which I am paying for alone, but now seems the height of foolishness given the issue with his income. Had we not done it, I could pay his tax bill from my savings with plenty to spare but now I can't. I don't have access to his financial information so I didn't know how bad it was, but he was aware of the planned building work and agreed we'd go ahead.
I could help out with the tax bill, but I don't feel it's my responsibility. He choses to work one day a week, and knows his financial obligations. He could easily increase his work as his job is in short supply. He also has a vanity car (plus another car for regular use) he can sell to cover the majority of the bill.
Obviously if it comes down to us potentially losing the house or having bailiffs round, I will pay up, but I don't want him to think he can be this financially irresponsible and I'll just bail him out when this situation is entirely by his choice. He is very very worried though.
AIBU?