Then I say let him. You have time to make it up. Having a committed partner over the long haul will be worth more than 30K in the long run. Providing, of course, that he doesn't go spending MORE 30K's and MORE 30K's and it's just this one thing. Exact a promise from him that this is the ONLY 30K and maybe you pick up a part-time job or he moonlights to help pay for it. I'm a 60-year-old woman and managed to save plenty for my retirement but didn't start until I was about 40. Should have started earlier, but not having kids really helped. I would let him have this one thing because, in part, this is a particular time in history where some feel strongly about making a statement (I know some in this sub aren't going to like this) about getting off fossil fuel. For some people, it's the one thing they want to do with their lives before everything hits the fan. Hard to explain but if it's just this one thing, I can understand how and why he would want this that strongly and you can make it up. It's not like a toy it's a life's mission. Only you can judge whether he will have one 30K thing after another after another. For this one thing, I wouldn't stand in his way even though I don't do it on my own house. I know this won't be popular but exact a promise that this is the ONLY expensive thing he gets to do before seriously saving for your retirement. And he has to hold to that promise to give up his hobby, sell the stuff, etc. etc. etc.