Get copies of the tax returns and read them. Taxes are not mysterious. You list the income from self employment, subtract the expenses and come up with the profit.
From there you get to subtract exemptions and deductions. Then you take that number and look on a chart. I'd cetainly want to double check those returns. He could owe that much, depending on what he made.

Well he was arrested the next morning, right? Sounds like a likely scenario.

He got arrested after making a home video in which he trolled Greta Thunberg, the climate activist. He said bring me the pizza and don't recycle the box. He posted this video on Twitter while in hiding in Romania from his sex trafficking charges. The people responsible for finding him watched that video and probably found him from the pizza box identification. He was arrested the next day. Greta posted on Twitter, "this is what happens when you don't recycle your pizza box" He didn't have to interact with Greta at all, he started the exchange and he kept it going. So, Greta for the win.

I didnt read over the budget numbers. With that said, you're needing a reliable car, check. You're getting married, congrats, check. Why do you have to buy a house now? I say postpone that a year or two.