I bought a house recently and I found the mortgage underwriting process to be somewhat ridiculous. My wife had a business loss in 2012, dissolved her law partnership in late 2012, did much better in 2013, and the underwriter still counted her income as NEGATIVE. As in subtracted from my income for underwriting purposes. So even if you have a shiny pre-approval letter, the appraisal and all the inspections look good, and a rational person would say everything is fine, there can still be plenty of drama until the loan actually funds. So I'd definitely suggest holding off on the Tesla until the deal on the house actually closes. At least in my experience, auto lenders are far more reasonable about things.