I'm about to sell a vintage car, but the buyer is paying me cash. I have not initiated a divorce petition yet, but I want to hide the money.

Any advice?

Clarification: We have a house together and I have a sizeable retirement. I want to use the car money as down payment on a new place. I would like to leverage not touching the car money and give her higher percentage in the home's equity and to not touch my retirement (taking some now has drastic ramifications with compounding interest in 20 years).