Loan Approvals and W-2 Jobs

[Manco Snead]

Greetings,

I've been unclear on this part of the loan approval process: Say one gets approved for a loan based on their full time W-2 job. Closing on the property happens, then shortly thereafter he/she has life changes, or whatever, and wants to leave their W-2 job and go to self employed or something other than full time W-2. When can one legitimately leave their job from which they were approved for a loan after closing without having to worry about Fanny or Freddie showing up at their house in the middle of the night?

Much thanks.