Buyers need to be aware that it is a very bad idea to increase their credit balances or to open new lines of credit shortly before they close escrow on their new home. More specifically, they should avoid such activity during the period of time between loan application and closing. This is because policies under Fannie Mae’s Loan Quality Initiative, effective June 1, 2010, requires lenders to “refresh” a borrower’s credit report just prior to closing.

Realty Times – Buyers Should Be Careful About Credit Use Prior to Closing.