Tony is exactly right about how a lender will view that portion of the contract. Plus, coming from your end, be sure you are willing and able to proceed with the purchase based on ALL the terms stated in the loan contingency section: amount, term, interest rate and points. A couple of points in rate could mean the difference between an affordable mortgage and an unaffordable one. And a point or two in origination fees and discount points could mean the difference between you having enough cash to pay closing fees - or not. So, if you put in an arbitrary number, and the bank will lend based on those rates and points, but not lesser ones that are actually affordable, you could lose your earnest money.