How to Buy a House and When Is the Initial Deposit Due? Earnest Money Deposit. A seller can gauge your willingness and ability to buy the home by Fund Sourcing. When financing your home purchase, your lender ensures that you have Contract Terms. Your real estate contract may require The amount you'll deposit as earnest money will depend on factors such as policies and limitations in your state, the current market, what your real estate agent recommends, and what the seller requires. On average, however, you can expect to hand over 1% to 2% of the total home purchase price.