When you make an offer, you will need to put up an earnest money deposit as a sign of good faith that you are seriously interested in buying a home. That deposit becomes a part of the purchase price and is held in a trust account until there is full acceptance of the offer. Typically, an earnest money is 3-5% of the offer amount. When you make an offer, you will need to put up an earnest money deposit as a sign of good faith that you are seriously interested in buying a home. That deposit becomes a part of the purchase price and is held in a trust account until there is full acceptance of the offer. Typically, an earnest money is 3-5% of the offer amount.