HOW MUCH CASH? How much money do you need to buy a house? Some loan programs offer no money down loans, while others require 3.5%, 5%, or 10% down. Some low downpayment loans require mortgage insurance. And in addition to the down payment, there are closing costs and prepaid expenses. The rules can be complicated and the formulas are complex - that's why I did the math for you. Simply search for you target home and click on the Estimates tab to see the minimum down payment for each type of loan and the associated costs. If you change the purchase price, the type of loan, or the down payment, then of all the costs will recalculate instantly.