Unlike FHA loans, not every person who buys a house with a conventional loan is required to pay for mortgage insurance. If you make a down payment of 20% or more, you do not need to pay for PMI. If you make a down payment of less than 20%, you will mostly likely be required to pay for private mortgage insurance by your lender. The cost of PMI is affected by factors like your credit score and the amount of your down payment. The cost can vary from borrower to borrower and generally runs between 0.5% and 2% of the loan amount of the mortgage.