Private Mortgage Insurance (PMI): insurance purchased by a buyer to protect the lender in the event of default. The cost of mortgage insurance is usually added to the monthly payment. Mortgage insurance is generally maintained until over 20 Percent of the outstanding amount of the loan is paid or for a set period of time, seven years is normal. Mortgage insurance may be available through a government agency, such as the Federal Housing Administration (FHA) or the Veterans Administration (VA), or through private mortgage insurance companies (PMI).