How do mortgage lenders determine the need for private mortgage insurance (PMI)?

Private mortgage insurance, or PMI, is a policy that protects the lender if a borrower stops making payments on a conventional mortgage loan. Lenders require PMI when the borrower makes a down payment of less than 20 percent of the home's purchase price, because the lower equity stake represents a higher risk for the lender.

To determine whether PMI is needed, lenders evaluate the loan-to-value ratio, or LTV. This ratio compares the loan amount to the appraised value of the home. A down payment of 20 percent results in an LTV of 80 percent or lower, which is considered low risk. Any down payment below that threshold pushes the LTV above 80 percent, triggering the PMI requirement.

How lenders calculate the LTV for PMI

The calculation is straightforward. The lender takes the loan amount and divides it by the lesser of the purchase price or the appraised value of the property. For example, on a $300,000 home with a $15,000 down payment (5 percent down), the loan amount is $285,000. The LTV is 95 percent. Since this exceeds 80 percent, the borrower will need PMI.

Lenders also consider the combined loan-to-value ratio, or CLTV, if the borrower is taking out a second mortgage or a home equity line of credit simultaneously. The CLTV includes all loans secured by the property, and exceeding 80 percent can also trigger PMI requirements.

Key factors that influence PMI

• Down payment amount: The larger the down payment, the lower the LTV and the less likely PMI is required. A 20 percent down payment eliminates the need for PMI entirely.
• Credit score: Borrowers with higher credit scores may qualify for lower PMI premiums, even though the requirement still applies if the LTV is above 80 percent.
• Loan type: PMI only applies to conventional loans. Government-backed loans like FHA loans require mortgage insurance premiums (MIP) regardless of down payment size, while VA loans and USDA loans have their own guarantee fees.
• Loan-to-value ratio at closing: The initial LTV at the time of purchase determines whether PMI is added to the monthly payment.

How PMI is canceled or removed

Once a borrower reaches 20 percent equity in the home, they have the right to request cancellation of PMI. Under the Homeowners Protection Act, the lender must automatically terminate PMI when the LTV reaches 78 percent of the original property value, provided the borrower is current on payments. Borrowers can also accelerate this process by making extra principal payments to increase equity faster.

It is important to note that PMI is not permanent. As equity grows and risk decreases, the borrower can eventually remove it, reducing monthly housing costs.

For your specific situation, consult a licensed loan officer who can review your down payment, credit profile, and loan options to determine whether PMI will apply and how to manage it effectively.