What Is Private Mortgage Insurance?
Private mortgage insurance (PMI) is a type of insurance policy that protects the lender—not the borrower—against financial loss in the event the borrower defaults on a conventional mortgage. It is required when the loan-to-value ratio at origination exceeds 80%, meaning the borrower has made a down payment of less than 20%.
PMI allows borrowers to purchase homes with smaller down payments than the conventional 20% threshold, providing lenders with loss coverage that compensates for the higher default risk associated with lower-equity positions. The cost is borne by the borrower in the form of monthly premiums, though the policy benefit flows entirely to the lender.
When PMI Is Required
PMI applies to conventional loans with LTV ratios above 80% at origination. It is not required on:
- FHA loans (which carry their own mortgage insurance premium, or MIP, structured differently)
- VA loans (which use a funding fee in lieu of insurance)
- USDA loans (which use guarantee fees)
- Conventional loans with 20% or more down payment
- Jumbo loans (which typically require 20% down and do not offer conventional PMI)
How PMI Is Priced
PMI premiums are determined primarily by two factors:
Loan-to-value ratio: Higher LTV means more lender risk, which translates to higher PMI cost. An LTV of 90% (10% down) carries a lower PMI rate than an LTV of 97% (3% down).
Credit score: PMI providers apply risk-based pricing similar to mortgage lenders. Higher credit scores indicate lower default probability and command lower PMI rates. A borrower with a 760 score will pay significantly less PMI than a borrower with a 640 score at the same LTV.
Annual PMI rates typically range from 0.2% to 2.0% of the loan amount, paid monthly. At 0.6% annually on a $350,000 loan, PMI adds approximately $175/month. At 1.2%, it adds $350/month. These amounts are meaningful additions to the total housing cost and should be factored into affordability analysis and loan program comparison.
PMI Structures
PMI is not a single product. Several structures exist:
Borrower-paid monthly PMI (BPMI): The most common structure. The borrower pays a monthly premium added to the mortgage payment. Cancellable under the Homeowners Protection Act.
Borrower-paid single-premium PMI: The borrower pays the entire PMI cost upfront as a lump sum at closing or rolls it into the loan balance. Eliminates the monthly payment but requires more upfront cash or a higher loan balance. This can be useful when closing cost funds are available but ongoing cash flow is a concern.
Lender-paid PMI (LPMI): The lender pays the PMI premium in exchange for a higher interest rate on the loan. This eliminates the separate PMI payment but embeds the insurance cost in the rate. Because the rate is fixed, LPMI cannot be canceled when equity reaches 20%—the higher rate persists unless the borrower refinances.
Split-premium PMI: Combines an upfront payment with a reduced monthly premium. The upfront portion can sometimes be seller-paid as part of the transaction.
Cancellation Under the Homeowners Protection Act
The Homeowners Protection Act (HPA), effective since 1999, establishes clear rights for PMI cancellation on conventional loans originated on or after July 29, 1999:
Borrower-requested cancellation: The borrower may request cancellation in writing when the loan balance reaches 80% of the original appraised value. The lender must cancel if:
- The request is made in writing
- The borrower is current on payments
- The borrower has a good payment history (no payments 60+ days late in the past two years, no payments 30+ days late in the past year)
- The lender confirms current value has not declined
Automatic cancellation: The lender must automatically cancel PMI when the balance falls to 78% of the original value based on the original amortization schedule, assuming the borrower is current.
Final termination: Regardless of loan balance, PMI must be canceled at the midpoint of the loan term (15 years on a 30-year loan) if the borrower is current, even if the 78% threshold has not been reached.
Accelerating PMI Removal
Borrowers can potentially eliminate PMI ahead of schedule through:
Extra principal payments: Paying down the loan faster reaches the 80% LTV threshold sooner. Every extra dollar of principal reduces the balance toward the cancellation point.
Home appreciation: If the home's value has increased substantially, a new appraisal may demonstrate that the current LTV is below 80% even without extra payments. Many lenders allow this but may require seasoning (the loan being in place for at least 2 years) and a borrower-paid appraisal. Policies vary by lender.
Refinancing: A refinance resets the loan based on a new appraised value. If the home has appreciated, the new loan may be structured at an LTV of 80% or below, eliminating PMI from the new loan.
PMI vs. a Piggyback Loan
Some borrowers avoid PMI by using a "piggyback" loan structure: an 80% first mortgage plus a second mortgage (or HELOC) to cover part of the remaining balance. An 80-10-10 structure uses 80% first mortgage + 10% second mortgage + 10% down payment.
The second mortgage typically carries a higher rate than the first, so the all-in cost must be compared against the PMI cost to determine which is more economical. Piggyback structures can be advantageous when the combined rate cost is lower than PMI, and when the second mortgage is a HELOC that can be paid down quickly to eliminate that lien.
Common Misconceptions
PMI protects the borrower. PMI protects the lender. If a borrower defaults and loses their home, PMI compensates the lender for losses—the borrower still loses the property and any equity.
PMI is permanent. On conventional loans, PMI is cancellable. FHA MIP behaves differently and may persist longer, which is a material distinction when comparing loan types.
All PMI is bad. PMI has a cost, but it enables buyers to purchase homes with less than 20% down, which allows earlier market entry. The question is whether the cost is worth the benefit of earlier ownership, which depends on market conditions, appreciation expectations, and individual circumstances.
AI Tools and PMI Analysis
AI platforms can model PMI scenarios, calculate the break-even for different down payment levels, and compare total cost of ownership across loan structures. Approval AI and Securelend Agents support mortgage program comparison. Homescore and Moveorinvest provide homeownership cost modeling.
See AI tools for first-time home buyers financing for decision-stage tools. Compare advisory platforms at ChatRealtor vs Whiterook. Broader context appears in the 2026 AI tools guide.