Private Mortgage Insurance: When It Is Required

When you put down less than 20% on a conventional home loan, private mortgage insurance protects the lender against your default—and you pay the premiums. The requirement kicks in automatically when your loan-to-value ratio exceeds 80%, and understanding the rules around cost, calculation, and cancellation can save thousands over the life of your mortgage.

Loan-to-Value Ratio and PMI Thresholds

Private mortgage insurance becomes mandatory on conventional loans when the loan-to-value (LTV) ratio exceeds 80%. LTV is calculated by dividing the loan amount by the purchase price (or appraised value, whichever is lower).

If you buy a $400,000 home with a $60,000 down payment, your loan is $340,000—an LTV of 85%. Since that exceeds 80%, the lender will require PMI. At exactly 80% LTV or below, PMI is optional (though some borrowers choose it anyway for other reasons, like portfolio protection).

The 80% threshold exists because historical loan performance data shows that borrowers with at least 20% equity have significantly lower default rates. Below that line, lenders face measurably higher risk and shift some of that risk to an insurance company—with you footing the bill.

How PMI Premium Is Calculated

PMI premiums are expressed as an annual percentage of the loan balance, typically ranging from 0.5% to 1.5% per year, depending on three main factors:

Down payment and LTV: A smaller down payment (higher LTV) means higher PMI. Going from 15% down to 10% down typically increases your premium noticeably. This reflects the lender’s actual risk—a borrower with less skin in the game statistically defaults more often.

Credit score: Borrowers with excellent credit (740+) pay lower rates; those below 620 pay multiples higher. A borrower with a 760 score might pay 0.55% annually on a 95% LTV loan, while one with a 640 score might pay 1.25% on the same LTV.

Loan type: Jumbo mortgages (loans above conforming limits) and investment properties also attract higher PMI rates than primary residences.

Upfront vs. Monthly PMI

Some lenders offer an upfront PMI fee (1–2% of the loan), rolled into the principal, instead of (or in addition to) monthly payments. Upfront fees are paid once; monthly PMI is recalculated based on your declining balance. On a $340,000 loan with 0.9% annual PMI, you might pay roughly $255 per month, or you might pay a $5,100 upfront fee and skip the monthly charge—or pay both, depending on the loan structure. Compare both approaches; lower monthly PMI often makes more sense if you plan to refinance or pay down the principal quickly.

Mandatory Cancellation at 78% LTV

Federal law requires lenders to automatically cancel PMI once your loan balance falls to 78% of the original purchase price (or appraised value at origination, whichever was used). You do not need to request this; it happens automatically when the servicer confirms you’ve hit that threshold. This is called the “termination date” under the Homeowners Protection Act of 1998.

So if you bought that $400,000 home with a $340,000 loan (85% LTV), PMI drops automatically when the balance reaches $312,000. That happens through a combination of principal payments and (if applicable) appreciation confirmed by an appraisal.

This automatic cancellation protects you from paying PMI longer than necessary, even if you don’t track it actively.

Cancellation by Request at 80% LTV

You can also request manual cancellation once you reach 80% LTV, though requirements vary by loan type and servicer. You may need to provide updated evidence of the property’s value (an appraisal), cover associated costs, and have a good payment history. Some loans require that you also have held the mortgage for a minimum period (often two to three years).

This option is useful if you’ve made large extra principal payments or if the home has appreciated significantly and a new appraisal shows lower LTV. Refinancing to eliminate PMI is also an option but makes sense only if you’ve built enough equity and interest rates are favorable.

When PMI Does Not Apply

FHA loans, VA loans (for eligible military members), and USDA rural development loans all have their own insurance or guarantee structures and do not require PMI. FHA loans charge mortgage insurance premiums (MIP), which serve a similar purpose but operate under different rules and are more difficult to remove. VA and USDA loans shift the guarantee entirely to the government, so private insurance is unnecessary.

Conventional loans below 80% LTV also have no PMI, making a 20% down payment a key milestone for many borrowers seeking to avoid it altogether.

The True Cost Over Time

On a $340,000 loan at 0.9% annual PMI, you’d pay roughly $3,060 per year, or $255 per month. Over five years before automatic cancellation, that’s $15,300 in pure insurance cost—money that doesn’t reduce principal or build home equity. This illustrates why even a modest increase in down payment (say, 12% instead of 10%) often justifies the delayed purchase timeline or temporary smaller home.

However, PMI should not prevent you from buying if you are ready financially and emotionally. Paying PMI is preferable to renting while waiting for a 20% down payment you may not accumulate for years. The key is understanding the cost, knowing when it disappears, and planning to eliminate it either through equity buildup or refinancing.

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