Private Mortgage Insurance (PMI): Cost, LTV and When It Can End

Private mortgage insurance, or PMI, is easy to think of as a penalty for putting less than 20% down. That framing is incomplete.

PMI can be a cost of obtaining certain conventional mortgage financing with a smaller equity cushion. It generally protects the lender, not the borrower, if the loan defaults.

The right question is not simply “How do I avoid PMI?” It is:

What does PMI cost, what does a larger down payment cost me in liquidity, and what rules apply to ending the insurance on this specific loan?

Start with loan-to-value

Loan-to-value, or LTV, compares the mortgage balance with a property value used for the calculation.

For a simple purchase example:

• home value: $500,000;
• mortgage: $450,000.

The simplified original LTV is:

$450,000 ÷ $500,000 = 90%

A 10% down payment therefore starts with more leverage than a 20% down payment.

Why PMI can still be rational

Suppose putting 20% down would use nearly all of your liquid savings.

Avoiding PMI might reduce the monthly housing cost, but it could also leave the household with little emergency cash after closing.

A lower down payment plus PMI can sometimes preserve liquidity for:

• emergency reserves;
• repairs;
• moving costs;
• childcare;
• renovations; or
• other high-priority obligations.

That does not make PMI automatically good. It means the comparison should include both monthly cost and cash retained.

The 80% request concept

For many mortgages covered by the federal Homeowners Protection Act, a borrower can generally request cancellation when the principal balance is scheduled to reach 80% of the home's original value, subject to statutory and servicer conditions.

Conditions can include requirements related to:

• payment history;
• whether the borrower is current;
• certifications about junior liens; and
• evidence that the property's value has not declined, depending on the circumstances.

Do not treat “80%” as an automatic cancellation button.

The scheduled 78% automatic-termination concept

For many eligible loans, automatic termination can generally occur when the scheduled principal balance reaches 78% of the original value if the borrower is current, subject to the applicable law and loan conditions.

The key word is scheduled.

Making extra principal payments can reduce the balance faster, but the legal automatic-termination date and borrower-request process need to be understood separately.

There is also a midpoint termination rule that can matter in some circumstances.

FHA and VA are different

Do not apply conventional PMI rules to every mortgage.

FHA loans use mortgage-insurance rules that can depend on the loan's characteristics and origination terms. VA loans have different funding-fee and guaranty structures.

If you have an FHA or VA loan, start with the rules for that program rather than a conventional PMI checklist.

Worked example: scheduled balance milestones

Assume:

• original value: $500,000;
• original conventional mortgage: $450,000;
• 30-year term;
• 6% interest rate; and
• $200 monthly PMI for illustration.

The 80% original-value balance is:

$400,000

The 78% original-value balance is:

$390,000

MFA can calculate when the normal amortization schedule is expected to cross those balances.

That gives you useful planning dates, but it does not determine that your servicer must cancel PMI on exactly those dates. Loan type, payment history and other conditions still matter.

PMI cost should be modeled in dollars

If PMI is $200 per month, a one-year cost is $2,400.

If the loan reaches a relevant cancellation milestone after several years, the cumulative dollars can become meaningful.

But compare that amount with what a larger down payment would require.

If avoiding PMI requires another $50,000 at closing, ask:

• How much emergency cash would remain?
• Would the lower loan amount reduce interest meaningfully?
• What return or liquidity are you giving up on the extra cash?
• Would the additional down payment change the mortgage rate or only the PMI?

Appreciation is a separate issue

Home appreciation can create more current equity, but federal PMI cancellation rules use specific definitions and procedures.

Do not assume Zillow-style estimated appreciation automatically eliminates PMI.

Some servicers or investors may have procedures involving current value, seasoning and appraisal requirements. Ask the servicer what process applies to your loan.

Common PMI mistakes

“I hit 20% equity, so PMI disappears automatically.”

Borrower-requested cancellation and automatic termination are not the same process.

“Extra principal automatically changes my monthly mortgage payment.”

Normal extra principal reduces balance and interest but generally does not recast the scheduled payment unless the loan is formally recast or modified.

“PMI means the loan is bad.”

It is a financing cost. Its value depends on the alternative use of the down-payment cash and the total mortgage economics.

“FHA mortgage insurance is PMI.”

The programs and cancellation rules differ.

A practical PMI review

1. Identify the loan type.
2. Find the original value used for the applicable PMI rules.
3. Find the scheduled 80% and 78% balance milestones.
4. Review the monthly PMI cost.
5. Ask the servicer for the exact cancellation process and conditions.
6. If considering extra principal, model interest savings and liquidity separately.
7. Keep post-closing emergency reserves in the decision.

PMI should be treated as a line item in the financing structure—not as a moral judgment about how large your down payment should be.