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- PMI usually applies to conventional mortgages when the down payment is below 20%.
- PMI protects the lender, not the borrower, but it can make a smaller down payment possible.
- The monthly cost is commonly estimated from the loan amount and an annual PMI rate.
- PMI is different from FHA mortgage insurance, which follows different rules.
- Borrowers should ask how PMI can be canceled before choosing a loan.
Introduction
Private mortgage insurance, usually called PMI, is one of the most misunderstood costs in home buying. Many buyers first see it as a small extra line item on a loan estimate, but it can change the total monthly payment, the cash needed to buy, and the tradeoff between buying now and waiting to save more.
This guide explains PMI in practical language. It is written for buyers who want to understand what PMI does, when it applies, how to estimate it, when it may end, and how to compare options without getting lost in lender jargon.
This guide is for first-time buyers, repeat buyers using a smaller down payment, homeowners reviewing a refinance, and anyone comparing a conventional loan with FHA or other mortgage options.
What Is PMI?
PMI is private mortgage insurance. It is most often associated with conventional mortgages where the borrower puts down less than 20%. The policy is arranged as part of the loan, but its main purpose is to reduce risk for the lender.
That distinction matters. PMI can help a borrower qualify with less cash upfront, but it does not make missed payments safe. If the borrower stops paying the mortgage, PMI does not prevent foreclosure, protect credit, or reimburse the borrower.
When PMI Applies
PMI commonly appears when the loan-to-value ratio is above 80%. In plain English, that usually means the buyer has less than 20% down on a conventional mortgage.
For example, if a buyer purchases a $400,000 home with $40,000 down, the loan amount is $360,000. The down payment is 10%, and the loan-to-value ratio is 90%. That type of conventional loan will commonly include PMI.
Do not ask only, "Can I avoid PMI?" Ask, "What is the full monthly payment with PMI, and what would I give up to avoid it?" Sometimes preserving cash reserves is more valuable than reaching 20% down immediately.
When PMI Ends
PMI is not always permanent. Borrower-paid PMI on many conventional loans can often be requested for cancellation when the loan reaches roughly 80% loan-to-value, subject to loan rules and servicer requirements. Automatic termination may happen later under required rules if the loan is current and eligible.
The details matter. Some servicers use the original value, some may require a formal request, and some may require proof that the property value supports cancellation. If home values rise, a borrower may ask whether a new valuation can help. If the loan balance falls through regular payments or extra principal payments, the borrower may reach the target sooner.
PMI vs. Mortgage Insurance
People often use mortgage insurance as a broad phrase, but PMI is only one type. PMI usually refers to private mortgage insurance on conventional loans. FHA loans use mortgage insurance premiums, often called MIP. VA and USDA loans have their own funding fee or guarantee fee structures.
| Type | Common loan | Who it protects | How it may behave |
|---|---|---|---|
| PMI | Conventional loan | Lender | May be cancelable when equity requirements are met. |
| FHA MIP | FHA loan | FHA insurance fund/lender system | Often includes upfront and annual premiums with separate rules. |
| VA funding fee | VA loan | VA loan program | Not PMI, but can affect upfront or financed costs. |
| USDA guarantee fee | USDA loan | USDA loan program | Not PMI, but can affect payment and total loan cost. |
PMI Cost Examples
A simple PMI estimate uses this formula: loan amount multiplied by annual PMI rate, divided by 12. The actual PMI rate can depend on down payment, credit profile, loan structure, and lender or insurer pricing, but this formula helps buyers compare scenarios before they receive exact quotes.
| Home price | Down payment | Loan amount | PMI rate | Estimated monthly PMI |
|---|---|---|---|---|
| $350,000 | 5% | $332,500 | 0.60% | About $166 |
| $400,000 | 10% | $360,000 | 0.50% | About $150 |
| $500,000 | 15% | $425,000 | 0.35% | About $124 |
These are examples, not quotes. Use the PMI Calculator to test your own assumptions, then confirm actual numbers with a lender.
Worked Scenarios
Scenario A: Smaller down payment, PMI included
A buyer purchases a $400,000 home with 10% down. The loan amount is $360,000. At a 0.50% estimated PMI rate, PMI is about $150 per month. The buyer keeps more cash available but accepts a higher monthly payment.
Scenario B: Larger down payment, no PMI
The same buyer waits until they can put 20% down. The loan amount drops to $320,000, and PMI may not be required. The monthly payment can be lower, but the buyer needs $40,000 more upfront compared with the 10% down scenario.
Scenario C: Use PMI temporarily
A buyer chooses a smaller down payment, tracks the loan balance, and plans to request PMI cancellation later. This can work well when the payment is comfortable and the buyer understands the cancellation process before closing.
Do not drain emergency savings just to avoid PMI. A no-PMI payment can still become stressful if the buyer has no cash left for repairs, moving costs, job changes, or surprise expenses.
Common PMI Mistakes
- Looking only at the home price instead of total monthly housing cost.
- Assuming PMI protects the borrower.
- Comparing loans without including PMI, taxes, insurance, HOA, and closing costs.
- Forgetting to ask how PMI can be canceled.
- Using all savings for down payment and leaving no reserves.
- Assuming FHA mortgage insurance and conventional PMI follow the same rules.
Expert Tips
- Ask for the PMI rate, payment method, and cancellation rules in writing.
- Compare 5%, 10%, 15%, and 20% down scenarios instead of only one option.
- Use the Mortgage Calculator to see the full payment, not only PMI.
- Use the Down Payment Calculator to see how much more cash is needed to reach a target down payment.
- Read Lesson 4: How Much House Can I Afford? and Lesson 5: Understanding PITI before deciding on a maximum budget.