Mortgage Calculator with PMI

PMI protects the lender, not you

This is the first thing to understand, because it explains why PMI feels like a fee for nothing. Private mortgage insurance pays the lender if you default and the foreclosure sale does not cover the balance. It does not insure your home, your payments, or your job. You pay the premium; the lender is the beneficiary.

In exchange, PMI makes a low-down-payment loan possible at all. Without it, lenders would generally require 20% down. So the real question is not "is PMI bad" but "is getting into the house now worth the cost of the insurance", and that depends on how long you expect to pay it.

On the default figures here — a $400,000 home with 10% down at 6.5% over 30 years — the loan is $360,000, LTV is 90%, and PMI at 0.5% adds $150.00 a month. The total payment is $2,975.44 while PMI applies, dropping to $2,825.44 once it ends.

How long you actually pay it

Most people assume PMI lasts a couple of years. It usually lasts far longer. On these figures it runs 109 months — a little over nine years — and costs $16,350 in total. The reason is that cancellation is tied to your loan-to-value ratio reaching 78%, and with a 30-year schedule the principal barely moves in the early years.

The term makes an enormous difference, because a shorter loan retires principal much faster. On the same 10%-down loan, a 15-year term reaches the cancellation point in 37 months and costs $5,550 in total; a 20-year term takes 57 months and costs $8,550. Same house, same PMI rate — roughly $11,000 of difference purely from how fast the balance amortises.

What moves the cancellation date

• Your down payment. At 15% down PMI runs 75 months and costs $10,625; at 5% down it runs 135 months and costs $21,375.
• Your loan term. Shorter terms hit 78% LTV sooner, which is why the 15-year figure above is roughly a third of the 30-year cost.
• Home price movements. This calculator assumes the value is flat — if prices rise, you can reach 78% much sooner and request cancellation.
• Extra principal payments. Paying down the balance faster moves the date forward in exactly the same way a shorter term does.

Is it worth finding the extra 10%?

Going from 10% down to 20% down on this house takes $40,000 more cash at closing and removes PMI entirely. The payment drops from $2,975.44 to $2,572.62 — a difference of $402.82 a month at the start.

That is roughly an 8.3-year payback on the $40,000, which sounds reasonable until you separate what is in it. Only $150 of that $402.82 is PMI. The other $252.82 is the principal and interest you no longer pay on money you never borrowed — which is not really a saving but a 6.5% risk-free return on cash, the same return you would get from putting the money into the house in any form.

So the honest comparison is narrower than the headline: the case for scraping together 20% rests mostly on avoiding the $16,350 of PMI, not on the $402.82. And that $16,350 has to be weighed against what the $40,000 does if you keep it — an emergency fund, or an investment earning more than 6.5% after tax. If draining your savings to reach 20% leaves you with no buffer, the PMI is often the cheaper risk.

Your credit score sets the rate

PMI is priced per borrower, and the spread is wide — typically 0.3% to 1.5% of the loan per year depending on credit score and down payment. On this $360,000 loan that range is dramatic:

• At 0.3% — $90.00 a month, $9,810 in total over 9.1 years.
• At 0.5% — $150.00 a month, $16,350 in total.
• At 1.0% — $300.00 a month, $32,700 in total.
• At 1.5% — $450.00 a month, $49,050 in total.

The gap between the best and worst tier is about $360 a month and nearly $40,000 over the life of the premium. If your score is borderline, raising it before you apply is usually worth more than any negotiation on the rate itself — and unlike the interest rate, PMI pricing is not something you can refinance your way out of if you also keep the loan.

FHA insurance works differently, and often worse

Do not assume the rules here carry over to government-backed loans. FHA loans charge an upfront mortgage insurance premium plus an annual premium, and for loans originated with less than 10% down the annual premium typically runs for the entire life of the loan. There is no 78% cancellation.

That makes a low-down-payment FHA loan materially more expensive over time than the PMI case modelled here, and refinancing into a conventional loan is usually the only way out. If you are comparing an FHA quote against a conventional one with PMI, compare the total monthly cost and the expected duration of the insurance, not just the headline rate.

Lender-paid PMI: the version that never ends

Some lenders offer lender-paid mortgage insurance, where there is no separate PMI line and instead you accept a slightly higher interest rate. It is sometimes marketed as "no PMI", which is misleading — you are still paying for the insurance, just through the rate.

The critical difference is that it cannot be cancelled. Once you pass 78% LTV the premium does not fall away, because it is baked into the rate for the life of the loan. On a loan you expect to hold for decades, that can cost more than borrower-paid PMI that disappears after nine years. It only tends to make sense if you expect to refinance or sell relatively soon.

Getting PMI removed early

You do not have to wait for the automatic cancellation date. There are three routes, and they are worth knowing because the scheduled date is calculated on the assumption that your home value never changes.

• Automatic termination at 78% LTV. Servicers must end PMI at this point on most conventional loans, provided payments are current. This is what the calculator models.
• Requested cancellation at 80% LTV. You can ask your servicer to cancel once you reach 80% based on your original amortisation schedule — a good payment history is usually required.
• Cancellation based on a new appraisal. If the home has risen in value, or you have made substantial improvements, a new valuation can put you under 80% well ahead of schedule. This is the option most people overlook, and in a rising market it is often the one that saves the most.

This calculator holds the home value flat, which is the conservative assumption. If prices in your market have moved since you bought, your real cancellation date may be considerably earlier than the figure shown — and a conversation with your servicer costs nothing.