What Is PMI and How the 80/10/10 Mortgage Avoids It

If you can't pull together a full 20% down payment, PMI feels like a penalty for being a normal buyer. With 2026 median home prices near $410,000, a 20% down payment is over $82,000 - out of reach for many. This guide explains exactly what PMI costs, how to get rid of it, and whether the 80/10/10 workaround actually saves you money or just shuffles the cost around.

What is PMI (private mortgage insurance)?

PMI is an insurance premium that conventional lenders require when your down payment is below 20% of the home's value. Despite the name, it doesn't protect you - it protects the lender against the higher risk of lending to a buyer with less equity in the home.

Here's the logic. If you default and the lender has to foreclose, a smaller down payment means less of a cushion to cover their losses. PMI offsets that risk. You pay it monthly, bundled into your mortgage payment, and the money does nothing to build your equity.

The cost depends on your loan size, credit score, and down payment. As of 2026, premiums generally run between 0.46% and 1.5% of the loan amount per year (Urban Institute, 2026). On a $300,000 loan, that's roughly $1,380 to $4,500 a year - about $115 to $375 a month. Borrowers with higher credit scores pay toward the low end; lower scores pay more.

Credit scores and down payments: what PMI costs

Conventional PMI rates vary by insurer; the illustrative ranges below span roughly 0.2% to 2.0% of the loan amount, wider than the typical 0.46% to 1.5% band cited above, because they cover the full spread of credit and LTV combinations. Lenders calculate your rate based on three variables: your credit score, your Loan-to-Value (LTV) ratio (the percentage of the home price you borrow), and your Debt-to-Income (DTI) ratio.

The table below illustrates typical conventional annual PMI rate ranges based on credit score and LTV:

To understand how this affects your monthly budget, consider buying a $400,000 home with a 10% down payment ($40,000), resulting in a $360,000 loan amount.

• Buyer A (780 Credit Score): Qualifies for an estimated PMI rate of roughly 0.30% (high-credit bracket). The annual cost is $1,080, which is exactly $90.00 a month.
• Buyer B (670 Credit Score): Receives an estimated PMI rate of roughly 1.10% (lower-credit bracket). The annual cost is $3,960, which is exactly $330.00 a month.

Over the first 5 years of the loan, Buyer A pays $5,400 in premiums, while Buyer B pays $19,800 for the exact same home and loan size. Improving your credit score before shopping for a mortgage represents a very high financial return.

Tax deductibility of PMI

The tax status of mortgage insurance has shifted, but it is currently highly favorable for eligible taxpayers:

• The Statute: The mortgage insurance premium deduction was permanently reinstated by the One Big Beautiful Bill Act (OBBBA), Public Law 119-21, Section 70108, signed July 4, 2025, effective for tax year 2026 (first claimed on 2026 returns filed in 2027). The primary citation is OBBBA Section 70108 (Public Law 119-21), paired with IRS Publication 936. Note that the currently published text of Publication 936 may still read "expired" because it lags the OBBBA change, so the statute remains the authoritative anchor until the 2026 revision is posted.
• Filing Method: The deduction is claimed on IRS Schedule A as qualified residence interest, meaning the taxpayer must itemize deductions.
• Coverage: The deduction covers conventional PMI, FHA mortgage insurance premiums (MIP), VA funding fees, and USDA guarantee fees.
• Amortization Rules: Monthly premiums are deductible in the year paid. Upfront premiums (for example, FHA Upfront MIP) are amortized over the shorter of the actual loan term or 84 months.
• Retroactive Exclusion: Premiums paid in tax years 2022 through 2025 are NOT deductible, as the provision was expired during that window.
• Phase-Out: The deduction phases out at higher income levels and is eliminated above an upper income threshold. The exact income thresholds are set in the current IRS Schedule A instructions; consult those instructions and a qualified tax professional for your situation.

Always consult a qualified tax professional before claiming deductions on your tax return.

How to avoid or remove PMI step by step

You have several ways to skip PMI entirely or shed it as fast as possible. Here's how to think through them.

1. Put 20% down if you can. The cleanest route. A 20% down payment means no PMI from day one. On a $410,000 home, that's $82,000 - a high bar, which is why most buyers look at the options below.

1. Use an 80/10/10 piggyback loan. Split financing into an 80% first mortgage, a 10% second mortgage (often a HELOC or fixed second), and a 10% down payment. Because the first mortgage is exactly 80% loan-to-value, no PMI is required. More on the math below.

1. Request removal at 20% equity. Once your balance drops to 80% of the home's original value, you can ask your lender in writing to cancel PMI. Strong payment history helps.

1. Know your automatic cancellation point. By federal law, PMI is automatically removed once your balance reaches 78% of the original value (22% equity), assuming you're current on payments. You don't have to ask.

1. Pay down principal faster. Extra principal payments accelerate the date you hit 20% and 22% equity. A reappraisal after home-value gains can also get you there sooner.

1. Consider a lender-paid PMI loan. Some lenders cover PMI in exchange for a slightly higher interest rate. This can work short-term but costs more if you keep the loan many years, since the higher rate never goes away.

→ Use our free Mortgage Calculator at GlobalUtilityHub to compare a PMI loan against an 80/10/10 split - no sign-up needed.

Real example: 80/10/10 vs paying PMI

Dana is buying a $410,000 home and has $41,000 saved - exactly 10% down. She has two realistic options.

Option A - One loan with PMI. She borrows $369,000 (90% of the price) at 6.51%. Her principal and interest is about $2,335 a month. With PMI at roughly 0.8%, she adds about $246 a month. Her total: around $2,581 a month until she reaches 20% equity and PMI drops off.

Option B - 80/10/10 piggyback. She takes a first mortgage of $328,000 (80%) at 6.51% - about $2,076 a month - plus a second loan of $41,000 (10%). Seconds carry higher rates; at, say, 8.5% on a fixed second, that's roughly $315 a month. Her total: around $2,391 a month, with no PMI.

In this scenario, the 80/10/10 saves Dana about $190 a month. The interest on both loans may also be tax-deductible, whereas PMI deductibility depends on income limits.

But it's not automatically the winner. Second mortgages often have variable rates that can rise, and you're managing two loans instead of one. If the second loan's rate is high enough, the piggyback can cost more than just paying PMI - especially since PMI eventually disappears while a second mortgage sticks around until you pay it off. The decision hinges entirely on the second loan's rate and terms, which is exactly why you should run both scenarios with real quotes before choosing.

PMI and 80/10/10 by the numbers

Here's Dana's $410,000 purchase with 10% down, comparing the two paths.

The 80/10/10 looks cheaper here, but the gap closes - and can reverse - if the second loan's rate is higher or variable. Always compare with your actual quoted rates.

Common mistakes to avoid

Assuming PMI is permanent. It isn't. PMI cancels automatically at 78% loan-to-value, and you can request removal at 80%. Many homeowners keep paying it for years simply because they never asked.

Confusing PMI with homeowners insurance. They're unrelated. Homeowners insurance protects your property and belongings; PMI protects the lender against your default. You may pay both, and dropping one has no effect on the other.

Ignoring the second loan's rate in an 80/10/10. The piggyback only saves money if the second loan's rate is reasonable. A high or rising variable rate on the second can erase the savings entirely.

Forgetting PMI eventually disappears. When comparing against an 80/10/10, remember PMI is temporary - it ends at 22% equity - while a second mortgage lasts until you pay it off. Factor in how long you'll actually hold the loan.

Overlooking lender-paid PMI's long-term cost. Lender-paid PMI swaps the monthly fee for a permanently higher rate. It can win if you sell or refinance soon, but it's expensive if you keep the loan for the long haul.

The bottom line

PMI is the price of buying with less than 20% down on a conventional loan, costing most buyers a few hundred dollars a month that builds no equity. The good news is it's temporary - it cancels at 22% equity - and you have ways around it, including the 80/10/10 piggyback structure. Just don't assume the workaround is automatically cheaper; the second loan's rate decides whether it actually saves you money.

The smartest move is to model both paths with your real numbers before you commit. Our Mortgage Calculator lets you compare a PMI loan against an 80/10/10 split in under 30 seconds - try it free at globalutilityhub.com/calculators/mortgage-calculator/.