80-10-10 Mortgage: How Piggyback Loans Work

What is an 80-10-10 mortgage?

An 80-10-10 mortgage is a home financing structure that uses two loans plus a down payment:

• 80% of the purchase price is covered by a first mortgage
• 10% is covered by a second mortgage, often a home equity loan or HELOC-style second lien
• 10% comes from the buyer’s down payment

This is sometimes called a piggyback loan because the smaller second mortgage “piggybacks” on top of the main first mortgage.

The most common reason borrowers look at an 80-10-10 mortgage is to avoid private mortgage insurance, or PMI, on a conventional loan. PMI is typically required when a conventional first mortgage is above 80% loan-to-value. By keeping the first mortgage at 80%, the borrower may be able to avoid monthly PMI — but they are taking on a second loan instead.

That tradeoff matters. An 80-10-10 mortgage can be useful in the right situation, but it is not automatically cheaper or easier than a single mortgage with PMI.

How the 80-10-10 structure works

Here is a simple example using percentages only:

• Home purchase price: 100%
• First mortgage: 80%
• Second mortgage: 10%
• Down payment: 10%

The first mortgage is usually a conventional loan. If you are comparing conventional financing options, it helps to understand the basics of conventional loans, including down payment, PMI, credit, and debt-to-income guidelines.

The second mortgage may have a different rate, repayment term, payment type, or adjustment structure than the first mortgage. Some second liens are fixed-rate loans. Others may be variable-rate lines of credit. Because the second loan sits behind the first mortgage, it can carry different risk and pricing for the lender.

Borrowers qualify for both loans. That means the lender will review credit, income, assets, property details, and the combined monthly payment. Even though the first mortgage is only 80% of the purchase price, the total financing is still 90% when the second mortgage is included.

Why borrowers consider an 80-10-10 mortgage

Avoiding monthly PMI

The biggest appeal is the potential to avoid monthly PMI on a conventional first mortgage. PMI can be a reasonable cost in many cases, especially if it allows a buyer to purchase with less cash down. But some borrowers prefer a second mortgage structure if the combined payment and long-term cost look better.

The key is to compare the full picture: first mortgage payment, second mortgage payment, closing costs, PMI alternatives, and the expected time in the home.

Keeping more cash available

Some buyers could put 20% down but would rather keep cash available for reserves, renovations, moving costs, or emergencies. An 80-10-10 mortgage may allow a buyer to bring 10% down instead of 20%, while still keeping the first mortgage at 80% loan-to-value.

This can be especially relevant for buyers moving into older homes that may need updates after closing, or for borrowers who do not want to drain savings to hit a 20% down payment.

Managing loan limits or jumbo financing

In higher-priced markets, piggyback financing is sometimes used to structure a loan around conventional or jumbo guidelines. For example, a borrower may explore a first mortgage amount that fits a particular program, with a second lien filling part of the gap.

This is not a one-size-fits-all strategy. If the purchase price or loan amount is above standard conventional ranges, it is worth comparing an 80-10-10 structure with jumbo loan options, because pricing, reserves, documentation, and approval guidelines can differ.

80-10-10 mortgage vs. a conventional loan with PMI

A common mistake is assuming “no PMI” always means “lower cost.” That is not always true.

With a single conventional mortgage and PMI, the borrower has one loan and one main mortgage payment. The PMI cost may eventually be removable when the borrower meets the applicable equity and payment-history requirements.

With an 80-10-10 mortgage, there may be no monthly PMI on the first mortgage, but there is a second mortgage payment. The second loan may have a higher rate than the first mortgage, and if it is variable, the payment can change over time.

When comparing the two, ask for a side-by-side estimate that shows:

• Monthly payment for the first mortgage
• Monthly payment for the second mortgage, if applicable
• PMI cost, if applicable
• Estimated closing costs for one loan vs. two loans
• Whether the second mortgage rate or payment can adjust
• How long you expect to keep the home or loan
• How quickly you expect to pay down the second lien

The Consumer Financial Protection Bureau’s mortgage tools and explanations can also help borrowers understand loan estimates, payments, and mortgage shopping basics.

Pros of an 80-10-10 mortgage

An 80-10-10 mortgage can offer several potential advantages:

• Possible PMI avoidance: The first mortgage stays at 80% loan-to-value.
• Lower down payment than 20%: The borrower brings 10% down instead of the full 20%.
• Cash flexibility: More savings may remain available after closing.
• Potential jumbo strategy: It may help some borrowers compare alternatives for higher-priced homes.
• Separate payoff path: Some borrowers focus on paying off the second lien faster than the first mortgage.

These benefits depend on the actual loan terms. The structure is only helpful if the numbers make sense after accounting for both loans.

Cons and risks to understand

An 80-10-10 mortgage also has real drawbacks.

Two loans means more complexity

You are not just choosing one mortgage. You are choosing a first mortgage and a second mortgage. Each loan may have its own payment, terms, disclosures, closing costs, and servicing details.

The second mortgage may cost more

Second mortgages often carry different pricing than first mortgages. A higher rate or variable payment on the second lien can reduce or eliminate the savings from avoiding PMI.

Qualification can be tighter

The lender reviews the full combined payment. Strong credit, stable income, manageable debt, and documented assets may be especially important. Borrowers with limited reserves or higher debt-to-income ratios may find that a different loan program is a better fit.

Home equity risk is higher

Because the borrower is financing 90% of the purchase price, there is less equity cushion at closing than with 20% down. If home values soften or the borrower needs to sell sooner than planned, the smaller equity position can matter.

Who might consider an 80-10-10 mortgage?

An 80-10-10 mortgage may be worth comparing if you:

• Have 10% down but not 20%
• Want to avoid monthly PMI if the total cost is competitive
• Have strong credit and stable qualifying income
• Prefer to keep some cash in reserves after closing
• Are buying a higher-priced home and want to compare conventional, jumbo, and piggyback structures
• Understand the payment terms on both loans

It may be less attractive if the second mortgage has a high or adjustable payment, if you plan to sell quickly, or if a conventional loan with PMI has a lower total cost for your timeline.

Alternatives to an 80-10-10 mortgage

Before choosing a piggyback structure, compare it with other loan options.

Conventional loan with PMI

A conventional loan with less than 20% down may still be a practical option. PMI is not automatically a bad thing; it is a cost that should be compared against the cost of a second mortgage.

FHA loan

An FHA loan may be an option for borrowers who need more flexible credit or down payment guidelines. FHA loans include mortgage insurance costs, so the comparison should include both upfront and monthly costs.

VA loan

Eligible military borrowers may want to compare the 80-10-10 structure with a VA loan. VA loans are government-backed and have their own eligibility rules, funding fee considerations, and property requirements.

Down payment assistance programs

Some buyers may qualify for state or local assistance that changes the cash-needed conversation. New York buyers can review the New York State Mortgage Agency’s SONYMA programs and its Down Payment Assistance Loan. Florida buyers can review Florida Housing homebuyer programs.

Program availability, income limits, purchase price limits, occupancy rules, and repayment terms can vary, so assistance programs should be reviewed carefully before relying on them in a purchase plan.

Questions to ask before choosing an 80-10-10 mortgage

Before moving forward, ask your loan professional:

1. What is the estimated monthly payment for the first mortgage and second mortgage separately?
2. Is the second mortgage fixed or variable?
3. Are there any balloon payment, draw period, or repayment period details to understand?
4. What are the closing costs for one loan compared with two loans?
5. How does this compare with a conventional loan that includes PMI?
6. Can the second mortgage be paid off early, and are there any restrictions?
7. What happens if rates, home values, or your plans change?
8. Are there loan program alternatives that fit the same purchase price and down payment?

A good comparison should show the monthly payment, cash to close, short-term cost, and longer-term cost under realistic scenarios. Cross State Funding’s mortgage calculators can be a helpful starting point for estimating payments, but a full loan estimate is needed to compare actual loan terms.

Bottom line

An 80-10-10 mortgage is not just a trick to avoid PMI. It is a financing strategy that replaces mortgage insurance with a second loan. For some borrowers, that can be useful. For others, a single conventional mortgage with PMI, an FHA loan, a VA loan, a jumbo loan, or a down payment assistance program may be a better fit.

The right question is not simply, “Can I avoid PMI?” The better question is, “Which structure gives me the most workable payment, cash to close, flexibility, and long-term cost for my situation?” A side-by-side mortgage review can make that answer much clearer.