A second mortgage originated with the first mortgage to help finance the same home purchase.
A piggyback loan is a second mortgage originated at the same time as the first mortgage to help finance the same home purchase. The second loan may be a closed-end home equity loan or a home equity line of credit.
The buyer combines the first mortgage, piggyback second mortgage, and cash down payment to cover the purchase price and eligible transaction costs.
Piggyback financing changes the structure, not the total amount borrowed. A buyer might keep the first mortgage at 80% of the purchase price and borrow another 10% through a second lien. The first-loan LTV is 80%, but the Combined Loan-to-Value Ratio (CLTV) is 90% before other included liens.
Borrowers sometimes consider this structure as an alternative to one larger conventional mortgage with Private Mortgage Insurance (PMI). Keeping the first mortgage at or below a lender’s mortgage-insurance threshold may avoid PMI on that loan, but the second mortgage has its own interest rate, payment, fees, and risks. Avoiding one cost does not prove the two-loan structure is cheaper.
Piggyback financing is planned during preapproval and product comparison. Both loans must be coordinated for the same closing, and the first-mortgage lender must account for the simultaneous second-lien payment when evaluating repayment ability.
The lenders or lending departments also coordinate:
The first mortgage records in senior position, and the piggyback loan normally becomes a Junior Lien.
| Structure | First mortgage | Second mortgage | Down payment | Combined mortgage debt |
|---|---|---|---|---|
| 80-10-10 | 80% | 10% | 10% | 90% |
| 80-15-5 | 80% | 15% | 5% | 95% |
| Other lender-approved split | Varies | Varies | Varies | First and second liens combined |
These labels describe proportions, not loan programs available from every lender. The second lien can have a fixed or variable rate and may amortize differently from the first.
Nora buys a $600,000 home using:
$480,000 first mortgage$60,000 piggyback second mortgage$60,000 down paymentThe first-mortgage LTV is 80%. Combined mortgage debt is $540,000, so CLTV is 90%. Nora must qualify with the payments and terms of both loans, not only the $480,000 first mortgage.
If the second loan is a variable-rate HELOC, its payment can change independently of the fixed first mortgage. If it is a closed-end home equity loan, it may have a fixed scheduled payment but no reusable line capacity.
| Comparison item | Single mortgage with PMI | Piggyback structure |
|---|---|---|
| Number of loans | One | Two |
| Mortgage insurance | May apply under the loan terms | May be avoided on an 80% first lien |
| Interest rates | One mortgage rate | First- and second-lien rates may differ |
| Monthly obligations | Mortgage payment plus applicable PMI | First payment plus second payment |
| Closing costs | One primary loan package | Costs may apply to both liens |
| Later refinance | One lien to replace or pay off | Second lien may need payoff or subordination |
Compare the annual percentage rate where applicable, monthly payment, cash to close, expected holding period, tax treatment with a qualified adviser, and likely payoff path. A higher-rate second lien can cost more than the PMI it replaces.
Two liens must be handled when the property is sold or the debt is refinanced. Sale proceeds pay the first lien before the junior lien. If property value declines, there may be less equity available to satisfy both.
To refinance only the first mortgage while keeping the piggyback loan, the second-lien holder may need to approve Subordination. Otherwise, the second loan may need to be paid off or included in a larger refinance, subject to eligibility.
A private expectation that the second loan will be easy to refinance later is not a substitute for qualifying under future rates, values, and credit standards.
Second Mortgage is any junior mortgage behind a senior lien. A piggyback loan is specifically originated with the first mortgage as part of the purchase financing.
Home Equity Line of Credit (HELOC) is a revolving product. It can serve as the piggyback loan, but a piggyback can also be a closed-end second mortgage.
Community Second Mortgage is an approved assistance-oriented subordinate structure with its own program rules. Not every piggyback is a community second.
PMI protects the first-mortgage lender under the insurance terms. A piggyback instead splits part of the purchase financing into a separate lien.
80% first mortgage mean the borrower financed only 80% of the purchase?
Not in a piggyback structure. The second mortgage also counts, so combined mortgage debt can be 90%, 95%, or another amount.