What is a piggyback loan?

A piggyback loan is a second mortgage taken out simultaneously with the primary mortgage to help cover the purchase price and reduce or eliminate the need for private mortgage insurance (PMI). The most common structure is the 80-10-10: the first mortgage covers 80% of the home price, the second loan (piggyback) covers 10%, and the buyer provides a 10% down payment. This avoids the PMI requirement triggered when a first mortgage exceeds 80% loan-to-value (LTV). The second loan is typically a home equity loan or HELOC.

How does an 80-10-10 mortgage work?

With an 80-10-10, you take out two loans at the same time. Loan 1 is a conventional first mortgage for 80% of the purchase price. Loan 2 is a second mortgage (usually a HELOC or home equity loan) for 10% of the purchase price. You pay 10% from your savings as a down payment. This structure keeps your first mortgage LTV at exactly 80%, eliminating the PMI requirement. You then make two separate monthly payments — one to the first mortgage servicer and one to the second mortgage lender.

Does a piggyback loan avoid PMI?

Yes — an 80-10-10 structure avoids conventional PMI because the first mortgage does not exceed 80% LTV. PMI is required when a conventional loan LTV exceeds 80%. However, the second mortgage carries its own costs — a higher interest rate than the first mortgage and separate closing costs. Whether the total cost of a piggyback loan is less than PMI depends on your specific loan amounts, rates, and how long you carry PMI if you chose a single loan instead.

What are the downsides of a piggyback loan?

The main downsides of piggyback loans are: two separate loan payments to manage; the second mortgage typically carries a higher interest rate than the first (often prime rate + margin, especially for HELOCs); two sets of closing costs; more complex underwriting — you must qualify for both loans simultaneously; HELOCs have variable rates, so the second payment can change; and refinancing in the future requires coordinating both loans (the second mortgage lender must subordinate or be paid off). If home values fall, you have less equity cushion than a single-loan borrower.

What other piggyback loan structures exist besides 80-10-10?

The 80-10-10 is the most common piggyback structure, but others exist depending on available down payment: 80-15-5 (5% down, 15% second mortgage, 80% first), and 80-20 (0% down, 20% second mortgage) — though the 80-20 is essentially eliminated in the post-2008 lending environment. The 75-15-10 structure is used for jumbo loans to keep the first mortgage below the conforming loan limit, allowing a lower interest rate on the larger first mortgage while financing the gap with a second loan.

Piggyback Loan (80-10-10 Mortgage) Explained — 2026

Q: Is a piggyback loan better than PMI?

It depends on the size of the loans, the PMI rate, and how long you expect to carry PMI. PMI typically costs 0.5–1.5% of the loan amount per year and can be removed once you reach 20% equity. If you would reach 20% equity quickly — within 2–4 years through appreciation or extra payments — PMI may be cheaper than carrying a higher-rate second mortgage for that same period. If you expect to stay below 20% equity for 5+ years, a piggyback loan often saves money. A break-even analysis with your specific numbers is essential.

A piggyback loan uses a second mortgage to reduce your down payment while avoiding private mortgage insurance (PMI). The most common structure — the 80-10-10 — combines an 80% first mortgage, a 10% second mortgage, and a 10% down payment. The first loan stays at exactly 80% LTV, eliminating the PMI threshold entirely.

How a Piggyback Loan Works Step by Step

Home purchase price: $500,000
Target: avoid PMI with 10% down

Loan Component	Amount	Notes
First mortgage (80%)	$400,000	Conventional 30-year loan
Second mortgage / piggyback (10%)	$50,000	HELOC or home equity loan
Down payment (10%)	$50,000	From savings
Total	$500,000	No PMI required

At closing, both loans are originated simultaneously. The first mortgage is recorded in first lien position; the second mortgage is recorded in second lien position.

Piggyback Loan vs. Single Loan with PMI

The core question: is carrying a second mortgage cheaper than paying PMI on a 90% LTV single loan?

Scenario: $500,000 home, $50,000 down (10%)

	80-10-10 Piggyback	90% Single Loan + PMI
First mortgage	$400,000 at 6.8%	$450,000 at 6.8%
Second mortgage	$50,000 at 9.25% (HELOC prime+1)	None
PMI	None	~$225/month (0.6% × $450k ÷ 12)
First mortgage payment	$2,611/month	$2,937/month
Second mortgage payment	~$410/month	None
Total monthly cost	$3,021	$3,162
PMI savings (monthly)	—	—
Piggyback monthly savings	~$141/month	—

However, if you reach 20% equity within 3 years through appreciation or extra payments, PMI removal eliminates that $225/month — and the piggyback carries an ongoing $410/month payment for years. The longer you hold the piggyback second mortgage, the more the math shifts.

Break-even rule of thumb: If you expect to hit 80% LTV (cancel PMI) within 2–3 years, a single loan with PMI may be cheaper. If 5+ years are likely, the piggyback loan typically wins.

Second Mortgage Options for the Piggyback

Type	Rate Type	Rate Estimate	Best For
HELOC (10-year draw period)	Variable (prime + margin)	8.5–9.5% in 2026	Flexibility; can pay down faster
Home equity loan	Fixed	8.0–9.0%	Predictable fixed payment
15-year fixed second	Fixed	7.5–8.5%	Structured payoff

HELOCs are most commonly used for piggyback loans because they offer flexibility — you can pay down the line of credit faster when cash is available, reducing your ongoing cost. However, the variable rate is a risk if prime rate rises.

Other Piggyback Structures

Structure	First Mortgage	Second Mortgage	Down Payment
80-10-10	80%	10%	10%
80-15-5	80%	15%	5%
75-15-10 (jumbo)	75%	15%	10%
80-5-15	80%	5%	15%

75-15-10 jumbo structure: Useful when the home price exceeds the conforming loan limit ($766,550 in most areas in 2026). Keeping the first mortgage at 75% loan-to-value (below the jumbo threshold) and using a 15% second mortgage lets borrowers use a lower-rate conforming first mortgage instead of a higher-rate jumbo loan.

Qualifying for a Piggyback Loan

You must qualify for both loans simultaneously. Underwriting requirements:

Requirement	First Mortgage	Second Mortgage
Credit score	620+ conventional	660–700+ typical
DTI ratio	Max 43–45% combined	Combined DTI used
Income documentation	Full documentation	Same
Reserves	2 months PITI	Often 2–3 additional months

Combined DTI: Lenders calculate your debt-to-income ratio using the combined payments of both loans plus all other debts. Your housing expenses alone should be under 28–31% of gross income, and all debts combined under 43–45%.

Pros and Cons

Pros	Cons
Eliminates PMI entirely	Two loan payments to manage
May save money vs. PMI long-term	Second mortgage carries higher interest rate
Can be paid off faster independently	Two sets of closing costs
HELOC line of credit is reusable	Variable rate risk on HELOC
Useful for jumbo loan avoidance	Refinancing requires coordinating both liens

How to Pay Off the Piggyback Loan Faster

Many borrowers prioritize paying off the second mortgage first, since it carries the higher interest rate. Strategies:

Direct any extra monthly payments to the HELOC/second mortgage principal
Apply bonuses or tax refunds entirely to the second mortgage
Refinance the second mortgage separately once you have enough equity

Once the second mortgage is paid off, you are left with only the first mortgage — and your effective LTV may be below 80%, at which point you can request PMI removal if your first mortgage no longer requires it.

Written by WealthVieu

WealthVieu researches and writes data-driven personal finance guides using primary sources including the IRS, Bureau of Labor Statistics, Federal Reserve, and Census Bureau.

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