Piggyback Loan vs PMI Calculator
Compare a piggyback second mortgage against one larger loan with PMI, see your first-lien LTV and CLTV, and estimate which route looks cheaper on a real monthly basis.
Piggyback loan vs PMI calculator
Enter your purchase details, rates, and planning assumptions. The calculator compares a piggyback setup against one larger loan with PMI using the same down payment.
Detailed comparison
| Line item | Piggyback route | Single loan + PMI |
|---|---|---|
| Down payment | $0 | $0 |
| First mortgage | $0 | $0 |
| Second loan | $0 | — |
| Monthly principal + interest | $0 | $0 |
| Monthly PMI | — | $0 |
| Taxes + insurance + HOA | $0 | $0 |
| Upfront extra second-loan costs | $0 | — |
| Financing drag over comparison window | $0 | $0 |
Planning note: this tool treats the second lien like a fixed-payment estimate. If your lender uses a HELOC with a variable rate or an interest-only draw period, your real payment can be different.
On this page
Quick context
A piggyback loan is a second mortgage or HELOC taken at the same time as your main mortgage. People often use it to keep the first mortgage at or under 80% LTV and avoid PMI. That does not automatically mean it is cheaper.
This calculator is strongest as a planning tool. Use your actual lender quotes before making a final call.
What this calculator compares
This page compares two real-world paths using the same home price and down payment:
- Piggyback route: a first mortgage plus a second loan.
- Single-loan route: one larger first mortgage with monthly PMI.
That helps answer the question normal buyers actually have: “If I do a second loan to avoid PMI, does that really save me money?”
Use your existing cluster tools first when you need them:
How Much House Can I Afford?,
Mortgage Affordability Calculator,
Cash to Close Calculator,
Down Payment Calculator,
PMI Calculator,
LTV Calculator,
CLTV Calculator, and
80/10/10 Piggyback Mortgage Calculator.
When a piggyback loan may win
A piggyback route may look stronger when:
- the second loan rate is not wildly higher than the first,
- PMI pricing is expensive for your credit/down-payment profile,
- you want to keep the first mortgage at or below 80% LTV,
- you can handle the second payment without stressing your monthly budget, and
- you understand the second lien terms, especially if it is a HELOC.
This is exactly why it helps to compare the monthly payment and the multi-year financing drag, not just whether PMI shows up on the statement.
When PMI may be the simpler choice
PMI may be the better answer when:
- the second loan rate is high,
- the second lien adds meaningful upfront costs,
- you want one simple mortgage instead of two debts,
- you expect PMI to fall off relatively soon, or
- the second lien structure is adjustable and makes your budget less predictable.
If your single-loan route is cleaner and the payment difference is small, simpler is often better.
And if you already have PMI, read How to Remove PMI From Your Mortgage so you know what the off-ramp actually looks like.
Real example
Say you are buying a $400,000 home with 10% down.
- With one loan, you would borrow $360,000 and likely pay PMI because the LTV is above 80%.
- With a piggyback route, you might structure it as 80% first mortgage + 10% second loan + 10% down.
That may remove PMI on the first mortgage, but it replaces it with a second lien that often has a higher rate. The right move depends on the payment math, the quote on the second lien, and how long you expect to keep the loan setup.
Watch inside the post
Piggyback Mortgage Explained — useful if you want a simple visual of how the structure works before comparing payments.
80/10/10 Strategy Explained — useful for understanding when a piggyback setup may look better than a larger loan with PMI.
FAQ
Is a piggyback loan always cheaper than PMI?
No. Sometimes it is, sometimes it is not. The second loan can carry a higher rate, add another closing-cost bucket, and increase complexity.
What does “monthly difference” mean in this tool?
It compares the estimated full monthly housing payment under both routes using the same taxes, insurance, and HOA assumptions. A positive number means the piggyback route looks cheaper in this estimate.
How does the tool estimate PMI removal?
It estimates when the single-loan balance reaches 80% of the original home price based on the amortization schedule you entered. Real servicing rules and loan conditions still matter, so treat it as a planning estimate.
Does this tool work for FHA loans?
Not really. This page is built for conventional-loan style PMI comparisons. FHA mortgage insurance follows different rules.
What if the second loan is a HELOC with variable payments?
Then this tool is a planning estimate only. Use your actual HELOC quote, margin, draw-period terms, and repayment terms before deciding.
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How to Use This Calculator
Enter your home price, first mortgage amount, and second loan (HELOC or second mortgage). The calculator compares monthly PMI cost vs. carrying two loans to determine which structure costs less over time.
What to Do With Your Result
If the piggyback option saves money month-to-month, run the full 5-year total cost comparison — second mortgage interest is often deductible while PMI is not. Get quotes from two lenders on both structures and let them compete. The best option depends on your credit score, the second mortgage rate you qualify for, and how long you plan to stay in the home.
Disclaimer: This calculator is for educational purposes only and does not constitute financial or mortgage advice. Consult a licensed mortgage professional for figures specific to your situation.
Sources
- Consumer Financial Protection Bureau (CFPB)
- FDIC — Consumer Resource Center
- Federal Trade Commission — Money
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