The 80/20 piggyback is one of those structures that sounds clever — and was, until the housing crisis rewrote the rules. It's worth understanding both how it works and where it actually stands today.
What an 80/20 piggyback is
An 80/20 piggyback means financing a home with two loans taken out together: a first mortgage for 80% of the price, and a second loan — the "piggyback" — for the rest. In the classic 80/20, the second covers the full remaining 20%, adding up to 100% financing with no down payment. A common cousin is the 80/10/10: 80% first mortgage, 10% second, and 10% down.
Avoiding PMI and jumbo thresholds
There were two reasons to do this:
- Dodging PMI. A conventional loan with less than 20% down requires private mortgage insurance. By keeping the first mortgage at exactly 80% and letting a second loan cover the gap, you avoid PMI on that first mortgage.
- Staying under the jumbo line. Splitting the financing can keep your first mortgage at or below the conforming loan limit — avoiding the pricier terms of a jumbo loan — while a second loan handles the amount above it.
First and second lien structure
The first mortgage (80%) is the primary lien. The piggyback sits behind it as a second lien — often a fixed second or a HELOC. Because the second is subordinate and riskier for the lender, it carries a higher rate. You make two payments, on two loans, with two sets of terms.
Pros and cons
Pros: avoid PMI, sidestep jumbo pricing, and (in the 80/20) buy with little or nothing down. Cons: the second loan's higher rate, two payments to manage, a second that's often variable if it's a HELOC — and therefore exposed to rate increases — added complexity, and a tougher refinance later, since both liens have to cooperate.
Availability today
This is the important part. The true 80/20 — 100% financing with no money down — was common before the 2008 housing crisis and largely disappeared afterward. What survives today is mostly the 80/10/10 structure, where you still put 10% down; some lenders offer it to help borrowers avoid PMI or stay under the jumbo limit. So if you're picturing zero-down piggyback financing, know that it's mostly a relic — the modern version expects a down payment.
The takeaway
An 80/20 piggyback splits a purchase across two liens to avoid PMI or a jumbo loan. The no-money-down version is largely gone since 2008; the 80/10/10 lives on for borrowers who want to dodge PMI with 10% down. If a lender offers one, weigh the higher second-lien rate and the two-payment complexity against what you're actually saving.
Availability and terms vary by lender, and the zero-down version is rare today. Confirm what's actually offered before counting on it.