The Case for Zero-Down Mortgages Rests on a Simple Finding: Low Down Payments Aren’t the Primary Reason for Defaults

Written by:

Steve Marcinuk

Date:

02 Sep 2026

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For decades, mortgage policy has treated down payments as a safeguard against default. The logic was intuitive: borrowers with more equity have more to lose, and those who go underwater will walk away. But a growing body of research suggests that assumption is wrong, and that the down payment requirement may be the single largest barrier keeping renters from becoming homeowners without actually protecting anyone from foreclosure.

Alexei Alexandrov, a researcher who works with nonprofits including the  Urban Institute’s Housing Finance Policy Center, has spent recent years assembling the data case for zero-down mortgages. His May paper argues that relaxing down payment requirements would expand homeownership access without meaningfully increasing default risk, a conclusion that follows directly from how researchers now understand why people lose their homes.

What Actually Causes Default

The older model of mortgage default assumed borrowers behaved strategically: if a home’s value dropped below the loan balance, borrowers would walk away. A later refinement – the “double trigger” theory – held that default required both negative equity and a life disruption like job loss or divorce.

But newer data from sources including JP Morgan Chase’s research institute and the Consumer Financial Protection Bureau has shifted the picture further. Life disruptions alone, job loss, death of a spouse, divorce, appear to dominate default outcomes nearly regardless of whether the borrower is underwater.

“It’s really a story about bad things happening to you,” Alexandrov says. “And that’s when people go into default almost regardless of what’s going on in terms of the house being underwater or not.”

Strategic default does exist, he notes, but only at extreme levels of negative equity, 20, 30, or 50 percent underwater, the kind of depreciation seen in a severe financial crisis or in geographically isolated markets hit by insurance cost spikes. A borrower who dips five percent below their purchase price is not, statistically, walking away just because their home is mildly underwater.

Why Down Payments May Not Be the Right Gate

If negative equity isn’t the primary default trigger, then the down payment, designed to create an equity cushion against that scenario, addresses a secondary risk while blocking access to homeownership for people who could otherwise sustain a mortgage.

Alexandrov frames the barriers to homeownership as three candidates: insufficient savings for a down payment, insufficient credit score, and insufficient income to cover monthly payments. No single dataset ranks all three cleanly, he acknowledges, but piecing together available data, the down payment appears to be the largest obstacle.

“If we can relax this one without really causing more defaults, why aren’t we doing this?” he says.

One finding that surprised him was the magnitude of credit score predictiveness. Even standard FICO or VantageScore, proved highly effective at predicting mortgage default, despite these models tuned to predict defaults on any loans, as opposed to mortgage defaults specifically. Alexandrov says this suggests creditworthiness screening already captures most of the risk that down payment requirements are meant to address.

The Supply-Side Objection

The most common pushback Alexandrov encounters is that zero-down mortgages are a demand-side intervention in a market constrained by supply. He concedes the point directly: expensive cities face zoning constraints that limit density, and in less expensive areas, construction costs alone push new single-family homes above $300,000.

But he argues the intervention doesn’t create new housing demand in the aggregate; it shifts existing demand from rental to ownership. People who have been renting for years already occupy housing units. A zero-down mortgage moves them from renting to buying without adding a new household to the market. “We’re going to create extra demand for housing units for sale as opposed to for rent,” he says.

Alexandrov extends this logic to the private equity single-family rental debate. Institutional landlords are profitable, he argues, because their tenants earn enough to cover monthly housing costs but cannot clear the down payment threshold. Remove that barrier, and the economics of buying single-family homes for rental purposes shift. “The whole private equity single-family home situation was always a symptom as opposed to a cause,” he says.

On the supply side, Alexandrov points to manufactured housing as an underused solution for lower-cost markets. A new manufactured home can be purchased for around $120,000 and placed on a $25,000 parcel, producing a starter home near $150,000 to $160,000. But zoning barriers and consumer stigma still limit where these homes can be placed, even in areas where single-family construction is otherwise permitted.

What Comes Next

The ideal vehicle, in Alexandrov’s view, would be an FHA product, the agency has historically served first-time, low-down-payment buyers. But that requires congressional action, which he describes as difficult in the current environment despite bipartisan interest in affordability.

The more realistic path runs through private mortgage insurers. “At some point one of the private mortgage insurers can do exactly the same calculation as we did, and probably they will do it better because they have much more data,” he says. Once a PMI company backs zero-down loans, Fannie Mae or Freddie Mac can follow without congressional approval.

A Separate Problem: Mortgage Shopping

Alexandrov points to a related issue he also considers urgent. In surveys of recent borrowers, roughly two-thirds believed every lender would offer them the same rate. That belief eliminates any incentive to compare offers.

“If you believe that every lender is going to offer you the same rate, you’re not going to shop around,” he says. But lenders do offer different rates, and borrowers can easily find rates half a percentage point lower by contacting additional lenders, which on a $400,000 home translates to about $100 per month over the life of the loan.

Alexandrov argues federal agencies could address this by redesigning mortgage disclosures. Rather than presenting five pages of mortgage math, he says, the front page should tell borrowers plainly whether their offer is competitive relative to the broader market. Borrowers who want premium service from their lender can seek it through private mortgages, but first-time buyers using government-backed products should not absorb that cost by default.

About the Expert: Alexei Alexandrov is a researcher working with nonprofits like the Urban Institute on housing and consumer finance issues.

This article is based on information provided by the expert source cited above. It is intended for general informational purposes only and does not constitute legal, financial, or real estate advice. Readers should conduct their own research and consult qualified professionals before making any real estate or financial decisions.