Portable Mortgages: Can You Take Your Low Interest Rate with You?

The Golden Handcuffs Dilemma

Status as of September 2026: Fannie Mae and Freddie Mac loans are generally not portable. FHFA has said it is evaluating the idea, and a bill to require it (the MOVE Act) was introduced in August 2026, but portable conventional mortgages are not yet available. Roughly half of outstanding U.S. mortgages still carried a rate of 4% or less in early 2026, according to Realtor.com's analysis of FHFA National Mortgage Database data. While this is fantastic for homeowners' monthly budgets, it has created a major inventory shortage. Homeowners who want to upgrade or downsize are reluctant to sell because buying a new home can mean trading a rate near 3% for a current market rate several points higher. This gridlock has sparked a nationwide discussion on a potential solution: portable mortgages.

What Is a Portable Mortgage?

A portable mortgage allows a homeowner to transfer ("port") the balance, interest rate, and terms of their existing home loan from their current property to a new one. For example, if you owe $250,000 at 3.25% on your current home, porting would let you keep that exact rate and loan balance on your next purchase, rather than taking out an entirely new mortgage at current market rates.

How the Porting Process Works

In countries where porting is common (such as the UK and Canada), the process involves two main scenarios: 1. Straight Porting: The new home costs the same or less than the outstanding loan balance. You simply transfer the loan terms over. 2. Porting with Top-up: The new home costs more. You keep your original $250,000 balance at 3.25%, and borrow the additional amount needed at current market rates, blending the two into a composite payment.

Are Portable Mortgages Allowed in the US?

In the U.S., standard conventional mortgages (those sold to Fannie Mae and Freddie Mac) are generally not portable. Policymakers have discussed changing that. In November 2025, FHFA Director Bill Pulte said Fannie Mae and Freddie Mac were evaluating assumable or portable mortgages "in a safe and sound manner," and in August 2026 Rep. Tom Kean Jr. introduced the MOVE Act, which would direct them to buy portable mortgages. The primary barrier is that US mortgages are packaged into Mortgage-Backed Securities (MBS) sold to global investors, making structural changes to active loans highly complex.

The Closest Alternatives Available Today

While porting is not widely available yet, you have other options to get a lower effective rate on your next home: • Assumable Mortgages: Some FHA, VA, and USDA loans are assumable, meaning a buyer can take over the seller's active low-rate mortgage. This is one of the most underutilized tools in today's market. • Seller Financing: The seller acts as the lender, offering a below-market rate to close the sale faster. • HELOC Blending: Keeping your low first mortgage and using a second loan or HELOC for renovations rather than moving at all.

What to Watch For

Portable mortgages remain a policy proposal, not an available product, so plan around the loan options that exist today. Separately, HUD opened a public comment period in May 2026 (closed June 29, 2026) on FHA minimum property requirements; that review is about property standards for FHA loans, not about porting. If portable mortgages were adopted, they could free up locked inventory and make moving more affordable for many homeowners. In the meantime, use our Refinance Break-Even Calculator and Comparison Calculator to model what a blended or market-rate loan would actually cost you over time.

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