Two myths that keep locked-in homeowners stuck

When homeowners research “how to keep my mortgage rate when I move,” they hit two half-truths that end the search early. Both deserve a straight answer.

Myth 1: “The due-on-sale clause means my loan dies when I sell. End of story.”

The due-on-sale clause (standard in conventional mortgages since the Garn–St. Germain Act of 1982) says the lender may demand full repayment when the property transfers.

Read that again: may. It is the lender’s option, not a law of physics. The clause exists to protect the lender from unwanted transfers, it does not prevent the lender itself from authorizing a structure that preserves the loan’s value. That is exactly what a lender-executed discounted payoff (assumption + defeasance) is: the institution that holds the option chooses a better outcome for both sides.

What due-on-sale does rule out is the DIY version, quietly deeding the house while keeping the old loan (“subject-to” deals). Those trigger the clause, and internet forums are right to warn about them. The legitimate path runs through the lender, never around it.

Myth 2: “Can’t I just port my mortgage to the new house?”

In the U.K., Canada, and much of Europe, yes, porting is a standard product. In the United States, no. American 30-year fixed loans are built for securitization, not portability; no mainstream U.S. lender ports a mortgage to a new property. If you’ve read about porting, you were probably reading British or Canadian advice.

The U.S.-shaped equivalent isn’t moving the loan, it’s keeping the loan’s value: a discounted payoff executed by your lender, worth roughly 10% of the balance (typically $40,000–$75,000 on a 2020–21 loan). Real transactions have closed at U.S. credit unions, with documented family outcomes of $41,107 and $95,409. (Case studies.)

The pattern behind both myths

Both myths share one error: assuming the borrower’s only counterparty is the market. Your actual counterparty is your lender, the one party with both the authority and, increasingly, the incentive (yield, member retention, the next loan) to preserve the value with you. Which is why the useful question is never “what does the internet allow?” but: “Does my bank or credit union offer a discounted payoff or assumption + defeasance program for low-rate loans?”

Takara builds the DREAM program for banks and credit unions, B2B only. Homeowners: ask your own lender. Institutions: book a call.