Yes, when executed by the borrower's own lender: it is a loan assumption plus defeasance carried out on the lender's own rails and documents. Real transactions have closed at U.S. credit unions, including documented family outcomes of $41,107 and $95,409. If anyone other than your own lender is running the transaction, walk away.

“Too good to be true?” A skeptic’s guide to the discounted payoff
If someone told you that you could sell your house and keep $40,000–$75,000 of your mortgage’s value, skepticism is the correct first response. Anything touching your home and your loan should survive hard questions. Here are the hard questions, answered.
Where does the money actually come from?
Not from magic, from a mispricing you’re currently on the wrong side of. Your 3% loan is worth roughly 80 cents on the dollar to the market, but a traditional payoff makes you repay 100. That 20-point gap is real value that today goes entirely to the note holder as a windfall. A discounted payoff splits it instead: you keep a substantial share (typically ~10% of balance), and your lender improves its own position.
Why would my lender ever agree?
Because the lender wins too, that’s the entire design. Through defeasance, the loan’s collateral is replaced with high-quality securities, so the loan’s economics continue; the institution redeploys at today’s yields, sheds the risk of a decades-long below-market asset, and, for a member-owned credit union, keeps the member, the deposits, and the next mortgage instead of losing everything at payoff. No loan sale. No haircut. No new infrastructure.
Who executes it?
Only your lender. That’s your strongest protection and the test of legitimacy: the transaction is a loan assumption + defeasance executed by the institution that holds your loan, on its own rails, with its own documents. If anyone other than your own lender is asking you for money, documents, or the deed, walk away. (Takara, for the record, is the B2B company that builds this program for lenders; we never transact with borrowers, which is exactly why you should verify everything through your own institution.)
Has it actually happened?
Yes, documented, at U.S. credit unions: the McGovern family kept $41,107 (Great Lakes Credit Union, Illinois), and the Cameron family kept $95,409. Read the case studies, with real numbers. The transaction structure is patent pending, and the program’s advisory voices include a former Chair of the NCUA, the federal regulator of credit unions.
The questions to ask before signing anything
Is this executed entirely by you, my lender, on your own documents? What is my exact payoff figure, and how does it compare to my current balance? What are the eligibility requirements and fees? What are the tax implications of a below-balance payoff in my situation?, discuss with your tax advisor before closing; treatment depends on your circumstances. Can I see this in writing, with time to review it with my own advisor?
A legitimate program welcomes every one of these questions. That’s how you tell it from the things that are too good to be true.
Takara builds the DREAM discounted-payoff program for banks and credit unions, B2B only. Homeowners: ask your own bank or credit union. Financial institutions: book a call.