A family loan to pay off a mortgage works by having a relative lend you the remaining balance so you pay the bank in full, then you repay your relative instead, usually at a lower rate than any bank would offer. On a $320,000 balance with 24 years left, moving from a 7.28% bank rate to the October 2026 long-term Applicable Federal Rate of 5.22% saves roughly $403 a month and about $116,000 in interest over the life of the loan. The catch is that you do not inherit the bank's mortgage. You pay it off and start over with a private debt that has none of a bank's built-in protections, unless you set it up correctly.
This is not the same question as borrowing from family for a down payment, or using a HELOC to fund someone else's loan. It sits in the same family of decisions as using a family loan to pay off student loans or credit card debt: trading a bank's rate for a relative's, on terms you control. A mortgage just has more moving parts than either of those, starting with a lien that already exists and has to be unwound correctly. For the full mechanics of setting the rate itself, see our guide on what interest rate to charge on a family loan.
What "paying off your mortgage with a family loan" really means
You cannot transfer your mortgage to your parents, and they cannot simply take over your payments. Residential mortgages are not assumable except in rare cases involving FHA, VA, or USDA loans with lender approval. What actually happens is a payoff and a new, separate loan:
- Your relative wires or transfers the payoff amount, confirmed against a payoff statement from your current loan servicer (not your last billing statement, which rarely matches the true payoff figure).
- The servicer applies the funds, closes the loan, and records a satisfaction of mortgage (sometimes called a release or discharge) with the county.
- You and your relative sign a new promissory note for that same amount, on new terms you both agree to.
The bank is now out of the picture entirely. What you owe, and to whom, is defined solely by the document you and your relative sign next.
Why families consider this trade
The gap between bank mortgage rates and the IRS's Applicable Federal Rate (AFR) is the whole case for doing this. As of October 1, 2026, Freddie Mac's Primary Mortgage Market Survey put the average 30-year fixed rate at 7.28%. The IRS's long-term AFR for loans over nine years is 5.22% for October 2026 (4.61% for mid-term loans of three to nine years, 4.25% for short-term loans under three years). The AFR is not a suggestion. It is the minimum rate a family loan can charge without the IRS treating the "missing" interest as a taxable gift from lender to borrower.
A concrete example: Maria owes $320,000 on her home with 24 years left on a 7.28% mortgage. Her monthly payment is about $2,354, and she would pay roughly $357,850 in interest if she rode the loan to term. Her father lends her $320,000 instead, at the long-term AFR of 5.22%, amortized over the same 24 years. Her new payment drops to about $1,951 a month, and total interest falls to about $241,860. That is $403 less every month and about $116,000 saved over the full term, money that stays inside the family instead of going to a bank's shareholders.
Run your own numbers with the family loan calculator before you commit to a structure, and check the current month's AFR since it changes every month and the rate you lock in is the rate that applies for the life of a fixed-rate family loan.
The deduction you can lose if you skip one step
Mortgage interest is deductible under IRC Section 163(h) only when the debt is "qualified residence indebtedness," which the IRS defines in Publication 936 as debt secured by a recorded lien on the home. A handshake, or even a signed promissory note that never gets filed with the county, does not qualify. If your relative does not record a deed of trust or mortgage against the property, you lose the deduction entirely, on top of handing your relative an unsecured position if you ever stop paying.
This is the single most skipped step in family mortgage payoffs, and it is avoidable for a few hundred dollars in recording and title fees. Our guide to the mortgage interest deduction on family loans walks through exactly what the lien needs to say and how to get it recorded correctly. If you are unsure whether your situation needs a notarized, recorded instrument versus a simpler note, this breakdown of when a family loan needs notarization covers the three situations where it genuinely matters.
Does this trigger a due-on-sale problem?
No, and this is a common point of confusion. A due-on-sale clause is triggered by a transfer of the property's title, not by paying off the debt secured against it. Since you are paying your own mortgage in full and keeping title in your own name, there is nothing to accelerate. The due-on-sale question only becomes relevant in a different scenario entirely, one where a parent's name goes on the deed, such as certain family opportunity mortgage arrangements.
What your relative is actually risking
Once the bank is paid off, your relative is not a bank. They cannot foreclose through a streamlined judicial or non-judicial process the way a mortgage servicer can, even if they record a lien; enforcing a private note usually means a civil lawsuit, which is slower, costlier, and far more likely to permanently damage the relationship than a missed bank payment ever would.
Before they transfer the money, your relative should ask three questions a bank underwriter would ask and a family member often will not:
- Can they afford to be illiquid for the life of the loan? $320,000 tied up in a note to one adult child is $320,000 not available for their own retirement, long-term care, or an emergency.
- What happens if they die before the loan is repaid? The outstanding balance becomes an asset of their estate, which can complicate things for other heirs unless the estate plan accounts for it explicitly. Our guide on what happens to a family loan when the lender dies covers the three paths executors typically use.
- Is life insurance worth adding? A policy that names the borrower's estate or a trust as beneficiary, sized to the loan balance, can protect the rest of the family if the borrower dies before the note is paid off. We cover the mechanics in our guide to using life insurance to back a family loan.
A documentation checklist before you touch the bank
- Get a written payoff statement from the current servicer, good through a specific date (payoff amounts accrue daily interest).
- Draft a promissory note at or above the correct AFR tier for your loan's term, with a fixed amortization schedule, not an open-ended "pay me back when you can" arrangement.
- Record a deed of trust or mortgage against the property to preserve the interest deduction and give your relative a secured position.
- Set up automatic payments and a shared ledger from day one. A loan that starts precise stays precise; one that starts informal usually stays informal until someone is upset about it. Create a free loan agreement and pull the full amortization schedule so both sides can see exactly what is owed, month by month, for the life of the loan.
- Decide in writing what happens on early payoff, hardship, or sale of the home before any of those things happen, not after.
When this doesn't make sense
The math only works in your favor when the rate gap is real and the remaining term is long enough to matter. If you have five years left on your mortgage at 4% from a 2021 refinance, there is no gap to close, and moving the debt to a relative only adds risk for no savings. If your relative cannot comfortably part with the funds for the full term, or if your family history includes money arguments that never fully resolved, the interest savings are rarely worth what a strained relationship costs. A family loan should replace a bank, not replace the clarity a bank forces on both of you; if you cannot replicate that clarity on paper, start tracking the loan properly before the first payment is due, or consider whether this is a case where a bank, imperfect as it is, is still the safer answer.
