What it is
A subject-to purchase separates ownership from the debt. Title transfers to the buyer, but the existing mortgage stays in place and stays in the seller’s name — the buyer simply takes over making the payments. Nothing is refinanced and nothing is formally assumed, which is what distinguishes it from a loan assumption where the lender approves a new borrower. The appeal is arithmetic: a loan written when rates were far lower carries a payment no new financing can match, and that payment is what the buyer inherits.
How the structure works
At closing the deed transfers and the loan does not. The buyer typically pays the seller some amount for their equity, then begins making the existing payment. Because the seller remains legally liable on the note, the arrangement depends entirely on the buyer performing — a missed payment damages the seller’s credit, not the buyer’s. Careful practitioners address this with documentation and mechanics that make performance verifiable, and by ensuring taxes and insurance continue to be paid, since a lapse in either can trigger action from the lender independently.
How investors actually use it
It is a tool for a specific situation: a seller who needs out more than they need proceeds, paired with a below-market loan worth preserving. That describes relocations, inherited property, and owners facing payments they can no longer carry. For the investor, the acquisition consumes little cash, requires no qualification, and produces a cost of debt that cannot be bought at today’s rates — which can make a property cash-flow that would not pencil on new financing. Volume is naturally limited, because the circumstances that make it work are uncommon. Insurance is the other practical hurdle, since the policy has to reflect the new ownership without disturbing the underlying loan — a detail worth solving before closing rather than after.
The common mistake
Underestimating the due-on-sale clause. Nearly every mortgage lets the lender call the balance due upon transfer of title, and while lenders often do not act while payments arrive on time, the risk is real and it grows when rates rise, because calling a below-market loan becomes profitable. A buyer with no plan to refinance if the loan is called is exposed. Subject-to raises real legal, insurance, and disclosure questions that vary by state — have a qualified attorney structure any such purchase.
Related terms
- Seller financing — An arrangement where the property seller acts as the bank, letting the buyer make payments directly to them instead of getting a traditional mortgage.
- Wraparound mortgage — A form of seller financing where the seller keeps their existing loan and extends the buyer a new, larger loan that 'wraps around' it.
- Cash-out refinance — Replacing an existing mortgage with a larger new loan and taking the difference in cash, tapping built-up equity without selling.
- Seasoning — The minimum time you must own a property — or hold a mortgage — before a lender will let you refinance at its new appraised value or pull cash out.