Two investors look at the same tired three-bedroom with a motivated seller. One offers to take over the payments. The other offers to lease it with a locked-in price and buy it in three years. Both are creative finance. Both avoid a new bank loan. And only one of them is going to work on this particular seller.
The difference between a lease option and a subject-to isn't a preference — it's a structural fact about who ends up owning the house. Get that wrong and you either scare off a seller who was never going to deed you their property, or you tie up a house you should have taken title to months ago.
The one difference that matters
Subject-to moves title. A lease option doesn't.
In a subject-to deal, the seller deeds you the property and their existing mortgage stays exactly where it is — in their name, at their rate, on their credit. You own the house. You make the payments. The loan is not assumed, not refinanced, not renegotiated. It just keeps running while the deed sits in your name.
In a lease option, you sign two separate agreements: a lease that gives you possession, and an option that gives you the right — never the obligation — to buy at a price you set today. The seller keeps the deed. The seller keeps the loan. You control the property without owning it.
Everything else about these two structures flows from that. Insurance, tax treatment, what happens if the market drops, what you can do with the property, how you exit — all downstream of whether title moved.
Which seller fits which structure
Sellers don't come to you asking for a structure. They come with a situation, and the structure is your read on it.
Subject-to fits the seller who needs out
- Little or no equity. If the loan balance is close to market value, there's no cash to give them anyway. Debt relief is the offer.
- Behind on payments or heading there. A seller staring at default cares more about the mortgage going current than about a check at closing.
- Has to move now. Job relocation, divorce, an inherited house two states away. Speed is the product.
- Already emotionally gone. They've mentally left the house. Signing the deed isn't a wrench.
The tell is when a seller describes the property as a burden rather than an asset. Burden sellers deed. Asset sellers don't.
A lease option fits the seller who isn't ready
- Meaningful equity they don't want to discount. They'd rather wait for their number than take less today.
- Wants income, not a sale. A steady monthly payment on a house they're tired of managing solves their actual problem.
- The house won't appraise or won't finance. Deferred maintenance, unpermitted work, a condo project with lending issues.
- Attached to the property. The family home, the first rental, the one they swore they'd never sell. Some sellers will lease to you for years and never sign a deed.
If a seller flinches at the word "deed" but relaxes when you say "lease," you have your answer. Don't spend three more calls trying to convert them.
What each structure costs you
Neither of these is free, and the risks are not symmetrical.
Subject-to: the due-on-sale clause
Nearly every conventional mortgage contains a clause letting the lender call the full balance due if the property transfers. Taking title subject-to an existing loan triggers that clause on paper. In practice lenders rarely accelerate a performing loan — but "rarely" is a risk you're accepting, not a risk that doesn't exist, and you should underwrite as though it could happen. That means knowing what it would cost you to refinance or sell in a hurry, and knowing it before you sign.
You also inherit the seller's insurance problem. The existing policy is in their name, and a claim on a property they no longer own is a fight nobody wants. This gets solved with the right policy structure at closing, not afterward.
Lease option: you don't own anything yet
Your position is contractual, not recorded ownership. If the seller stops paying the underlying mortgage, a foreclosure can wipe out an option you paid real money for. If they take out a second lien, sell to someone else, or die intestate, your option is a claim you may have to litigate rather than a deed you already hold.
Some states also treat a long lease option with a large option premium as an equitable mortgage — meaning a court may read your "option" as a disguised sale with foreclosure rights attached. That's a good outcome sometimes and a bad one other times, and it turns entirely on state law and how the paperwork reads.
Both structures live or die on the paperwork, and both vary meaningfully by state. Nothing here is legal advice — run any creative structure past an attorney licensed where the property sits before you sign.
The numbers to run on each
The two structures don't share a math problem, which is why comparing them by gut feel goes wrong so often.
Subject-to
- Existing loan balance, rate, and remaining term. A 3% assumable-in-practice loan on a 22-year runway is worth real money in a 7% market. That spread is the whole deal.
- Cash to seller — often small, sometimes zero, occasionally the arrears alone.
- Arrears, escrow shortages, and transfer costs due at closing.
- Monthly position: payment against market rent, plus what the property actually costs to hold.
- Your exit: hold it, refinance out later, resell it, or wrap it to an end buyer.
Lease option
- Option premium paid up front, and whether it credits toward the purchase price.
- Strike price and option term. You're taking a position on where value lands years out.
- Monthly spread between what you pay the seller and what the property produces.
- Rent credits, if any, and how they affect your basis at exercise.
- Back-end profit if you exercise, and what you walk away from if you don't.
The comparison that actually matters isn't "which structure is better." It's what the same property returns under each one, side by side, with the seller's real numbers plugged in. That's the point where most investors stop analyzing and start guessing — and it's precisely what Appraize models, running lease option and subject-to alongside the other six exits on the same property so the comparison is arithmetic instead of instinct.
When neither one fits
Plenty of sellers want a real price and a real closing, and no amount of structure will change that. If they have equity, want cash, and aren't in a hurry, you're looking at a seller finance conversation, a novation, or a straight offer — not a creative workaround.
The mistake isn't picking the wrong structure. It's deciding on a structure before you understand the seller, then bending the deal to fit the tool you already had in your hand.
The short version
Ask one question before anything else: is this seller willing to sign a deed today?
If yes, and the equity is thin, look hard at subject-to. If no, and they want income or a future price, look at a lease option. If they want cash and a closing, you're in a different conversation entirely.
Then run both sets of numbers before you make the offer — because the structure that fits the seller and the structure that pays you are not automatically the same one.
