A subject to deal in real estate is a purchase where the buyer takes ownership of the property while the seller’s existing mortgage stays in place and unchanged. The deed transfers, but the loan does not. The buyer starts making the monthly payments on the seller’s note, keeping whatever interest rate and terms the seller originally locked in, and the lender’s legal relationship stays with the seller. These arrangements become popular when interest rates climb, because a buyer can effectively step into a much cheaper loan than they could qualify for on the open market, and sellers under financial pressure get a way out without having to pay the mortgage off first.
How the Transaction Works
The whole strategy turns on the difference between two documents most homeowners treat as interchangeable. The deed is proof of ownership, recorded at the county. The promissory note is the borrower’s personal promise to repay the loan. In an ordinary sale, both effectively change hands at closing. In a subject-to deal, only the deed moves. The seller signs ownership over to the buyer, and nobody touches the note. The original borrower is still on the hook with the lender, and the loan terms keep running as if the sale never happened.
Because the buyer never signs anything with the bank, the buyer has no personal liability for the debt. If payments stop, the lender forecloses on the property; it cannot chase the buyer for the balance, because the buyer never agreed to pay it. The lender’s recourse runs against the collateral, not against a person who was never on the loan. That separation of ownership from debt is what draws investors who want to control property without qualifying for new financing.
This is not the same as a formal loan assumption. In an assumption, the lender reviews the new borrower, approves the transfer, and releases the original borrower. In a subject-to purchase, the lender is not asked and usually does not know the sale happened until something in public records, tax filings, or insurance paperwork flags the change.
The Due-on-Sale Clause
Nearly every modern mortgage contains a due-on-sale clause, and federal law lets lenders enforce it. The Garn-St. Germain Depository Institutions Act preempts state laws that would otherwise prevent a lender from calling a loan when the property changes hands without consent.1eCFR. 12 CFR Part 191 – Preemption of State Due-on-Sale Laws Once the lender discovers a transfer, it can demand the full remaining balance immediately.
The word “can” is doing real work. Acceleration is the lender’s option, not its obligation. A servicer receiving on-time payments on a loan bearing an above-market rate has little reason to call it. But if market rates fall, or if the servicer’s system flags the ownership change through a property tax update or an insurance policy change, the risk becomes concrete. If the loan is called, the buyer has to refinance, pay the balance in full, or lose the property.
Transfers the Lender Cannot Accelerate
The same federal statute that authorizes the clause also blocks lenders from accelerating certain transfers on residential property with fewer than five units:2Office of the Law Revision Counsel. 12 US Code 1701j-3 – Preemption of Due-on-Sale Prohibitions
- Transfer into a living trust where the borrower remains a beneficiary and occupancy does not change.
- Transfer to the borrower’s spouse or children.
- Transfer on the borrower’s death by will, joint tenancy, or operation of law.
- Transfer to a spouse under a divorce decree or property settlement.
- A lease of three years or less with no purchase option.
The trust exemption is the one subject-to investors reach for most often. Some buyers place the property in a land trust naming the seller as beneficiary, then later swap the beneficial interest to the buyer. Whether that sequence actually satisfies the statute or simply delays detection is debated among real estate attorneys, and a lender that views it as circumvention rather than a qualifying transfer creates real legal exposure.
What the Seller Continues to Carry
The mortgage stays on the seller’s credit report for the life of the loan. Every on-time payment the buyer makes shows up as the seller’s; every late payment lands on the seller’s score. A single mortgage late can produce a noticeable drop, and 60- or 90-day delinquencies do progressively more damage. The seller has no direct control over whether the buyer actually pays.
The debt also stays on the seller’s debt-to-income ratio. When the seller applies for a new loan, underwriters see an open mortgage. Within the first 12 months, conventional underwriting can discount the payment by roughly 75 percent if the seller documents a lease or payment agreement with the buyer. After 12 months of documented third-party payments, many lenders will disregard the old mortgage entirely. Getting that documentation accepted is not automatic, and sellers who don’t plan for it can find themselves unable to buy their next home.
The worst case is direct: the buyer stops paying, the lender forecloses, and the seller takes a foreclosure hit despite no longer owning the property. In states that allow deficiency judgments, the seller can also remain liable for any shortfall. A seller entering a subject-to arrangement is trusting a stranger with their financial identity for potentially decades.
Due Diligence Before Closing
Most subject-to deals succeed or fail in the preparation phase. Skipped steps become expensive problems months or years later.
Verify the Existing Loan
The buyer needs a recent mortgage statement showing the exact principal balance, current interest rate, monthly payment, and escrow status for taxes and insurance. Whether the loan is fixed-rate or adjustable changes the entire calculation; an ARM that resets in two years is a different investment than a 30-year fixed at 3.5 percent.
To talk to the seller’s servicer directly, the buyer needs a signed third-party authorization from the seller. The Consumer Financial Protection Bureau publishes a model form that grants permission to discuss account details, payment status, and workout options with the servicer.3Consumer Financial Protection Bureau. Borrower Authorization of Third Party Without it, the servicer will refuse to share anything.
Run a Title Search
A preliminary title report shows what else is attached to the property. Junior liens, tax liens, unpaid judgments, HOA assessments, and recorded easements all travel with the title. Taking a property subject to the first mortgage without discovering a second lien or an IRS lien means inheriting debt that wasn’t part of the deal.
Prepare the Deed
The deed transferring ownership needs the exact legal description of the property, including lot number and subdivision details drawn from the existing deed or tax records. Buyer and seller names must match the current title precisely. Common deed types include grant deeds and quitclaim deeds, and the correct form depends on local recording rules. A recording error from a name mismatch or bad legal description can cloud title for years.
Structuring the Insurance
Insurance is where subject-to deals most often come apart. The mortgage requires hazard insurance on the property, and if the coverage situation gets confused, the servicer can impose force-placed insurance, which is dramatically more expensive than a standard policy. Federal law requires the servicer to send two written notices before charging force-placed premiums, with specific timing between them, and only then if the borrower fails to provide proof of coverage.4Office of the Law Revision Counsel. 12 US Code 2605 – Servicing of Mortgage Loans and Administration of Escrow Accounts Those premiums get charged to escrow, inflate the monthly payment, and can push the loan into delinquency.
The practical fix is to bind a new landlord or investment-property policy with the buyer (or the buyer’s entity) as first named insured and the lender’s mortgagee clause listed correctly. Building coverage needs to meet or exceed the outstanding loan balance. Simply adding the buyer as an “additional insured” on the seller’s old homeowner policy is not enough; if the insurer later discovers the named insured no longer owns the property, a claim can be denied entirely, leaving both buyer and lender uncovered.
Tax Consequences on Both Sides
Seller: The Mortgage Balance Is Proceeds
When property transfers subject to an existing mortgage, the IRS treats the unpaid balance as part of the gross proceeds of the sale. The 1099-S instructions are explicit: if the buyer takes the property subject to a liability, that liability is treated as cash and included in gross proceeds.5Internal Revenue Service. Instructions for Form 1099-S Proceeds From Real Estate Transactions A seller who thought there were no “proceeds” because no cash changed hands still has a reportable transaction equal to the mortgage balance plus any other consideration.
If the seller receives additional payments over time, the deal may qualify for installment sale reporting. When the assumed mortgage is less than or equal to the seller’s adjusted basis, it’s treated as a recovery of basis rather than a payment. When it exceeds basis, the excess is a payment received in the year of sale, and the gross profit percentage on future installment payments is 100 percent.6Internal Revenue Service. Publication 537 (2025), Installment Sales That distinction can dramatically change the seller’s tax bill for the year of the transaction.
Buyer: The Mortgage Interest Deduction Problem
To deduct mortgage interest, the IRS generally requires that the mortgage be a secured debt on a qualified home in which the taxpayer has an ownership interest, and that the taxpayer be legally obligated on the debt.7Internal Revenue Service. Publication 936, Home Mortgage Interest Deduction A subject-to buyer holds the deed, so ownership is satisfied. But by definition the buyer is not liable on the note; the lender never approved them, and they never signed the promissory note.
The Form 1098 reporting the interest goes to the seller, who remains the borrower of record. Some tax practitioners argue that equitable ownership plus actual payment should support the deduction, but this is an area of genuine uncertainty between IRS position and case law. A buyer whose investment math depends on writing off mortgage interest needs professional tax advice before closing, not after.
The Equity Skimming Line
Subject-to investing is legal. A particular pattern of conduct with government-backed loans is not. Under federal law, anyone who intentionally buys properties with FHA-insured or VA-guaranteed loans, lets those loans default, and pockets the rental income faces fines up to $250,000, imprisonment for up to five years, or both.8Office of the Law Revision Counsel. 12 US Code 1709-2 – Equity Skimming; Penalty; Persons Liable The statute targets a pattern of buying, defaulting, and collecting rent, and a single property purchase is expressly outside its reach.
The law applies regardless of whether the buyer was obligated on the loan, language that specifically forecloses the argument that a subject-to buyer has no duty to pay. Liability reaches beyond the individual purchaser to beneficial owners of business entities, officers, directors, and agents involved in the transaction. Running the acquisitions through an LLC does not insulate the people behind it.
Exit Strategies
A subject-to deal is not permanent. The old mortgage eventually has to be resolved, and the buyer should walk in with a plan.
Refinancing is the most common exit. Once the buyer has built equity through payments, appreciation, or improvements, they take out a new loan in their own name, pay off the seller’s mortgage, and the seller is finally released. Lenders evaluating the refinance will want to see documented ownership, a payment history, and enough property value to support the new loan. Many investors aim to refinance within one to three years, though the timing depends on the buyer’s financial profile and market conditions.
Selling the property is the other clean exit. Sale proceeds pay off the existing mortgage and end the seller’s exposure. Investors who buy, renovate, and resell run this as their primary play. A third option is assigning a lease-option to a tenant-buyer who later obtains their own financing, though that adds complexity and seller-financing regulation to the picture.
The exit to avoid is no exit at all. A buyer who cannot refinance or sell and then stops paying triggers the exact foreclosure the seller feared going in. A realistic plan to retire the original mortgage is what distinguishes a responsible subject-to investor from someone building a financial time bomb around a stranger’s credit.