An assumption of debt is an arrangement in which a new party takes over responsibility for paying someone else’s loan. It shifts who makes the payments, but it does not automatically release the original borrower. Whether you walk away clean or stay on the hook depends on one thing: whether the creditor agrees in writing to let you go. Miss that step and you can be pursued for a debt you thought was someone else’s problem years after the closing table.
This trips up sellers, divorcing spouses, and heirs more than any other part of the process. Someone promises to pay, payments get made for a while, and then a default surfaces and the collection notice lands in the original borrower’s mailbox.
Four Arrangements People Call “Assumption”
The word gets used loosely for several very different deals. Knowing which one you are actually in tells you what your exposure looks like.
Formal Assumption
The new party agrees to become directly liable to the creditor. The creditor can now pursue the new party for missed payments. Whether the original borrower is also released is a separate question that depends on the creditor’s written consent.
Novation
A novation is the cleanest outcome. All three parties — creditor, original borrower, new borrower — agree that the new debtor replaces the original entirely, and the original obligation is extinguished. The original borrower has no further liability, and the creditor cannot change its mind later if the new borrower defaults. Novation has to be express. Courts will not imply it from ambiguous language or conduct.
“Subject To” Purchase
A buyer who takes property “subject to” an existing mortgage gets the deed and agrees to make payments, but never accepts personal liability for the loan. The original borrower remains the only person the lender can sue. If the buyer stops paying, the lender forecloses on the property and then pursues the original borrower for any deficiency. Common in creative real estate deals, and brutal for the original borrower, who carries all the risk with none of the control.
Indemnity Agreement
An indemnity agreement is a private promise between the original borrower and the new party. The new party agrees to reimburse the original borrower if the creditor comes after them. The creditor is not part of this arrangement and has no obligation to honor it. The original borrower stays fully liable to the lender. This is a backstop, not a transfer.
What the Creditor’s Consent Has to Look Like
The single most important requirement in any assumption is the creditor’s explicit, written consent. Lenders evaluate creditworthiness before extending a loan, and swapping in a new debtor changes their risk. No lender is obligated to accept a substitute, which is why the creditor holds the leverage in every assumption negotiation.
A workable assumption agreement clearly identifies the debt being transferred, including the original contract date, outstanding balance, and interest rate. It contains an unambiguous statement that the new party accepts full liability. And it spells out whether the creditor is granting a full release of the original borrower — making it a novation — or merely accepting the new party as an additional or primary obligor while keeping the original borrower on the hook.
Promises to pay someone else’s debt generally must be in writing to be enforceable. This comes from the Statute of Frauds, which applies in every state, though the specific rules vary. An oral promise to assume another person’s debt is typically unenforceable against the person who made it. The exception is when the promisor is acting primarily for their own benefit rather than as a favor to the original borrower.
For secured debts like mortgages, the paperwork grows. The lender must approve the new borrower’s credit, any existing defaults must be cured before closing, and the transfer documents must be recorded. The agreement should also address escrow accounts, insurance, and who pays the administrative and legal fees the lender charges for processing the assumption.
Residential Mortgages and the Due-on-Sale Clause
Most residential mortgages include a due-on-sale clause that lets the lender demand immediate full repayment if the property is transferred without written consent. This is how lenders control who becomes responsible for the loan and how they renegotiate terms when interest rates have risen.
Federal law blocks lenders from enforcing due-on-sale clauses in certain family transfers of residential properties with fewer than five units. Under the Garn-St. Germain Depository Institutions Act, lenders cannot accelerate the loan when the property passes to a relative through the borrower’s death, to a spouse in a divorce or property settlement, to a spouse or children of the borrower, or into a living trust where the borrower stays a beneficiary. Short-term leases and junior liens are also protected.1Office of the Law Revision Counsel. 12 U.S. Code 1701j-3 – Preemption of Due-on-Sale Prohibitions
Here is the trap. Garn-St. Germain stops the lender from calling the loan due. It does not release the original borrower from the note. A surviving spouse who inherits the home and keeps paying is protected from acceleration, but unless they complete a formal assumption or refinance, the deceased borrower’s estate may still be obligated on the note.
FHA and VA Loan Assumptions
Government-backed mortgages are the residential loans most commonly assumed, because their program rules explicitly allow assumptions while most conventional mortgages let the lender simply refuse.
FHA
All FHA-insured mortgages are assumable. For loans originated after December 1, 1986, the new borrower has to pass a creditworthiness review meeting FHA credit and income standards, much like a new loan applicant. The lender participates in the process and must approve the new borrower. FHA caps the processing fee a lender can charge.
The appeal is locking in the original borrower’s interest rate. When rates have risen since the loan was written, keeping the existing rate can save tens of thousands over the life of the loan. The new borrower still has to cover the difference between the sale price and the remaining balance with cash or a second loan.
VA
VA-guaranteed loans are also assumable, and the new borrower does not have to be a veteran. The VA requires the loan to be current, the new borrower to contractually accept full liability, and the new borrower to meet VA credit and underwriting standards.2Department of Veterans Affairs. VA Circular 26-23-10 The VA charges a funding fee of 0.5% of the remaining loan balance on assumptions, with veterans who have a service-connected disability exempt.3Department of Veterans Affairs. Funding Fee Schedule for VA Guaranteed Loans
The detail that matters most to sellers is VA entitlement. If the new borrower is not a veteran, or is a veteran who does not substitute their own entitlement, the selling veteran’s entitlement stays tied up in the loan until it is paid off. That means the seller cannot use their VA benefit to buy another home. Only when an eligible veteran buyer substitutes their entitlement does the seller get theirs restored.2Department of Veterans Affairs. VA Circular 26-23-10
To be released from personal liability, the selling veteran has to submit VA Form 26-6381 with the required documentation, and the new borrower must assume liability to both the loan holder and the government. Skip that process and the selling veteran stays personally liable even after the new borrower takes over payments.4Department of Veterans Affairs. Application for Assumption Approval and Release from Personal Liability to the Government on a Home Loan – VA Form 26-6381
Where the Original Borrower Stands After the Deal
What happens to the original borrower depends entirely on what kind of consent the creditor gave.
With a full release through novation, the original borrower is completely discharged. The creditor accepted the new debtor as the sole obligor and cannot pursue the original borrower for any reason, ever, including a default years later. This is the outcome worth negotiating for.
Without a release, the original borrower effectively becomes a guarantor. The new borrower makes the payments and bears primary responsibility, but if they default, the creditor can pursue the original borrower for the full amount. This is where people get burned. They leave closing believing the debt is someone else’s problem and receive a collection notice months or years later.
An original borrower stuck in that position does have recourse. If forced to pay after the new borrower defaults, the original borrower gains subrogation rights against the new borrower and retains indemnity rights under the assumption agreement. In practice, though, a new borrower who defaulted on the lender rarely has assets to pay the original borrower either. The right exists. Collecting on it is another matter.
Credit reports track this too. After a full assumption with release, the account should show as closed and transferred. After a simple assumption where the original borrower keeps liability, the account stays on their credit report with a notation that it has been assigned. Late payments by the new borrower can still damage the original borrower’s credit.
The Tax Bill Sellers Don’t Expect
Debt assumption creates tax consequences that catch sellers off guard because no cash changes hands, but the IRS treats the transaction as if it did.
The rule comes from the Supreme Court’s decision in Crane v. Commissioner: when a buyer takes property subject to or assumes the seller’s debt, the amount of that debt is included in the seller’s “amount realized” on the sale.5Justia. Crane v Commissioner, 331 U.S. 1 (1947) The tax code defines “amount realized” as the total of all money received plus the fair market value of any other property received.6Office of the Law Revision Counsel. 26 USC 1001 – Determination of Amount of and Recognition of Gain or Loss Being freed from an obligation is treated as economically equivalent to receiving cash.
An example. You sell a commercial building with an adjusted basis of $500,000, receive $200,000 in cash, and the buyer assumes your $600,000 mortgage. Your amount realized is $800,000. Your taxable gain is $300,000, even though you only pocketed $200,000. The $600,000 in debt relief is income you never touch but still owe tax on.
The Court extended this in Commissioner v. Tufts, holding that the full amount of nonrecourse debt is included in the amount realized even when the debt exceeds the property’s fair market value.7Justia. Commissioner v Tufts, 461 U.S. 300 (1983) A seller cannot avoid the tax by arguing the property was worth less than the mortgage balance.
For the buyer, the assumed debt is included in the property’s cost basis.8Office of the Law Revision Counsel. 26 USC 1012 – Basis of Property; Cost Using the same numbers, the buyer’s basis in the building would be $800,000. That higher basis produces larger depreciation deductions on business property and a smaller gain when the buyer eventually sells.9Internal Revenue Service. Instructions for Form 4797
How to Protect Yourself
If you are the original borrower, push for a novation. A simple assumption that leaves you as a backstop guarantor is the worst outcome for you and the best for everyone else at the table. If the creditor refuses to release you entirely, negotiate for notice provisions that require the lender to alert you before the loan goes seriously delinquent. Finding out about a default early gives you options that disappear once collections start.
If you are the new borrower, confirm in writing exactly what you are taking on. Verify the outstanding balance, interest rate, payment schedule, and whether any defaults or late fees exist. Curing someone else’s missed payments as a condition of the assumption is common, and it should be reflected in the price.
Both parties should keep copies of every document: the assumption agreement, the creditor’s consent letter, any novation or release, and the original loan documents. These records may not matter for years. When a dispute surfaces, the party with the paper wins and the party without it pays.