Most conventional loans are not assumable. Nearly every conventional mortgage contains a due-on-sale clause that lets the lender demand full repayment when the property changes hands, which shuts down any attempt to take over the seller’s existing rate and terms. Two meaningful exceptions cut through that default: adjustable-rate mortgages backed by Fannie Mae are usually assumable by their own terms, and a set of family and life-event transfers is protected from due-on-sale enforcement by federal law. Outside those categories, a conventional lender approving an assumption is rare, and it usually only happens when the loan is already delinquent.
Why the Due-on-Sale Clause Shuts the Door
The due-on-sale clause is the reason. It gives the lender the right to call the entire remaining balance due immediately when ownership transfers. Lenders write it in to protect their return on capital: if the seller locked in 3.5% five years ago and current rates are 7%, the lender loses money every month that old rate stays alive. Acceleration lets the bank redeploy the capital at today’s rates.
Fannie Mae and Freddie Mac both require their servicers to enforce this. When a servicer learns a property has changed hands, Fannie Mae’s guidelines direct it to notify the new owner that the loan is due and payable, giving 30 days to either pay the balance in full or apply for new financing. If neither happens, the servicer begins foreclosure.1Fannie Mae. Enforcing the Due-on-Sale (or Due-on-Transfer) Provision Freddie Mac’s servicing guide takes the same approach, requiring acceleration whenever a due-on-sale clause exists and a transfer has occurred, unless a specific exception applies.2Freddie Mac. General Policy and Federal Regulation on Transfers of Ownership and Assumptions These two entities own or guarantee the vast majority of conventional mortgages in the country, which makes their posture the industry standard.
When an ARM Is Assumable
The one open-market exception most people miss sits inside adjustable-rate loans. Fannie Mae’s selling guide states that its ARMs are “usually assumable,” though certain ARM plans do restrict assumability.3Fannie Mae. Adjustable-Rate Mortgages (ARMs) If an ARM plan includes a conversion option and the borrower has already exercised it to lock in a fixed rate, the loan can no longer be assumed. While the loan remains in its adjustable phase, the door stays open.
This tends to matter only when the ARM’s current rate is meaningfully below what a new borrower could get on the open market. The new buyer still needs lender approval and must meet the servicer’s creditworthiness standards at the time of the assumption. But unlike a fixed-rate conventional mortgage, the contract already contemplates the transfer. If you are trying to figure out whether a specific conventional loan can be assumed, the first question is whether it is an ARM and whether its plan permits assumptions.
Family and Life-Event Transfers Protected by Federal Law
Even when a conventional loan has a due-on-sale clause, federal law forbids the lender from enforcing it in certain transfers. The Garn-St Germain Depository Institutions Act, at 12 U.S.C. ยง 1701j-3, covers residential property with fewer than five dwelling units. The protected transfers include:4Office of the Law Revision Counsel. 12 USC 1701j-3 – Preemption of Due-on-Sale Prohibitions
- A transfer on the borrower’s death to a relative, and a transfer to the surviving co-owner when a joint tenant or tenant by the entirety dies.
- A transfer from the borrower to a spouse or child, whatever the reason.
- A transfer to a spouse under a divorce decree or legal separation agreement.
- A transfer into a revocable living trust, as long as the borrower stays a beneficiary and the transfer does not change who occupies the home.
- The granting of a subordinate lien or a lease of three years or less.
The important thing about these protections is that they do not require lender approval. The loan continues on its existing terms and the lender has no legal right to intervene. The statute does not explicitly require the person receiving the property to occupy it as a primary residence for most of these categories; the trust exception is the only one that specifically addresses occupancy, by requiring that the transfer not “relate to a transfer of rights of occupancy.”4Office of the Law Revision Counsel. 12 USC 1701j-3 – Preemption of Due-on-Sale Prohibitions
Freddie Mac’s Added Categories
Freddie Mac mirrors the federal exceptions and adds a few of its own. Its servicing guide extends protection to transfers between domestic partners rather than just spouses, and it treats grandparents and siblings as family members who can receive the property without triggering acceleration. For those family transfers, Freddie Mac requires the property to be occupied or intended to be occupied by the borrower, but it waives that occupancy requirement when the transfer follows the borrower’s death.2Freddie Mac. General Policy and Federal Regulation on Transfers of Ownership and Assumptions
Freddie Mac’s Approved Family Assumption
Beyond those automatic exceptions, Freddie Mac allows certain transfers with lender approval when three conditions are all met: at least 12 months have passed since origination, the servicer has satisfied any mortgage insurance requirements tied to the transfer, and the new owner either occupies the property as a primary residence and is a qualifying family member (parent, child, grandparent, grandchild, sibling) or meets other conditions set by the guide.2Freddie Mac. General Policy and Federal Regulation on Transfers of Ownership and Assumptions The path is narrower than an open-market assumption, but it opens up family transactions that fall outside the Garn-St Germain categories.
Assumption vs. Buying “Subject To”
These two get confused constantly, and the difference has real financial consequences. In a formal assumption, the lender approves the new buyer, who takes on full legal responsibility for the debt, and the original borrower can then request a release of liability. In a subject-to purchase, the buyer takes the deed and starts making payments while the lender is never notified. The loan stays in the seller’s name, and the seller remains fully liable.
Buying subject to an existing mortgage is how some real estate investors try to capture a low rate on a conventional loan. The problem is that it directly violates the due-on-sale clause. If the lender discovers the transfer, it can demand immediate payment in full and start foreclosure if that payment does not arrive. The seller carries real risk too: the loan keeps appearing on their credit report, counts against their debt-to-income ratio for future borrowing, and any missed payment by the new occupant damages the seller’s credit. Standard mortgage security instruments state that the borrower is not released from their obligations unless the lender agrees in writing.
The Equity Gap
Even when a conventional loan is technically assumable, the math often kills the deal. The buyer assumes the remaining loan balance, not the property’s current value. If the seller bought for $350,000 five years ago and the balance is now $290,000, but the home is worth $430,000, the buyer has to come up with $140,000 to cover the seller’s equity. That gap has to be paid in cash, through a second mortgage, or through some other arrangement between buyer and seller.
On government-backed loans, a small industry of second-lien providers has grown up to bridge this gap. For conventional assumptions, finding a lender willing to sit behind an assumed first lien is considerably harder. The larger the gap, the less financial advantage the assumption offers, because the buyer ends up financing a bigger portion at current market rates anyway.
Qualifying and What It Costs
When a conventional loan is eligible for assumption, the underwriting looks a lot like qualifying for a new mortgage. Fannie Mae requires the servicer to evaluate the prospective buyer under the underwriting guidelines in effect at the time of the assumption, not the guidelines that applied when the loan originated.5Fannie Mae. Qualifying Mortgage Assumption Workout Option That means today’s credit score requirements, today’s debt-to-income thresholds, and a current valuation of the property. Plan on providing recent pay stubs, tax returns, bank statements showing liquid assets, and authorization to pull your credit.
Private mortgage insurance adds a wrinkle that catches many buyers off guard. PMI does not automatically transfer to a new borrower. The mortgage insurer has its own underwriting standards, and the servicer has to satisfy whatever mortgage insurance requirements apply to the transfer before closing. After the assumption goes through, Fannie Mae’s rules limit when you can cancel PMI. If you want to cancel based on the property’s current value, you must first build a 24-month payment history under your name on the assumed loan; during the first 23 months, the servicer cannot approve a borrower-initiated termination of mortgage insurance based on a new appraisal.6Fannie Mae. Termination of Conventional Mortgage Insurance Even if you believe the loan-to-value ratio drops below 80% at the time of assumption, PMI likely sticks around for at least two years.
Conventional assumption fees are typically calculated as a percentage of the loan amount rather than a flat figure, and the exact cost depends on the servicer and the terms of the original note. For comparison, FHA caps its assumption processing fee at $1,800 and VA loans have a maximum fee of $300. Conventional lenders face no federal cap, so the fee can run meaningfully higher on a large balance. Add recording costs for the new deed and any modification agreement, generally $10 to $90 depending on the county.
Timelines vary. FHA guidelines require the servicer to complete its creditworthiness review within 45 days of receiving all necessary documents. Conventional servicers have no equivalent federal deadline, and the process can stretch to 60 or 90 days, especially when the loan is delinquent and the servicer needs Fannie Mae or Freddie Mac approval before proceeding. If you have backup financing lined up, keep the rate lock alive.
Getting the Seller Released From Liability
This is where assumptions go wrong most often, and it hits the seller harder than the buyer. Unless the lender issues a written release of liability, the original borrower stays on the hook for the full debt even after the property has transferred and the new owner is making payments. Standard mortgage documents are explicit: the borrower is not released from obligations unless the lender agrees to that release in writing.
On a conventional loan, the release is not automatic. The lender evaluates the new borrower’s creditworthiness, and if it is satisfied that the new borrower can carry the debt, it may agree to release the original borrower. “May” is the operative word. A seller heading into an assumption should get the release of liability in writing as part of the assumption agreement. Without it, the debt stays on the seller’s credit report and counts against their borrowing capacity until the loan is paid off or refinanced.