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Decide by comparing your net sale proceeds, replacement-home financing, cash needed at the next closing, and the way a lender will underwrite both homes if the sale and purchase overlap. A rate difference by itself is not enough.
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The short answer: a low rate is valuable, but it usually is not portable
“Keeping” a low-rate mortgage can mean two different things:
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- Keeping the loan on the home you sell. The debt is normally paid off when ownership changes.
- Transferring the loan to a new property. The official guidance reviewed here does not establish a general right to move a seller’s mortgage to another house. Check your note, mortgage or deed of trust, and ask the servicer for a written answer before assuming portability exists.
Fannie Mae’s consumer guidance describes a new owner assuming a loan secured by the property being sold; it does not promise that the seller can carry the debt to a different property. Its FAQ states: “Only certain types of mortgage loans are assumable and assuming a loan does not automatically result in the release of liability for an existing borrower.” Fannie Mae’s ownership-transfer guidance also tells borrowers to contact the servicer about eligibility and costs.
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Therefore, budget for a payoff unless your own documents and servicer confirm an approved assumption or another contractual transfer mechanism.
What happens to the mortgage when you sell
The payoff is part of the seller’s closing
Your closing agent obtains a payoff statement from the servicer. The statement gives the amount needed to satisfy principal, accrued interest, and any permitted charges through a specified date. The mortgage payoff appears among the seller-side amounts on the settlement statement or Closing Disclosure. The Consumer Financial Protection Bureau’s Your Home Loan Toolkit illustrates how an existing loan payoff reduces the seller’s cash from the transaction.
Estimate your cash this way:
Sale price − mortgage payoff − selling expenses = estimated net proceeds.
Selling expenses can include commissions, transfer charges, taxes, attorney or escrow fees, repairs or credits negotiated with the buyer, and other transaction-specific costs. Gross equity—the market value minus the balance shown on a recent statement—is not the same as cash available after closing.
The payoff date matters
Interest usually accrues until the payoff date, so a quote can expire. Request an updated statement if the closing date changes. Ask the closing agent how the final amount, per-diem interest, and any escrow balance will be handled; do not use an old account balance as a substitute for a payoff quote.
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Can the buyer assume your low-rate mortgage?
Possibly, but only if the loan documents, applicable program rules, and servicer process allow it. An assumption lets the buyer take over the existing debt on the same house, generally subject to credit, income, property, and other underwriting requirements. The buyer must also fund the difference between the purchase price and the assumed loan balance with cash or separate financing.
| Loan or situation | What the cited guidance establishes | What you must verify |
|---|---|---|
| Conventional fixed-rate loan delivered to Fannie Mae | Fannie Mae’s Selling Guide says these loans are not assumable as of the note date. | Whether your loan was sold to Fannie Mae, another investor, or remains subject to different contract terms. |
| Other conventional fixed-rate loans | Assumption is not a universal right; protected situations and individual documents control. | The note, security instrument, investor rules, servicer approval process, and fees. |
| Adjustable-rate mortgage (ARM) | Fannie Mae consumer material describes ARMs as potentially assumable by an acquirer, subject to requirements. | Current loan terms, adjustment rules, buyer qualification, and servicer approval. |
| FHA, VA, or USDA-insured mortgage | Fannie Mae’s consumer overview identifies these government-insured loans as potentially assumable by an acquirer, subject to loan and servicer requirements. | The applicable agency rules, funding or guarantee issues, buyer eligibility, fees, and release of liability. |
Do not advertise a loan as assumable until the servicer confirms the process in writing. Ask for the application, required documents, processing time, assumption fee, and the exact date on which the buyer becomes responsible for payments.
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The buyer’s assumption and your release of liability are separate questions. Fannie Mae says release generally requires the new borrower to pass a financial and credit evaluation. Without a documented release, you may remain responsible if the buyer fails to pay.
Fannie Mae underwriting guidance also treats an assumed mortgage without release of liability as a contingent liability. It describes a policy exception under which a lender need not count that payment when it documents at least 12 months of regular, timely payments using the required evidence. That is a Fannie Mae underwriting rule, not a guarantee for every lender or loan program. Obtain the written release before treating the obligation as gone.
Why a due-on-sale clause matters
Many mortgages contain a due-on-sale or due-on-transfer clause. It can allow the lender to demand repayment when the property is transferred, unless an exemption applies. Fannie Mae’s servicing guidance explains enforcement of this provision and the exceptions it recognizes: Enforcing the Due-on-Sale (or Due-on-Transfer) Provision.
Federal law lists protected categories that can restrict enforcement, including certain transfers after a borrower’s death, transfers to a spouse or children, some divorce-related transfers, and specified living-trust transfers. The statute is at 12 U.S.C. § 1701j-3. These exemptions do not create a general right to sell to an unrelated buyer while leaving the mortgage in place. A standard arm’s-length sale normally requires payoff or an approved assumption.
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The replacement purchase creates a separate qualification problem. If you still own the old home when the new lender underwrites your application, the lender may count both properties’ principal, interest, taxes, insurance, association dues, and other applicable housing costs—often referred to as PITIA.
Fannie Mae’s current policy for a principal residence pending sale generally requires both the current and proposed PITIA in underwriting. It provides a documentation exception when there is an executed sales contract and financing contingencies have been cleared. Read the policy at Qualifying Impact of Other Real Estate Owned. Other investors and loan programs can use different rules.
| Timing or documentation | Potential underwriting effect | What to ask the lender |
|---|---|---|
| Old home has not sold and no firm contract exists | Both housing obligations may be included in qualification. | What income, reserves, debt-to-income limit, and PITIA calculation will be used? |
| Executed sale contract, required contingencies cleared | A program-specific exception may allow different treatment. | Which documents prove the contract, contingency removal, and expected closing date? |
| Sale proceeds will fund the new down payment or closing costs | Net proceeds must be documented; gross equity is insufficient. | Will the lender require a settlement statement, payoff, and evidence of funds before or simultaneously with the purchase? |
If sale proceeds are part of your plan, Fannie Mae requires documentation showing sufficient net cash proceeds in its Anticipated Sales Proceeds guidance. A lender may not let you count money that exists only as an estimated sale price.
How to compare selling now with keeping the loan on the current home
Build the comparison around the actual move rather than the headline interest rate.
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1. Calculate usable sale proceeds
- Get a written payoff quote valid for the expected closing date.
- Subtract commissions, taxes, escrow or attorney charges, concessions, repairs, and other selling costs.
- Allow for changes if the closing date, sale price, or negotiated credits change.
2. Price the replacement financing
- Obtain a realistic rate quote or preapproval for the next property.
- Compare the new loan amount, down payment, closing costs, points, reserves, and total monthly housing cost.
- Include taxes, insurance, association dues, and maintenance assumptions in your cash-flow plan.
3. Model the overlap period
Ask what happens if you buy before selling, the sale is delayed, or the buyer’s financing fails. Determine whether you can carry both PITIA amounts and how many months of reserves the lender requires.
4. Value an assumption only when it is documented
A below-market loan can make the property attractive to an eligible buyer, but the value depends on the remaining balance, rate, term, buyer’s ability to qualify, and the gap between the purchase price and assumed debt. It does not automatically increase your sale proceeds, and it does not make the loan portable.
5. Compare nonfinancial constraints
- How long you expect to own the next home.
- Whether selling now meets your required moving date.
- Emergency savings after the transaction.
- Risk tolerance if rates, prices, or the sale timeline change.
The official sources do not establish a universal break-even rate or savings threshold. Your decision requires the actual balance, payoff quote, transaction costs, next-home budget, available financing, expected holding period, and cash needs.
What to do before listing or making an offer
- Read the loan documents. Review the promissory note, mortgage or deed of trust, and the assumption language in your Closing Disclosure. The CFPB’s regulation commentary explains that assumption disclosures can be conditional or uncertain, including conditions tied to the subsequent borrower’s creditworthiness and protection of the creditor’s security: 12 CFR 1026.37 commentary.
- Request a payoff statement. Ask how long it is valid, what daily interest applies, and whether any fees or escrow adjustments will be included.
- Contact the servicer in writing. Ask whether a buyer assumption is permitted, which buyers qualify, what fees and documents are required, how long approval takes, and what produces a release of liability. Fannie Mae’s consumer guidance specifically recommends contacting the servicer for eligibility and costs.
- Ask the new lender for a written overlap analysis. Find out whether it will count the existing mortgage, what sale-contract evidence it needs, and whether proceeds must be available before or at the new closing.
- Ask the closing agent for a proceeds worksheet. Confirm how the mortgage payoff, taxes, commissions, credits, and other seller charges reduce your cash.
- Put contingencies and timing in writing. If an assumption is part of the buyer’s plan, make the contract identify the required approval, deadlines, and what happens if the servicer declines it.
Common mistakes and how to avoid them
Mistake: treating “assumable” as “portable”
An assumption changes the borrower on the same property. It does not move your loan to the home you plan to buy. Use the servicer’s written answer, not a listing description or informal statement.
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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteMistake: assuming the buyer’s approval releases you
Require a separate, written release of liability. If there is no release, disclose the obligation to the next lender and understand how it will be counted.
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Mistake: planning to use gross equity as a down payment
Use the estimated settlement statement and documented net proceeds after payoff and selling costs. Fannie Mae’s anticipated-proceeds policy is one example of a lender requiring this evidence.
Mistake: ignoring the due-on-sale clause
Do not transfer title informally, add a buyer to ownership, or leave the old loan in place without confirming a permitted exception or approved assumption. A transfer can trigger the lender’s contractual rights.
Mistake: relying on one lender’s policy as universal
Fannie Mae guidance applies to loans and underwriting delivered under its rules. FHA, VA, USDA, portfolio, jumbo, and other loans can differ. Get program-specific answers from the lender handling your transaction.
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A practical decision worksheet
| Item | Your figure or answer |
|---|---|
| Expected sale price | Enter a supported price range, not a best-case listing number. |
| Mortgage payoff at closing | Use a current servicer quote. |
| Commissions, taxes, credits, and other sale costs | Obtain estimates from the agent and closing professional. |
| Estimated net cash proceeds | Sale price minus payoff and selling costs. |
| Replacement-home price and cash required | Include down payment, closing costs, reserves, and moving costs. |
| Replacement loan payment and total housing cost | Include taxes, insurance, and association dues. |
| Overlap treatment | Record the new lender’s written answer about both homes. |
| Assumption status | Permitted, prohibited, or not yet confirmed; include fees and release terms. |
Proceed only after the worksheet reflects documents and written lender answers. A low rate is one input; liquidity, qualification, timing, and legal responsibility can matter more.
Bottom line
For an ordinary sale, expect the existing mortgage to be paid off. You generally cannot carry its low rate to a different property unless your contract and servicer confirm a specific transfer right. A buyer’s assumption may preserve the loan on the home being sold, but it depends on the loan type and approval and does not automatically release you.
Make the decision with a payoff quote, a net-proceeds estimate, replacement-loan terms, an overlap-underwriting answer, and written assumption and release-of-liability terms. If any of those are unknown, the rate gap alone is not a safe basis for keeping or selling.
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