Why assumptions came back
For most of the last decade, loan assumption was a footnote. Rates were low, new debt was cheap, and inheriting a seller's mortgage offered nothing worth the paperwork.
That flipped when rates rose. A property financed in 2020 or 2021 may carry a fixed rate in the 3% to 4% range with several years left on the term, while a new loan on the same building today prices several points higher. That old note is now an asset in its own right, and buyers will pay for it, either in price or in a harder equity check.
Not every loan can be assumed. Most commercial mortgages contain a due-on-sale clause that lets the lender call the balance if the property changes hands, so assumption is only possible where the documents expressly allow it. In practice, the loans most likely to be assumable are agency multifamily loans from Fannie Mae and Freddie Mac, CMBS conduit loans, and many life company loans. Bank loans are assumable far less often, and when they are, the bank has wide discretion to say no.
How the process actually runs
Assumption is an underwriting event, not a transfer of paperwork. The lender or servicer reviews the buyer roughly the way it would review a new borrower: net worth and liquidity, real estate experience, credit, the ownership structure, the property's current performance, and who will sign the carve-out guaranty. On a securitized loan, the file may also need servicer and rating agency review.
Costs typically include an assumption fee, commonly quoted in the range of 0.5% to 1.0% of the loan balance, plus lender legal fees, third-party reports, and title and recording costs. Timelines usually run 45 to 90 days on agency and conduit loans, longer if the file is complicated.
One detail sellers should not skip: ask for a release of liability. An assumption without a written release can leave the seller and the original guarantor still on the hook for the debt they thought they had sold.
Worked example
A multi-tenant industrial building is under contract at $6,400,000. The seller's loan has a $3,600,000 balance at 4.15% fixed with six years remaining. A new loan today would be quoted around 6.75% at 65% loan-to-value.
- Assume the loan — debt of $3,600,000, cash required $2,800,000
- New loan at 65% LTV — debt of $4,160,000, cash required $2,240,000
- Extra cash the assumption demands — $560,000
Now price the benefit. Interest on $3,600,000 at 4.15% runs about $149,400 a year. The same balance at 6.75% would run about $243,000. The assumption saves roughly $93,600 a year, or about $562,000 across the six remaining years, before amortization effects.
Notice how close those two numbers are. The assumption saves roughly $562,000 of interest and costs roughly $560,000 of additional equity, plus an assumption fee of about $18,000 to $36,000 at 0.5% to 1.0%. On a pure dollar basis it is close to a wash, and whether it is a good trade depends on what else that $560,000 could earn, how long you plan to hold, and what happens at the loan's maturity in year six. A buyer who plans to sell in year five gets most of the benefit. A buyer who is capital constrained is usually better off with the new loan and the higher rate.
Closing the equity gap
The gap in that example is the central problem with assumptions. You inherit a smaller loan than today's market would give you, so you bring more cash. The realistic ways to bridge it:
- Supplemental financing. Fannie Mae and Freddie Mac allow supplemental loans behind an existing agency first mortgage, subject to seasoning, combined leverage, and coverage tests. This is the cleanest path when it is available.
- Approved subordinate debt. Mezzanine debt or a second mortgage, but only where the loan documents permit it and the lender consents. Doing it without consent is a classic bad boy carve-out trigger that can convert a non-recourse loan to full recourse.
- Preferred equity. Often more acceptable to lenders than subordinate debt because it sits in the ownership structure rather than as a lien, though the documents still usually require consent above a threshold.
- Seller carryback. Sometimes workable, frequently prohibited outright in CMBS and agency documents. Never assume it is allowed.
- Price negotiation. If the below-market loan is worth $500,000 to the buyer, that value is negotiable in the purchase price. Sellers with a genuinely low-rate assumable loan should be marketing it as part of the asset.
What it means for you
If you are buying, ask about the existing loan in your first conversation with the broker, before you write an offer. The rate, remaining term, prepayment provisions, and whether it is assumable all change what the property is worth to you. If you are selling, pull your loan documents early: an assumable low-rate loan can widen your buyer pool, while a loan with yield maintenance or defeasance and no assumption right can quietly cost you real money at closing.
Either way, build the timeline into the contract. Assumption approvals do not fit a 30-day escrow. We work these files alongside straight commercial refinancing and new acquisition debt, and the right answer is usually clear once both are priced against each other. Send us the existing note and rent roll through our commercial loan application and we will model the assumption against a new loan on the same property.
What to watch for
- Confirm the loan is actually assumable, in writing. "Assumable" in a listing is a marketing claim. The right of assumption, and whether the lender may withhold consent at its discretion, lives in the loan agreement.
- Get the seller released. Sellers should insist on a written release of liability, including the original carve-out guarantor. Without it, you can sell a building and keep the guaranty.
- The maturity date comes with the loan. Inheriting a 4.15% rate with two years left mostly means inheriting a refinancing problem in two years. Assumptions are most valuable when meaningful term remains.
- Escrows and reserves transfer on the lender's terms. Existing tax, insurance, and replacement reserve balances are typically credited between the parties at closing. Confirm who gets them before you price the deal.
- An assumption denial can kill a contract late. Tie your financing contingency to lender approval of the assumption specifically, with a realistic outside date, not to "financing" generally.
Are commercial mortgages assumable?
Some are. Fannie Mae and Freddie Mac multifamily loans, CMBS conduit loans, and many life company loans commonly permit assumption with lender approval and a fee. Most bank and credit union loans contain a due-on-sale clause with no assumption right, though a bank may still consent case by case. The loan agreement controls, so read it rather than relying on the loan type.
How much does a loan assumption cost?
The assumption fee is commonly quoted in the range of 0.5% to 1.0% of the outstanding balance, which on a $3,600,000 loan is roughly $18,000 to $36,000. On top of that, expect lender legal fees, processing and servicer fees, updated third-party reports, and title and recording costs. Ask the servicer for a written estimate before you go under contract.
How long does a commercial loan assumption take?
Typically 45 to 90 days from a complete application, and longer if the loan is securitized and needs servicer or rating agency sign-off. The most common delay is the buyer's financial package arriving late. Build the timeline into the purchase agreement and start assembling the buyer's documents before the contract is signed.
