What Is an Assumable Mortgage and How Does It Work?
An assumable mortgage is an existing home loan that a buyer can take over from the seller, keeping the original interest rate, remaining balance, and loan terms. That's it. That's the whole concept.
But here's why it matters right now: millions of homeowners locked in mortgage rates between 2% and 4% during 2020-2022. Today's rates are sitting around 7%. If you can assume one of those older loans, you're saving hundreds of dollars every single month.
Let me put real numbers on this. A $400,000 mortgage at 7% costs $2,661 per month in principal and interest. That same $400,000 at 2.5% costs $1,580 per month. That's $1,081 less every month. Over 25 years, that's $324,300 in savings.
Read that again. Over three hundred thousand dollars.
Which Loans Are Assumable?
Not every mortgage can be assumed. Here's the breakdown:
FHA loans: Assumable. These are insured by the Federal Housing Administration. The buyer needs to qualify with the lender, but the rate transfers.
VA loans: Assumable. These are backed by the Department of Veterans Affairs. And yes, non-veterans can assume VA loans. More on that in my VA assumptions guide.
USDA loans: Assumable. Less common, but they work the same way.
Conventional loans: Generally not assumable. Most have a due-on-sale clause that lets the lender call the loan when the property transfers. There are rare exceptions, but don't count on it.
The vast majority of assumable inventory comes from VA and FHA loans. In Colorado alone, I'm tracking over 1,100 assumable properties right now.
How the Process Actually Works
Here's the step-by-step:
Step 1: Find an assumable property. This is harder than it sounds because most MLS listings don't flag whether a loan is assumable. That's part of what I do. I've built a database of every assumable property in Colorado, and you can search it right here.
Step 2: Make an offer. Your offer will include language about assuming the existing mortgage. The seller needs to agree to allow the assumption.
Step 3: Apply with the lender. You're not getting a new loan. You're applying to take over the existing one. The lender (whoever services the seller's mortgage) will review your credit, income, and financials just like they would for a new loan.
Step 4: Cover the equity gap. This is the tricky part. If the home sells for $400,000 but the remaining loan balance is only $300,000, you need to come up with that $100,000 difference. You can use cash, a second mortgage, or a combination. I explain this in detail in my equity gap guide.
Step 5: Close. Once the lender approves the assumption, you close on the property. The mortgage transfers to your name at the original rate and terms.
The whole process typically takes 45 to 90 days, though it can stretch longer depending on the lender. Working with an assumption processor like assumption processors helps keep things on track.
Why Aren't More People Doing This?
Three reasons.
First, most buyers don't know assumable mortgages exist. It's not taught in any homebuyer course. Most real estate agents have never done one. The information just isn't out there.
Second, the process is different enough from a traditional purchase that it scares people off. Different timelines, different paperwork, different players. If you don't have someone guiding you who's done it before, it feels overwhelming.
Third, lenders don't make it easy. The servicer handling the existing loan has no financial incentive to help you assume it. They'd rather you get a new loan at 7% (more interest for them). So the process can feel like pulling teeth.
That's why working with someone who specializes in assumptions matters. I've spent years learning every angle of this process specifically because the savings are too significant to ignore.
The Equity Gap: The One Catch
The biggest hurdle in most assumptions is the equity gap. Since you're taking over the remaining loan balance (not the full home price), you need to cover the difference.
Example: Home price is $450,000. Remaining loan balance is $320,000. Your equity gap is $130,000.
Options for covering it:
- Cash (if you have it)
- A second mortgage (several lenders now specialize in these for assumptions)
- Seller financing (less common, but possible)
- A blended approach
The equity gap doesn't eliminate the savings. Even with a second mortgage at a higher rate, your blended rate is usually still well below market. I run these numbers for clients all the time using our savings calculator.
Is It Worth It?
Yes. Almost always yes.
The math is just too compelling. Even in scenarios where the equity gap is large and you need a second mortgage, the blended rate typically comes in 1.5 to 3 percentage points below current market rates. That's real money every single month for 20+ years.
The process takes patience. It takes someone who knows what they're doing. But the payoff is a mortgage rate that most buyers today can only dream about.
If you want to see what's available, browse the current Colorado listings. Or use the calculator to see what you'd save on a specific price point. The numbers tell the story better than I ever could.
Ready to Find an Assumable Mortgage in Colorado?
Browse available listings or schedule a free call with Ryan Thomson, Colorado's leading assumable mortgage specialist.
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Frequently Asked Questions
What is an assumable mortgage?
An assumable mortgage is an existing home loan that a buyer takes over from the seller, keeping the original interest rate, remaining balance, and loan terms. FHA, VA, and USDA loans are assumable. Conventional loans generally are not.
Which loans are assumable?
FHA loans, VA loans, and USDA loans are assumable. These three loan types make up a significant portion of mortgages originated from 2019-2022, when rates were at historic lows. Conventional loans (Fannie Mae/Freddie Mac) generally have due-on-sale clauses that prevent assumption.
How much can I save with an assumable mortgage?
On a $400,000 loan at 3% vs. 7%, you save $1,081 per month in principal and interest. Over 10 years, that's $129,720. Over the life of the loan, the savings exceed $300,000.
How long does the assumption process take?
Most assumptions close in 45-90 days. The timeline depends on the loan servicer. Having your financial documents ready and working with an experienced assumption specialist helps keep things moving.
What is the equity gap and how do I handle it?
The equity gap is the difference between the home's sale price and the existing loan balance. You cover it with cash, a second mortgage, or both. Even with a second mortgage at today's rates, the blended payment often beats a new conventional loan on the same property.
How do I find homes with assumable mortgages?
Most MLS listings don't flag assumable loans. You need to work with a specialist or use a service that tracks FHA and VA loan inventory. Browse assumable homes in Colorado to see current listings with confirmed assumable mortgages.