Assumable Mortgages & Rate Buydowns: Getting a Lower Rate in Today's Market

Almost every buyer conversation I have these days circles back to the same worry: the interest rate. And I get it — rates shape your monthly payment as much as the price does. But here's what most people don't realize: the rate you see advertised isn't the only rate available to you. There are a couple of clever, under-the-radar strategies that can get you a meaningfully lower rate — and hardly anyone talks about them.

Let's dig into two of my favorites: assumable mortgages and rate buydowns. Neither is magic, and neither fits every situation. But in the right situation, they can save you real money.

Assumable Mortgages: Inheriting Someone Else's Low Rate

Here's the idea that makes people's eyes light up. A lot of homeowners locked in mortgages at 2–4% back when rates were at historic lows. An assumable mortgage lets a qualified buyer essentially take over that existing loan — same balance, same low rate, same remaining term. You're stepping into the seller's shoes.

Imagine buying a home and inheriting a 3% mortgage in a market where new loans cost significantly more. On a San Diego-sized loan, that difference can be hundreds of dollars a month. Sounds amazing, right? It can be — but there's important fine print.

Which loans are assumable?

Generally, only government-backed loans are assumable: FHA, VA, and USDA. Conventional loans usually are not. So this strategy only comes into play when a seller happens to have one of those loans with an attractive rate.

The catch: the equity gap

This is the part that trips people up, and it's a big deal in a high-value market like ours. When you assume a loan, you take over the seller's remaining balance — but you still have to pay the seller for their equity (the difference between the sale price and that balance). In San Diego, where homes have appreciated a lot, that gap is often large. You'd need to cover it with cash or a second loan, and that second loan would be at today's rates.

A few more things to know

• You still have to qualify. The lender/servicer approves you just like any borrower.
• The process can be slow. Loan servicers aren't always fast with assumptions — patience required.
• VA loans have an entitlement wrinkle. For veteran sellers especially, a VA assumption can tie up their entitlement unless handled carefully. Worth expert guidance.

Rate Buydowns: Paying Now to Lower the Rate

The second strategy is more widely available, and honestly it's one of the most useful tools in today's market. A rate buydown means paying an upfront cost to reduce your interest rate — either for a few years or for the life of the loan.

Temporary buydowns (like a "2-1 buydown")

With a temporary buydown, your rate starts lower and steps up to the full rate over the first couple of years. A "2-1" buydown, for example, knocks your rate down by 2% the first year and 1% the second, before settling at the note rate in year three. It's a gentle on-ramp — great if you expect your income to grow or plan to refinance if rates fall.

Permanent buydowns (paying points)

Here you pay "points" upfront to permanently lower your rate for the entire loan. The question is always whether you'll stay in the home long enough for the monthly savings to outweigh the upfront cost — the "break-even." If you're planting roots, it often pays off.

The best part: someone else can pay for it

In a market where homes can sit a little longer, many sellers will offer a concession — money toward your closing costs or a buydown — instead of dropping the price. Funny enough, a seller-paid buydown can help you more than an equivalent price cut, because it attacks your monthly payment directly. Negotiating this is one of the most valuable things a good agent does for you.

My Honest Take

These strategies aren't loopholes or gimmicks — they're legitimate tools that the buyers with great agents and lenders quietly use to win. The key is knowing when each one actually pencils out, because the wrong situation can make them a waste of money. That's where running the real numbers together matters.

If you want to understand how rates fit into your bigger affordability picture, pair this with my post on how interest rates affect your San Diego home purchase and how much income you need to buy here. And when you're ready to look at specific homes and financing, I'll bring a lender into the conversation so we can compare your options side by side.

Rates, loan rules, and program specifics change often — so treat the examples above as illustrations and let's confirm the current details for your situation.