Buydown Calculator

Explore savings on mortgage payments with our Buydown Calculator. It shows cash needed for reduced payments in WA, CA, OR, ID, and CO. Easy to use, it offers clear insights for homebuyers. Simply input your numbers and choose options to understand potential savings and upfront costs.

Buydown
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Payment breakdown
Amortization schedule
Payment breakdown

The total buydown fee for this loan is

See your lower monthly payment for the first years of the loan.

Select year:
/for year 1
Monthly Payment
Interest Rate
Monthly Savings
Principal and Interest
Taxes
HOA
Buydown Contribution
Insurance
Amortization schedule

Over years you'll pay and this is based on an estimated monthly payment of .

Your total principal payment is and your total interest payment is .

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Common Buydown Calculator Terms

A buydown calculator helps estimate how a reduced interest rate—either temporary or permanent—can lower your monthly mortgage payment. The terms below explain the key inputs used to calculate buydown savings and payment changes over time.

Buydown Type

Defines whether the interest rate reduction is temporary (such as a 2-1 or 1-0 buydown) or permanent. Temporary buydowns reduce payments for a limited period, while permanent buydowns lower the rate for the full loan term.

Buydown Period

The length of time the reduced interest rate applies. For temporary buydowns, this is usually one to three years before the loan adjusts to the standard rate.

Initial Interest Rate

The lowered interest rate applied at the start of the loan during the buydown period. This rate directly impacts the reduced monthly payment shown in the calculator.

Standard Interest Rate

The regular interest rate the loan will return to after the buydown period ends. This rate is used to calculate future monthly payments once the buydown expires.

Buydown Cost

The upfront amount paid at closing to fund the buydown. This cost may be paid by the borrower, seller, builder, or lender, depending on the loan structure.

Monthly Payment Adjustment

The difference between the reduced payment during the buydown period and the standard mortgage payment. The calculator uses this to show how payments change over time.

Total Buydown Savings

The estimated amount saved during the buydown period compared to making standard payments from day one.
Rate Quote Expected

Rate quote isn’t what you expected?

If your instant rate quote isn’t what you expected, we can provide counsel on how to potentially transform your quote into something more acceptable. Sammamish Mortgage is a family-owned mortgage company with over 30 years of experience in the industry. We proudly serve customers in the Pacific Northwest region. We serve WA, ID, OR, CO and CA. If you’re looking to buy a home in one of these states, we can help!

Our Reviews

Sania Marri
March 31, 2026
Very helpful and always willing to answer my questions
Darren Jones
March 29, 2026
The staff at Sammamish mortgage is a pleasure to work with. Nick and Barb were particularly pleasant. They were always available for questions, timely with responses and progress, and clear with expectations.
Leno Balderas
March 26, 2026
(Translated by Google) Excellent service. Very friendly, attentive, and reliable in every way. Cristina's service was outstanding, 5 stars; I highly recommend them. (Original) Excelente servicio. Muy amables, atentos y confiables en todos los aspectos. La atención por parte de Cristina, desde 5 estrellas, lo recomiendo mucho
Eva Schoenleitner
March 25, 2026
An excellent mortgage firm. I just did a refi after buying my latest townhouse with them as well 6 months ago. Both went without a hitch. Sammamish has competitive rates and they were able to get me approved where others had challenges. I can highly recommend.
J
March 12, 2026
Highly recommend checking out Sammamish Mortgage. Going with a local, well known, highly respected mortgage broker like Sammamish Mortgage has a number of benefits. Not only do you get just as good rates as any other big-box broker or bank, you get dedicated, hands-on, personable, responsive, and consistent service! I had gotten quotes from Rocket, Loan depot, and Quicken, but those big box just bounce you from one customer service agent to another, and did not provide any better loan rate! Also, I had a selling agent tell me that if a Seller is choosing between identical offers, they would select an offer that works with Sammamish vs big-box brokers. Even realtors are frustrated with not being able to contact loan agents and encounter slow response times. I'm sure everyone at Sammamish are great, but in case you want name drops. . .Ryan was fantastic providing different options and recommendations based on my situation, floating out ideas and concepts I hadn't even heard of (like recasting your loan!). Shawn was also great on the processing side and was ALWAYS responsive during the entire process. Oh, and one more thing. . .Unlike other big-box brokers who bait you with calculating an instant offer but require you to provide your phone number and email. . .Sammamish shows their LIVE rates on their website WITHOUT requiring you to share your phone and email- YOU WON"T GET SPAM like I did with other brokers. Loan Depot was the worst, calling me 3 x a day for 2 weeks. (just google Loan Depot reviews online and you'll see what I'm saying). Sorry for the ramble. . .I just can't say enough about Sammamish Mortgage!
Elsa Watland
March 9, 2026
Our second time working with Sammamish and can't recommend enough. Experience was smooth and professional.
Owen Johnson
March 5, 2026
Highly recommend Sammamish Mortgage. Christina and Shawn were amazing, provided immediate responses to our questions and stayed on top of our file the entire process. We had to jump through a hoop at the eleventh hour (our fault), but they helped us out big time and made sure we met our closing date. Sammamish also beat the rates of every other lender we quoted, specifically those of the large lenders / mortgage companies. Would absolutely recommend their services!

FAQs

What does “mortgage buydown” mean?

A mortgage buydown is a way to lower your interest rate by using upfront funds to reduce your monthly payment. The reduced rate can apply for a limited time at the start of the loan or for the entire loan term, depending on how the buydown is structured.

What does the buydown calculator actually calculate?

This calculator estimates how a reduced interest rate affects your monthly mortgage payment during a buydown period. It compares payments at the lowered rate with payments at the standard rate, helping you see how your payment changes over time.

Which buydown options can be estimated with this tool?

The calculator supports common temporary buydown structures, such as 1-0, 2-1, and 3-2-1 buydowns, where the interest rate gradually increases each year. It can also be used to estimate permanent buydowns when the interest rate remains reduced for the full loan term.

Why do buyers use a buydown instead of a lower-priced home?

Some buyers prefer a buydown because it reduces early monthly payments without changing the home price. This can be helpful when adjusting to new housing costs, planning for future income growth, or using seller or builder incentives strategically.

Does it matter who pays for the buydown?

Not for the calculation itself. The buydown cost may be paid by the buyer, seller, or builder, depending on the purchase agreement. The calculator focuses on how the reduced interest rate affects monthly payments, regardless of who covers the upfront cost.

Are taxes, insurance, and PMI included in the buydown results?

No. The buydown calculator is designed to show changes in principal and interest payments only. Property taxes, homeowners insurance, and mortgage insurance are not included and may vary based on location and loan type.

Can I rely on these numbers when making a financing decision?

The results are estimates meant for planning and comparison purposes. Actual loan terms, interest rates, and buydown costs can vary based on market conditions and borrower qualifications. A loan officer can provide precise figures and official loan disclosures.

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