Since a mortgage rate buydown is a one-time cost paid at closing, your estimate weighs the price you enter against roughly three months of your budget rather than a single month's income, since that's closer to how a lump-sum cost like this actually gets absorbed.
These key factors affect mortgage rate buydown affordability
How points translate to rate reduction
One discount point typically costs 1% of your loan amount and lowers your interest rate by roughly 0.25 percentage points, though the exact ratio shifts with market conditions and lender pricing. On a $400,000 loan, one point runs about $4,000 and might take an interest rate from 7% to 6.75% - a trade that only pays off if you keep the loan long enough to recoup that upfront cost through lower monthly payments.
Your breakeven timeline
Divide the buydown cost by your monthly savings to find the breakeven month; if that $4,000 point saves you $65 a month, you need about 62 months (just over 5 years) in the home before the buydown pays for itself. Anyone planning to sell or refinance before that breakeven point effectively loses money on the buydown, which is why lenders and financial advisors flag it as a bad fit for buyers who expect to move within a few years.
Permanent vs. temporary buydowns
A permanent buydown lowers your rate for the full loan term, while a temporary buydown (like a 2-1 buydown) only reduces payments for the first year or two before stepping back up to the note rate - and sellers or builders sometimes fund temporary buydowns as an incentive rather than the buyer paying out of pocket. Confusing the two can lead to payment shock once the temporary discount expires, so it matters which structure you're actually pricing out.
How to use your results
- Compare the buydown cost against what you'd pay in extra interest without it over your expected time in the home.
- Ask your lender for the exact rate reduction per point since it varies by loan program and market pricing.
- Factor in whether a seller or builder credit could cover some or all of the buydown cost instead of your own cash.
Ways to make a mortgage rate buydown more affordable
- Negotiate a seller or builder credit at closing to cover part or all of the points instead of paying cash.
- Buy fewer points and put the difference toward a larger down payment, which also lowers your rate and your loan balance.
- Shop multiple lenders since the rate reduction per point can vary meaningfully between them.
- Skip the buydown if you expect to sell or refinance within the breakeven window and bank the cash instead.
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