Is a buydown a good option on a new build with a $30,000 incentive structured as 2.99%/3.99%/4.99% over three years?

Landing at a permanent 4.99% through a builder-funded buydown is a strong outcome, and the escalating steps don't add real downside. One thing to keep straight first: a builder incentive is given in lieu of a lower price, so the $30,000 is your money, moved around. The steps (2.99% the first year, 3.99% the second, then 4.99% permanently from year three on) simply spread that subsidy across your early payments. What matters is where you land for good, and a permanent rate near 4.99% funded by the builder is worth taking seriously. Our usual preference is a straight price reduction, or an equivalent lower permanent rate, over a built-in escalator, so ask for that trade first. Builders rarely agree, because a visible price cut lowers the comparable sales on their remaining units while a financing incentive doesn't, but the ask costs you nothing. Two more points. If rates fall and you refinance before the buydown funds are used up, the leftover balance can typically be applied to reduce your principal, so those dollars aren't wasted. And nobody can promise rates drop, so judge the deal on the permanent rate and the payment you'd carry from year three on. If both work for your budget, this is a solid incentive.