‘Jumbo’ mortgages now cheaper than smaller loans Now there's a good reason to buy the big house! NEW YORK – July 1, 2016 – Banks will give you a better interest rate if you buy a more expensive and, presumably, bigger home. The interest rate on a 30-year jumbo loan currently stands at 3.71 percent – a notch below the rate for a "conforming" mortgage, which weighs in at 3.73 percent, says Greg...