A temporary buydown initially offers a lower interest rate and lower monthly payments. In order to reduce monthly payments during the first years, borrowers make an initial lump sum payment or agree to a higher interest rate. Over the years, the interest rate gradually increases until it peaks at a fixed rate. Borrowers who chose this loan often expect a significant increase in their income.
Many builders offer this option to pay for a buyer's rate reduction rather than reducing the purchase price (or the option of either).