The interest rate on a purchase money note is negotiable, as are the other terms in a seller-financed transaction. To get an idea about what to charge, sellers can check with a lender or mortgage broker to determine current mortgage rates on loans, including second mortgages. Most interest rates, however, are generally influenced by current Treasury bill and certificate of deposit rates.
Because sellers, unlike conventional lenders, do not charge loan fees or points, seller-financed costs are generally less than those associated with conventional home loans.
Understandably, most sellers are not open to making a loan for a lower return than could be invested at a more profitable rate of return elsewhere. So the interest rates they charge may be higher than those on conventional loans, and the length of the loan shorter, anywhere from five to 15 years.