This is a plan to reduce the debt by making half-payments every two weeks (instead of the standard monthly payment schedule).  The 26 (or possibly 27) biweekly payments are each equal to one-half of the monthly payment required if the loan were a standard 30-year fixed-rate mortgage. The result for the borrower is a large savings in interest.  Not all lenders allow this, but you should check to see if your lender does have the bi-weekly program.