A belowmarket loan is a loan which provides for no interest or interest at a rate below the federal rate that applies. I'm wanting to add an interest component to a long term loan liability account.Interest Rates and Taxable Benefits:. 617.0833 Loans to directors or officers. The Interest Rates section identifies interest rates for the late payment of tax, and includes instructions on how to calculate interest due. Do companies need to charge interest if a director takes a loan? Interest rates are negotiated between the lender and borrower. Rates may be fixed or variable.