The borrower must pay, when due, all real and personal property taxes that may affect CCC's security interest in all collateral or land securing the note evidencing the loan. To protect its interests, CCC may pay any unpaid taxes with respect to the collateral or land securing a loan made in accordance with this part, and if CCC does so, the borrower will reimburse CCC for such payment, and if unpaid by the borrower, such debt will become due immediately.