Late payment and default interest. (a) Late payment and default interest on all amounts due and unpaid (except for interest) If the Borrower fails to pay any amount payable by it to the Lender under this Agreement (whether a payment of principal, a Prepayment Indemnity, any fees or incidental expenses of any kind except for any unpaid overdue interest) on its due date, interest shall accrue on the overdue amount, to the extent permitted by law from the due date up to the date of actual payment (both before and after an arbitral award, if any) at the Interest Rate applicable to the current Interest Period (default interest) increased by three point five percent (3.5%) (late-payment interest). No formal prior notice from the Lender shall be necessary.