The tax collector's final report and settlement with the auditor of public accounts and with the clerk of the board of supervisors for the taxes of any fiscal year shall be made on or within fifteen (15) days after the first day of November next thereafter. If the tax collector fails to make any report, or to pay over any taxes as above required, he shall pay damages of thirty per centum (30%) thereon, and interest on said amount of principal and damages at the rate of six per centum (6%) per annum for the time the same shall be due until paid. The auditor and clerk shall not omit in any case to charge the damages to the collector when incurred, but the same shall be remitted on the certificate of the governor and attorney general that they are satisfied that the delay has not been wilful or was not due to inexcusable neglect by the collector.