(a) If any motor carrier fails to pay tax reported to be due on its report within the time specified under the provisions of this chapter, there shall be imposed a penalty of ten per cent of such amount of tax due and unpaid, or fifty dollars, whichever is greater. The tax shall bear interest at the rate of one per cent per month or fraction thereof, from the due date of such tax until the date of payment. If no return has been filed within one month after the time specified under the provisions of this chapter, the commissioner may make such return at any time thereafter, according to the best information obtainable and the form prescribed. There shall be added to the tax imposed upon the basis of such return, an amount equal to ten per cent of such tax, or fifty dollars, whichever is greater. The tax shall bear interest at the rate of one per cent per month or fraction thereof, from the due date of such tax to the date of payment. Subject to the provisions of § 12-3a, the commissioner may waive all or part of the penalties provided under this chapter when it is proven to his satisfaction that the failure to pay any tax was due to reasonable cause and was not intentional or due to neglect.

(b) The amount of any tax, penalty or interest due and unpaid under the provisions of this chapter may be collected under the provisions of § 12-35. The warrant therein provided for shall be signed by the commissioner or his authorized agent. The amount of any such tax, penalty and interest shall be a lien, from the last day of the calendar quarter next preceding the due date of such tax until discharged by payment, against all real estate of the taxpayer within the state, and a certificate of such lien signed by the commissioner may be filed for record in the office of the clerk of any town in which such real estate is situated, provided no such lien shall be effective as against any bona fide purchaser or qualified encumbrancer of any interest in any such property. When any tax with respect to which a lien has been recorded under the provisions of this section has been satisfied, the commissioner, upon request of any interested party, shall issue a certificate discharging such lien, which certificate shall be recorded in the same office in which the lien is recorded. Any action for the foreclosure of such lien shall be brought by the Attorney General in the name of the state in the superior court for the judicial district in which the property subject to such lien is situated, or, if such property is located in two or more judicial districts, in the superior court for any one such judicial district, and the court may limit the time for redemption or order the sale of such property or make such other or further decree as it judges equitable.