Connecticut General Statutes Title 12. Taxation § 12-416. Assessments if no return made

(a) Assessment;  failure to file return.  If any person fails to make a return, the commissioner shall make an estimate of the amount of the gross receipts of the person or, as the case may be, of the amount of the total sales price of services or tangible personal property sold or purchased by the person, the storage, acceptance, consumption or other use of which in this state is subject to the use tax.  The estimate shall be made for the period or periods in respect to which the person failed to make a return and shall be based upon any information which is in or may come into the commissioner's possession.  To the tax imposed upon the basis of such estimate, there shall be added an amount equal to fifteen per cent of such tax, or fifty dollars, whichever is greater.  No person shall be subject to a penalty under both this section and section 12-419.  Except in the case of new information that may come into the commissioner's possession, the commissioner may not make more than one assessment for a tax period for which a tax return has not been filed.

(b) Interest.  The amount of the assessment shall bear interest at the rate of one per cent per month or fraction thereof from the last day of the month succeeding the period for which the amount or any portion thereof should have been returned until the date of payment.

(c) Notice of assessment.  Promptly after making the assessment the commissioner shall give to the person written notice of the estimate, assessment and penalty, the notice to be served personally or by mail in the manner prescribed for service of notice of a deficiency assessment.