CT Gen Stat § 12-419 (2020)
2020 Connecticut General Statutes|Title 12 - Taxation|Chapter 219 - Sales and Use Taxes|Section 12-419 - Interest and penalties.

 (a) Any person, other than an individual making purchases for personal use or consumption and not making purchases for use or consumption in carrying on a trade, occupation, business or profession, who fails to pay any tax to the state or any amount of tax required to be collected and paid to the state, except amounts of assessments made by the commissioner under sections 12-415 and 12-416, within the time required shall pay, in addition to such tax or such amount of tax required to be collected and paid, a penalty of fifteen per cent of the tax or fifty dollars, whichever amount is greater, plus interest on such tax or such amount of tax required to be collected and paid at the rate of one per cent per month or fraction thereof from the due date to the date of payment.(b) Any individual making purchases for personal use or consumption and not making purchases for use or consumption in carrying on a trade, occupation, business or profession who fails to pay use tax to the state, except amounts of assessments made by the commissioner under sections 12-415 and 12-416, within the time required shall pay, in addition to such tax, a penalty of ten per cent of the tax, plus interest on such tax at the rate of one per cent per month or fraction thereof from the due date of such tax to the date of payment.(c) Subject to the provisions of section 12-3a, the commissioner may waive all or any part of the penalties provided under this chapter when it is proven to the satisfaction of the commissioner that failure to pay any tax was due to reasonable cause and was not intentional or due to neglect.(1949 Rev., S. 2103; 1953, S. 1172d; 1969, P.A. 388, S. 13; P.A. 76-322, S. 14, 27; P.A. 80-307, S. 22, 31; P.A. 81-64, S. 11, 23; 81-411, S. 30, 42; P.A. 85-316, S. 4, 7; P.A. 90-148, S. 12, 34; May Sp. Sess. P.A. 94-4, S. 40, 85; P.A. 95-160, S. 64, 69; P.A. 97-243, S. 30, 67.)History: 1969 act increased interest rate from 0.5% to 0.75%; P.A. 76-322 increased interest rate to 1%; P.A. 80-307 temporarily increased interest rate to 1.25% for taxes due on or after July 1, 1980, but not later than June 30, 1981; P.A. 81-64 amended penalty provisions to provide for penalty of 10% of the tax or $50, whichever is greater in all cases where previously charge was 5% for first 15 days and 10% thereafter; P.A. 81-411 continued interest on the amount of tax not paid when due at 1.25% per month, effective July 1, 1981, and applicable to taxes becoming due on or after that date; P.A. 85-316 added provision authorizing commissioner to waive penalties in specified cases; P.A. 90-148 increased the rate of penalty from 10% to 15% of the tax and increased the rate of interest added from 1.25% to 1.66% per month, effective July 1, 1990, and applicable to taxes becoming due on or after that date; May Sp. Sess. P.A. 94-4 in Subsec. (b) reduced interest rate from 1.66% to 1%, effective July 1, 1995, and applicable to taxes due and owing on or after said date; P.A. 95-160 revised effective date of May Sp. Sess. P.A. 94-4 but without affecting this section; P.A. 97-243 divided section into Subsecs. (a) to (c), reduced the penalty for late payment by individuals making purchase for their own personal use or consumption and made technical changes, effective June 24, 1997, and applicable to sales occurring on or after January 1, 1997.Cited. 44 CS 297.