R.I. Gen. Laws § 44-15-5: Filing of return and reports — Determination and collection of tax — Interest on delinquencies.

(a) Each banking institution or credit union, on or before June 15 in each year, shall file a return with the tax administrator in the form and containing the information as he or she shall prescribe, and shall at the same time pay the tax imposed under this chapter.

(b) Upon the filing of the return, the tax administrator shall examine it and determine whether the correct amount of tax has been paid and shall assess and collect any additional tax found to be due.

(c) Any tax not paid when due shall bear interest at the annual rate provided by § 44-1-7 until paid.

(d) Each banking institution, or credit union, on or before January 15 following the close of the taxable year, shall file a report with the tax administrator in the form and containing the information as the tax administrator shall prescribe.