R.I. Gen. Laws § 1-6-4

The administrator may require the filing of periodic reports, not more frequently than monthly, setting out any information that the tax administrator may require. The surcharge for the transient parking shown or which should be shown on the report shall be due with the report; provided, that if an operator will operate a transient parking facility for a period of less than one month, the administrator may require the filing of reports more frequently than monthly. The ordinance may authorize the tax administrator for good cause to extend the time for making any return or paying any amount required to be paid. Any person to whom an extension is granted shall pay, in addition to the surcharge, interest at the annual rate prescribed by § 44-5-9, or fraction of it, from the date on which the surcharge would have been due without the extension until the date of payment.