R.I. Gen. Laws § 23-63-4.7: Notice of determination.

The tax administrator shall give written notice of his or her determination to the retailer. Except in the case of fraud or failure to make a return, or noncompliance with § 23-63-4.5, every notice of determination shall be mailed within three (3) years of the date the fees first became due. The amount of this determination shall bear interest at the rate set forth in § 44-1-7 from the date when fees should have been paid to the tax administrator until the date of payment.