R.I. Gen. Laws § 1-6-8: Regulations.

The tax administrator may prescribe rules and regulations, not inconsistent with law, to carry into effect the provisions of this section, which rules and regulations, when reasonably designed to carry out the intent and purpose of this section, are prima facie evidence of their proper interpretation. Those rules and regulations may from time to time be amended, suspended, or revoked, in whole or in part, by the tax administrator. The tax administrator may prescribe, and may furnish, any forms necessary or proper for the administration of this chapter.