R.I. Gen. Laws § 44-23-39
At any time before the expiration of eighteen (18) months after the appointment in any probate court of this state of an executor of the will, or administrator of the estate of, any nonresident decedent, the executor or administrator shall file with the probate court proof that all death taxes, together with interest, or penalties attached to or in connection with the death taxes, which are due to the state of domicile of the decedent, or to any of its political subdivisions, have been paid or secured, or that no taxes, interest, or penalties are due, as the case may be; provided, that the filing of the proof is not required if it appears that letters testamentary have been issued in the state of domicile. The proof may be in the form of a certificate issued by the official or body charged with the administration of the death tax laws of the state of domicile.
R.I. Gen. Laws § 44-23-39