P.R. Laws tit. 21, § 651r
Except as provided in § 651s of this title:
(a) General rule.— The amount of license taxes levied by authority of §§ 651–652y of this title shall be assessed within four (4) years after the declaration has been submitted and no proceeding in court without assessment for the collection of said license taxes shall be commenced after the expiration of said period.
(b) Omission of volume of business.— If the person should omit from his volume of business an amount properly includable therein which exceeds twenty-five percent (25%) of the amount of volume of business declared in the return, the tax may be assessed, or a proceeding in the court without assessment for the collection of said tax may be commenced at any time within six (6) years after the return has been submitted.
History —July 10, 1974, No. 113, Part 1, p. 371, § 19.