P.R. Laws tit. 21, § 651z
If the term for payment of any portion of a deficiency should be extended, there shall be charged, as part of the license tax, interest on the portion of the deficiency the payment date of which was so extended at the annual rate of ten percent (10%) for the extension period, and no other interest on said portion of the deficiency shall be charged for said term. If the portion of the deficiency the payment date of which so extended should not be paid according to the terms of the extension, there shall be charged, as part of the tax, interest on said unpaid amount at the annual rate of ten percent (10%) for the period from the date fixed by the terms of the extension for its payment until the same is paid, and no other interest shall be charged on said unpaid amount for said term.
History —July 10, 1974, No. 113, Part 1, p. 371, § 27.