(1) The original acquisition of a facility by the holder of a certificate shall be exempt from sales tax imposed by chapter 82.08 RCW and use tax imposed by chapter 82.12 RCW when the due date for payment of such taxes is subsequent to the effective date of the certificate: PROVIDED, That the exemption of this section shall not apply to servicing, maintenance, repairs, and replacement of parts after a facility is complete and placed in operation. Sales and use taxes paid by a holder of a certificate with respect to expenditures incurred for acquisition of a facility prior to the issuance of a certificate covering such facility may be claimed as a tax credit as provided in subsection (2) of this section.

(2) Subsequent to July 30, 1967 the holder of the certificate may, in lieu of accepting the tax exemption provided for in this section, elect to take a tax credit in the total amount of the exemption for the facility covered by such certificate against any future taxes to be paid pursuant to chapters 82.04, 82.12 and 82.16 RCW.

Effective date—1975 1st ex.s. c 158: "The provisions of this amendatory act shall be applicable with respect to applications for a pollution control tax exemption and credit certificate made to the department of revenue on or after January 1, 1975." [ 1975 1st ex.s. c 158 s 5.]