(1) In computing tax there may be deducted from the measure of tax amounts received by a nonprofit organization from the United States or any instrumentality thereof, the state of Washington or any municipal corporation or political subdivision thereof, or an Indian tribe as defined in RCW
43.06.523, as salmon recovery grants.
(2) For the purposes of this section, the following definitions apply:
(a) "Nonprofit organization" has the same meaning as in RCW
82.04.3651.
(b) "Salmon recovery grant" means, solely for the purposes of this section, financial assistance provided to primarily benefit the public as a whole by renewing, restoring, or protecting, by human intervention, salmon ecosystems or salmon habitats in this state, whether or not such financial assistance furthers the regulatory activities of the grantor.