Revenue and taxation; sales tax exemptions; nonprofit entities; public safety functions; effective date; emergency.

HB 4197 amends Oklahoma's sales tax exemption rules to expand exemptions for certain public safety and infrastructure-related purchases. It specifically adds a new exemption (under Section 1356(10)) for sales of tangible personal property or services to named state agencies (like the Oklahoma Department of Veterans Affairs) and public contractors when purchasing for public construction projects. The bill requires vendors to obtain written certification from buyers confirming purchases are made on behalf of these agencies to prevent misuse. This change directly affects state agencies, public contractors, and vendors supplying goods/services for public construction projects, clarifying which purchases qualify for tax exemption.