Modifies provisions relating to tax credits for sporting events

HB 501 creates a tax credit program for Missouri taxpayers who donate to certified sponsors (nonprofits in the Sports Events and Tourism Association) to fund sporting events hosted in the state. Taxpayers can receive a refundable credit equal to 100% of eligible costs - like event preparation, staff, and facility retrofitting - but not construction or payments to for-profit site selectors. The credit is calculated based on actual ticket sales or participant registrations verified after the event, and applicants must submit documentation to the Missouri Department of Economic Development for certification. This directly affects certified sponsors, taxpayers making qualifying donations, and sporting events selected by organizations like the NCAA or USOPC.