Modifies the senior citizens property tax relief credit

HB 1483 modifies Missouri's senior citizens property tax relief credit by updating eligibility rules and definitions. It requires claimants to be age 65 or older (or meet specific disability/veteran criteria) by year-end, clarifies that disabled individuals must be unable to work for 12+ months due to medical conditions, and adds proof requirements for surviving spouse Social Security benefits. The bill adjusts how "income" is calculated for the credit, including specific inclusions (like pensions) and exclusions (like certain government benefits). These changes affect Missouri seniors, disabled residents, and veterans seeking property tax relief on their primary homes.