Modifies the "circuit breaker" tax credit by increasing the maximum upper limit and property tax credit amounts

HB 518 increases the maximum credit amount and upper income limit for Missouri's "circuit breaker" property tax credit program. This change directly affects eligible Missouri residents who own or rent a home, including seniors (age 65+), disabled individuals, veterans with 100% service-related disabilities, and surviving spouses receiving Social Security benefits. The bill modifies the credit calculation by raising the cap on the maximum annual credit amount and expanding the income threshold for qualification. It also updates eligibility definitions for "disabled" status and clarifies requirements for claiming the credit on combined tax returns. The policy change aims to provide greater tax relief for qualifying homeowners and renters facing high property tax burdens.