Modifies the senior citizens property tax relief credit

HB 1566 modifies Missouri's property tax relief credit for senior citizens and certain disabled veterans. It primarily affects Missouri residents aged 65+ (or 60+ with surviving spouse Social Security benefits), disabled veterans (100% service-connected), or those with qualifying disabilities, who own or rent their primary home ("homestead"). Key changes include requiring proof of age/residency, adjusting income calculations to exclude certain benefits (like Social Security for disabled veterans), and clarifying that property taxes must be paid before filing. The bill also expands eligibility for surviving spouses and those who die before year-end while meeting other criteria.