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The instructions are published on page 21 of https://revenue.ky.gov/Forms/2019%20740(P)%20Instructions%20only_FINAL_rev%[social security number r...
About your case:
> adjusted gross income is $28,000 and family size is 1
> If my tax amount is 1472 on line19. My family size is 1..is that 40% as well?.
Use your adjusted gross income ($28,000) and family size to look up the percent in the "Family Size Table" :page 2 of https://revenue.ky.gov/Forms/Schedule%20ITC%20-2019.2.pdf
Your percentage is 0%, and your Income Gap Credit is $0
