Why won't CT return give me my $300 credit for the taxes I paid on my home. It has given it to me on other people's returns. Is there an income level limit?

Are you filing a CT Resident Return?    How much is your CT Adjusted gross income?  

Residents only can claim a credit of up to $300 per return for property tax paid in 2023 to a Connecticut political subdivision on a primary residence or privately owned or leased motor vehicle, or both.  For a leased vehicle, there must be a written lease agreement for a term of more than one year.   The credit is reduced by the percentage from the Property Tax Credit Table, based on Connecticut AGI.