What state are you asking about? Lately we are getting lots of questions about MN. You can go to the MN website and prepare your property tax credit or you can print the form and mail it in. (You were supposed to prepare it when you prepared your MN state return, and then print it and mail it)
https://www.revenue.state.mn.us/homeowners-homestead-credit-refund
https://www.revenue.state.mn.us/renters-property-tax-refund
To check the status of the rent credit in MN
http://www.revenue.state.mn.us/individuals/individ_income/pages/draft-wmr-context-page.aspx
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