It depends on what state you are filing. Some states require a separate form, others include it as part of the tax return and still others don't require any filing because it is a local property tax adjustment.
We'd have to know what state issued the homestead tax credit.
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The Homestead Tax Credit (Amendment 79) is a credit on your real estate tax bill. That credit is not claimed on your state income tax forms. You will need to go to your county tax assessor web page and search for "Amendment 79" or "Homestead Tax credit" to find the procedures for claiming the credit on your real estate tax bill in your county.