You should apply for homestead as soon as possible after you purchase and move into your home.
If you purchase and occupy by December 31 of any year, and make application by December 31, the following year's property tax will reflect the homestead rates.
You can file for homestead in person at the Clay County Assessor's Office or you can go to the forms / applications webpage to print a form and file via mail (please do not email due to confidential content on the application).
You file for homestead once, unless a form is mailed to you by the Assessor. If you receive an application, it is very important that you complete it and return it to the address on the form.
Contact the Clay County Assessor's Office for further homestead information by calling 218-299-5017.