To fill out the one-time Homestead Tax Credit Application (principal residence assessment cap). Maryland requires all homeowners to submit a onetime application to establish eligibility for the Homestead Tax Credit.After you complete Form. 502B, enter your total exemption amount on your Maryland return in Part C of the Exemptions section. Enter the SDAT Real Property Tax Identification Number of the property for which Homestead. Eligibility isrequested. This credit is for seniors 70 and over who have owned property in Caroline County for 15 years. You can download the senior credit form from our site. The second option is to complete the application online. Homestead Property Tax Credit The Homestead Property Tax Credit in Maryland limits the increase in taxable assessments each year for a primary residence.