To fill out the one-time Homestead Tax Credit Application (principal residence assessment cap). You may file this application online at onestop.md.You must file with the county or city where your home is located. Each county has different applications and required documents. Maryland requires all homeowners to submit a onetime application to establish eligibility for the Homestead Tax Credit. Online: Go to Homestead Tax Credit Eligibility Application page, and complete the online form. Filing an online application will be faster than mailing one in. Homestead Property Tax Credit History. If handwritten please print legibly. The State of Maryland provides a credit for the real property tax bill for homeowners of all ages who qualify on the basis of gross household income.