You may file this application online at onestop.md. Maryland requires all homeowners to submit a onetime application to establish eligibility for the Homestead Tax Credit.A homeowners' exemption may also apply to a supplemental assessment. For more information, call (925) 313-7481. STATEMENTS. This claim may be used to file for the Homeowners' Exemption for the Assessment Roll and the Supplemental Assessment Roll. To qualify for the homeowners' exemption, the home must have been the principal residence of the owner as of January 1 of that tax year. Welcome to the Contra Costa County Clerk-Recorder's Official Records Index. You may opt out at any time per our Privacy Policy. Submit. See Homestead Savings v. (925) 687-8101. Delivery