To claim the exemption, the homeowner must make a one-time filing with the county assessor where the property is located. This local option prevents any large shift of the property tax burden to the residential class of property owners after a revaluation.Use Form HS-122, Homestead Declaration and Property Tax Credit Claim. Due to a new legislative change, owners or qualifying relatives of owners can now file for homestead using an Individual Taxpayer Identification Number (ITIN). Taxpayers can complete transactions on MyTax DC or call 202-727-4TAX.