41 C.F.R. § 302-17.50
Requirement to provide tax information to the agency to make the RITA calculation possible under the one-year process
Employees should provide the information their agency requires to make the RITA calculation. This will include tax information for any Federal and State tax returns filed for the year that the employee received covered taxable relocation expenses. Employees should submit this information as soon as they receive their relocation orders, or as soon as they file their tax returns for the most recent tax year, whichever occurs later.