The District was warned more than once that employees could alter records used to calculate tax bills and refunds, leaving the system vulnerable to manipulation.
Just as internal auditors this year found flaws in the database used to calculate D.C. property tax assessments, external auditors found problems of a similar nature in another database used to process bills and refunds.
The District’s Office of Tax and Revenue did not restrict the access of employees who were able to make “improper adjustments” in the Integrated Tax System (ITS), the billing and refund collection system, according to a Jan. 25 report by the private firm KPMG.
That finding was echoed in a March internal audit that found that a handful of tax office managers could adjust property value assessments without detection in the database that calculates property tax assessments, known as the computer-assisted mass appraisal system. The Office of the Chief Financial Officer, which oversees the tax office, disputed some of the findings.