An employee of the District’s Office of Tax and Revenue filed hundreds of fraudulent tax returns and swindled D.C. taxpayers out of more than $300,000 in a multiyear scheme, federal prosecutors said, adding another stain on the record of the city’s tax office.

In a court filing, federal prosecutors said that Kimberle Davis, a “control technician” in the OTR, helped prepare 282 fraudulent D.C. tax returns while she also worked a part-time job at a tax preparation company, 2FT Fast Facts Tax Service. Those filings generated $304,909 in income tax refunds.