Sixty-year old Mark Legowski of Farmington pleaded guilty last month to filing false tax returns.

A self-employed accountant and tax return preparer, he operated under the name Legowski and Co. Court records showed that he reported returns for from 400 to 500 individual clients and 50 to 60 businesses.

For the tax years, 2015 to 2017, Legowski under-reported the firm’s gross receipts by excluding some customer payment checks from the firm’s bookkeeping system, and applying that false amount to his business returns

The Internal Revenue Service said it had a tax loss of $499,289.