A Hampton T-shirt and clothing company has been fined over $18,000 and ordered to pay nearly $124,000 in back wages to compensate 40 workers after the U.S. Department of Labor accused it of two major wage law violations.

The Department of Labor’s Wage and Hour Division said that the 40 employees of The Shirt Factory of Hampton Beach LLC paid some of its employees in cash off the books and paid straight time for overtime for hours over 40 in a workweek. The Department said the company also failed to pay one worker wages for nearly a month.

The LLC operates five separate stores, The Shirt Factory, Impressions Beachwear, Extreme Beachwear, Maggie’s Beachwear and Fashion City.

Federal investigators determined the company also did not keep accurate payroll and time records for employees paid in cash. The violations of the overtime, minimum wage and record-keeping requirements of the Fair Labor Standards Act affected low-wage retail workers at five Hampton Beach locations.

The investigation recovered $59,247 in overtime back wages and $2,628 in minimum-wage back wages, plus equal amounts in liquidated damages. Federal officials assessed a $18,510 civil money penalty due to the violations’ willful nature.