TESCO could have to cough up £5.6 million in back pay for up to 140,000 workers after shopworkers’ union Usdaw discovered a discrepancy in the supermarket chain’s payroll.
The union said some Tesco workers have had sums docked from their wages in return for voluntary benefits such as childcare vouchers.
But the deductions left the workers on less than the legal minimum wage.
Usdaw said it was negotiating with Tesco bosses to recover the back pay.
In a statement, Usdaw national officers Pauline Foulkes and Joanne McGuinness said: “We continue to work with the company to ensure all staff affected are informed and that their pay is corrected and reimbursed as a matter of urgency.
“For the majority of staff, this is likely to be up to £40.”
They said the union’s priority was to avoid any repeat of the payroll discrepancy.