More than 40,000 current and former Bunnings employees are set to receive their unpaid superannuation entitlements after the hardware giant on Friday revealed the quantum of its underpayment case.

In late September, the retailer admitted it had failed to pay a number of its workers superannuation since 2011, blaming the issue on an error in its payroll system.

Bunnings has revealed the total bill for its underpayment case has topped $6 million.

Today the company revealed the total amount of underpaid super came in at $3.89 million and affected a total of 40,890 workers. With compensation included, the figure increased to $6.1 million.

The average underpayment per team member, compensation excluded, equated to $95.33, with the majority of workers set to receive a back payment of under $70. Bunnings has already issued the funds to the Australian Taxation Office.