Domino's Pizza faces a wage bill hike of 11 per cent when a new industrial agreement kicks in, investment bank Deutsche Bank says.

Domino's pay practices have come under the spotlight following a Fair Work Ombudsman investigation into alleged underpayment of staff, and a Fairfax Media investigation alleging widespread underpayment of wages and a model that some franchisees allege pushes them to cut corners.

Domino's subsequently told the market it had audited 102 stores out of more than 600 stores, and found more than 2400 workers had been underpaid and 22 franchisees had been asked to leave the network.

Domino's workers had missed out on penalty rates under an old deal with the Shop, Distribution and Allied Employees Association (SDA).