The country's largest home help service says it'll have to massively overhaul its rostering system under proposed employment standards.
Parliament's transport and industrial relations committee is considering a bill which would mean employers would not be able to cancel shifts without giving plenty of notice and paying compensation.
Healthcare Holdings Limited provides home-based health, rehabilitation and disability support services to more than 50,000 people.
Healthcare Holdings chief executive Peter Hausmann told the committee that employees' hours in the sector change from one day to the next.
He said for example one worker, who had 130 hours of scheduled work, had her roster changed 173 times.
"There's a number of reasons for change," Mr Hausmann said. "Often it's client choice, the clients choose to change the hours when people can come and see them."
Mr Hausmann said the company was working hard to give its employees more regular hours, as would be required under the proposed law.