The Public Services Association says that up to 1200 people who care for the disabled are taking industrial action in an attempt to secure a pay increase of 23%.
The PSA says 23% is the difference between what those working for the NZ Care company and their counterparts in hospitals.
Assistant national secretary Warrick Jones says its members are still working, but will not drive people anywhere, or do paperwork.
If an agreement is not reached, he says union members will continue to reduce their duties.
NZ Care says its employees are paid in accordance with the group's funding from the Ministry of Health.
Group general manager Donna Mitchell, says the Ministry has offered it an increase of 1.5% this year.
Negotiations between both parties began at 1pm on Monday.