The Employment Tax Incentive Act came into effect on Wednesday.
The trade union federation is concerned the bill will encourage employers to fire older workers.
WC MEC Alan Winde wants to speed up the youth wage subsidy to create 100,000 jobs in three years.
The trade union federation has been criticised for its hostility towards the scheme.
The DA’s Tim Harris did however complain that provisions were watered down.
Cosatu wants the Employment Tax Incentive Bill, encouraging the hiring of young workers, withdrawn.