The drop in the Earners' Account Levy, which is paid by wage and salary earners, reduces the cost of ACC on employees. Smith says employers must update their payroll systems for workers to receive the full benefit of this.
"It is far better for workers to pocket the savings from the ACC levy changes rather than it accidentally go back to the IRD."
"Workers can put it towards their own personal costs or savings, which is essential in the sluggish economic climate."
The average Work Account Levy paid by employers will also decrease from $1.47 to $1.15 per $100 of liable earnings.
The removal of the 2 per cent tax exemption means employer contributions to KiwiSaver will be taxed at the employee's top tax rate.
Finance Minister Bill English has said the tax exemption was being axed because it unfairly favoured higher income-earners and had to be considered against programmes like Working for Families and interest-free student loans.
Separate tax codes for employees with student loans are also being introduced on April 1, making it compulsory for all those with student loans to use a student loan tax code.
This story has been corrected from an earlier version which incorrectly said the ACC Earner Levy had fallen from $2.04 to $1.07 per $100 of earnings. The correct figure is $1.70 per $100 of earnings.