Employers must pay whatever gives the employee the most money.
A spokesperson for Heinz Wattie's said it had recently finalised a review of its historic approach to payments under the Holidays Act, in line with what many other companies in New Zealand had done.
Anomalies in leave calculations were identified as part of this process, impacting a broad range of employees who worked across all New Zealand sites between June 30, 2011 and October 31, 2020, he said.
"We have been totally transparent with employees and have been working methodically at all sites with the support of the unions.
"All current employees who were impacted have received their remediation payments."
This included many of the longer-term employees in Hawke's Bay, with about 1000 receiving remediation payments.
Heinz-Wattie's is now beginning the process of contacting former employees.
"We have in place a system for ensuring that former employees for the period in question receive their payments. This will include advertising through multiple avenues."
The spokesperson said the total amount was confidential.
"We are following a process and meeting our good faith obligation as an employer to current and past employees.
"The process for ensuring that remediation payments are correctly calculated for past and present employees has been complex due to payroll systems which have changed over time."
To verify eligibility, past employees are asked to submit details online at watties.co.nz/holidaysact