Close to 3000 workers at the Inland Revenue Department (IRD) will strike on Wednesday.
The Public Service Association (PSA) says members will strike because "their employer is refusing to come back to the table to discuss pay and pay systems".
It's the third strike for IRD workers - they walked off the job earlier this month along with Ministry of Business, Innovation and Employment workers, and again on July 23.
This time MBIE won't be joining the strike, but their dispute is yet to be resolved.
PSA National Secretary Glenn Barclay says one-quarter of staff are paid less than $48,000, and many are struggling to make ends meet.
"Our members are asking for two very reasonable things: fair pay systems and a modest across-the-board pay rise," Mr Barclay said.
"We aren't asking for a Government handout - IR has got the money to do this."
In Auckland, members will strike 8:30am until 12:30pm. In the rest of the country, strikes will take place from 9am until 1pm.