NZ Post is poised to push through another round of job cuts, with 500 management positions reportedly on the line.

New Zealand Post is cutting another 500 jobs as it bids to cope with falling mail volumes.

A spokesman confirmed it was set to consult over the cuts with "managers and specialists at head office and in support roles" with cuts expected to be completed by July.

The cuts will mainly affect staff at the company's headquarters in central Wellington, as well as in Auckland and Christchurch.

KEVIN STENT/FAIRFAX NZ In February, NZ Post chief executive Brian Roche warned that declining mail volumes were outpacing cost cutting elsewhere.

"Changes at New Zealand Post have been widely signalled," a spokesman said in a statement.

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"The number of jobs involved in the proposal is significant. It is expected to be around 500. This forms part of the 1500-2000 roles indicated in late 2013 when the five-year plan was announced."

According to the spokesman, the cuts will "remove layers of management to enable New Zealand Post to make and act on decisions faster".

The statement did not make claims about how much cost would be stripped out in the cuts.

The state-owned company has been struggling against a long running decline in mail volumes, although Kiwibank, which is part of the organisation, is increasingly profitable.

In February, chief executive Brian Roche warned that despite a series of cost cutting measures, the fall in mail volumes, equivalent to 60 million letters a year, was hitting its revenues by $20-$30 million a year.

"The postal services business continues to be challenged by tough market conditions. During the last 12 months letter volume fell by about 60 million units and while we have significantly reduced costs we have not kept pace with the rate of decline," Roche said, as he reported a fall in revenue and profits for the six months to December 31.

Finance Minister Bill English said the job cuts were already signalled, and came despite the organisation working hard to evolve.

"They're continually adjusting to the reality of a lot less letter traffic and working at becoming a bit more of a logistics company," English said.

"They've done pretty well in the circumstances."

Labour leader Andrew Little said more needed to be come to help prepare the workers into new roles.

"The changes at NZ Post have been known about for years. Instead of being bystanders, National should be working with the [company], unions and businesses to ensure a decent work transition for employees instead of leaving them on the scrapheap."