Updated 4.58pm: The RSA says the process involved in changing the flag is unnecessarily complicated and costly.

Over the next few weeks Parliament's Justice and Electoral Committee will consider the New Zealand Flag Referendums Bill, reporting back to Parliament by the 19th of July.

Chief executive of the RSA, David Moger says the RSA will take its support for the country's flag to the committee.

He says the RSA's main concern is the process of the decision, which will cost around $26 million.

"A two question referendum is unneccesary and far too expensive. Our preference is that it should be a simple question up front - do you want to change the flag?

The RSA says ANZAC day should highlight the importance of keeping the current flag.

David Moger says there's no need to change it.

"That is the flag that we have had for the past 100 years, and it's a flag under which tens of thousands of New Zealanders have committed their lives to service and died under it, and that's part of our history and our heritage."