The Tourism Industry Association says "mondayisation" of some public holidays will have real flow-on benefits for the domestic tourism sector.
The Holidays Bill, which would mean that when Waitangi or Anzac day fall on a weekend, people would be given the following Monday as a holiday, will have its second reading in Parliament tomorrow.
The tourism association's policy and research manager Simon Wallace says the holiday park sector experienced an increase in visitors staying when Waitangi Day fell on a Monday last year.
He says three-day weekends are better for businesses and extra costs will be outweighed by the extra tourism dollars being spent.
Mr Wallace says mondayisation would help stimulate the $36 million- a-day domestic tourism sector.
The Holidays (Full Recognition of Waitangi Day and Anzac Day) Amendment Bill is in the name of Labour's David Clark.
It will transfer Waitangi Day or Anzac Day public holidays to Monday if they fall on the weekend.
The National Party caucus will not vote for the legislation, but Mr Clark says it will have the numbers to pass.
Prime Minister John Key says the Government will not use veto powers to block the Holidays Bill.
Though the bill is likely to pass, decided National would still vote against it.
Pacific Helmets chief executive David Bennett says he is pleased with National's stance.
Mr Bennett says it could cost him up to $15,000 for each public holiday moved to Monday.