Such changes would be a major shift for industries where, since labour market deregulation in the early 1990s, unionised workforces have been largely replaced by people on individual contracts. Thta has decimated union membership.
The FPAs are the centrepiece of the second leg of the Labour-led government's industrial law reforms, aimed at improving the ability of trade unions to exert bargaining power in wage negotiations. The first tranche, passed last year, rolled back a variety of reforms implemented by the previous government.
Prime Minister Jacinda Ardern has sought to allay employers' concerns by suggesting that only one or two nationwide FPAs might occur within the current parliamentary term - the implication being they would likely cover employees of government agencies rather than private sector employers.
National, however, says the proposals now emerging indicate the government's agenda is to impose "compulsory unionism by stealth".
"Businesses and workers should be frightened. The recommendations from the working group are as radical as we originally feared - backwards, one-size-fits-all and rigid," said National's workplace relations and safety spokesperson Scott Simpson.
Simpson said the proposals would see FPA bargaining initiated on the strength of 10 percent of all workers - both union and non-union - electing to seek an FPA.
The report recommends that only workers could trigger the compulsory FPA process, atlhough it appears that sectors in which harmful labour practices were present could also be cited as a trigger for beginning national negotiations.
A key element of any claim would be setting boundaries around any particular group of workers to be covered by an FPA. The working group recommendations are understood not to place restrictions on how broad or narrow that group might be defined to be, leaving that to be negotiated between the parties.
Employers would be expected to nominate national representative employer bodies to represent their interests while trade unions would represent workers covered by the category definition.
The proposals do allow FPAs to include regional pay variations. While enterprise-level agreements will be possible, they will be required to match or better the terms of an FPA.
Negotiations will have to be carried on in good faith and there will be no ability to call strike action while a negotiation for an FPA is underway, unless the action relates to issues outside the scope of the FPA.
The new national agreements could be struck for a maximum of five years before requiring renegotiation.