Labour quickly retreated from that suggestion. Today's plan hinges on setting up a special commissioner for tax avoidance who would focus on multinational corporations.
Under that commissioner, a new corporate tax unit would "embed" Inland Revenue Department (IRD) auditors in corporations which have a history of tax avoidance either in New Zealand or abroad.
The embedded IRD officials would review multinationals' financial plans where they may affect their tax bills to prevent tax avoidance from occurring in the first place.
However the Herald understands the plan excludes the major banks despite their settlements with IRD early this decade totalling more than $2 billion over their use of complex financial transactions to reduce their tax bills.
Labour's view is the banks are already adequately monitored by the Reserve Bank.
Labour Leader David Cunliffe has previously indicated tax will increase for the wealthy under a government he led and today will also see plans for a new progressive tax rate structure.
Labour further plans to reduce tax avoidance by aligning the tax rate for trusts with that new structure. It projects anti-avoidance measures will boost revenue by $20 million in the initial 2015-16 year, rising to $200 million a year by 2018-19.
The projections are less ambitious than those Labour released during the 2011 election campaign, which suggested anti-avoidance measures could raise as much as $300 million a year in additional revenue.
Tax attack
Projected revenue boost from Labour's tax avoidance crackdown:
• 2016 - $20m.
• 2017 - $100m.
• 2018 - $150m.
• 2019 - $200m.