Labour was forced to reveal its tax policy early, after details were leaked to media over the long weekend.
The party's proposed a 28 percent capital gains tax on all residential and commercial property - but not the family home.
It's promising to use the revenue to fund three free GP visits for all Kiwis.
Newstalk ZB senior political correspondent Barry Soper says Hipkins has voiced frustration with this leak and confirmed whoever leaked the policy will get booted from the party.
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