NZ Herald published an explainer on 21 September 2026 examining a little-known feature of the opposition Labour Party’s proposed capital gains tax (CGT): property owners who bought at the market’s peak could still face a tax bill even though their property remains worth less than they originally paid for it.
Labour’s CGT, part of its platform for the 7 November 2026 general election, would apply a flat 28 percent tax on the profit made when a commercial property or residential investment property is sold, according to the party’s official policy page. The family home, farms, KiwiSaver, shares, business assets and inheritances are exempt. The tax is not retrospective: it would apply only from a “valuation day” set for 1 July 2027, meaning existing properties would effectively be revalued as at that date, and that valuation-day figure — not the original purchase price — would become the baseline for calculating any future taxable gain.
Because the cost base resets to the property’s value on valuation day rather than its original purchase price, an owner who bought during a market peak and has since seen prices fall could still owe CGT if the property’s value partly recovers after 2027, even while remaining worse off overall than what they originally paid. New Zealand currently has no general capital gains tax; the closest existing rule is a bright-line test that taxes gains on residential property resold within a set number of years of purchase.
The policy remains a proposal contingent on Labour winning the November election, not enacted law. It has already drawn criticism from the governing National Party: Campaign Chair Simeon Brown said in a 15 September 2026 statement that because the tax does not carve out inflation, “Kiwis face the prospect of paying large tax bills not because they are genuinely better off, but because inflation has pushed up the paper value of their assets over time.” Labour has not detailed, in the material reviewed, a response specific to the peak-purchase scenario raised by NZ Herald’s explainer.
References
NZ Herald – Explainer: What Labour’s Capital Gains Tax Means for Properties Worth Less Than They Were Bought For / NZ Labour Party – Capital Gains Tax to Level the Playing Field for Businesses, Create Jobs and Fix New Zealand’s Health System / New Zealand National Party (via Scoop) – Labour’s Capital Gains Tax Will Also Tax Inflation
