Nearly $280,000 of Wellington City and Kapiti Coast District Council ratepayers' money was used to underwrite potential losses at the New Zealand Golf Open.
The councils agreed behind closed doors at separate meetings last month to jointly support the event after learning that it might be cancelled without underwriting support.
Wellington City invested $234,000 and the Kapiti Coast $45,000.
Wellington Mayor Kerry Prendergast said the contribution was decided on a population basis.