Planning Minister Matthew Guy has been referred to Victoria's anti-corruption watchdog after Ombudsman George Brouwer concluded allegations of secret fund-raising meetings with property developers could be corrupt conduct.

Labor asked Mr Brouwer in March to investigate a report in The Age that Mr Guy intervened in the planning process by helping property developers who each paid $10,000 to a Liberal fund-raising arm to attend private dinners.

Matthew Guy. Credit:Luis Enrique Ascui

Opposition anti-corruption spokeswoman Jill Hennessy told Parliament's public accounts and estimates committee that Mr Brouwer sent a letter to Labor pointing out he had a legal obligation to notify the Independent Broad-Based Anti-Corruption Commission (IBAC) of ''any matter that appears to involve corrupt conduct''.

Ms Hennessy told the committee that Mr Brouwer said he had consequently referred the allegations to the commission.