THE Victorian Government is banking on earning $84.7 million from its $95,000-a-hectare vendor tax next financial year.

The Budget estimate comes despite the fact the Government is yet to draft legislation outlining details of its Growth Areas Infrastructure Contribution, or vendor tax, as opponents prefer to label it.

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The GAIC will be applied to all eligible Urban Growth Boundary land sold or subdivided since December last year and applied at a rate of $80,000/ha for land brought into the growth boundary in November 2005, or $95,000/ha for land brought into the boundary in the future.

A spokeswoman for Planning Minister Justin Madden said legislation introducing the Growth Areas Infrastructure Contribution was likely to be introduced in July.

The Government has proposed the tax to cover 20 per cent of the cost of building roads, public transport and other infrastructure in new urban growth areas.

"Once the GAIC legislation is in effect, the contribution will apply to either the first sale of the land or its subdivision, or the building permit for major building works, whichever occurs first," the spokeswoman said.

But landholders, the Victorian Opposition and even the Law Institute of Victoria say they've been told little of how, when and under what conditions it will be applied.

Law Institute of Victoria president Danny Barlow said the GAIC was another example of how the Victorian Government launched legislative reforms without first consulting those who were most affected.

"Why don't they talk to people in the community before they do these things?" Mr Barlow said.

"We're the ones who are putting it in place with contracts. We're the ones who're asked, 'how does this affect me?'."

Mr Barlow said he would be writing to Planning Minister Justin Madden this week to air his concerns.

Meanwhile, the Victorian Coalition has vowed to amend any Government legislation that comes before the Upper House seeking to impose a vendor tax.

Liberal-National Coalition planning spokesman Matthew Guy said he did not support an up-front tax contribution from landholders.

But the Victorian Greens argue the Government will have to negotiate with them, given the party's three members hold the balance of power in the Upper House.

"The Libs aren't going to vote for it so at some point they'll (the Government) have to come to us with a proposal," Greens planning spokesman Greg Barber said. "And we'll either say go fish or OK."

Mr Barber said he did not want to pass judgment until the legislation was drafted, but the Greens had concerns about the social equity of the tax arguing it should be targeted at where the real uplift in value occurs.