Forest growers have until March 29 to vote on a planned levy intended to raise around $7 million a year for industry research.
The forests in question are those planted before March 2003 and at least 4ha in area.
If the levy is approved by a majority of the growers voting, and by more than half of the hectares those voting represent, it will be compulsory.
It will be collected on all harvested wood products, apart from firewood, at the point of sale or, if ownership does not change, when a log enters a mill or a wharf for export.
It will initially be set at 27c a tonne, and capped at 30c a tonne for the six years in which the levy, unless renewed, will be in force.