Winston Peters says there is still work to be done with both parties before NZ First can make a decision.
The New Zealand First leader said they had got a lot of work done and the board's engagement was complete and it was going home.
Peters said further discussions were needed with the leaders of both National and Labour.
The board had not reached a consensus on a final decision, but there was consensus on "the policies put to both sides and how far we've got".
"We have two sets of policy arrangements, they're obviously different because they're different parties. The board knows precisely what they'll both mean depending on what we do, if we take that choice."