The Liberal government led by Prime Minister Mark Carnie will face its second confidence vote in the House of Commons on Friday, having won the first vote on Thursday.
This comes after the NDP, the Bloc Quebecois, and Green Party leader Elizabeth May voted with the minority Liberals in the House of Commons on Thursday to defeat a Conservative sub-amendment to the budget.
The Conservative motion was a sub-amendment to the Bloc's own budget amendment.
Governments must win confidence votes to remain in power.
NDP interim leader Don Davies said the party is still reviewing the Bloc's motion and did not indicate whether the NDP would vote against it.
Both the Conservatives and the Bloc Québécois spoke out against the budget after it was tabled on Tuesday, saying it failed to meet their priorities.
The NDP has yet to state its position on the budget, saying on Tuesday that it would take time to review the document.
The minority Liberals need two more votes to survive any confidence vote.
The party increased its seat count to 170 after Nova Scotia MP Chris d'Entremont resigned from the Conservative caucus and joined the Liberals on Tuesday, but the Speaker of the House of Commons does not vote unless there is a tie, so they have 169 votes.
The current Speaker is Liberal MP Francis Scarpaleggia.