Hours before a scheduled leaders鈥 debate on the economy, the Conservative and the NDP campaigns were taking aim at Liberal Leader Justin Trudeau鈥檚 fiscal plans.

In Ottawa, the NDP said that, thanks to Trudeau鈥檚 short-term thinking and inexperience, the Liberals are planning to impose 鈥渄eep鈥 austerity cuts, in a plan that overestimates personal income tax revenue by approximately $1 billion.

Alongside former Saskatchewan finance minister Andrew Thomson, , and questioned why Trudeau had yet to present a formal fiscal blueprint.

, Conservative candidate Jason Kenney launched his own attack on the Liberals鈥 economic pledges.

Kenney accused Trudeau of planning to take away benefits from families and 鈥渞un deficits permanently,鈥 not just the three years the Liberal leader has pledged.

鈥淩ather than run three, $10-billion deficits as he鈥檚 vaguely suggested, Justin鈥檚 spending promises can only be met if he runs deficits more than double that initially, and more than triple that when fully implemented,鈥 Kenney said.

The senior Conservative also said Trudeau鈥檚 鈥渞ecklessness鈥 would plunge Canadians 鈥渋mmediately back into deficit鈥 with growing debts and higher taxes.

When asked about the NDP鈥檚 economic plan, Kenney also went on the attack, saying Mulcair pretends to be a 鈥渘ewfound convert to fiscal spending,鈥 despite major spending demands for 鈥渆very conceivable鈥 government program since he became party leader.

鈥淭his is a cloak-and-dagger routine by the NDP,鈥 Kenney said.

Harper, Mulcair and Trudeau are scheduled to participate in a leaders鈥 debate on the economy in Calgary, Thursday evening.