Hours before a scheduled leadersā€™ debate on the economy, the Conservative and the NDP campaigns were taking aim at Liberal Leader Justin Trudeauā€™s fiscal plans.

In Ottawa, the NDP said that, thanks to Trudeauā€™s short-term thinking and inexperience, the Liberals are planning to impose ā€œdeepā€ 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 Liberalsā€™ economic pledges.

Kenney accused Trudeau of planning to take away benefits from families and ā€œrun deficits permanently,ā€ not just the three years the Liberal leader has pledged.

ā€œRather than run three, $10-billion deficits as heā€™s vaguely suggested, Justinā€™s spending promises can only be met if he runs deficits more than double that initially, and more than triple that when fully implemented,ā€ Kenney said.

The senior Conservative also said Trudeauā€™s ā€œrecklessnessā€ would plunge Canadians ā€œimmediately back into deficitā€ with growing debts and higher taxes.

When asked about the NDPā€™s economic plan, Kenney also went on the attack, saying Mulcair pretends to be a ā€œnewfound convert to fiscal spending,ā€ despite major spending demands for ā€œevery conceivableā€ government program since he became party leader.

ā€œThis is a cloak-and-dagger routine by the NDP,ā€ Kenney said.

Harper, Mulcair and Trudeau are scheduled to participate in a leadersā€™ debate on the economy in Calgary, Thursday evening.