A Turnbull government "battlers budget" risks undermining economic stability, a leading economic forecaster has warned, as the government lays the ground work for personal income tax cuts this year.

"Here we go again, a government lagging in the polls looks set to leave behind a poison pill," said Deloitte Access Economics partner Chris Richardson.

"Labor did it with spending in 2013, the Coalition with tax cuts in 2007, and now 2018 looms as a 'battler's budget' of tax cuts."

The call, contained with the Deloitte's quarterly business outlook to be released on Monday, comes after Treasurer Scott Morrison reiterated the government would focus on delivering personal income tax cuts in 2018.