Scott Morrison says 2020 budget's spending plans will go ahead even if forecasts prove wrong

Prime minister says post-budget debate over underlying assumptions, including turbo-charged economic growth next year, is overstated'

• Federal budget summary: all the key points at a glance

Scott Morrison has declared the government will deliver all the big-spending elements of Tuesday night's budget even if the rosy assumptions underpinning the economic statement turn out to be wrong.

As the government embarked on the traditional media blitz to sell the budget, the Labor leader, Anthony Albanese, was preparing to use Thursday night's budget reply speech to outline elements of new childcare policy and a commitment on energy.