Two polls published on Sunday night suggest that the federal election is tightening, although both continued to show Labor ahead, with any movement inside the margin for error.

The Ipsos poll published in the Sydney Morning Herald and the Age on Sunday night had Labor ahead 52-48, a one-point drop from the result a month earlier.

Newspoll, also released late on Sunday and published in the Australian, put the figures the same as a week ago, at 51-49 to Labor, but with a one-point fall in its primary vote to 36%.

Scott Morrison will start Monday in Sydney, spruiking the Coalition’s help for the nation’s businesses, including a new plan for a $50m fund to give manufacturers incentives to invest in more modern technology.

Ultimately, the government’s initial investment is expected to attract $110m from the manufacturing industry as it is given out in funding-matched grants.

That would be good news for Australians looking for jobs, according to the science minister, Karen Andrews. “We want to keep our manufacturers at the cutting edge so they can create more jobs,” she said.

The Coalition also wants to reinvigorate the Australian Made campaign, to encourage more foreigners to buy products made down under.

Bill Shorten will also start the day in Sydney, probably visiting a hospital as he talks up Labor’s commitment of $500m to upgrade the nation’s emergency departments and get them more staff. The party has released a state-by-state breakdown of where it will spend the money.

This shows the funding would cover the equivalent of 654 more beds, 1,812 doctors or 3,714 nurses in New South Wales, Victoria, South Australia, Queensland and Western Australia.

The prime minister is likely to accuse his Labor rival of revealing too little about what his policies will cost at Sunday’s Labor campaign launch in Brisbane. The opposition will deliver its full costings on Thursday or Friday.

The shadow treasurer, Chris Bowen, has fired back, writing to his Liberal counterpart, Josh Frydenberg, to demand the Coalition ask Treasury to publish the cost of giving a tax cut to people earning more than $180,000. The pair will face off at a debate at the National Press Club in Canberra at lunchtime.

The Liberal party will hold its own campaign launch next Sunday, just a week out from the 18 May election