A series of problems with the Morrison government's $130 billion JobKeeper program have been resolved amid growing concerns about its feasibility for many small businesses.

Treasurer Josh Frydenberg announced a string of changes to the pandemic response program late on Friday afternoon, which the government had put in place to keep workers linked to their employers.

Treasurer Josh Frydenberg has made some changes to the JobKeeper wage program. Credit:Alex Ellinghausen

While broadly welcomed by the business community with more than 400,000 formally enrolling in the scheme this week, there have been a series of complaints about its structure and operation.

They include pressures on small businesses to find a month's worth of wage payments upfront, much higher wages for almost 1.7 million part-time workers, rules governing charities and even the structure of firms.