A new study finds 80% of Gen Zers have worked outside their main jobs. LeoPatrizi/Getty Images

Having a job doesn't always mean you have enough to cover daily living or savings goals.

A July survey of Americans by Goldman Sachs Asset Management and the behavioral economics firm Escalent found over 60% of respondents have worked outside their primary roles, largely because they needed to. Twenty-seven percent of respondents said work covers their expenses, but it's tough to get ahead.

"Employment remains essential for retirement security, but for many Americans, it is no longer sufficient," a Goldman Sachs Asset Management retirement report said.

Gen Zers were most likely to say they earn or have earned money outside their primary job; millennials followed closely behind.…