Not so long ago, employers competed for younger workers with unlimited snacks and foosball tables. But with total student debt now at more than $1 trillion in the United States, a new trend may be starting to emerge: debt relief as a perk.

Consulting giant PwC announced last week that it is offering $1,200 annually to employees at the two most junior levels to help pay down student debt. PwC hires 11,000 employees a year from college campuses. A whopping 80 percent of the company's staff are millennials — the demographic group that spans ages 22 to 35.

"We are taking some of that burden off them in the initial phases of their career," said Shannon Schuyler, principal, U.S. corporate responsibility leader and chief purpose officer at PwC. "And it does not come with golden handcuffs.

Gabriela Gutierrez, who started as an associate at PwC in August, has about $30,000 in student debt.

Her employer offers some good perks, like yoga classes and a small gym. "That is really nice," Gutierrez said. But the most valuable one for Gutierrez is getting student loan relief, she said.

Almost seven in 10 college grads owe money, with an average debt of $28,400 for the Class of 2013, according to the Institute for College Access and Success.

A recent study by IonTuition found that nearly 80 percent of those with student loan debt want to work for a company that offers repayment assistance — with a matching opportunity. More than half of those surveyed would rather have the amount they are paying for health care go toward their student loan balance. And about half of respondents would prefer contributions to student loan payments rather than to a 401(k) retirement plan.

Companies are contributing $50 to $200 a month to help employees pay down student debt, according to Brendon McQueen, chief executive of employee student loan management firm Flex395.

ChowNow, an online food ordering company, and a client of Flex395, recently started offering a matching program to help some of their employees pay back student debt. ChowNow contributes up to $1,000 a year.

Ball and chain

Student debt is a ball and chain for young people, and is often a bigger priority than retirement, said Christopher Webb, ChowNow's chief executive. "Like everything, you have to stand out to attract talent," Webb said.

Andrew Josuweit, chief executive of student loan advice site Student Loan Hero, said priorities are changing for recent college graduates.

"If you are a young adult, and you are just out of school, it makes a lot more sense to pay off your debt instead of focusing on your 401(k)," Josuweit said.

Of course, investing at an early age should be a priority as well, Josuweit said. But depending on the level of debt and the interest rate, it makes sense to run the numbers. Student Loan Hero and Flex395 owner both have tools to help manage student debt.

And while it is tough to compete with free tacos and regular happy hours, the reality-driven millennial generation may take a shine to companies when they hear about programs that make them financially fit.

Bobbi Rebell is a Reuters contributor.