A majority of Americans with 401(k)-type savings accounts are accumulating debt faster than they are setting aside money for retirement, further undermining the nation's troubled system for old age saving, a new report has found.

Three in 5 workers with defined contribution accounts are "debt savers," according to the report released Thursday, meaning their increasing mortgages, credit card balances and installment loans are outpacing the amount of money they are able to save for retirement.

The imbalance is expanding even as policy makers are encouraging people to set aside more by offering generous tax breaks and automatically enrolling workers in retirement accounts that in some cases automatically escalate the amount of money over time.