More than 25 percent of Americans are dipping into 401(k) retirement accounts to pay for bills, according to a recent report.

U.S. workers are tapping into nearly a quarter of the $293 billion placed into their retirement savings each year to pay for mortgages, credit cards and other debts, according to a report from financial advisory firm HelloWallet. Those in their 40s are the most frequent raiders, with about one-third using their 401(k)s to pay for bills.

Other studies bear out those results. Vanguard, the investment management group in Malvern, said that the number of American workers withdrawing money from 401(k)s or taking out loans against their accounts jumped 12 percent since 2008.

Draining funds that are designed to ensure security when workers retire has raised new worries about the shaky foundation for older Americans.

Many workers use loans that incur large penalties to dip into retirement accounts. In addition to paying income taxes, many are hit with a 10 percent tax penalty.

Matt Fellowes, chief executive of HelloWallet, said there are few winners in that situation.

"What you have is 401(k) participants voting with their wallets, saying they would much rather use their money for other purposes," Fellowes told the Washington Post. "I don't think this can be ignored. Employers are dramatically overpaying for retirement, but it is not benefiting the employee."