The percentage of workers who said they were very confident about having enough money to retire comfortably dropped to 18 percent this year from 27 percent in 2007, according to the 2008 Retirement Confidence Survey.

That represents the largest one-year drop in confidence in the 18-year history of the survey, the study said.

At the same time, the percentage of workers who said they lacked confidence about having enough money for a comfortable retirement jumped to 37 percent this year from 29 percent in 2007.

The survey was conducted by the Employee Benefit Research Institute, a Washington retirement research organization, and Mathew Greenwald & Associates, a Washington public opinion and market research company.

“The good news is that after years of false optimism, at least active workers are beginning to realize that their current level of retirement savings appears to be inadequate for living comfortably throughout their retirement years,” said Jack VanDerhei, one of the study’s co-authors, in an interview. VanDerhei is also an EBRI fellow and professor at Temple University.

The survey also found that the percentage of retirees who were very confident about maintaining enough money for a comfortable retirement plummeted to 29 percent this year from 41 percent in 2007. The percentage of those lacking confidence rose to 34 percent this year from 21 percent last year.

While the survey found that the percentage of workers who say they’ve saved for retirement rose to 72 percent in 2008 from 66 percent the year before, nearly half of those saving for retirement had total savings and investments — minus the value of their primary residences and any defined-benefit plans — of less than $50,000. Seventy-six percent of workers who said they had not saved for retirement reported total assets of less than $10,000.

The survey also said that while 41 percent of workers said they or their spouse had a defined-benefit plan, 59 percent said they expected to receive income from a defined-benefit plan in retirement.

The discrepancy between those numbers suggests that some workers may be under the illusion that they will receive a retirement benefit that they will not actually get, the study said.

The EBRI-Greenwald survey was based on telephone interviews of a random sample of 1,057 workers and 265 retirees in the U.S. age 25 and older.

Filed by Pensions & Investments, a sister publication of Workforce Management. To comment, please e-mail editors@workforce.com.