Jane Doe never noticed as hundreds of dollars disappeared from her paychecks since she was hired two years ago.
Her company started by taking 3 percent out of every check to put into her 401(k) retirement plan. After one year, Doe — who is fictitious but typical — got a 1.5 percent raise, but the company diverted most of that into her 401(k). The same thing happened the following January.
The money has been going into a target-date fund, which Doe never specifically chose. That fund is programmed to select an array of stocks, bonds, and other asset categories based on Doe’s age. As she grows older, the percentages will gradually shift, without any instructions from Doe.
Theoretically, if this arrangement continues, Doe will be able to retire in about 35 years with almost enough money to live comfortably. Her paycheck and retirement plan have been on autopilot, because Doe and her company have tacitly agreed that she cannot be trusted to make the right decisions.
This sort of plan has spread quickly through the 401(k) world in the last six years, and even more growth and varieties are predicted. It is related to a concept sometimes called ‘‘libertarian paternalism’’ — subtly pushing people to make rational choices — that has been applied in other fields, like checkoffs for organ donations on driver’s license applications. In the retirement world, it means that employees’ money is automatically invested in a savings plan, unless they specifically opt out.
‘‘It plays into the fact that inertia is a very powerful force,’’ said Robert A. Benish, executive director and interim president of the Plan Sponsor Council of America, a trade group for employers. With the automatic features, he said, ‘‘you can jump-start someone without pain.’’
While automation achieves its basic goal of increasing savings, however, it seems to contradict one of the original justifications for 401(k)s — that individuals want to be in charge of their own retirement planning.
Proponents say that is partly because many conditions have changed since the first 401(k) plans were established three decades ago.
Traditional pensions have all but disappeared, markets have become more volatile, wages have stagnated, and more research has been done on financial behavior.
‘’Our view in 1980 was unsophisticated about individual decision makers,’’ said Stephen P. Utkus, director of the Vanguard Center for Retirement Research at Vanguard Group, one of the largest plan administrators.
The automatic features were developed because specialists feared that people were not signing up for 401(k) plans on their own initiative, not putting in enough money, and not choosing appropriate investments.
For instance, Fidelity Investments, the largest administrator, said that among its clients, only 56 percent of eligible employees participated in plans without automatic features versus 90 percent in the automated plans.
Their use got a big boost from changes in federal pension law in 2006, which clarified that auto-enrollment would not violate state withholding laws. Today about half of all plans have at least one type of automation, according to the Plan Sponsor Council of America and others.
Advocates say the biggest problem is that too little money is being taken from paychecks.
“I don’t think auto-enrollment is a good thing if you’re not going to auto-enroll them at a high rate,’’ said Robyn Credico, director of defined contribution consulting at the consulting firm Towers Watson in New York.
Moreover, the automatic features do nothing to solve another big problem with 401(k) plans, that people erode their accounts by taking out money as loans and hardship withdrawals.
The conventional wisdom is that people need to squirrel away 15 to 17 percent of their earnings to accumulate a sufficient nest egg. But the automated scale, even with annual escalation, usually tops out at 6 to 10 percent.
Thus, companies are moving the starting line.
According to recent studies by Vanguard, the Plan Sponsor Council of America, and the consulting firm Aon Hewitt, one-fourth to one-fifth of employers now use 5 percent or higher as the initial paycheck deduction, rather than Jane Doe’s 3 percent, with a final goal up to 15 percent.
There has also been talk of automating the payouts after people retire, by attaching some sort of annuity to the target-date funds — in other words, creating something similar to traditional pensions.
Proponents, however, say they need more legal guidance from the federal Labor and Treasury departments.