A few simple changes now can make a big difference in your nest egg later.

The 401(k), Americans’ ticket to retirement, is getting an upgrade. Many plans are already enrolling workers automatically and upping their contributions each year. Soon it will be easier to figure out how much your plan is charging you, whether your target-date fund is aligned with your goals, and who you can turn to for investment advice.

The next decade will be a turning point for 401(k) plans, says Chip Castille, head of defined-contribution plans at BlackRock, the world’s largest asset manager. That’s great news for the nearly 50 million workers who rely on 401(k) plans as their primary — and in many cases, only — source of retirement savings.

In the meantime, inertia, once the foe of employees who delayed signing up for their company 401(k) plan or dithered over investment choices, has become their new best friend. Despite devastating market losses in 2008, most 401(k) participants stuck with their investment plans and continued to make regular contributions. As a result, the average 401(k) balance increased 23% in 2009, and many accounts rebounded to their prerecession levels, according to a new Vanguard study of more than three million plan participants.

That’s encouraging news, but don’t get too complacent. Most employees could — and should — do more to secure a comfortable retirement. Start by making sure you have a plan that fits your personality, whether you need hand-holding or prefer to go it alone. If your plan falls short, follow our advice on how to lobby your boss to improve it. A few small changes in how you save and invest your money today can make a huge difference in your future nest egg.

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Q: How do I know whether my 401(k) is any good?

Your plan should offer a well-diversified mix of low-cost investment choices. An employer match is a plus because employees tend to save more when their company kicks in money. Investment guidance and regular, personalized report cards to show you whether you’re on track are important parts of a great 401(k) plan.

A few years ago, Stephanie Banister, director of finance at Accept Corp. a software company based in Santa Clara, Cal. took a hard look at her company plan and didn’t like what she saw. She wasn’t satisfied with the investment choices and, despite her previous experience as comptroller of a pension firm, she couldn’t figure out how much the company or the individual employees were paying in fees for their 401(k). The plan’s custodian wasn’t much help.

So, with her boss’s blessing, Banister hired an independent consultant to review the company’s plan and, ultimately, put together a better one. At the time, Accept had only 28 employees, but Banister knew that the start-up firm needed a solid 401(k) plan as a recruiting tool. Because of economies of scale, large companies can usually hold the total fees in their 401(k) to well below 1% of assets each year, but smaller plans often pay fees of 3% or more annually. By switching providers and redesigning the plan, Accept was able to cut the fees its employees pay to about 1.2% annually — less than half of what they were being charged by their former custodian (not counting a flat administrative fee paid by Accept).

Q: How do I choose the right investment mix?

At Accept, employees can choose from five professionally managed portfolios of low-cost index funds. They range from aggressive-growth funds heavily tilted toward stocks for the under-30 set to an income-heavy mix for employees near retirement. The plan clearly outlines each portfolio’s underlying investments, fees and projected rate of return. All employees have to do is select a portfolio and let the plan’s investment manager handle the rest.

Accept has nearly 50 employees now, and Banister, who also acts as human-resources manager, often lectures new hires about the importance of saving for their future. If an employee does not want to participate in one of the portfolios, they have to give me a notarized waiver, says Banister. So far, only one has opted out.

Q: How much of my salary should I be putting away?

Probably more than you’re socking away now. Most employees are saving 7% a year or less, and employers that offer matching contributions typically kick in 3% of pay. That simply isn’t enough. The old rule of thumb of saving 10% of your gross pay was designed in the days when more people had access to traditional pensions and employer-provided retirement savings. In this era of you’re-on-your-own retirement, you should aim to save about 15% of your gross salary, including any employer contribution. Workers are permitted to stash up to $16,500 in their retirement accounts in 2010; those 50 and older can squirrel away an extra $5,500 in catch-up contributions.

Hewitt Associates, a benefits consulting company, estimates that the average employee needs to save about 11 times annual earnings — on top of Social Security benefits — to maintain his or her standard of living in retirement. So if you earn $50,000 a year, you should strive to save $550,000 by the time you retire. Assuming you withdraw 4% a year, or $22,000, from your portfolio and you receive about $20,000 a year from Social Security, you would be able to replace the recommended 85% of your current income in retirement. (If you have a pension or other source of retirement income, such as a part-time job, or you expect to sell your house and live off the proceeds, you may not need to save as much.)

Hewitt projects that 80% of workers will fall far short of that goal unless they beef up their savings now or plan to work longer. This is a wake-up call for employees, says Rob Reiskytl, Hewitt’s leader of retirement-plan strategy and design. A separate study by the Employee Benefit Research Institute found that nearly half of current workers are at risk of running out of money during a lengthy retirement. Retirement may be a long way off, but workers need to start saving or be prepared to dramatically reduce their overall spending in retirement, Reiskytl warns.

Q: When should I start saving for retirement?

As early as possible. A Hewitt analysis shows that a 25-year-old employee who makes $30,000 a year should meet all of his retirement needs if he continues to save 11% of pay each year throughout his career — assuming he also receives a 5% employer contribution. But if he waits until age 40 to start saving, he’ll have to stash 17% of pay in his 401(k) each year to amass an adequate nest egg.

If your current savings rate is on the skimpy side, don’t panic. You can build up your contributions over time. Hewitt found that many workers who commit to increasing their retirement contributions by as little as 1% of pay each year for five years will be on track to meet most of their financial needs in retirement.

Q: Help! I really need investment advice.

Brooke Whicher, 28, is the first to admit that she didn’t know much about investing, so she was glad to accept the one-on-one guidance that was offered when her company switched to a new 401(k) provider a few years ago. The adviser explained how Whicher’s ultra-conservative portfolio of stable-value and bond funds was inappropriate for someone who has four decades to build a retirement nest egg. She agreed to add some domestic and international stocks and a dash of real estate holdings to her mix and to sign up for an auto-escalation feature that will eventually boost her contribution rate from 4% to 10% of salary.

In addition to her semiannual face-to-face meetings with representatives from the Principal Finance Group, she receives quarterly account statements that chart her progress. At her current 8% contribution rate, plus an employer match, she’s on target to accumulate about $2.7 million by the time she’s 67, assuming an 8% annual rate of return. Boosting her contribution to 10% would put her on track for a $3-million nest egg nearly 40 years from now.

More than half of all plans currently offer investment advice to participants. A recent survey of more than 260 plan sponsors found that 25% of them will add an advice component when the U.S. Department of Labor issues long-awaited rules on who may dispense unbiased advice, either in person or through computerized models, and how they may charge for those services.

If you don’t have access to investment advice at work, you can use retirement-planning tools from TD Ameritrade or Fidelity. Or, for $200 a year, you can get personalized advice about the investment choices within your plan from Smart 401k .