Contributing part of your salary to a 401(k) gives you three compelling benefits:

• You get an immediate tax break, because contributions come out of your paycheck before taxes are withheld.
• The possibility of a matching contribution from your employer — most commonly 50 cents on the dollar for the first 6% you save.
• You get tax-deferred growth — meaning you don’t pay taxes each year on capital gains, dividends, and other distributions.

The federal limit on annual contributions has been increasing gradually, and is $16,500 for the 2010 tax year. If you’re 50 or older, you may contribute an additional $5,500

Keep in mind, however, that while federal law sets the guidelines for what’s permissible in 401(k) plans, your employer may set tighter restrictions. Plus, it will take time for the administrators of your plan to implement the changes.

What’s more, there are other federal non-discrimination tests a 401(k) plan must meet, one of which applies to “highly compensated” employees. So if you make more than $110,000 a year (the limit for 2010), you may not be permitted to contribute as high a percentage of your salary as some of your lower paid colleagues.

For all its tax advantages, the 401(k) is not a penalty-free ride. Pull out money from your account before age 59-1/2, and with few exceptions, you’ll owe income taxes on the amount withdrawn plus an additional 10% penalty.

Also, be aware of your plan’s vesting schedule — the time you’re required to be at the company before you’re allowed to walk away with 100% of your employer matches. Of course, any money you contribute to a 401(k) is yours.

The above post is from the CNN Money series called “Money 101.”

1. You’re a statistic.

To an insurer, you’re not a person; you’re a set of risks. An insurer bases its premium (or its decision to insure you at all) on your “risk factors,” including your occupation, who you are, what you own, and how you live.

2. Know your home’s value.

Before you choose a policy, it is essential to establish your home’s replacement cost. A local builder can provide the best estimate.

3. Insurers differ.

As with anything else you buy, what seems to be the same product can be priced differently by different companies. You can save money by comparison shopping.

4. Don’t just look at price.

A low price is no bargain if an insurer takes forever to service your claim. Research the insurer’s record for claims service, as well as its financial stability.

5. Go beyond the basics.

A basic homeowners policy may not promise to entirely replace your home.

6. Demand discounts. Insurers provide discounts to reward behavior that reduces risk.

However, Americans waste money every year because they forget to ask for them!

7. At claims time, your insurer isn’t necessarily your friend.

Your idea of fair compensation may not match that of your insurer. Your insurer’s job is to restore you financially. Your job is to prove your losses so you get what you need.

8. Prepare before you have to file a claim.

Keep your policy updated, and reread it before you file a claim so there are no surprises

1. If you get a big refund each year, you’re having too much withheld from your paycheck.

In effect, you’re giving the government an interest-free loan.

2. If you have too little withheld, you may be charged an underpayment penalty.

You must pay 90% of what you owe for the tax year by the end of that year or an amount equal to 100% of your tax liability for the previous tax year, whichever is smaller.

3. Not every dollar of your taxable income is taxed at the same rate.

That’s because portions of your earned income fall into different brackets, which are assigned different tax rates. Generally speaking, the first dollar you make will be taxed at a lower rate than your last dollar. Your marginal tax rate is the tax bracket at which the highest (or last) portion of your income is taxed.

4. Your combined tax bracket determines how much tax you’ll owe on income from investments such as CDs and money market funds.

Your combined bracket is the sum of your top (or marginal) federal tax rate and your top state income tax rate. It may be less if you itemize deductions since you will be able to deduct your state income tax on your federal return.

5. If you file your return by April 15, but don’t pay the tax you owe, you may receive a late payment penalty.

The same goes if you file for an extension. An extension only allows you to file your return after the due date. But full payment is still required by April 15. If you make a partial payment by then, you may be charged interest on the amount outstanding.

6. You can reduce your chances of being audited.

One of the best ways is to fill out your return completely, correctly, and on time every year.

7. You should pay estimated taxes if you’re self-employed; expect hefty investment income or profits from a property sale; or if you don’t have enough taxes withheld to cover the taxes you’ll owe on non-wage-related income.

Retirees should also consider paying them if they haven’t opted for voluntary withholding on their pension or IRA payments. Estimated taxes are due four times a year (April 15, June 15, Sept. 15, and Jan. 15).

8. Your adjusted gross income (AGI) is your total income minus certain “above the line” deductions such as deductible IRA contributions, alimony payments, or health savings account contributions.

Your AGI primarily determines whether or not you’re eligible for tax breaks. Almost every break, be it a deduction, exemption, or a credit, has its own AGI limit.

9. Your taxable income is your AGI minus exemptions and deductions.

The less your taxable income, the less in taxes you’ll owe. That’s why it’s in your best interest to take advantage of tax breaks where you can.

10. A credit is better than a deduction.

A credit is a dollar-for-dollar reduction of the taxes you owe. A $100 credit means you pay $100 less in taxes. A deduction reduces the taxes you owe by a percent of every dollar you’re allowed to deduct.

You calculate the worth of your deduction by multiplying your marginal (or top) tax rate by the amount of the deduction. If you’re in the 25% tax bracket, a $100 deduction means you’ll pay $25 less in taxes (0.25 times $100).

Before you shop, conduct an auto-biography.

Hey, wait. Don’t go down to the car dealer and start shopping immediately. Are you sure that the car, pickup, sport utility or van you have in mind is what you really need?

If you rush into a deal without carefully considering how you will really use the vehicle, you could be making a $25,500 mistake, at the average new-car price.

Sure, you want a car that will make you smile. But consider the purpose of most of your driving. Is it commuting? Hauling kids? Weekends? Vacations?

If you drive more than half an hour to work every day, a combination of a comfortable ride and reasonable gas mileage is important. If you frequently drive clients or co-workers to lunch, a sleek coupe won’t be welcoming for whomever has to crawl into the back seat; you need a four-door sedan.

If you frequently haul your kids and their many friends or classmates, a minivan or sport utility with three rows of seats may be essential. If weekend errands involve hauling building materials or large bushes, that same utility or van will come in handy.

Be honest with yourself. What is the largest number of people you carry regularly? What is the biggest pile of gear, luggage or haul from Home Depot that you regularly carry?

Once you have made this practical matchup, however, you still have lots of choices. With careful planning, you can get a vehicle that you need and really want.

1. Saving for your own retirement is more important than saving for college.

Your children will have more sources of money for college than you will have for your golden years, so don’t sacrifice your retirement savings.

2. The sooner you start saving, the better.

Even modest savings can pack a punch if you give them enough time to grow. Investing just $100 a month for 18 years will yield $48,000, assuming an 8% average annual return.

3. Stocks are best for your college savings portfolio.

With tuition costs rising faster than inflation, a portfolio tilted toward stocks is the best way to build enough savings in the long term. As your child approaches college age, you can shelter your returns by switching more money into bonds and cash.

4. You don’t have to save the entire cost of four years of college.

Federal, state, and private grants and loans can bridge the gap between your savings and tuition bills, even if you think you make too much to qualify.

5. With mutual funds, investing for college is simple.

Investing in mutual funds puts a professional in charge of your savings so that you don’t have to watch the markets daily.

6. 529 savings plans are a good way to save for college and they offer great tax breaks.

Qualified withdrawals are now free of federal tax and most plans let you save in excess of $200,000 per beneficiary. Plus, there are no income limitations or age restrictions, which means you can start a 529 no matter how much you make or how old your beneficiary is.

7. Tax breaks are almost as good as grants.

You may be able to take two federal tax credits — the American Opportunity Tax Credit and Lifetime Learning Credit — in the years you pay tuition.

1. Time is on your side.

Those with more years until retirement can afford to put a greater percentage of their assets in the stock market.

2. Stocks mean risk and return.

Those with a higher tolerance for volatility should put more money in the stock market than those in the same age group who have a lower tolerance.

3. College savings funds need stocks.

Since college costs are rising faster than inflation, no other investment will keep pace as well as stocks. Invest more in stocks when your kids are young, and as they get older move more money into bonds.

4. Get professional advice.

One of the best ways to develop an effective asset allocation plan is to consult a qualified financial planner.

5. Allocation is the key to achieving your goals.

Studies have shown that asset allocation is the single most important factor in determining returns from investing.

6. Know your stock funds.

Before you set up your asset allocation plan, you must find out the nature of the companies purchased by the mutual funds you own. It’s not enough to go by the names of the funds themselves, either. In search of performance, far too many fund managers buy stocks that barely fit their portfolio’s explicit investing parameters. So your “income” fund may, in practice, contain many stocks that should be considered “growth,” or vice versa.

7. Know your bond funds.

Similarly, you must learn the same about the bond funds you own.

8. Don’t rely on software alone to build a savings plan.

Software programs might not go far enough to devise your asset-allocation plan.

9. Determine your long-term goals.

Do you want to buy a sailboat after you retire? Or pay off your mortgage so you can write a novel? Figure out what your long-term goals are, and what they will cost.

10. Get started.

It’s never too late to get started, and it’s never too late to revamp or revise an asset-allocation plan.

The above post is from the CNN Money series called “Money 101.”