Whether you're a newbie or seasoned budgeter, like nearly everyone, you have leaks in your budget that drain money with you hardly noticing.

These little drips can add up to big bucks. Once you find the holes and plug them, you'll keep more money in your pocket. And that spare cash could be the ticket to finally being able to save, invest or break your cycle of living paycheck to paycheck.

Here are 20 common ways people waste money. See if any of these sound familiar, and then look for ways to plug your own leaks.

How to waste your money

1. Buy new instead of used. Talk about a spending leak -- or, rather, gush. Cars lose most of their value in the first few years, meaning thousands of dollars down the drain. However, recent used models -- those that are less than five years old -- can be a real value, because you get a car that's still in fine working order for far less than the new-car price. And you pay less in collision insurance and taxes in the bargain.

Cars aren't the only things worth buying used. Consider the savings on pre-owned books, toys, exercise equipment and furniture. (Of course, there are some things you're better off buying new, including mattresses, laptops, linens, shoes and safety equipment, such as car seats and bike helmets.)

2. Carry a credit-card balance. If you keep a $1,000 balance on a card charging 18%, you blow $180 every year on interest. That's money you could certainly put to better use elsewhere. Get in the habit of paying off your balance in full each month.

3. Buy on impulse. When you buy before you think, you don't have time to shop around for the best price. Resist the urge to make an impulse purchase by giving yourself a cooling-off period. Go home and sleep on the decision. If you still want to buy the item a day or so later, comparison-shop, check your budget and go for it. Often, though, you'll decide you don't need the item after all.

4. Pay to use an ATM. A buck or two here and there may not seem like a big deal. But if you're frequenting ATMs outside your bank's network, the surcharges can add up. Put that money back in your pocket by using ATMs in a surcharge-free network such as Allpoint or MoneyPass.

5. Dine out frequently. A habit of spending $10, $20, $30 per person for dinner can be a huge drain on your wallet. Throw in a $6 sandwich for lunch and a $4 latte in the morning, and you've got quite a leak. Learning to cook, packing your lunch and brewing your coffee at home could easily save you a couple hundred bucks each month.

6. Let your money wallow. If you are stashing your savings in your checking account or a traditional bank account, you are wasting money. You could put it in a high-interest online savings account and get paid to save. You can even get an interest-bearing checking account through such reputable companies as EverBank, Charles Schwab, E*Trade and ING Direct.

7. Pay an upfront fee for a mutual fund. Selecting no-load funds can save you more than the sales charges. Of course, no matter how well a fund has done in the past, you can't be sure how it will perform in the future. But if you pay a load, you'll begin the performance derby in the hole. See the Kiplinger 25 for some favorite no-load funds.

8. Pay too much in taxes on investments. Are you investing in a tax-sheltered 401k or Roth IRA? If you're not maxing out those accounts before you invest in a taxable account, you're spending too much.

9. Buy brand name instead of generic. From groceries to clothing to prescription drugs, you could save money by choosing the off-brand over the fancy label. And in many cases, you won't sacrifice quality. Clever advertising and fancy packaging don't make brand-name products better than lesser-known brands.

10. Waste electricity. Of the total energy used to run home electronics, 40% is consumed when the appliances are turned off. Appliances with a clock or that operate by remote are typical culprits. The obvious way to pull the plug on your energy vampires is to do just that -- pull the plug. Or buy a device to do it for you, such as a Smart Power Strip (from around $30 at SmartHomeUSA.com), which will stop drawing electricity when the gadgets are turned off and pay for itself within a few months.

11. Pay banking fees. Overdraw your checking account and you'll pay $20 to $30 a pop, so it pays to keep tabs on your balance. Plus, if you're still paying for a checking account, free deals abound -- but make sure they're really free. For instance, will the bank charge a fee if your balance drops below a certain level or if you download your information into a personal-finance software program? That's not free.

12. Buy things you don't use. This sounds like a no-brainer, but how many times have you seen something on sale and thought you couldn't pass it up? Even if something is 50% off, you're spending too much if you don't use it. Couponing, for instance, can be a great way to save on your grocery bills. But if you buy things you wouldn't have otherwise purchased just because you have a coupon, you're wasting money. The same goes for buying in bulk. A bargain is not a bargain if it sits unused on your shelf or gets thrown away.

13. Own an extra car. OK, so a car is a necessity for most people. But cars are a huge drain, with loan payments, insurance fees and gas and maintenance costs. Own more than one car and those expenses multiply. Ask yourself if that second or third car is really necessary. Are you holding on to an old car for sentimental reasons? Can you or your spouse carpool, take public transportation or bike to work?

14. Ignore your local dollar store. Shopping at the dollar store can be hit-and-miss, but it's not all kitsch or junk. If you know what to buy, you can find some real bargains. You can may be able to score deals on cleaning supplies, small kitchen tools, shampoos and soaps, holiday decorations, greeting cards, gift wrap, balloon bouquets and more.

15. Keep unhealthy habits. Smoking not only damages your health, it also burns up your cash. A pack-a-day habit at $6 a pack costs $2,190 a year. Junk-food or tanning-bed habits can be costly as well, even before the money you'll spend on medical bills down the road.

16. Be complacent about insurance. Your bill arrives and you pay it without a second thought. When was the last time you shopped around to determine whether you're getting the best deal? Rates vary widely from insurer to insurer and year to year. Rechecking prices on auto, home or renters insurance might save you hundreds of dollars.

It also pays to re-evaluate your insurance needs. For instance, upping your out-of-pocket deductible to $1,000 can save you 15% or more on your car insurance. Consider using the same insurer for your home and auto insurance; you could snag up to 15% off for a multiple-line policy. And make sure you're not paying for insurance you don't need. For instance, you need life insurance only if someone is financially dependent upon you (such as a child).

17. Give Uncle Sam an interest-free loan. If you get a tax refund each April, you let the government take too much money in taxes from your paycheck all year long. Put that money in your pocket -- and put it to work for you -- by adjusting your tax withholding. With a little discipline, you can use that extra cash each month to get started saving or pay down debt (or make ends meet to avoid going into debt in the first place). You can file a new Form W-4 (.pdf file) with your employer at any time.

18. Pay for something you can get for free. Dust off your library card and check out books, music and movies for free (or dirt cheap). Don't pay to receive your credit report when you're allowed to get it at no charge by law. Take advantage of kids-eat-free promotions. And dial 1-800-FREE-411 for free directory assistance.

19. Don't use a flexible-spending account. Your employer may allow you to set aside pretax dollars for medical costs not covered by insurance. You can use the money for expenses such as therapy, contact lenses, insurance co-payments and prescription drugs. The IRS provides a full list of qualified expenses here (.pdf file). You may be able to do the same for child-care costs.

You don't want to put away too much, because if you don't use all the money in your account by the end of the plan year, you lose it.

20. Pay for unnecessary services. How many cable channels can a person watch? Do you really need all those extra features for your cellphone? Are you getting your money's worth out of that gym membership? Are you taking full advantage of your subscriptions (such as Netflix, TiVo or magazines)? Take a look at what you pay for and what your family actually uses. Trim accordingly.

This article was reported by Erin Burt for Kiplinger's Personal Finance magazine.

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Liz Weston is the Web's most-read personal-finance writer. She is the author of several books, most recently "The 10 Commandments of Money: Survive and Thrive in the New Economy" (find it on Bing). Weston's award-winning columns appear every Monday and Thursday, exclusively on MSN Money. Join the conversation and send in your financial questions on Liz Weston's Facebook fan page.