I've seen a lot of talk about the evils of credit cards; I put this hand-in-hand with the general "money is evil" and/or "money is the root of all evil" arguments. None of these assertions are true.
A Usage Issue, Not a Moral Dilemma

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. Money isn't evil, neither is it the root of all evil (don't believe me?
read it yourself); money is simply a tool which can be used well or badly. Credit cards fall into the same category. Use them responsibly, and you can accomplish good things with them. Use them unwisely and irresponsibly, and you'll get yourself in a lot of trouble. (As it turns out, guns fall into the same "tools" category; what you do with them determines whether they produce good or bad results.)
A credit card can be a great financial tool. It can help you increase your credit score, simplify your bill-paying, and get some free perks. It can also get you in a lot of trouble, so the key is to treat your credit card like cash; don't use it for purchases if you can't go to the bank and withdraw the cash to make the same purchase.
Increase Your Credit Score
Pay Off Your Debt
If you need to get your credit score up a bit, credit cards can help. You need to pay off any outstanding credit card debt, first; you'll actually get a larger credit score increase from paying off a credit card than from completing car or mortgage payments. So be sure you're on a good route to paying off your credit card debt. Use a debt reduction calculator to figure out how long it will take you, and pay faithfully. If you get some extra money or a raise, try to pay more on your credit cards.
Keep Old Accounts, and Not Many of Them
Don't keep a lot of open credit cards. Open lines of credit, even if unused, affect your credit score negatively and can also discourage lenders from approving your loan for a car or a house. So keep only a couple of open credit cards; the older, the better.
Pay Your Monthly Bills with a Credit Card
Choose one credit cards as your monthly bill-paying card. You'll need to have online banking set up to make this work out best; most banks offer online banking at no charge now. If your bank doesn't, ask them, or switch banks to one that does. Set up automatic monthly bill payments with your credit card, and then use your online account to pay off the balance on your credit card once or twice a month. Your credit score increases as you bring that balance down at 0.
Key: Don't use the credit card for anything other than monthly bills, and always pay the balance off in full. Otherwise you'll just be accumulating more credit card debt, and that doesn't help your credit score at all.
Simplify Your Finances
Use Balance Transfers

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If you have multiple credit cards that need to be paid off, then search for a good deal on balance transfers and low or no interest on those transfers. Open up a card and transfer all your credit card balances to that card, then continue to pay as much as you were previously (or more, if you can) on the total amount. If you can get a good deal on the interest, and avoid balance transfer fees, you might end up saving money you would have lost to higher interest rates; plus it will be much simpler to pay one credit card bill rather than several.
Consolidate Your Bill Paying
As mentioned above, if you use a credit card to pay your monthly bills, you can then simply go in and pay off that credit card balance once or twice a month. The key is setting up automatic payments for your bills from your credit cards; if the payments are automatically taken from your card, you don't have to worry about being late on them. All you have to remember to do is pay off the credit card balance each month.
Get Free Perks and Buying Power
Gain Rewards/Incentives
Most major credit cards offer perks - rewards, points, cash-back incentives - to get people to buy more. Don't buy more, just keep using your credit card as your main bill-paying mechanism, and you can still gain those rewards. You can rack up free gift cards, gas cards, and other goodies if you use one credit card consistently. If you want to gain more rewards, you could use a rewards card for your current cash purchases, like food, gas, and entertainment. You'll need to be sure, though, that you don't go over your normal cash budget, and then you transfer that cash from your checking account to pay off the purchases made on your credit card.
Key: Staying within your budget and treating the credit just like it is cash.
Make Larger Purchases at 0% Interest
This isn't something that's good to do often, because it's how people get into debt-trouble. Too much debt. But say your water heater or washing machine breaks down, you can't realistically live without one for the six months it will take you to save up for one; the store offers a payment plan but charges interest. Here's what you do instead; you open a credit card that's offering 0% interest for the first six months (or eight, or ten, or four; be sure you know the terms. Then you put the large item on your new credit card and proceed to pay off the amount you would have saved every month until you were able to purchase it.
Key: Be sure that the purchase will be completely paid for before the interest-free period ends; if you go over by a day, you'll likely be paying interest for the entire purchase.
Negatives of Credit Card Use
Easy to Lose Sight of What You've Spent
Yeah, something about the feel of that last twenty dollar bill leaving your hands tends to make your feel it. It's not the same when you swipe a card. If you don't have self-control or find it impossible to remember how much you've purchased, then don't use a credit card for purchases just to gain rewards. It's only worthwhile if you stay within your cash budget and pay off your balance, in full, every month. If you can't do that, skip the credit card and stick to the cash.
Finance Charges, Late Fees, and the Like
If you use a credit card well and pay the balance off regularly, you won't have to worry about late fees. You'll probably still be hit with the occasional finance charge, however; if using a credit card isn't helping you by increasing your credit score, simplifying your life, or giving your rewards, then the finance charge isn't worth it.
Confusing Terms/Increasing Interest Rates
Beware the increasing interest rate! Never, never, never use the cash advance your credit card company will offer you. You will pay for it many times over. And don't make a balance transfer without getting clear on the fees and the interest rate. Using a credit card requires the ability to read through some fine print and sort it all out.
Bottom Line
Credit cards are tools. If you have knowledge and vigilance to use them for your financial benefit, they can help you in many ways. Keep it simple and set up a system - which you use diligently - to know your balance, stay within your budget, and pay off your credit balance regularly. Don't make large purchases you can't pay off quickly. Don't use credit cards as spending cash. Use them as tools, which, like many other tools, can be dangerous if used improperly. If used wisely, they can help you meet your financial goals.
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