The Benefits/Disadvantages of using a credit card
One of the more subtle disadvantages to large credit card purposes purchases (besides what the other answer mentions), is that it makes you less prepared for emergencies. If you carry a large balance on your credit card with the idea that your income can easily handle the payments to beat the no-interest period, you never know when you'll have an unexpected emergency and you'll end up having to pay less, miss the deadline and end up paying huge interest. Even if you are fastidious about saving and budgeting, what if your family comes under a large financial burden (just as one possible example)?