When should you not close a credit card account?

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I know that the best way to stop using credit cards is to close the account. If the credit is not easily available then it is more difficult to use. Do you know of any times when it is a bad idea to close an account. I know that having too much available credit can harm your credit rating but if you have alot of credit card debt than closing accounts with high credit limits but no balances can actually lower your credit score. One of the factors in your credit score is how much debt you have versus available credit. If you get rid of the availables and still owe alot than your ratio of debt to available become very high and it will lower the score. Are there any other circumstances where closing a credit card account might not be a good idea?