Which of the following actions is NOT recommended for maintaining a good credit score?

Maxing out credit cards is not recommended for maintaining a good credit score. Credit utilization refers to the percentage of a consumer's available credit that is currently being used. Higher utilization rates can signal to lenders that a borrower may be overextending themselves financially, which can negatively impact their credit score.

On the other hand, paying bills on time is crucial as late payments can have a significant adverse effect on a credit score. Keeping credit utilization low is also essential, as it is advised to use less than 30% of available credit to be viewed favorably by lenders. Regularly checking credit reports allows individuals to ensure that all information is accurate and can help catch any potential fraudulent activities that could harm their score. Thus, the action of maxing out credit cards stands out as detrimental to maintaining a healthy credit score.