If you don’t pay your credit card bill for a particular month, you become delinquent on your account, and will be assessed a late fee, even if you are just one day late.  If you miss a second payment (which will put you at 30 days delinquent), you be assessed another late fee.  Additionally, at this point your credit card issuer will report you as being late to the three major credit bureaus, which will begin to negatively impact your credit score and affect your ability to get approved for other credit cards and/or loans.  After your late status is initially reported, your credit card issuer will continue to report your delinquency to the credit bureaus, once a month, until you bring your account back to current.