If you do not make your payment on time, most credit cards will immediately hit you with a steep late fee. Once you are 30 days late, you will likely be reported to the credit bureau. Late payments can have a big, negative impact on your score. Once you are 60 days late, you can end up losing your low balance transfer rate and be charged a high penalty interest rate, which is usually close to 30%. Just automate your payments so you never have to worry about these fees.
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Here is a simple test. (This is not 100% accurate mathematically, but it is an easy test). Divide your credit card interest rate by 12. (Imagine a credit card with a 12% interest rate. 12%/12 = 1%). In this example, you are paying about 1% interest per month. If the fee on your balance transfer is 3%, you will break even in month 3, and will be saving money thereafter. You can use that simplified math to get a good guide on whether or not you will be saving money.
Making your credit payments on time is one of the biggest contributing factors to your credit scores. Some banks offer payment reminders through their online banking portals that can send you an email or text message reminding you when a payment is due. You could also consider enrolling in automatic payments through your credit card and loan providers to have payments automatically debited from your bank account, but this only makes the minimum payment on your credit cards and does not help instill a sense of money management.