Short answerA credit card lets you borrow money up to a limit and pay it back later. Pay the full statement balance by the due date and you pay no interest on purchases. Carry a balance and interest accrues daily on what you owe. Your payment history feeds your credit score.
How a credit card works
The card issuer sets a credit limit based on your application. Each purchase draws from that limit, and each payment restores it.
Every month the issuer sends a statement with your balance, minimum payment, and due date. The billing cycle is the period that statement covers: roughly one month.
How interest works
APR stands for annual percentage rate. It is the yearly cost of borrowing. Most issuers divide the APR by 365 to get a daily rate, then apply that rate to your average balance each day.
Interest accrues daily, so a balance grows a little every single day it sits there. Cash advances and balance transfers carry separate rates, higher than the purchase rate.
Why paying in full matters
Most cards have a grace period on purchases. Pay the full statement balance by the due date and you owe no interest on those purchases.
Carry any balance and the grace period disappears. New purchases then start accruing interest immediately, from the day they post.
Paying only the minimum keeps the account current but shrinks the balance slowly. The rest of the balance keeps accruing interest.
How cards connect to your credit score
Your credit history is a record of how you handle borrowed money. On-time payments build that record. Late payments damage it.
The share of your limit you use also matters, so a maxed-out card drags on your score. Carrying a balance does not help your score. Paying on time does.
Talk it through
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Christian Brinkley, Greensboro, NC, (919) 408-6671