How a credit card cycle works
The whole system runs on one billing cycle. Learn these few terms once and the rest of CardLab, along with your real statements, starts to make sense.
Grace period · interest-free if paid in full
Day 1
Statement date
Your bill is calculated and the balance is frozen.
Days 2 to 24
Grace window
New purchases stay interest-free, as long as you pay in full.
Around day 25
Due date
Pay the statement balance to keep grace alive.
Start with the two dates that matter most:
Every term, in one place
The two key dates
- Statement date
- The bill generation date is this date: the day your bill is calculated, also called the closing or cutoff date. Everything up to this day is totaled into a “statement balance,” and your reported utilization is usually measured here too.
- Due date
- The deadline to pay your statement. Pay at least the minimum to stay current; pay the full statement balance to keep your purchases interest-free.
- Grace period
- A credit card grace period is the interest-free window on new purchases. You keep it only if you paid your last statement balance in full by its due date.
- Pay before statement close
- Paying before the statement date and paying by the due date solve different problems. A payment that posts before the statement closes can lower the balance that is typically used for reported utilization. Paying the statement balance in full by the due date is usually what keeps the interest-free grace period alive.
What you owe
- Statement balance vs. current balance
- Your current balance is everything you owe right now. Your statement balance is the amount frozen on the cutoff date, and it’s the number interest and “pay in full” are based on.
- Minimum payment
- The smallest amount you can pay to stay current. It’s designed to be small, often mostly interest and fees.
- Credit limit & utilization
- Your limit is the most you can borrow. Utilization is your balance ÷ limit, usually measured at the cutoff. Lower is generally seen as healthier.
What it costs
- APR & interest
- APR is the yearly interest rate. CardLab applies it with the average daily balance method: a daily rate is charged on each day’s balance, then added up across the cycle.
- Cash advance
- Borrowing cash against your card. It usually has an upfront fee, no grace period, and a higher APR, so interest starts on day one.
- Rewards vs. interest
- Cashback, points, and miles are real value, but only if interest and fees don’t erase them.
- Bonus caps
- A bonus cap is a hard limit on how much spending earns the elevated rate in a category, or across rotating categories, for a period - often a month or a quarter. Once that spend is used up, further purchases in the same category usually earn the card's base rate, not the headline bonus.
How rates are checked
- How rates are verified
- CardLab does not copy rates from comparison sites. A figure reaches the app only if it can be tied to a sentence on the issuer's own public product page, with a link to that page and the date it was read. A claim that cannot clear that bar is rejected by the build and never ships.
Tools that use these terms
The definitions above are the inputs. The credit card tracker holds the dates, which card to use applies them to a purchase, and the credit card calculators turn a balance into months and interest.