How to Calculate Accrued Interest on Credit Card

Accrued interest is the interest that has been earned but not yet paid on a credit card balance. It's calculated based on the daily balance and the card's interest rate. Understanding how to calculate accrued interest helps you manage your credit card debt more effectively.

What is Accrued Interest?

Accrued interest is the interest that accumulates on your credit card balance between billing cycles. It's calculated daily based on your average daily balance and the card's interest rate. This interest is added to your next statement and becomes part of your total balance.

Accrued interest is different from finance charges. Finance charges include both the accrued interest and any fees associated with the interest calculation.

Key Points About Accrued Interest

Accrued interest is calculated daily based on your average daily balance
It's added to your statement when the billing cycle ends
The interest rate used is typically the card's APR (Annual Percentage Rate)
Accrued interest compounds over time if not paid off

How to Calculate Accrued Interest

The basic formula for calculating accrued interest is:

Accrued Interest = (Average Daily Balance × Daily Interest Rate) × Number of Days

Step-by-Step Calculation

Determine your average daily balance for the billing period
Find the daily interest rate by dividing the annual percentage rate (APR) by 365
Count the number of days in the billing period
Multiply the average daily balance by the daily interest rate
Multiply the result by the number of days to get the accrued interest

Most credit cards use a 30-day month for interest calculations, even if the actual month has 31 days. This is called the "30-day rule."

Example Calculation

Let's say you have a credit card with a 20% APR. Your average daily balance for the month was $1,500, and the billing period was 30 days.

Step 1: Calculate the Daily Interest Rate

Daily Interest Rate = APR ÷ 365 = 20% ÷ 365 ≈ 0.0548% or 0.000548 (as a decimal)

Step 2: Calculate the Accrued Interest

Accrued Interest = ($1,500 × 0.000548) × 30 ≈ $2.51

This $2.51 would be added to your statement as part of the total finance charges for the month.

When is Interest Accrued?

Interest accrues on your credit card balance from the date of each purchase until the date the statement is closed. Here's how it typically works:

Interest starts accruing from the date of each transaction
It continues to accrue until the statement is closed (usually around 25 days after the billing date)
If you make a payment during the billing cycle, it may reduce the interest accrued
Interest is calculated based on your average daily balance for the period

Some credit cards may have different interest accrual periods or offer promotional periods with 0% APR. Always check your card's terms and conditions.

Frequently Asked Questions

How often is accrued interest calculated on a credit card?: Accrued interest is typically calculated daily based on your average daily balance.
Is accrued interest the same as finance charges?: No, finance charges include both the accrued interest and any fees associated with the interest calculation.
Can I avoid accruing interest on my credit card?: Yes, by paying your balance in full each month before the interest accrual period ends.
Does accrued interest compound?: Yes, if you don't pay off the balance, the accrued interest will compound over time.
How can I track my accrued interest?: You can use our calculator to estimate your accrued interest or check your credit card statement.