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| Average
Daily Balance Method |
What It Is:
A method of calculating interest by considering the balance owed or invested at
the end of each day of the period rather than the balance owed or invested at
the end of the week, month, or year.
The frequency of interest compounding affects how lenders and borrowers use the
average daily balance method. If interest compounds monthly, then borrowers and
lenders use the following formula to calculate interest under the average daily
balance method:
(A / D) x (I / P)
Where:
A = the sum of the daily balances in the billing period
D = number of days in the billing period
I = annual interest rate
P = number of billing periods per year (usually 12)
If interest compounds daily, then lenders and borrowers calculate the
interest on each day’s ending balance and add this interest to the next
day’s beginning balance. Note that ending daily balances reflect the day’s
charges, payments, deposits, and withdrawals in both versions of this method.
See the examples below.
How It Works/Example:
Let’s assume you have an XYZ Company credit card that uses the average daily
balance method and charges an 18% annual rate of interest. Below is the
transaction history for the most recent billing period.

If XYZ Company compounds interest monthly, then the interest charges for the
period are:
($25,100 / 30) x (0.18 / 12) = $12.55
However, note that if XYZ Company compounds the interest daily, it calculates
the interest due at the end of each day and adds that to the next day’s
beginning balance, as is shown in the following table:

Notice that daily compounding generates more interest and leaves the borrower
with a higher balance at the end of the billing period. The difference is more
pronounced the higher the balance owed. Also notice payments lower the
outstanding balance immediately in both cases, which lowers the interest accrued
on the remaining balance.
The average daily balance method doesn’t just apply to debt; investors are
well served to understand how an institution’s choice of interest-calculation
methods affect the amount of interest deposited into the investor’s account.
Why It Matters:
The average daily balance method is just one way lenders and borrowers can
calculate interest (the Truth in Lending Act describes acceptable methods). For
example, interest calculated using the average daily balance method is usually
lower than interest calculated under the previous balance method, which
applies interest to the last period’s balance. However, the average daily
balance method tends to create higher interest charges than the adjusted
balance method, where interest based on the period’s ending balance.
Because of the variety of interest calculation methods out there, borrowers
should compare lender offers and investors should compare investment offers by
carefully reading the disclosure accompanying those offers. Depending on the
anticipated activity, the borrower might save money and the investor might make
more money by preferring one calculation method to another.
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