Have you ever been in your favorite store with a cool new pair of jeans, a new t-shirt, and a slew of other clothes in hand, ready to pay when the cashier says, "If you open a store credit card account with us today you'll get 10% off your purchase?" At that moment you consider how great it would be to have a credit card at your favorite store — without having to pay for that $500 charge right away.
Before you decide to sign up for that store credit card, you might want to consider that typical annual percentage rates (APRs) on credit cards from a retail store are about 23%. Ouch!
If you are able to pay off your purchases right away, the percentage rate might not matter to you (just remember the possible effect on your credit). But, if you think that paying a little bit each month is more your style, you should see if the savings will be worth it. To do that, you'll need to know how your rate is calculated. ![]()
Let's break down what a 10% savings at the register for a $500 purchase looks like in one month:
- Figure your average daily balance.
Add balances each day (purchases minus payments) and divide that by the number of days in the billing period. We'll use 30 days for this example. Say you make no additional purchases or payments for the first 15 days, and then on day 16 you make a $50 payment and on day 21 you make a $75 purchase. So your balance was $500 days 1-15, $450 days 16-20, and $525 days 21-30. - Calculate the interest. After you have the average daily balance, you can find out how much interest you'll pay that first month. Take your APR divided by 12 to find out how much interest you're charged each month. Then take that number times your average daily balance.
Here's the math:
23% APR divided by 12 = Monthly rate of .019166
.019166 x $500 = $9.58 interest charge - Was the savings worth it? Back to your original sale: You saved $50 at the register (10% of $500), but after a month on your store credit card, you owe $9.58 on the balance. That lowers your savings to $40 after the first month. And unless you pay off the remaining balance, those savings will continue to drop.
Here's the math:
($500 x 15 days) + ($450 x 5 days) + ($525 x 10) = 15,000
15,000 divided by 30 days in the billing period = $500 average daily balance
While I am an advocate of using credit when it makes sense, I'm highly in favor of knowing what my rates are and what it will cost me in the long run. It's easier to make better choices when you know exactly what that retail therapy
will cost.

When you're fresh out of college, it can be difficult to find the money you need for the basics (like rent, utilities and your student loan payment), let alone adding in a budget category for dresses, tux rentals and gifts. It can be a bit overwhelming. At first I was definitely wondering 

But through this tragedy I learned a valuable lesson: If you are able, do it yourself.


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