Investopedia explains 'Previous Balance Method'
The interest you owe when you carry a credit card balance can be calculated in different ways and can vary from card to card. The cardholder agreement will state the method your credit card company uses to calculate how much interest is owed. The most common methods are the previous balance method, the daily balance method, the average daily balance method, the adjusted balance method and the ending balance method. If you carry credit card debt, you should choose a card with both a low APR and a favorable method of calculating interest based on your pattern of making purchases and payments.
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