The exact amount of your cash advance fee depends on the amount of your advance and the method your credit card issuer uses to calculate the fee. Most credit card issuers charge either a flat fee or a percentage of the cash advance amount, whichever is greater. For example, a typical cash advance fee is the greater of $10 or 5%. So, if you take out a cash advance of $100 under these terms, your cash advance fee would be $10 since 5% of $100 is only $5.