Cash advances come with fees and typically have higher interest rates than the interest rate for purchases. The cash advance fee can be charged as a percentage of the cash advance. The percentage charged usually between 2% and 4%. Some card issuers charge a flat fee regardless of the amount of your cash advance.
Cash advances don't have a grace period, meaning interest begins accruing on the balance as soon as you borrow it. You'll always pay a finance charge on a cash advance even if you pay it in full when your billing statement comes. To reduce the amount of interest you pay on a cash advance, pay it as soon as possible, even before you are billed for it.