0% Intro APR on Balance Transfers and Purchases for 18 months when you sign up for the Citi Simplicity MasterCard. If you are paying off a credit card debt or making a big ticket purchase, this card can save you a considerable amount of interest. Balance transfers do charge a 3% transfer fee (or $5, whichever is greater), the standard rate for this kind of offer. Annualized over 18 months, the 3% fee at 0% interest works out to around 2%, which is a big difference from normal credit card rates. After that, the variable APR will be 12.99% - 21.99% based on your creditworthiness. There are no late fees and no annual fee.