You can even login to TJX account from your mobile using their app by the name T.J.Maxx. It can found on both Android and iOS as well. Install the app and once you open it you will have to enter your account user id, password to continue.You can pay your TJ Maxx credit card bill online by visiting TJX login page from here https://tjx.syf.com/login/ and then enter your User ID, password to login. Pay Tjmaxx Credit Card Under the credit card payment select the card you want to pay and enter the amount, then click on pay now to complete your TJMaxx credit card payment for the credit card online. You can even do the same using the mobile app by going to Credit Card > Pay Now and complete your credit card bill.