PCI DSS stands for Payment Card Industry Data Security Standard, it is the worldwide standard that was set up to to help businesses (merchants) process card payments in a secure manner and reduce card fraud. If you do not complete the online self assessment your merchant service provider will start to charge you a monthly penalty.
When was the last time you looked closely at your Merchant Services statement? If you have not completed your online PCI-DSS self assessment then the chances are that you supplier will be charging you a non-compliance fee every month. And usually the longer you leave it the higher this fee will be. Look at you last bill and see if you are being charged, and if you are go on line and fill out your PCI-DSS Self assessment and start saving money now.