WOTC Certificates are good for 20 years! It's important to meet all the deadlines and get your hands on your WOTC Certificate for future use. Even if you don't receive it in time to use against your tax liability this year, you can use it whenever you need to in the future. So go ahead and pile them up! They will certainly come in handy when your accountant delivers your tax bill in 2014 and beyond.