The social security number will be part of the template. It will provide the company everything it has to know about the employee. If he has an outstanding warrant of arrest from the police, if he is an outstanding debt, what responsibility he has, what violations he did, etc.
You have definitely been through number of form filling request especially in the forms and membership sites. Most of the web sites store some personal information about the users. When operating your own web business you must have thought of doing so. Its very true that forming these forms is boring and time consuming. But what about creating these web form templates? Does it take huge time to create professional templates for your users? Well, the answer is definitely_ NO.