Do I have to use my first name on my Social Security Card?

I have just joined a company with the business rule for email accounts of using the employee's first name. This is communicated as a Sarbanes Oxley compliance issue. In 20 years of business, everyone knows me by my middle name and all previous email accounts and other communications have reflected this. Will the SSA allow me to obtain a card without my first name? If so, payroll can correct my profile and the email address can be revised.
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Your legal name will be shown on the card. Additionally, when you file your tax return, if it does not match the name on your Social Security card, you will get a letter from the IRS to straighten the matter out with SSA. The W-2 forms issued by your company must match the signature on your tax forms. So you can either legally change your name to your middle name, or change your payroll records at work. Also make sure all 1099's from bank interest match your Social Security card.

Hope this helps.
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Unfortunately with things like social security cards, social insurance numbers, birth certificates, and other pieces like health cards etc., need to have your full legal name on it. Just talk with your employer and say that you're uncomfortable using your first name on the email. I don't think that they will be able to change it, but if they do, just explain the situation, and I am sure that they would be able to assist you. There is always a way, some employers may not be as loose as others are with changing policy for one person, but there are some people out there that are willing to assist you! Good luck!:)
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Your SS card MUST have your full legal name as a matter of law. They will not even process your application for a card if it does not have your legal name on it.
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No, you have to have a first name on it.