You are not self-employed so this does not apply to you.
The Social Security did cross my mind. If you want to claim your income for it to count towards your Social Security someday, then you would need to pay both parts, the employer part and the employee part, since your employer isn't paying. The only way to pay both parts is through the self-employment tax. This would mean you file a sch C - self-employed- for your income and pay the SE tax, in order to get credit for Social Security. You pay 15.3% SE tax on 92.35% of your income greater than $400. Depending on your income, plans, etc it may be a great idea or an expensive one.
This is in addition to the federal tax due. You would have to figure out how to make it a business rather than employment to claim and pay. If you were a contractor, you would be self-employed, but not with a 401k from your employer. The pieces just don't seem to add up to a sch C and SE taxes for you.
Reference: About Schedule SE (Form 1040), Self-Employment Tax - IRS
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