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If he has a federal tax ID number for his business and the checks have been made out to the business as well, the 1099 should match that.
I suggest that he call the issuer of the 1099 and request that they make right the error. It may just be a simple mistake that they can quickly fix.
Let me know if you have more questions.
Since he filled out his W4 and used his social security number, he will have to file it on schedule C as self employment income. He should ask for a new W4 so he can use his EIN for 2005 if he plans to do any more business with this company.
If he is a sole proprietor, the IRS requires that the name and identifying number be the person's name and SS#.