It depends on the type of return you are filing. If you are filing a personal return and reporting a Schedule C on your return, the business may have a different Tax ID number or EIN. This is perfectly acceptable and will not affect your own tax return. As you prepare your schedule C, you will be asked if the business has its own Tax ID number.
If you are filing a business return in the name of the disregarded entity or DBA, then the return is filed in the name of the business with it's tax id number (TIN). Then as a result of the filing, a K-1 is issued to you in your name to file your own personal tax return with your own social security number.
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