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The IRS makes things easy by allowing you to use your Social Security number to report business income and expenses. However, if you want to separate your business and personal affairs, you can apply for a fictitious business name, also called a “doing business as” or DBA, and an employer identification number (EIN) for the business.
To obtain an EIN,
Go to the IRS website. Click on the “Apply for an EIN Online” link. Use the electronic system to apply for an EIN for your sole proprietorship.
Fill out the online application. The system asks you to identify a reason for applying for an EIN for a sole proprietorship. Selecting “to open a bank account” is one of the most basic reasons, since sole proprietorships that have an EIN often set up a business bank account with it.
File the form electronically with the IRS. Filing is free, and the system gives you your EIN immediately after transmission. Alternatively, you can apply for an EIN by mail or fax using IRS Form SS-4.
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