As a single member LLC, you are a disregarded entity for tax purposes, which means you will file your income and expenses on Schedule C as part of your personal return. There is a place on Schedule C to enter an LLC's Tax ID if the LLC has one. You can issue 1099s, and complete W-9s using your LLC's EIN, or your Social Security Number - for tax purposes it ultimately doesn't matter, unless and until the LLC has employees, and then MUST use a separate tax ID for payroll tax purposes. You have a tax ID for the LLC, you might as well use it. It will minimize your social security number floating around on various forms at clients, vendors, banks, etc.
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