Basically it depends on how you set your LLC up.  LLCs are really legal entities, not tax entities.  When you setup your LLC, you can choose to be taxed as a sole proprietor, partnership or corporation.  If you choose corporation, you can choose to be a C-Corporation or an S-Corporation.  It’s a little more complicated than that, but you get the idea.

If you are a sole proprietor when you setup your LLC, then most likely you will continue to be taxed as a sole proprietor.

As a sole proprietor, you are subject to the self employment tax, which is 15.3% of your net profits.

For more information on the self employment tax, please visit these resources:

Self Employed Taxes on the IRS website
Your Top Online Biz Tax Questions Answered

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