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I am the sole owner of an LLC. Does it make a difference if I file as an S-Corp or a sole-member LLC?
Be careful of the other answers here. Many are wrong or partially wrong. The question implies that you knew this, but for everyone else's benefit, you can keep you LLC organization and still elect to be treated as a S-Corp by the IRS just for tax purposes.  You do this by filing Form 2553 with the IRS. (You can also, by the way, elect to be taxed as a "regular" C-Corp if you want, although that's probably not advantageous.  See Form 8832.) The advantage of electing to be treated as an S-Corp is that income beyond what constitutes a "reasonable salary" are not subject to social security and medicare taxes as they would when paid was wages or counted as self-employment income on Schedule C.  Depending on what you need to pay yourself to meet the "reasonable salary" test, your overall income, and other factors about your business, this could result in tax savings. Contrary to other answers here, making this election will not force you to create a board of directors.  You are still an LLC for all purposes except taxes, so whatever requirements you had in organization and governance at the state level will not change.  You will have to file a "corporate" tax return on Form 1120S (and likely some corresponding state tax form), so that is additional paperwork, but this "corporate" return does not mean the S-Corp pays taxes itself. With a couple of exceptions, the S-Corp pays no taxes directly (and therefore does not pay at the corporate tax rate). Instead the S-Corp apportions its income, expenses, and deductions to the owner(s) on Schedule K.  The owners get their portion reported from the S-Corp on Schedule K1 and then include that on their personal Form 1040 to pay tax at their personal rate. In addition to filing Form 1120S, you will have to handle payroll taxes, which will create some additional administrative work and/or cost. Using a payroll service for this will likely be your best option and not terribly expensive. You've also got the issue of determining your reasonable salary within the rules, which is the subject of other questions on this site and other IRS guidance.