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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?
I'm assuming that when you say "convert to S-Corp tax treatment" you're not talking about actually changing your LLC to a Corporation. There are two distinct pieces of the puzzle here. First, there's your organizational form. Your state, which is where the business is legally formed and recognized, creates the LLC or Corporation. "S-Corp" doesn't come into play here: your company is either an LLC or a Corporation. (There are a handful of other organizational types your state might have, e.g. PLLC, Limited Partnership, etc.; none of these are immediately relevant to this discussion). Second, there's the tax treatment you receive by the IRS. If your company was created by the state as an LLC, note that the IRS doesn't recognize LLCs as a distinct organizational type: you elect to be taxed as an individual (for single member LLCs), a partnership (for multiple member LLCs), or as a corporation. The former two elections are "pass through" -- there's no additional level of taxation on corporate profits, everything just passes through to the owners. The latter election introduces a tax on corporate profits. When you elect pass-through treatment, a single-member LLC files on Schedule C; a multiple-member LLC will prepare a form K-1 which you will include on your 1040. If your company was created by the state as a Corporation (not an LLC), you could still elect pass-through taxation if your company qualifies under the rules in Subchapter S (i.e. "an S-Corp"). States do not recognize "S-Corp" as part of the organizational process -- that's just a tax distinction used by the IRS (and possibly your state's tax authorities). In your case, if you are a single-member LLC (and assuming there are no other reasons to organize as a corporation), talking about "S-Corp tax treatment" doesn't make any sense. You'll just file your schedule C; in my experience it's fairly simple. (Note that this is based on my experience of single- and multiple-member LLCs in just two states. Your state may have different rules that affect state-level taxation; and the rules may change from year to year. I've found that hiring a good CPA to prepare the forms saves a good bit of stress and time that can be better applied to the business.)