I basically have no idea what I am doing when it comes to business taxes. TurboTax was asking me for info on my K-1, and I have no idea what that even is. I run my LLC all by myself so I do not run it as if there are multiple people. How do I go about filing an LLC if I run it by myself?
Turbo Tax Business is not available to do online or on a Mac. You can buy the Window's version here. And you can have both TT Business and TT Home & Business (or any personal version) installed on your computer at the same time.
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But you don't seem to be sure it's an S Corp. you probably should go to an accountant the first year to get started right. If it's not a S Corp and only a single member LLC you file it as self employment on schedule C in your personal 1040 return. You will need to use the Self Employed version .
You just enter it as a Self Employed Business on Schedule C. Just follow the directions for a "Business". Your State may have other requirements for an LLC (such as California), so keep a lookout in the State interview.
As a side note, if you are considering the S-corporation election, I REALLY, REALLY to NOT make the decision until you have gone to a tax professional to analyze your specific situation. Most small business owners like you do NOT being their business as a corporation. A corporation is A LOT more paperwork, requires A LOT more tax filings, and can be more expensive in some cases.