If I start an LLC, and the only employee currently is me, should I file it in MA or a different state?
You would not be an employee of your LLC. Instead, you would be a member of your LLC. You would report your LLC’s activity on Schedule C with IRS Form 1040 (assuming you will be the sole owner of the entity). All of your gross profit would be subject to self employment tax. If your are going to do business (as an operarting business) in Massachusetts, it makes sense for you to establish your business in Massachusetts. You may want to consider establishing your business as an S corporation (assuming you are a US citizen). By doing so, you would have to prepare and file annually IRS Form 1120S. You would have to pay Massachusetts annually $456. However, you would be able to massage (minimize) the self employment tax. You may want to consult with a combination attorney/CPA.