When you say "incorporated company", what <i>type</i> of company is it? This is a consequential difference in the US, as C-corps are treated differently than S-corps and LLCs, which might be pass-through entities.<p>If you have a C-corp, and it has US-source income, you need a tax professional, and you will likely spend most of that income on their services. Sorry.<p>If you have an LLC, the pain-minimizing steps is to fill out a personal tax return with a Schedule C-EZ attached to it. Write the revenue number on the schedule C-EZ. Normally you'd calculate expenses for the business and subtract them, but understating your expenses is not a crime, so save yourself the hassle and just write 0 for all of them. I'm assuming you're asking this question because you're not physically in the US and this company is your sole US-source income, so when you flow that number to the places the Schedule C and 1040-EZ tell you to put it, you'll find that you have 0 tax due. Sign return, mail in, keep copies of the return and documentation of that income number for 6 years.<p>If you don't want to have to read instructions, TaxAct is fairly decent SaaS for uncomplicated returns, and should be able to handle a simple LLC filing. I used it for rather substantially more complicated returns for 7 years prior to getting a real accountant. I think it will run you about $15.<p>Depending on where the company is incorporated and how it earns its income, you may have to file state income taxes. You may also have to pay state/local taxes or fees. If any of this is news to you, talk to an accountant.