Originally Posted by Hwaldh
if I might run into any problems when claiming this invoice (which will be around 100k USD) as a business expense (because the invoicing party is off-shore).
No not at all; As a self employer, as you can see, you can write off your legitimate business expenses to help lower your tax burden. Keep track of your expenses and save you need to your wire transfer receipts , contract agreement or etc and deduct them at tax time. List your expenses on Sch C, along with income from your self employment work.