@Janie37 The sad news is, once AirBnB withholds US taxes from your payouts, there are only two ways to proceed: 1) file a US tax return and have the money they withheld returned to you, or 2) sue AirBnB for wrongfully withholding US taxes if they were not applicable to you.
AirBnB did not do what most legitimate organizations would do, and that is verify your tax status BEFORE withholding the tax. In my case, I work for an Icelandic company that has no tax or other presence in the US, not even a telephone number or post office box. No bank account either.
I contacted the IRS, and I was told the company had to file a US tax return to claim the funds. I said screw that.
I worked out an agreement where I will file this amount on a zero tax return in the US, and have the money returned to me, then I will return it to the company. The company in Iceland has already paid VAT and applicable income taxes on ALL AirBnB income here in Iceland, and the amount withheld in 2017 alone was several thousand dollars.
The reason the company is not filing a form 1120-F is because it would cost quite a bit for the company's accountant to create all the numbers needed for the form, and then they would have to pay a tax professional in the US to actually file the form. Like I said, screw that. Actually, I said something else, but proper decorum prevents me from stating exactly what I feel. 🙂