Hi Marcel,
Thanks for your question. Unfortunately, we're not accountants/lawyers either, so we are not allowed to provide you with any specific tax or legal advice. We can provide some general guidance, but everyone's situation is different, and you should consult with your accountant and/or lawyer for specific advice pertaining to your case. In general,
1. You say that you have a SSN - are you a US resident? The W8BEN instructions (http://www.irs.gov/pub/irs-pdf/iw8ben.pdf) state: "You are a U.S. citizen (even if you reside outside the United States) or other U.S. person (including a resident alien individual). Instead, use Form W-9, Request for Taxpayer Identification Number and Certification, to document your status as a U.S. person."
2. You should fill out Section II if you are a resident of a country that has a tax treaty with the US and you are claiming special tax treaty benefits. Again, we can't advise you on whether this section applies to you. The W8BEN instructions include a link to existing tax treaties, so you can look them up if you think this applies to you.
3. The remaining 80% will be transferred to you within 90 days unless it is subject to FATCA withholding (see our Developer FAQs for details). Whether or not this 80% would be subject to income taxes in your country is subject to the tax laws of your country. In general, it could be taxed in your country since it is considered to be income.
Sincerely,
jc
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