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Paying taxes on income earned in the US, but from a company based in Norway
I don't see why you would need an "international tax specialist". You need a tax specialist to give you a consultation and training on your situation, but it doesn't seem too complicated to me. You invoice your client and get paid - you're a 1099 contractor. They should issue you a 1099 at the end of the year on everything they paid you. Once you become full-time employee - you become a W2 employee and will get a W2 at the end of the year on the amounts paid as such. From your perspective there's nothing international here, regular business. You have to pay your own taxes on the 1099 income (including SE taxes), they have to withhold taxes from your W2 income (including FICA). Since they're foreign employers, they might not do that latter part, and you'll have to deal with that on your tax return, any decent EA/CPA will be able to accommodate you with that. For the employer there's an issue of international taxation. They might have to register as a foreign business in your state, they might be liable for some payroll taxes and State taxes, etc etc. They might not be aware of all that. They might also be liable (or exempt) for Federal taxes, depending on the treaty provisions. But that's their problem. Your only concern is whether they're going to issue you a proper W2 and do all the withholdings or not when the time comes.