Correct, you can't deduct expenses from this income.
US citizens are required to pay self-employment tax on income from international organizations when the income is earned within the US.
As a contractor once you're a citizen, you can deduct expenses against your income to reduce your self-employment tax.
However, if your terms change and you become an employee of the international organization, you must pay self-employment tax on the income earned within the US, but you would not be allowed to deduct expenses.
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