A 673 is a form that you would file with your US employer to claim an exemption for US tax withholding if you expect to pay foreign taxes in the country where you are now working. If you are a self-employed contractor, you would not file a 673.
If the country where you are working has a tax treaty with the US, you may claim a foreign tax credit for the amount you paid to the country where you are now working. Please review this IRS link for more information regarding the Foreign Tax Credit.
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