The form confirms that the contractor isn't a U.S. citizen and isn't working within the United States. If both of these things are true, the contractor isn't subject to American taxes. Without this form, you must withhold 30% of your payments to foreign contractors for taxes.
To choose the deduction, you must deduct foreign income taxes on Schedule A (Form 1040), Itemized Deductions. To choose the foreign tax credit, you generally must complete Form 1116 and attach it to your Form 1040, Form 1040-SR or Form 1040-NR.
How to Report Foreign Income. If you are a U.S. citizen or U.S. resident alien, you report your foreign income on your tax return where you report your U.S. income. That is, on line 1 of IRS Form 1040.
Federal Withholding Tax and Tax Treaties In most cases, a foreign national is subject to federal withholding tax on U.S. source income at a standard flat rate of 30%. A reduced rate, including exemption, may apply if there is a tax treaty between the foreign national's country of residence and the United States.
Since the beginning of 2019, any person engaged in doing business in Puerto Rico and paying for rendered services to another person must deduct and withhold 10% for income tax.
If, in the course of a trade or business, an entity pays compensation of more than $1,500 during the calendar year to a nonresident contractor for personal services performed in North Carolina, that entity must withhold North Carolina tax at the rate of 4% from the compensation.
Choosing a credit or a deduction To choose the deduction, you must deduct foreign income taxes on Schedule A (Form 1040), Itemized Deductions. To choose the foreign tax credit, you generally must complete Form 1116 and attach it to your Form 1040, Form 1040-SR or Form 1040-NR.