Skip to content 
How It Works
Once your Form 8802 is processed and approved, the IRS will issue Form 6166. This document serves as evidence that you are a resident of the United States for tax purposes.
Benefits of Using Form 6166
- Tax Treaties: Form 6166 can help you claim benefits under tax treaties between the U.S. and other countries. For instance, it may allow you to benefit from reduced withholding tax rates on income sourced from the foreign country, such as dividends, interest, or royalties.
- Avoiding Double Taxation: It helps to prevent double taxation by allowing you to claim a foreign tax credit or an exclusion for taxes paid to a foreign government on income that is also taxed by the U.S.
Important Considerations
If you are a tax resident in the foreign country where you are living (for example, if you reside there for more than 183 days), you may still be subject to local taxes on your worldwide income.
Form 6166 does not exempt you from paying taxes in the foreign country; it only certifies your U.S. residency status. You will still need to comply with the tax laws of the country you are residing in.
Summary
Form 6166, “Certification of U.S. Tax Residency,” is issued by the IRS to certify that an individual or entity is a resident of the United States for purposes of claiming benefits under an income tax treaty.
While Form 6166 itself does not exempt you from paying taxes overseas, it can be used to claim treaty benefits, such as reduced withholding rates or exemption from certain foreign taxes, in countries that have a tax treaty with the U.S. . The foreign tax authorities may require Form 6166 as proof of U.S. residency before granting treaty benefits. However, if there is no applicable treaty or if the income does not qualify under the treaty provisions, Form 6166 will not prevent foreign taxation.
