Do you have a Tax Identification number?
In order to claim treaty benefits, you will need to provide your Tax Identification Number (TIN). This may be your US TIN, such as a Social Security Number (SSN), Employer Identification Number (EIN), or Individual Tax Identification Number (ITIN). If you do not have a US TIN, you may provide your Foreign TIN for your local country.
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Exit Interview
Do you have a TIN? *
It is not necessary to have a TIN in order to determine if you are a US person or non US person for U.S. income tax purposes. However any reduction of the standard withholding rate (30%) that may be available under Treaty will not apply until you can provide either your Foreign or US TIN.
If your local country does not use a TIN, you can:
* apply for an EIN, online with the IRS OR
* apply for an ITIN.
Additional information can also be found here.