See the table below for a list of the current withholding rates. Alternatively, you can check irs.gov.
(with a valid treaty claim)
* Countries to which the US-USSR income tax treaty still applies: Armenia, Azerbaijan, Belarus, Georgia, Kyrgyzstan, Moldova, Tajikistan, Turkmenistan and Uzbekistan.
^ Reduced rates for royalty income types that are shown as special rates and conditions while filling in the tax form. If the reduced rates are not claimed, 30% withholding is applied.