What Is Withholding Tax?
Withholding tax is a mechanism by which a payer (such as a corporation or financial institution) deducts tax from income before distributing it to the recipient. In Japan, dividends and interest from listed securities are subject to a flat 20.315% withholding rate (15.315% national income tax including the reconstruction surtax, plus 5% local inhabitant tax). For foreign investors receiving Japanese dividends, the withholding rate is typically 15-20% depending on applicable tax treaties.
Cross-Border Withholding and Treaty Benefits
When Japanese investors hold U.S. stocks, the U.S. withholds 10% on dividends under the Japan-U.S. tax treaty (reduced from the statutory 30%). Japan then applies its own 20.315% on the gross dividend, creating potential double taxation. The foreign tax credit allows Japanese residents to offset the U.S. withholding against their Japanese tax liability, but the credit is capped and requires filing a tax return. On a $10,000 annual dividend, failing to claim the foreign tax credit costs roughly $1,000 in unnecessary tax.
Key Considerations
Holding foreign dividend-paying stocks inside a NISA account eliminates Japanese tax but does not eliminate foreign withholding, because NISA cannot override another country's tax law. This means U.S. dividends in a NISA account still lose 10% to U.S. withholding with no Japanese credit to offset it. For tax efficiency, consider whether accumulating (reinvesting) funds that avoid distributing dividends might be preferable to distributing funds when investing internationally.