Withholding Tax
Tax a country deducts at source from dividends or interest paid to a foreign investor before the money reaches you.
What it is
Withholding tax is an amount a paying country automatically subtracts from investment income, such as dividends, before it is sent to an investor in another country. The standard US rate on dividends paid to foreigners is 30%, but tax treaties reduce it; under the Canada-US treaty the rate on US dividends paid to Canadians is generally 15%. The investor receives the income net of this deduction.
Why it matters
Withholding tax directly lowers your real dividend yield on foreign stocks, and the impact depends on what account you hold them in. A key pitfall for Canadians is that the 15% US withholding on dividends is waived inside an RRSP (a retirement account) but is not recoverable inside a TFSA (a tax-free savings account), so account choice changes your after-tax return.
How it's calculated
It is the applicable treaty or statutory rate multiplied by the gross dividend or interest amount, deducted by the payer before you are paid.
How Quintarthai uses it
Quintarthai shows dividend yield in the Summary key-metrics grid on each stock's company page; that figure is the gross yield before any withholding tax your account may incur.