Total Cost of Investing Abroad: FX + Commission + Tax + Platform Fees
The true cost of investing in foreign markets has four components: FX conversion cost, commission on each trade, platform/custodian fees, and withholding tax on dividends. Most investors only see the commission. Here's the full picture — and how to minimize each component.
The four cost layers
- FX conversion: 0.1% (IBKR) to 2% (retail banks) on every buy and sell
- Commission: $0–$10 per trade depending on broker and asset class
- Platform fee: 0% (IBKR, Trading 212 for basic accounts) to 0.45%/year (HL, Fidelity UK)
- Withholding tax: 15–30% on dividends depending on the country of the stock and your tax treaty
Withholding tax: often overlooked
US companies withhold 30% tax on dividends paid to non-US investors by default. If your country has a tax treaty with the US (UK, India, Australia, Singapore all do), the rate reduces to 15% — but you must file Form W-8BEN with your broker to claim it. Without filing W-8BEN, you overpay 15% withholding tax on every dividend indefinitely.
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ForexFee guides are based on publicly available information and live rate data from Wise's comparison API. For pricing, KYC requirements and current promotions, always check each provider's official site. See our methodology for how we source and rank rates.