The real costs of investing abroad

Foreign investing has more cost layers than a domestic trade. Knowing them prevents nasty surprises and lets you compare routes fairly.

The cost stack for Path 2 (account abroad)

• Câmbio spread — the gap between the rate you get and the true market rate, paid on the way out and on the way back.
• IOF on the foreign-exchange operation — rate and rules subject to change; verify currently.
• Trading commissions at the broker (many now offer commission-free stock/ETF trades, but confirm).
• Currency-conversion spreads inside the broker when switching currencies.
• Fund expense ratios — the annual cost baked into any ETF or fund you hold.
• Custody / inactivity / withdrawal fees — small individually, meaningful on a small or dormant account.
• Withholding tax on foreign dividends, deducted at source abroad.

The cost stack for Path 1 (BDRs on B3)

Much lighter on the FX side — no remittance, no IOF on câmbio — but you still face brokerage costs, wider spreads on illiquid BDRs, and any fees embedded in the depositary program. The convenience trades off against menu and sometimes pricing.

The lesson

Always reason in all-in cost, not headline commission. A "zero-commission" foreign trade can still cost you through a wide câmbio spread and a high fund fee. Add the layers up before deciding which route — and which product — is genuinely cheaper for your situation.