This is product education, not legal or tax advice. Your outcome depends on tax residency, asset type, treaty eligibility and local rules.
W-8BEN
Non-US individuals generally use W-8BEN to certify non-US status and treaty information. It commonly affects withholding on US-source dividends and other US-source income.
Capital gains and dividends are different
Many non-US investors focus on whether ordinary stock capital gains are withheld by the US. That question is separate from dividend withholding, PTP rules, REIT income, estate tax, options and local tax obligations.
CRS is information exchange, not a tax bill
The Common Reporting Standard is a framework for financial account information reporting and exchange. It does not by itself calculate your tax, but it can affect what information financial institutions collect and report.
Why keep IBKR statements
Good records help you reconcile dividends, withholding tax, realized gains, cost basis, fees, FX conversion and account value. IB Dashboard turns IBKR XML/Flex Query exports into cleaner long-term records.