When using the Recurring Investment feature if you do not hold the currency the stock is denominated in, IBKR will auto-convert currencies to complete the trade.
Additional Information
What happens if I do not hold the currency the stock is denominated in?
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Which securities are eligible for recurring investment?
Will I receive whole shares or fractional shares?
Can I trade multi-currency products in my IRA account?
What are the tax considerations associated with Recurring Investment?