In what currency is interest charged or credited?

IBKR calculates and pays interest on cash balances in accounts as follows:

Interest Eligibility and Rates:…

Interactive Brokers (IBKR) has specific minimum balance requirements and policies for earning interest on cash balances. These requirements vary based on currency and account type:

1. General Requirements:
   • No interest is paid on the first USD 10,000 (or equivalent in other currencies) of cash in your account…

For more information on the interest paid on cash balances, please review the webpage for Interest Paid on Idle Cash Balances.

Please Note…

There is no difference in trading commissions in between cash accounts and margin accounts.

More information on trading commissions and interest paid on idle cash balances and charged on margin loans…