Positive settled cash balances held in the securities segment of accounts with NAV>100k earn the stated interest rate and those with NAV<100k earn a proportional rate.
https://www.interactivebrokers.com/en/accounts/fees/pricing-interest-rates.php
当前的 rate 是 4.83%
可是，做 futures 的资金好像是没有 interest 的
Cash held in the commodities segment of an account does not earn interest.
IB 的 account 看上去是一个 combined account：
- Trade securities and futures in a single account. Many brokers require you to create separate non-linked accounts for securities and futures trading. IBKR's Integrated Investment Management Account links your securities and commodities account segments in one account.
- https://www.interactivebrokers.com/en/trading/u-account.php
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