Absolute Amount is the specified per trade amount the client will be charged from which IBKR commissions are subtracted from. It is similar to Absolute Markup, but Absolute Markup is in addition to IBKR’s commissions whereas IBKR’s commissions are subtracted from Absolute Amount. In practice, this means the value entered by the broker should be greater than IBKR’s commission for the broker to capture any profit. Absolute Amount uses the Fee and Volume columns since brokers can set multiple tiers based on volume breaks on a per trade basis.