It would be very useful to report on the fees per account, especially when multiple accounts can have widely different fee structures (think discount broker vs. flat fee advisor vs. broker with a combination of assets under management + fee per transaction).

This could be either completely standalone (i.e. another tab like holdings/income) or have the option to display 'net income' (i.e remove the fees from the income) in the income tab.

A separate table of the top accounts for fees (like top dividends per source in the income tab) would be good to identify the accounts with the highest fees.