If not:

- How are they best handled? By lowering both the dividend yield and the capital growth amounts?

- Any possibility of adding another input field to account for them? 

All investment return yields should be entered net of fees.

We have not yet implemented a reporting feature for MER fees but the feature is planned for.

Awesome, thank you.  If/when it is implemented, please also include (or allow the user to enter): MERs, sales tax on MERs, TERs.  These stuff can add up, especially over the long term.