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.

The feature is now implemented. We ask for the MER as that is simplest for users, but you can fudge it as you like if you want to make it higher to consider additional fees.