GST inclusive pricing

Is it possible to add a toggle to turn on GST inclusive pricing?

For example, I quote a client $800 for session, but then for their invoice I have to manually break it down to be $727.27 and then do the 10% GST on top. Having it just say $800 (including $72.73 GST) would be much cleaner

Where it gets really messy is if I've also done a discount because it does the discount as excluding GST also. For example if I've done $200 off a $1600 package it actually only looks like a $181.82 discount on the invoice in order to get the total right as $1400.

Thanks!