i love that quote "the temptation to quit will be greatest just before you are about to succeed"

However.....

you may want to give her a small salary and dividends to get round paying the higher tax bracket on all your net profit. then she can just give you the money back.

look into income splitting to get around paying loadsa tax

well it's a more tax efficient option for your friend....He will claim a dividend through is Limited company which is not subject to NI contributions.