Be at the pains of putting down every single item of expenditure whatsoever every day which could possibly be twisted into a professional expense and remember to lump in all the doubtfuls.
Beware of little expenses. A small leak will sink a great ship.
You're biggest expense is the money you don't make.
— Pante
When your OUTGO exceeds your INCOME then your UPKEEP will be your DOWNFALL.