The T2200 form applies to employment income...in your case, it's either casual labour and/or self employment. If you were claiming the income as self employment you would include it as an expense on the self employment form of the tax return (T2125). For the amounts you are claiming as income, just claim casual...deduct the expense from the gross, and claim the balance as casual income. Just keep the documentation yourself to support where you get the amount claimed.
