Recording deposits correctly is important.  You are likely to make a variety of deposits in your account throughout the year.  From loans, to sales revenue to cash transfers from your personal accounts.  If you cannot account for where each of the deposits have come from you are leaving yourself open...

When paying by debit or credit card, make sure that you staple a copy of the transaction slip to the actual receipt.  The Interac or credit card copy itself is not a valid receipt.  When paying your invoices, record on the receipt portion how it was paid and the date...