Document, Document, and Document! The following for every expense:
1. Date, Primary Purpose of Expense, Description, Vendor, and Amount
A. Connect your business bank account with QuickBooks Online to easily record and document every transaction
2. Save receipts for expenses of $75 or more
A. Take a picture of the receipt and e-mail them to an "expense" gmail accounts (just for receipts)
3. Reconcile your business bank account at the end of the month to make sure you properly recorded every expense
A. You can automatically reconcile your bank accounts with QuickBooks Online