In general, it isn't a good idea to mix business and personal funds in your QuickBooks Desktop company file. It can create a tax-time nightmare to sort everything out. The IRS recommends opening business-only banking accounts for any new business. In QuickBooks Desktop, make your checking and credit card accounts business-only accounts.
However, even when you do maintain separate business and personal banking accounts, you may occasionally need to pay for business expenses out of your own pocket. When this happens, you need to record the transaction in QuickBooks Desktop to correctly account for the expense.
Important: These procedures apply only to personal expenses incurred by owners or partners. Reimbursing an employee is handled differently in QuickBooks.