Stop commingling! No matter how new or small your business is, you will save yourself many headaches by keeping your personal and business income and expenses separated by different checking accounts and credit cards. This is especially important if you have a day job and a business on the side. This takes the guesswork out of wondering what credit card charges are business-related. For your business checking account, you can loan funds from personal checking account to get you started and as income comes in you put all business-related sales income into that account. For business purchases (office supplies, marketing, etc) use only your designated business credit card. Then you download all your business expenses and track them by category. I just started using Wesabe and you can tag expenses similar to how you use account names in Quickbooks.