I also didn't separate my business and personal bank accounts for a long time which made keeping track of income and expenditure really hard. (inspiringwit.com)
If you had to pay these expenses out of your own personal bank account then you could find yourself in debt. (rentersinsurance.net)
Just take one month's of expenses from your main personal bank account and your credit card, and just see where the money has gone in the past. (hoyes.com)