I have a separate business checking and savings account at a local credit union. I can download transactions from the website into an Excel sheet, which I do once a month and then categorize expenses and revenue. Everything goes in and comes out of that account for my business so it’s all in one place. Although I do deduct part of my phone and internet bill as a business expense, but pay out of my personal account, so that I manually enter into Excel each month. I’m in my third year of this and haven’t had an urge to buy Quickbooks or any other accounting software but my business is really uncomplicated, too. Then at the end of the year I use those monthly spreadsheets to tally one profit and loss statement for the year for my tax accountant.