Yes, a point-of-sale machine can help with your accounting because it tracks sales data. However, it does not replace accounting software. Most point-of-sale machines will track price, inventory, gross revenue, and sales, but will not create the financial reports you will need such as a balance sheet, income statement, etc..[i]
[i] Investopedia. Investopedia, n.d. https://www.investopedia.com/