If you’re comfortable with Excel， expenses， inventory purchases， fees， refunds， the reply above is solid advice. I went down that exact path years ago -- built my own workbook with tabs for sales。

and eventually I turned that DIY spreadsheet into a more structured Excel-based software called Net Gain Seller (I’m the developer/owner). It’s essentially a ready-made version of whats being described here. Its designed specifically for tracking inventory， marketplace fees， and Profit and Loss without having to build everything from scratch. It stays local in Excel (no cloud or bank connections) and focuses on the reports most sellers care about -- profit and loss， sales，。

fees， item-level profitability， that’s another route to consider. ， shipping。

and a Profit and Loss summary. It works， postage， cost of goods， but it can get pretty complex and time-consuming as volume grows. I’m a long-time eBay reseller myself， and aging inventory. If you’re not keen on building and maintaining your own spreadsheet。