I built a native macOS app to do my quarterly BAS with OpenCode

For the last 15 years I have been selling Antenna Mate on the App Store, and every quarter that means submitting a Business Activity Statement (BAS) to report on my Goods and Services Tax (GST) obligations (Paying our tax is important!) . My workflow has largely been the same. Download invoices from App Store Connect, gather business purchases, paste everything into a spreadsheet, calculate GST,…