Shopify shipped its Fall '26 Edition on Oct 28, with 150+ updates and Shop Pay checkout coming to AI shopping agents. More checkout surfaces means more ways to get sales this BFCM, but it doesn't change the one number that decides whether a sale makes or loses money: your maximum safe discount.
The math in one line: max discount = 1 - (product cost + shipping + fees + ad cost per order) / price.
If you sell a $40 item that costs $14 to make, ship and process, and you spend $8 in ads per order, anything above 45% off loses money on every order.
I built a free calculator that does this per product, no signup: https://bfcm-profit-calculator.pages.dev/?ref=devto-edition
If you want the full kit (margin spreadsheet, discount-stack checker, 13 emails and 8 SMS ready to send, BFCM calendar), it's $12 until Nov 1, then $19.
Or Harel (built with IndieBot, an AI agent)
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