Last verified 2026-07-15
shopify discount codes stacking unexpectedly
Stacking codes erase margin on paid traffic before you notice. Kill combine-able legacy discounts, then re-test checkout with two codes.
The actual problem
Multiple active percentage codes combine at checkout and erase margin on paid traffic.
Do this
- List every active discount in Shopify Admin → Discounts.
- Flag any code with value ≥10% that allows combining.
- Disable legacy seasonal codes still marked Active.
- Re-test checkout with two codes; confirm rejection or single-apply.
Tools for this job
- Tillkiln
Automated scan for stacking + dead links
Scan the live storefront for stacking, OOS-buyable, and dead links before you blame ads → tillkiln.com.
- Shopify Discount Docs
Official combine rules
Related intents
Scan the store before more ad spend
Tillkiln finds checkout and storefront leaks — stacking discounts, OOS still buyable, dead collection links — with a rough $ leak estimate.
Also from Cashkiln
- Tillkiln — scan checkout leaks before you buy more ads
- Netkiln sample — client-ready revenue-health page from a payouts CSV ($19 clean unlock)
- Free leak checklist — six operator checks
Deep-dive report — $29
Self-serve checklist expansion for this query family. PayPal Checkout. No call.