The Aug 26 Shopify deadline will not break your checkout. It will break your conversion tracking, and you will not notice for two weeks.
On August 26, Shopify shuts off the Additional Scripts field on non-Plus stores. This applies to Basic, Shopify, and Advanced plans. There is no grace period and no warning banner when it happens.
Here is the part everyone is getting wrong: they’re bracing for checkout to break. It won’t. Orders will keep processing on the 26th, the 27th, and every day after. That’s exactly why this is dangerous. Nothing visibly fails, so nobody checks.
What actually lives in that Additional Scripts box, for most stores, is:
- Google Ads and GA4 conversion tags
- Meta and TikTok pixels
- Affiliate and postback tracking
- Custom fields, COD logic, or upsell scripts pasted in years ago and forgotten
When Shopify strips that field, every one of those stops firing. No errors, no failed orders, no customer-facing sign anything changed. Your dashboards just quietly go to zero on conversions while sales keep coming in. Ad platforms don’t know the difference between “no conversions” and “tracking is broken.” They optimize on whatever signal they’re getting, which after the 26th is garbage. Budget gets reallocated toward whatever’s still reporting, real or not.
Two weeks is roughly how long it takes for that to show up as a ROAS problem instead of a tracking problem, by which point you’ve already spent a few weeks of ad budget on bad signal.
One correction on the scope, because it’s easy to conflate: if you’re not on Shopify Plus, you never had checkout.liquid. That was always Plus-only. What non-Plus stores are losing is specifically the Additional Scripts field on the Thank You and Order Status pages, plus any app-installed script tags on those pages. If an agency is quoting you for a checkout.liquid migration and you’re not on Plus, that work doesn’t exist.
What to do this week:
- Go to Settings > Checkout in your Shopify admin. If there’s a yellow warning banner, click Review Customisations for the full list of what’s flagged. If there’s no banner, check the Additional Scripts field directly. Not every case triggers a warning.
- Inventory what’s actually running in there. Don’t assume you remember. Scripts pasted in two years ago by someone no longer on the team are the common case, not the exception.
- Sort each script into one of two buckets: covered by an official app pixel (Google, Meta, TikTok, Klaviyo all have these), or needs to move to Web Pixels under Settings > Customer Events.
- Migrate and test before the 26th. Place a test order and confirm the conversion event actually fires in Google Ads and GA4, not just that the pixel loaded.
Audit this week. Don’t wait for the ROAS report to tell you something’s wrong on the 27th.
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