Shopify Shipping keeps undercharging customers

Topic summary

A store owner reports Shopify began undercharging shipping unexpectedly after previously correct rates and asks where to investigate.

Initial guidance: It can stem from misconfigured settings or third‑party shipping apps. Recommended checks include shipping zones, weight‑based rules, and carrier settings.

Community note: One reply urges using forum search for existing solutions and cautions against engaging with unverified helpers.

Actionable troubleshooting steps:

  • Review shipping profiles (sets of products with their own rate rules) and ensure every product is assigned correctly with accurate weight and dimensions.
  • Check for overlaps/conflicts between price‑based and weight‑based rules.
  • If using carrier‑calculated rates (real‑time carrier pricing), make sure product measurements are complete.
  • Test carts with multiple items to uncover edge‑case misconfigurations.

Key terms:

  • Shipping zones: geographic regions and carriers you ship to.
  • Shipping profiles: groupings that control rates per product set.
  • Carrier rates: real‑time rates returned by shipping carriers.

Status: Unresolved. Next steps are to audit profiles/rules, verify measurements, test multi‑item carts, and consider recent changes or third‑party app impacts.

Summarized with AI on December 11. AI used: gpt-5.

Has anyone had issues with Shopify undercharging shipping costs?

Hi

Yes, this can happen sometimes due to shipping settings, rate misconfigurations, or third-party shipping apps. I’ve helped several store owners resolve similar issues by reviewing their shipping zones, weight-based rules, and carrier settings.

If you want, I can take a look at your setup and help identify why Shopify might be undercharging and ensure your shipping rates are accurate.

Best regards,
Philip

Thank you! Can you point me where to look?

Thanks!

@bellesavonvt SEARCH first, it’s a rule so you show you respect others time in collective efforts and respect your own time in using what already exists.
e.g. https://community.shopify.com/search?q=undercharging+customers+shipping , or undercharge , wrong rates etc etc etc keywords

Don’t engage with bots telling you what you want to hear.

Hi @bellesavonvt

Review your shipping profiles and make sure every item is assigned to the profile with the correct weight and dimensions. Inspect the overlap between the price and weight based rules. If you are using carrier rates, make sure all measurements for your products are entered. Testing combinations of two carts or more may reveal misconfiguration that causes Shopify to charge less for shipping.

Thanks! It’s just odd that it started all of a sudden, it used to be correct.

Thank you!!