Goal: build a Shopify app that replaces Shopify’s checkout tax calculation with an in-house tax API.
Current constraint: a respondent states there is no public Shopify API to override checkout tax calculations. Shopify’s “Tax Service” integration appears available to select providers (e.g., TaxJar), not generally open to other developers.
Clarification requested: more details on the use case to assess feasibility.
Possible workaround: consider using tax overrides. These are Shopify settings to manually adjust or exempt taxes by product/region, but they do not provide a full custom calculation engine at checkout.
Key need: the poster wants taxes on the checkout page to be calculated via their own API instead of Shopify’s built-in engine.
Status: no confirmed method provided to plug a third-party tax engine directly into checkout. Discussion remains open; next step suggested is exploring whether partial needs can be met through tax overrides.
Notes: no images, videos, or code snippets are central to understanding this discussion.
Hi everyone,
I’m developing a Shopify app that utilizes our existing tax calculation service. This service provides accurate tax calculations through its API.
I haven’t found specific examples regarding integrating a custom tax calculation service like mine.
Are there any best practices or recommended approaches for building a Shopify app that leverages a third-party tax calculation API?
Unfortunately there isn’t an API. As far as I know Shopify has a Tax Service option they’ve opened up to Services like Tax Jar.
Nothing opened up for other devs.
We at GST Pro has been looking for the same thing for so long
I’m planning to develop an app that utilizes our in-house API for tax calculations.
Can you further explain your use case? Maybe its doable via tax overrides?
We are a sales tax solution provider, which developing public apps and plugins for different e-commerce platforms for our customers who need more features. Anyway, we need to know how to override tax calculation in Shopify checkout page to make sure tax would be calculated by using our APIs instead.