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Why is the app applying tax on top of a price that is already inclusive of tax?

This happens when Shopify is not configured to treat product prices as tax-inclusive. GST Pro mirrors the tax data it receives from Shopify, so if Shopify treats prices as tax-exclusive, GST will appear added on top even if you intended the price to already include tax.

Most Common Root Cause

Tax-inclusive pricing is disabled in Shopify

The most frequent cause is that the Shopify setting "Include sales tax in product price and shipping rate" is not enabled.

  • Shopify treats the product price as a base price
  • GST is calculated in addition to the price
  • GST Pro reflects the same calculation on the invoice

When this setting is off, tax is added on top of your product prices.

Other Possible Causes

  • Tax-inclusive pricing applies only to new orders
  • Orders placed before the setting was enabled will still show tax added on top

Third-party checkout tools (for example, custom or accelerated checkouts):

  • May pass order data to GST Pro as tax-exclusive
  • This causes GST to appear added even when prices look inclusive on the storefront
  • If Tax Behavior is set to Invoice Only
  • GST Pro relies completely on Shopify's calculation
  • Reverse calculation for inclusive pricing is not applied

Why This Happens

GST Pro works like a receipt printer.

  • Shopify decides whether a price is:
    ○ "₹499 + GST" or
    ○ "₹499 total (GST included)"
  • GST Pro prints the invoice based on that decision
  • If Shopify is not told that tax is already included → the app assumes GST must be added on top

When tax-inclusive pricing is enabled, GST Pro performs a reverse calculation — splitting the final price into taxable value and GST amount, so the total remains unchanged.

How we Typically Resolve This

1

Enable tax-inclusive pricing in Shopify

Path: Shopify → Settings → Taxes and Duties
  • Enable "Include sales tax in product price and shipping rate"
  • Save the settings
2

Set GST rates inside GST Pro

Path: GST Pro → Products
  • Ensure correct GST percentages are entered
  • These rates are required for reverse calculation
3

Enable discount splitting (if discounts are involved)

Path: GST Pro → Settings → Taxes
  • Enable "Split order discounts to individual line items"
  • This ensures GST is calculated on the discounted price, not the original price

Important Dependencies & Limitations

  • GST Pro cannot change what a customer was charged at checkout

  • Shopify tax setting changes:

    ○ Apply only to new orders
    ○ Do not retroactively fix older orders

  • GST Pro depends entirely on Shopify's Order API

  • The app cannot override misconfigured Shopify tax data

What This Will NOT Fix

  • Incorrect tax added on already completed orders
  • Checkout-level tax display issues
  • Taxes calculated by third-party checkout apps

Related Questions

Why is the CGST and SGST split not appearing on the GST invoice for intra-state orders? Why is GST being calculated on the original price instead of the discounted value? Why is the app unable to generate reports for specific months? Why is the app counting total orders instead of actual prints towards the plan limit? Why is the HSN code added in the Shopify store description not appearing on the invoice?

Last updated: January 2026