Laravel 12 Tutorial #116 | Tax / GST Management | Integrate Product-Level Tax (GST)

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Welcome to Part 116 of Laravel 12 Multi-Vendor E-commerce Series, where we’re building a complete, professional Multi-Vendor E-commerce Website from scratch.

In this part, we will implement product-level tax (GST) in the Laravel 12 Multi-Vendor E-commerce series.

We will calculate GST per product, add product_gst and product_gst_amount to order items, save the order taxes total, and display the tax breakdown on the checkout page, admin order details, and my-orders.

✨ Step-by-Step Implementation

1) Migrations — add columns

Create migration for orders and order_items. Two small migrations (or one combined) — paste and run php artisan make:migration then replace file content with below or create two files.

Migration A — add taxes to orders
File: database/migrations/xxxx_xx_xx_add_taxes_to_orders_table.php

Migration B — add product_gst and product_gst_amount to order_items
File: database/migrations/xxxx_xx_xx_add_gst_to_order_items_table.php

Run migrations:
php artisan migrate

2) Model updates — fillables
Add new attributes to Order and OrderItem so they can be mass-assigned.

3) Compute taxes on checkout — expose in cart
We will calculate GST per item and total GST inside CheckoutService::getCartForCheckout() so the view (and PayPal preview) can show them.
File: app/Services/Front/CheckoutService.php

Note: We keep subtotal as product totals pre-tax; taxes_total is shown separately.

4) Save taxes when creating order (createOrderFromCart)
File: app/Services/Front/CheckoutService.php

5) Update checkout view to show tax line
File: resources/views/front/checkout/index.blade.php — find the right column where you show Subtotal / Discount / Wallet / Shipping.

6) Show taxes in Admin Order detail & My Orders
A — Admin order details (resources/views/admin/orders/show.blade.php)
In the Order Items table header, add columns for GST percent and GST amount (or extend each row).
B — My orders / frontend order details
Same idea — wherever you show order items and totals, add those two columns/lines.

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