Tutorials

›

Video and written guide

GST, invoices and your legal details

▶

2:00

video

Chapters

Tap to jump

▶

Welcome

0:00

▶

Your legal details

0:10

▶

Your GST number

0:30

▶

Your invoice numbers

0:54

▶

Each product's GST rate

1:10

▶

See a real invoice

1:28

Prefer reading? The full guide with screenshots is below.

YOU WILL LEARN

✓

Legal name and address in Business details

✓

GST number and numbering in Tax and invoices

✓

A GST rate on each product

In this tutorial

+

An invoice is a legal document, so it has to be right. Set up your details once, and Opmiz fills in every invoice for you. At the end, each order gets its own invoice with your legal details and the GST worked out for you.

In the screenshots, Meera sets up invoices for Petal Street, a flower studio in Pune.

Open Settings, then Business details. As the page says, these details are used on invoices, emails and your site's footer.

  1. Business name: use the name your business is registered under.
  2. Registered address: your registered address. If you have already published your store, you gave it then. This is where you change it, with Edit.

Business details: the business name Petal Street, and the registered address 14 Baner Road, 411001 with its Edit button

Your GST number

  1. Open Tax and invoices.
  2. First, Registered for GST: if you are not registered, choose No. Meera is registered, so she chooses Yes.
  3. A GSTIN box appears. Type your GST number. The one in the video is a made-up sample.

Watch the Invoice preview on the right. It shows your invoice as you fill this in, with your GST number and the tax on a sample product.

Your invoice numbers

  1. Invoice number starts with: many businesses use their initials and the financial year. Meera types PS/26-27/, so her invoices read PS/26-27/1, PS/26-27/2 and so on.
  2. Make the invoice when: choose the moment Opmiz makes the invoice. Meera chooses Mark Shipped, so the invoice is made when an order is marked shipped.
  3. Below this there is room for a note, your bank details and a signature.
  4. Press Save when you are done.

Tax and invoices: Registered for GST turned on, a sample GSTIN, the prefix PS/26-27/, Make the invoice when set to Mark Shipped, and the invoice preview on the right

Each product's GST rate

The GST rate belongs to each product, because different products can have different rates. The rate in the invoice preview is only an example.

  1. Open a product's page and open Tax and fulfilment.
  2. Enter its HSN / SAC code and its GST rate. Your accountant can tell you the right ones for what you sell.
  3. Press Save product.

A product's Tax and fulfilment section: HSN code 0603, GST 5%, and the Save product button

See a real invoice

In the video, a customer, Aarav, orders the bouquet Meera just set up.

  1. In Orders, open the order.
  2. When it is packed, press Mark packed.
  3. When it leaves the studio, press Mark shipped. That is the moment Meera chose for the invoice.
  4. The invoice appears in the order under Documents. Press Invoice to open it.

The order after Mark shipped, with Invoice, Receipt and Change invoice date under Documents

The invoice shows your legal name and address, your own invoice number, the product's HSN code and GST rate, and the GST worked out from that rate.

The tax invoice: Petal Street's address, invoice number PS/26-27/1, the bouquet with HSN 0603 at 5%, and SGST and CGST of 2.5% each

From now on, every order gets one of these.

Try it on your own store

14 days free · no credit card

Was this tutorial helpful?

AI websites with native commerce. Pages, blog, store, payments and GST invoices in one place, built from a short description.

Start free for 14 days →

© 2026 Opmiz · WriterBabu Online Services Private Limited. All rights reserved.

Prices in INR, before 18% GST · Made in Patna, India

Cookies!

We use cookies for marketing, analytics, and improvements.

Chat