Selling online in India isn’t just about picking a platform and adding a payment button. The moment you start transacting, GST law treats you differently depending on how you sell — and getting the compliance layer wrong is one of the most common (and expensive) mistakes new online sellers make.
This guide walks through the three-part stack that makes GST-compliant selling actually work: the e-commerce platform, the payment gateway, and the accounting/invoicing system — and how to connect them so compliance happens automatically instead of becoming a monthly scramble.
Why GST Compliance Isn’t Optional for Online Sellers
A few rules catch most first-time sellers off guard:
- Registration is mandatory if you sell through a marketplace, regardless of turnover. Under Section 24 of the CGST Act, anyone selling through an e-commerce operator (Amazon, Flipkart, Meesho, etc.) must register for GST from day one — there’s no turnover exemption like there is for offline sellers. If you sell only through your own website, the standard threshold applies: ₹40 lakh for goods, ₹20 lakh for services.
- Every sale needs a GST-compliant tax invoice, carrying your GSTIN, the correct HSN/SAC code, and the applicable tax rate. Missing HSN codes is one of the most common reasons invoices get rejected or GSTR-1 filings show mismatches.
- Tax Collected at Source (TCS) applies when you sell through a marketplace. The operator deducts 1% (0.5% CGST + 0.5% SGST) of your net taxable sales and deposits it against your GSTIN — which you then claim back as input tax credit. TCS does not apply when you sell through your own branded store, since there’s no “operator” in between.
- E-invoicing becomes mandatory once your turnover crosses ₹5 crore in any financial year — at that point, every B2B invoice needs an IRN and QR code generated through the government’s Invoice Registration Portal before it’s valid.
None of this is handled by a single tool. It’s the combination of platform, payments, and books that keeps you compliant without manual reconciliation eating hours every week.
Step 1: Choose an E-commerce Platform That Can Actually Handle GST
Your storefront is where GST compliance either starts clean or starts messy. The two most common choices for Indian sellers are Shopify and Zoho Commerce, and they handle tax differently out of the box.
Shopify doesn’t generate GST-compliant tax invoices natively — it calculates tax at checkout, but turning that into a proper invoice with HSN codes, GSTIN, and the right tax breakup usually requires either a GST invoicing app from the Shopify App Store or a connected accounting system. Shopify is still an excellent platform for design flexibility and scale, but the GST layer needs to be configured correctly during setup — tax rates by state, HSN mapping per product category, and invoice templates all need attention before you go live. This is exactly the kind of setup a specialist shopify development company in kerala, India handles as part of store launch, rather than something to patch together after your first compliance notice.
Zoho Commerce, by contrast, is built inside the same ecosystem as Zoho Books — so GST-compliant invoicing, HSN/SAC code mapping, and tax rules sync natively without a separate app or workaround. If you’re prioritizing a straightforward compliance setup from day one, this native connection is a real advantage.
Either platform works — the point is that “GST-ready” isn’t a checkbox, it’s a configuration decision made at setup.
Step 2: Set Up a GST-Ready Payment Gateway
Once your platform is sorted, the payment gateway is the next compliance touchpoint — because every transaction fee your gateway charges also carries 18% GST, and that fee needs to be recorded correctly for you to claim input tax credit on it.
Razorpay is the most widely used gateway among Indian D2C sellers, supporting UPI, cards, net banking, and wallets, with domestic settlements typically completed within two working days. The compliance detail that trips up a lot of sellers: Razorpay’s transaction fee (roughly 2% for cards, ₹3–10 flat for UPI) plus 18% GST on that fee needs to be booked as a separate expense line against each settlement — not just netted off silently. Done manually, this becomes a 1–2 hour daily reconciliation task once you’re processing 50+ orders. Done correctly at setup, it’s automatic.
This is the kind of configuration a proper razorpay integration service sets up once — connecting the gateway to your platform and your accounting system so that settlements, fees, and GST on those fees all land in the right place without manual entry every single day.
Step 3: Automate Invoicing and Books with Zoho Books
This is where compliance either becomes automatic or stays a monthly headache. Zoho Books is the most widely used accounting platform among Indian e-commerce sellers specifically because GST isn’t an add-on feature — it’s built into how invoices, HSN codes, and returns are generated.
With Zoho Books connected to your store and payment gateway:
- Every order automatically generates a full GST-compliant tax invoice, with GSTIN, HSN/SAC codes, and the correct tax breakup, in a continuous invoice series
- Once you’re integrated with Razorpay, invoices carry a “Pay Now” link, and payments are auto-recorded against the correct invoice — no manual matching
- For businesses crossing the ₹5 crore e-invoicing threshold, Zoho Books can push invoices directly to the government’s Invoice Registration Portal (IRP) to generate the IRN and QR code automatically
- Monthly GSTR-1 and GSTR-3B data can be exported directly for filing, instead of being rebuilt from spreadsheets
Getting this set up correctly — the chart of accounts, tax rules by state, HSN mapping, and the connection to your storefront and payment gateway — is a one-time implementation project, best done right the first time. A certified zoho partner in kerala, India can configure this end-to-end, including migrating existing sales data and training your team on the reconciliation workflow.
Step 4: Connect Everything Into One Workflow
The real compliance win isn’t any single tool — it’s how they connect:
- A customer places an order on your Shopify or Zoho Commerce store
- Razorpay collects the payment via UPI, card, or net banking, and settles funds to your bank account within a couple of working days
- The payment event automatically triggers Zoho Books to generate a GST-compliant tax invoice and mark it as paid
- Gateway fees and GST on those fees are recorded automatically as a separate expense line
- At month-end, your GSTR-1 and GSTR-3B data is already reconciled and ready to export
Once this loop is set up, GST compliance stops being a task you do — it becomes something that just happens in the background of every sale.
Common GST Mistakes Online Sellers Make
- Not registering for GST before listing on a marketplace — remember, the marketplace threshold exemption doesn’t exist; you need a GSTIN from your first sale
- Missing or incorrect HSN/SAC codes on product listings, which causes invoice rejections and GSTR-1 mismatches
- Forgetting to reconcile TCS deducted by marketplaces against GSTR-2A/2B before filing returns
- Treating platform-generated invoices as sufficient without maintaining your own GST-compliant copies
- Ignoring the ₹5 crore e-invoicing threshold until it’s already been crossed, leading to invalid invoices
Which Setup Should You Choose?
If you’re already running (or planning to build) on Shopify, pair it with Razorpay for payments and Zoho Books for GST-compliant invoicing and filing — three best-in-class tools, connected together.
If you’d rather keep everything under one native ecosystem, Zoho Commerce paired with Zoho Books and Razorpay gives you the same compliance outcome with fewer moving parts to configure and maintain.
Either path works. What matters is that the platform, the payment gateway, and the books are set up to talk to each other from day one — not patched together after your first GST notice.
Disclaimer: This article is for general informational purposes and reflects publicly available GST rules and platform features as of mid-2026. GST regulations change periodically — always confirm current requirements with a qualified tax professional or the official GST portal before making compliance decisions for your business.
Submitted by: The Tech Geum team — www.techgeum.com
Tech Geum is a Kerala-based technology implementation partner helping Indian businesses build and run compliant online stores. The team works as a certified zoho partner in kerala, india, as a shopify development company kerala, india, and as a razorpay integration service provider — handling storefront development, payment gateway integration, and GST-compliant accounting setup end to end.
