GST-ready software does more than add 18% to an invoice. It should issue compliant tax invoices with the right GSTIN, HSN or SAC codes and place-of-supply logic, generate e-invoices and e-way bills when your business is required to, export clean data for GSTR-1 and GSTR-3B, help reconcile input tax credit, and keep an audit trail that cannot be switched off.
Use the checklist below whether you are evaluating an off-the-shelf billing tool, an ERP, or a custom system we or another developer would build for you. Tick what the software handles today, and treat every gap as a question for the vendor.
Why does "GST-ready" mean different things to different vendors?
Because many products only handle the tax calculation, not the compliance workflow around it. A tool that adds CGST and SGST to a bill is not the same as one that files cleanly at month end.
The gaps usually appear later: an inter-state sale taxed as intra-state, a missing HSN code that holds up a return, or invoices that never reached the e-invoice portal. Ask vendors to demonstrate each item on this list with your own sample transactions, not slides.
GST rules and thresholds are revised from time to time. Treat this as a feature checklist, confirm the current limits with your chartered accountant, and choose software whose vendor updates promptly when rules change.
Checklist 1: Does it create compliant tax invoices?
Every invoice must carry the mandatory details and calculate tax by place of supply. This is the foundation; if it is shaky, nothing downstream works.
| Requirement | What to check | Tick |
|---|---|---|
| Supplier and buyer GSTIN | Validates the 15-character format and ideally checks it against the GST system | ☐ |
| Sequential invoice numbering | Unique, consecutive numbers per financial year, within the permitted length, with separate series if needed | ☐ |
| HSN / SAC codes | Stored per product or service, printed on invoices at the level your turnover requires | ☐ |
| Place-of-supply logic | Applies CGST + SGST for intra-state and IGST for inter-state supplies automatically | ☐ |
| Multiple tax rates on one invoice | Handles mixed-rate line items correctly | ☐ |
| Reverse charge | Flags supplies where the recipient pays the tax | ☐ |
| Bill of supply | Supports composition-scheme or exempt supplies that cannot carry a tax invoice | ☐ |
| Credit and debit notes | Linked to the original invoice, with correct tax reversal | ☐ |
Checklist 2: Does it handle e-invoicing and e-way bills?
If your turnover crosses the e-invoicing threshold, invoices must be registered on the government's Invoice Registration Portal before they are valid. Software should do this without anyone copying data into a portal by hand.
| Requirement | What to check | Tick |
|---|---|---|
| IRN generation | Sends invoice data to the IRP and stores the Invoice Reference Number it returns | ☐ |
| Signed QR code | Prints the QR code from the portal on the invoice PDF | ☐ |
| Cancellation within allowed window | Cancels an e-invoice correctly and records why | ☐ |
| E-way bill generation | Creates e-way bills from the invoice for goods movements above the set value, with transporter and vehicle details | ☐ |
| Error handling | Shows portal rejections clearly so staff can fix and resend | ☐ |
| GSP / API connection | Uses a GST Suvidha Provider or approved API route rather than screen scraping | ☐ |
The government has lowered the e-invoicing threshold several times, so pick software that supports it even if you are below the limit today. Retrofitting e-invoicing into a system later is far more disruptive than switching it on.
Checklist 3: Will it make returns and reconciliation easy?
Good software turns month-end from a scramble into an export. Your accountant should receive data they can file from, not raw sales lists to rework.
| Requirement | What to check | Tick |
|---|---|---|
| GSTR-1 ready data | Outward supplies summarised by B2B, B2C, exports, credit notes and HSN, in a format your accountant or filing tool accepts | ☐ |
| GSTR-3B summary | Tax liability and eligible credit figures for the period | ☐ |
| Purchase register | Captures supplier GSTIN, invoice number and tax per purchase | ☐ |
| ITC reconciliation | Matches your purchase records against GSTR-2B and flags mismatches | ☐ |
| Inward invoice actions | Fits your workflow for accepting or rejecting supplier invoices on the GST portal's Invoice Management System | ☐ |
| TDS / TCS | Records tax deducted or collected at source where it applies, such as sales through e-commerce operators | ☐ |
Input tax credit is where money is quietly lost. If a supplier has not reported an invoice, you may not be able to claim the credit, so a mismatch report that runs every month is worth more than a pretty dashboard.
Checklist 4: Does it support how your business is structured?
Businesses with branches, warehouses or several registrations need software that treats each GSTIN properly. This is where many entry-level tools fall over.
- ☐ Multiple GSTINs under one account, with separate numbering and returns data per registration.
- ☐ Stock transfers between states treated as taxable supplies where the law requires.
- ☐ Export invoices with or without payment of IGST, and SEZ supplies.
- ☐ Multi-currency invoices for overseas clients, with rupee values for GST.
- ☐ Role-based access so branch staff see their own invoices, not the whole company's.
Checklist 5: Is the data trustworthy and auditable?
Your records must stand up to scrutiny years later. Indian company law requires companies' accounting software to keep an audit trail, an edit log of every change, that cannot be disabled.
- ☐ Edit log recording who changed what, and when, on every financial record.
- ☐ No silent deletion of issued invoices; cancellations and credit notes instead.
- ☐ Backups you can restore, stored securely, with a clear retention period.
- ☐ Data export in standard formats so you are never locked in.
- ☐ Personal data handling in line with the Digital Personal Data Protection Act 2023 for customer details stored on invoices.
Checklist 6: Does it connect to the rest of your stack?
GST data should flow from the place a sale happens to your books without retyping. Every manual hop is a chance for a wrong code or amount.
- ☐ Syncs invoices and payments with Tally, Zoho Books or your accounting package. Our comparison of accounting software integrations for Xero, QuickBooks and Tally explains the options.
- ☐ Pulls orders from your website or e-commerce platform automatically.
- ☐ Sends payment links and reminders. See invoicing and payments automation for service businesses for how that works end to end.
- ☐ Offers an API so future tools can connect.
Should you buy GST software or build it into a custom system?
Buy if your invoicing is standard; build GST features into custom software when invoicing is part of a larger workflow you already need built. Even then, connect to a GSP for e-invoicing rather than building that integration from scratch.
| Option | Typical cost (estimate) | Best for |
|---|---|---|
| Off-the-shelf billing or accounting tool | Annual subscription | Most small businesses with standard invoicing |
| GST invoicing module inside a custom internal tool | ₹1.5–5 lakh | Service firms whose invoices depend on jobs, milestones or bookings |
| GST-compliant billing inside a SaaS product or platform | Part of a ₹4–12 lakh MVP or larger build | Startups selling to Indian businesses |
These are typical ranges that vary with scope, plus maintenance of roughly 15–25% of build cost per year, which matters here because GST rules keep changing. If you are building a product for Indian customers, our guide on building B2B SaaS for the Indian market covers payments and pricing alongside GST. For how billing fits with CRM, ERP and automation, start with our guide to business systems that scale.
Frequently asked questions
Is GST-ready software mandatory in India?
There is no rule forcing you to use a particular product, but your invoices, records and returns must meet GST requirements. If e-invoicing applies to your turnover, you need a system that can register invoices with the IRP, which in practice means software or an approved API service.
Can small businesses below the e-invoicing threshold ignore it?
You can issue regular tax invoices for now, but it is wise to choose software that supports e-invoicing. Thresholds have come down before, and switching systems mid-year is painful.
Does Tally handle all GST requirements?
Tally supports GST invoicing, returns data and e-invoicing for many businesses. The common issues arise when sales happen in another system, such as a website or CRM, and data has to be moved into Tally by hand. An integration usually solves that.
What is a GSP and do I need one?
A GST Suvidha Provider is an approved intermediary that lets software connect to GST systems for tasks such as e-invoicing and return data. If you are building custom software, using a GSP is usually faster and safer than building those connections yourself.
How often should GST software be updated?
Whenever rules, formats or portal requirements change, which happens several times a year. Ask vendors how quickly past changes were released, and for custom builds, include GST updates in the maintenance agreement.
Want your billing checked against this list?
If your invoices start in one tool and end in another, we can review the flow and fix the gaps, or build GST-compliant invoicing into the system you already need. Request a fixed-price quote and we will start with your real invoices.