Most small businesses begin with a billing book or an Excel sheet, and that works until the invoices, stock and GST returns start to pile up. At that point, a single wrong tax rate or a missing e-way bill can cost more than the software would have. This guide explains what small businesses in India should know about GST billing software, which rules actually apply to them, and what to check before choosing a tool.

The rules described here are taken from official government sources, which are listed at the end. GST rules change from time to time, so confirm the current position on the GST portal or with your chartered accountant before you act on anything.

Who this matters for

Small businesses make up most of the economy. According to a Ministry of MSME reply in the Rajya Sabha, Maharashtra had about 53.56 lakh enterprises registered on the Udyam portal as of 29 January 2025, and about 52.37 lakh of them were micro enterprises. These are mostly shops, workshops, traders and small service providers. Their billing needs are usually simple, but they still have to follow the same GST rules as larger companies where those rules apply.

What a GST invoice needs to handle

Whatever tool you use, it should produce a proper tax invoice without manual calculation. That means the correct GSTIN, HSN or SAC code, tax rate, place of supply and the split between CGST, SGST and IGST. It should also number invoices in order and keep a record you can export for your accountant when returns are due.

E-invoicing: does it apply to you?

E-invoicing is a system where certain businesses report their invoice details to the government's Invoice Registration Portal and receive an Invoice Reference Number (IRN). It is not a separate type of invoice. It applies based on turnover.

Under Notification No. 10/2023-Central Tax, e-invoicing applies to registered persons whose aggregate turnover in any financial year from 2017-18 onwards has exceeded ₹5 crore. The change took effect on 1 August 2023. It covers supplies to other registered businesses and exports. Some categories of taxpayers are exempt even above the limit, so check the notification for your case.

If your turnover has always been below ₹5 crore, e-invoicing is not mandatory for you at present. If you are near the limit, plan ahead, because once you cross it the requirement stays. You can check whether a GSTIN is enabled for e-invoicing on the official e-invoice portal.

E-way bill: when you move goods

An e-way bill is an electronic document for the movement of goods. Under Rule 138 of the CGST Rules, it is generally required when the consignment value exceeds ₹50,000. It is generated on the e-way bill portal, and certain goods and situations are exempt. The GST Council's flyer on the electronic way bill explains who generates it and when.

For a trader, workshop or manufacturer sending goods regularly, it helps if the billing software can prepare the details for the e-way bill from the same invoice, so the data is not typed twice.

What to check in billing software

  • Does it handle GST invoices, credit notes and returns data correctly for your type of business?
  • Can it support e-invoicing and e-way bill details if your turnover or your goods movement requires them, now or later?
  • Does it track stock together with billing, or will you need a second tool?
  • Can you export your data in a usable format such as Excel or CSV?
  • Does it work on a phone, and can more than one person use it with separate access?
  • Who handles support, and how are rule changes updated in the software?

Off-the-shelf billing app or custom software?

A ready-made billing app is usually enough when you sell standard products and need invoices, stock and GST reports. Custom software makes sense when your process is different, for example job-based billing in a workshop, multiple price lists, approval steps or links with production and purchase records. Our post on custom ERP vs monthly ERP compares the cost and ownership side of this choice.

Common mistakes

  • Using one tax rate for everything instead of setting it per item.
  • Not checking turnover across all registrations under the same PAN when judging whether e-invoicing applies.
  • Keeping billing and stock in separate sheets that never match.
  • Choosing software on price alone and finding later that data cannot be exported.

Frequently asked questions

Is e-invoicing mandatory for a small business?

Only if aggregate turnover has exceeded the notified limit, currently ₹5 crore, in any financial year from 2017-18 onwards, and the business is not in an exempt category. Businesses below that limit are not required to generate e-invoices at present.

Do I need an e-way bill for every delivery?

Not for every delivery. The general rule applies when the consignment value is above ₹50,000, with exceptions and state-specific provisions. Confirm the position for your goods and route.

Can Kharigo build billing software for my business?

Yes. Kharigo builds custom billing, inventory and ERP systems, either as a one-time build or as a modular system you can start on a low monthly budget. We do not give tax advice, so confirm your GST obligations with your chartered accountant, and we can build the system around that.

Talk to us about your billing needs

If you are comparing billing tools or thinking about custom software, tell us how your business invoices customers today and where it goes wrong. You can read about our ERP software development service or contact Kharigo for a free consultation.

References

This article is general information and not tax or legal advice.