A service business can look small in one city and still become GST-sensitive once it starts billing clients across States. The hard part is not just the turnover threshold — it is understanding where the supplier is located, where the recipient is located, whether the supply is inter-State, and whether any compulsory-registration rule overrides the normal threshold.
GST registration is not decided only by one turnover number. The first filter is aggregate turnover under the PAN, the second filter is the State from which supply is made, and the third filter is whether any compulsory-registration trigger applies. For many service providers, the practical threshold is ₹20 lakh in a financial year, with lower thresholds in specified States. Exclusive suppliers of goods may get a higher threshold in many States, but that benefit should not be applied to mixed suppliers, service-heavy businesses, or cases covered by compulsory registration.
| Situation | Broad registration trigger | What to check before deciding |
|---|---|---|
| Services or mixed supplies | Aggregate turnover above ₹20 lakh in most States; lower threshold applies in specified States | Include all India PAN-level turnover, exempt supplies and inter-State supplies while computing aggregate turnover. |
| Exclusive supply of goods | Higher threshold of up to ₹40 lakh may apply in many States, subject to State/product conditions | Do not apply the ₹40 lakh threshold blindly if services are also supplied or if the State has a lower threshold. |
| Compulsory registration cases | Registration may be required irrespective of turnover | Check Section 24: inter-State taxable supply, casual taxable person, e-commerce/TCS cases, reverse charge and other notified categories. |
| Voluntary registration | Allowed even below threshold | Useful for ITC and B2B credibility, but it creates monthly/quarterly filing and invoice discipline. |
The biggest compliance mistake is using a single national rule without checking the nature of supply. A cloud kitchen, consultant, D2C brand, dropshipper and wedding planner can all cross the GST line in different ways even if the revenue number looks similar.
A designer in Gurugram serving a client in Bengaluru, a technology consultant billing a company in Mumbai, and an agency managing campaigns for clients in five States are all making supplies beyond their home market. Under GST, this requires a separate look at location of supplier, place of supply and aggregate turnover. The business may not need a GSTIN merely because it has clients in another State if a service-provider exemption below threshold applies, but once turnover crosses the applicable limit or another compulsory trigger applies, registration should not be delayed.
| Business model | Likely GST registration approach | Risk point |
|---|---|---|
| One office, clients across India | Usually one GSTIN in the State from where services are supplied | Place-of-supply analysis still matters for IGST vs CGST/SGST. |
| Offices in multiple States making independent supplies | Separate GST registration may be needed in each supplying State | Centralised billing without substance can trigger audit queries. |
| Remote employees in other States | Not automatically a separate GSTIN | Check whether there is a fixed establishment or branch making supplies. |
| Project site in another State | May become a casual taxable/fixed establishment issue | Contract wording and on-site presence matter. |
For B2B services supplied from one State to a registered client in another State, the invoice usually carries IGST. For intra-State services, CGST and SGST apply. The accounting team should align customer GSTIN, place of supply, HSN/SAC, invoice series and return reporting in GSTR-1 and GSTR-3B. A mismatch between invoice GSTIN and the customer’s actual registration can create ITC disputes for the client.