A customer's State is only one part of the picture
Selling to a customer in another State does not automatically mean the supplier must open a registration in the customer's State. The CGST registration framework focuses on liability in the State or Union territory from which taxable supplies are made, while the IGST framework determines inter-State treatment and place of supply. Both analyses matter, but they answer different questions.
Begin by mapping the supplier's establishments and activities, not simply its customer addresses. A business dispatching all goods from one registered State may make inter-State supplies from that registration. A new branch or warehouse elsewhere can create different facts requiring a separate registration review before stock or sales move there.
List what the new location will actually do
Record whether the location stores goods, dispatches orders, performs services, negotiates contracts, raises invoices or only supports staff travel. Include who controls it, whether the business has a right to use it and how long the arrangement will last. A rented warehouse and an employee occasionally working from a hotel should not be assumed to have identical registration consequences.
For services, identify the establishment supplying the service and the applicable location and place-of-supply rules. The customer's location alone cannot resolve every case. Contracts, staffing, fixed-establishment facts and the establishment most directly concerned can matter, so retain the operational evidence used in reaching the conclusion.
For goods, trace physical movements and invoice flows. Distinguish direct dispatch from the home State, storage in another State, customer delivery through a transporter and goods held by a fulfilment provider. A marketplace's advertised delivery coverage does not, by itself, tell you where your inventory is stored or from where your supplies are made.
Apply turnover and special rules correctly
Aggregate turnover is computed on an all India basis for persons under the same PAN. A second State is not a way to restart the ordinary turnover calculation from zero. Once the combined figure and business facts are known, apply the registration provisions and any relevant exemptions for each State in which liability arises.
Do not assume every inter-State service supplier must register regardless of value; notified relief can apply. Conversely, do not assume the conditional goods threshold exemption applies to every activity or State. Compulsory registration cases, excluded goods and specified conditions must be reviewed alongside the ordinary threshold analysis.
The Act treats separate registrations of the same person as distinct persons for GST purposes. This can affect supplies between establishments, including transactions without consideration under the relevant statutory conditions. A new registration therefore changes more than the address printed on customer invoices; it may require branch invoicing, valuation and credit controls.
Work through a stock-location example
Illustratively, a Mumbai distributor invoices ₹3 lakh of goods to a Bengaluru customer and dispatches directly from Mumbai. The registration review should not conclude that a Karnataka GSTIN is needed solely because the buyer is there. The inter-State invoice and place-of-supply treatment still need to be correct.
Now change the facts: the distributor leases a Bengaluru warehouse, moves ₹12 lakh of stock there and dispatches local orders from it. The warehouse, stock transfer and supplies from that location need a fresh State-specific registration review. Continuing to issue every invoice from Mumbai without examining the new arrangement can disconnect tax documents from actual operations.
Keep the warehouse agreement, fulfilment contract, inventory records and proposed invoice samples together. These show whether the business has established an operating location and how the supply chain changes. A short diagram or transaction table is often more useful than asking whether “selling in Karnataka” is allowed without explaining the facts.
Separate special location cases
A temporary event in a State with no fixed place of business may raise casual taxable person registration questions rather than the same process used for a permanent branch. Review the event period, whether sales occur at the venue and any specific exemption. Do this early because advance application and estimated tax deposit requirements may apply where that category is relevant.
SEZ units and developers also have specific registration treatment. The Act requires separate registration for an SEZ unit or developer distinct from a location outside the SEZ in the same State or Union territory. Do not add an SEZ location to an ordinary location list without checking that rule and the relevant supporting approvals.
The October 2026 GST Council release recommended a simplified mechanism for certain small e-commerce goods suppliers without physical presence in other States. A recommendation is not itself an operating exemption. Check an implementing notification and portal rollout before relying on that proposal to change a State registration plan.
Include outsourced locations in the map even if the business has no staff there. Ask the fulfilment provider for the actual stock-location list and movement reports. Ownership of inventory, access rights and the dispatch model need to be understood from the contract and records rather than inferred from the absence of a company signboard.
Approve the expansion map before launch
Create a table of each location, its State, activity, stock ownership, invoice issuer, registration decision and unresolved issue. Assign responsibility for premises evidence, bank records, signatories and customer master changes where a new registration is required. This turns the legal conclusion into a practical opening checklist.
Before the first dispatch, verify that invoices, movement records and accounting entries use the intended registrations. Reconcile the first month's branch transactions separately to catch accidental billing under the wrong GSTIN. Revisit the map whenever inventory, staffing or contracts change materially, because the original conclusion depends on the operating facts remaining true.