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GST classification
Every time an invoice is rendered, GST Manager works out what kind of sale it is and applies the right tax treatment for you. You don't pick this by hand on each order — the plugin decides it from three things it already knows: your home state, the customer's state, and whether the customer holds a GSTIN (their 15-character GST registration number). Getting those three inputs right is all you need to do; the classification and the CGST/SGST-vs-IGST split follow automatically.
The four classes
B2B-intra — the customer has a GSTIN and is in your home state. B2B-inter — the customer has a GSTIN but is in a different state. B2C — the customer has no GSTIN (an end consumer). Export — a sale outside India. A non-INR invoice with no billing country resolves to Export automatically.
GST Manager → Dashboard → Invoice classification
What drives each outcome
The customer's GSTIN is what separates business (B2B) from consumer (B2C) sales. When a customer enters a valid GSTIN on their contact page, the invoice becomes B2B; with no GSTIN it is B2C. See GSTIN validation for how that field is captured and checked.
Your home state versus the customer's state is what decides the tax split. When both sides are in the same state the supply is intra-state (CGST + SGST); when they differ it is inter-state (IGST). That is why your home state matters even though it never appears as an option per order — set it once under Setup → Company & Tax and every invoice inherits it.
For sales outside India, the invoice is treated as an Export. Non-INR invoices that have no billing country are resolved to Export for you, so foreign-currency customers don't accidentally pick up Indian tax.
How the tax is calculated
The total GST is simply the invoice subtotal × the configured rate ÷ 100. That amount is then split according to the class:
- B2B-intra / B2C in your state → split into equal CGST + SGST lines.
- B2B-inter / B2C in another state → a single IGST line.
- Export and any zero-subtotal invoice → no GST is applied at all.
Each invoice also shows a Place of supply, so the tax treatment is visible on the document itself and lines up with what you file.
Getting it right
Two settings do all the work. First, set your home state accurately under Setup → Company & Tax — this is matched against the Indian states registry and is what CGST/SGST-vs-IGST hinges on. Second, make sure customers can enter their GSTIN so business sales are recognised as B2B. Walk through both in Configure GST.