GST guides
The questions that come up while you are billing.
Written for the person raising the invoice, not for a tax practitioner. Each one answers a single question properly and tells you where the general rule stops applying.
By Mohit Sehgal, founder of BahiSathi · Updated 15 Aug 2026
CGST and SGST, or IGST? How place of supply decides
One comparison decides the tax heads on your invoice — and it is not the customer’s billing address. Worked examples, the union territory case, and the mistake almost everyone makes.
Read it →What Rule 46 requires on a tax invoice
The full field list in plain language, the four that go missing most often, and what is convention rather than requirement.
Read it →Turning a quotation into a tax invoice
What changes, what carries over, why the two numbering series stay separate, and when your tax liability actually starts.
Read it →Billing without a GSTIN
You can invoice customers without registering. What you cannot do is charge GST — and the difference between those two is where most people go wrong.
Read it →Credit and debit notes under Section 34
Which one you need, why an issued invoice is never edited or deleted, the seven reason codes the portal accepts, and the deadline that catches people out.
Read it →Filing GSTR-1 from your invoices
What lands in B2B, B2CL, B2CS, CDNR, CDNUR, HSN and DOCS, why the ₹1,00,000 threshold matters, and what our export deliberately does not cover.
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These pages explain the general position and are not a substitute for advice from your accountant on a specific transaction. Rates, thresholds and reporting requirements change.
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