GST and small business guides
Short, plain-English guides to the GST rules you meet every day: what goes on an invoice, which tax to charge, when returns are due and what changed recently. Each guide links to the official source, so you can check the law for yourself.
GST basics
How GST works: the taxes, the rates and the codes on every bill.
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CGST, SGST and IGST explained with examples
When to charge CGST + SGST and when to charge IGST, how place of supply decides it, how credit is set off, and worked examples for shops and service firms.
Updated · 7 min read
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HSN and SAC codes: how to find the right code
What HSN and SAC codes mean, how many digits your invoices need by turnover, how to read an 8-digit code, and a practical way to find the right code.
Updated · 6 min read
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New GST rates 2025–26: what changed for small businesses
The GST rate overhaul of 22 September 2025: the 5%, 18% and 40% slabs, items that moved, the February 2026 tobacco change, and what to update in billing.
Updated · 7 min read
GST returns
GSTR-1, GSTR-3B and the dates, fees and fixes that come with them.
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GSTR-3B explained: due dates, late fees and interest
GSTR-3B due dates for monthly and QRMP filers, how late fees and 18% interest are worked out, what changed in 2025 and 2026, and a worked example.
Updated · 7 min read
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How to file GSTR-1: a step-by-step guide
File GSTR-1 on the GST portal step by step: due dates for monthly and QRMP filers, IFF, which table each sale goes in, HSN summary and late fees.
Updated · 6 min read
Invoicing
What a valid GST invoice, bill of supply or e-invoice must contain.
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E-invoicing in GST: who needs it and how it works
Who must issue GST e-invoices (turnover above ₹5 crore), who is exempt, how the IRN and QR code work, the 30-day reporting limit and 24-hour cancellation.
Updated · 7 min read
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GST invoice rules: mandatory fields under Rule 46 (with example)
Every field a GST tax invoice must show under Rule 46, how many HSN digits you need, when to issue it, and a filled-in example for a small business.
Updated · 8 min read
Running your business
Schemes and choices that change how a small business pays tax.
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Composition scheme: rules, limits and bill of supply
GST composition scheme: the ₹1.5 crore and ₹75 lakh limits, 1%, 5% and 6% rates, who cannot opt, the bill of supply, CMP-08 and GSTR-4 dates, with an example.
Updated · 6 min read
Put the rules into practice
The free tools help with one-off checks. When you bill every day, Invoiqo works out CGST, SGST or IGST from the customer’s state, adds HSN codes to each line and keeps your invoice numbers in order.
A free plan that never expires
Make your next GST invoice in Invoiqo
Start on the free plan and move to a paid plan only when you need more, such as GSTR-1 and GSTR-3B summaries or e-invoicing.