GST Blog
Clear, practical guides on GST invoicing, rates and compliance for Indian businesses — all verified against official sources and updated for the September 2025 reform.
GST rates explained (2025 reform)
Old vs new slabs and what changed after September 2025.
How to calculate GST
Formulas and worked examples for any amount.
GST invoice format
Mandatory fields and a clean sample layout.
Reverse GST calculation
Extract GST from a tax-inclusive price.
GST number (GSTIN) format
What each of the 15 digits means.
GST late fee rules
Per-day fees, caps and NIL returns.
GST interest calculation
Section 50 interest on late payment.
HSN code list
Common HSN codes and their GST rates.
SAC code list
Common service codes and rates.
Debit note vs credit note
When to issue each under GST.
Delivery challan format
Moving goods without an invoice.
Proforma vs tax invoice
Key differences explained.
E-way bill rules
When it's needed and validity.
E-invoice eligibility
The ₹5 crore threshold explained.
GST registration limit
Turnover thresholds by state.
Composition scheme
Flat-rate GST for small businesses.
QRMP scheme
Quarterly returns, monthly payment.
GST bill vs invoice
Are they the same thing?
Input tax credit basics
How ITC works and its conditions.
Common GST mistakes
And how to avoid penalties.