01
How does GST work?
A registered supplier generally charges the applicable GST on a taxable supply and reports it through the prescribed process. The destination principle means tax accrues according to the place of consumption or place of supply rather than merely where the supplier originated the transaction.
Input tax credit can reduce cascading when its legal conditions are met. A billing tool can calculate entered amounts and retain invoice fields, but it cannot decide credit eligibility or the correct treatment from an invoice total alone.
- Identify the supplier and recipient.
- Classify the goods or services.
- Determine place of supply and transaction type.
- Apply the verified rate and document requirements.
Use the maintained field checklist in the GST invoice format.
02
What are CGST, SGST, UTGST and IGST?
For an intra-state taxable supply, the applicable amount is commonly split between Central GST and State GST, or Union Territory GST where relevant. Integrated GST commonly applies to an inter-state taxable supply. The actual place-of-supply rules determine the classification.
Do not choose the split from postal addresses alone. Confirm registration, place of supply, delivery context and the rule that applies to the goods or services before issuing the tax invoice.
- CGST: central component.
- SGST: state component.
- UTGST: union-territory component where applicable.
- IGST: integrated component for applicable inter-state supplies.
Run confirmed arithmetic with the GST calculator.
03
What belongs on a GST tax invoice?
CBIC Rule 46 lists particulars including supplier identity and GSTIN, a financial-year-unique serial number, issue date, recipient detail, classification and description, quantity where relevant, values, tax rate and amount, place of supply for inter-state transactions and other applicable declarations.
The exact fields vary with recipient and transaction conditions. Use the maintained official rule rather than assuming that a generic invoice layout is sufficient.
- Supplier and recipient identity
- Unique number and issue date
- HSN or service classification and description
- Taxable value, rate and tax amount
- Place of supply and required declarations
Review the product context in GST invoicing.
04
Worked example: arithmetic after classification
Assume a reviewer has confirmed an intra-state taxable value of ₹100,000 and a total GST rate of 18% for the specific transaction. The arithmetic produces ₹9,000 CGST and ₹9,000 SGST, for an invoice total of ₹118,000.
The example does not establish that 18% or an intra-state split applies elsewhere. Classification, exemption, reverse charge, place of supply and other facts must be confirmed first.
- Taxable value: ₹100,000
- Illustrative CGST: ₹9,000
- Illustrative SGST: ₹9,000
- Illustrative total: ₹118,000
Separate IRP reporting through what is e-invoicing.
05
How does GST relate to e-invoicing?
GST invoicing and e-invoicing are connected but not identical. A GST tax invoice must contain the applicable particulars. E-invoicing adds the IRP reporting and validated IRN or QR-code process for taxpayers and documents within the current mandate.
A business can have GST invoice obligations without every transaction entering the e-invoicing flow. Confirm current applicability, thresholds, exclusions and reporting time limits from official sources.
- GST invoice: tax document particulars.
- E-invoicing: applicable IRP reporting process.
- IRN: identifier returned after successful registration.
Understand goods classification in what is an HSN code.
Primary sources
Check the current official position.
Continue in context