For an Indian taxable supply, start with CGST Rule 46, then apply the rules for your registration status, supply type, classification and any current notifications. A compliant tax invoice normally identifies the supplier and recipient, carries a financial-year-unique serial number and issue date, describes the goods or services with the applicable HSN or SAC, shows taxable value and the correct tax split, and states place-of-supply and reverse-charge information where relevant. Exempt and composition-scheme transactions generally use a bill of supply instead. Rates cannot be selected from a generic template: identify the correct tariff or service classification in the current CBIC schedules first.
What a GST invoice must establish
A GST invoice is the transaction record that connects a supplier, recipient, supply, value, classification and tax liability. The legal starting point is CGST Rules, Rule 46, read with the Central Goods and Services Tax Act, applicable notifications and special rules. The checklist below is a practical summary, not a universal form: provisos, Rule 54 special cases and notifications can change which particulars are required.
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Before issuing an invoice, confirm that the transaction is taxable, that the issuer is required to register or is otherwise issuing the document under GST, and whether a bill of supply, receipt voucher, credit note, debit note or another document is the correct record.
Core particulars under Rule 46
| Particular | What to enter or check | Qualification |
|---|---|---|
| Supplier identity | Legal name, address and GSTIN. | Use the registration details for the entity making the supply. |
| Invoice number | A consecutive serial number in one or more series. | It must be unique for the financial year. The current rule text specifies a maximum of 16 characters; verify the live amended rule before relying on that limit. |
| Date | Date of issue. | Invoice timing also depends on whether the supply is goods or services and on the supplier category. |
| Recipient | Recipient name, address and GSTIN or UIN when registered or otherwise applicable. | Do not assume an unregistered customer has a GSTIN. |
| Unregistered recipient details | Name and address, plus delivery address, state and state code where the taxable supply is ₹50,000 or more. | Other cases are subject to request-based and specified electronic-supply provisions. |
| Classification | HSN code for goods or Accounting Code (SAC) for services. | Required digits and exemptions can vary by notification, turnover and class of supply. |
| Description and quantity | Description of goods or services; for goods, quantity and unit or unique quantity code. | Describe enough to connect the line item to the actual supply. |
| Value | Total value and taxable value after applicable discount or abatement. | Show the calculation consistently with the transaction terms. |
| Tax | Applicable rate and amount, identifying CGST, SGST/UTGST, IGST and cess as relevant. | The tax split follows the nature of the supply and current law. |
| Place of supply | Place of supply and the state name for an interstate supply. | It supports the decision between an intrastate CGST-plus-SGST/UTGST presentation and interstate IGST. |
| Delivery address | Include it when different from the place of supply. | Keep the address consistent with shipping and contract records. |
| Reverse charge | State whether tax is payable under reverse charge. | Use the applicable wording or indicator required by the current rules and system. |
| Signature | Signature or digital signature of the supplier or authorised representative. | Specified electronic documents and other exceptions can remove the ordinary signature requirement. |
Use the official CBIC invoice rules page alongside Rule 46 when a special transaction, document type or electronic process is involved. A template that omits a field, uses the wrong HSN/SAC or cannot preserve invoice sequencing is not made compliant merely by being labelled “GST invoice.”
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How to determine the GST rate
GST rates are classification-specific. First identify the goods tariff heading or service classification, then read the applicable rate entry, conditions, exemptions and cess in the current CBIC GST Goods and Services Rates schedules and any later notifications. The title of an item alone is often insufficient: material, composition, intended use, packaging and other facts can change classification.
Why a generic rate list is unsafe
The official CBIC GST Rates FAQ illustrates the issue. It lists water filters or purifiers under heading 8421 at 18%, but that entry is an example tied to that heading, not a rate for every product described as a purifier. The FAQ also discusses sarees by constituent fibre and heading, with examples at 5%. Those examples demonstrate classification dependence; they are not a complete schedule or a substitute for checking the current entry and conditions.
Intrastate and interstate presentation
For an intrastate supply, the schedule commonly results in CGST and SGST, or CGST and UTGST where applicable. An interstate supply generally uses IGST, subject to the place-of-supply rules and other applicable provisions. The invoice should show the components and amounts that follow the legally determined nature of the supply; do not choose the split based only on the customer’s billing address.
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- Write a precise description of the item or service, including material, model, use and any relevant composition.
- Identify the likely HSN or SAC and check its wording against the actual supply.
- Open the current CBIC schedule and read the complete entry, rate, conditions and cess rather than relying on a search snippet.
- Check later notifications, exemption entries and classification rulings that apply to your facts and date.
- Record the classification rationale in your accounting file so a reviewer can follow why the rate was used.
- Recheck the rate when the law, product specification or supply arrangement changes.
For a question framed as “What is the HS code and GST rate for [item]?”, the bracketed item must be defined precisely before a reliable answer is possible.
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Tax invoice, bill of supply and other documents
When to issue a tax invoice
A supplier making a taxable supply ordinarily issues a tax invoice with the Rule 46 particulars. Under CGST Act Section 31, a supplier of taxable goods issues it before or at removal when movement is involved, or before or at delivery or making the goods available in other cases. The exact trigger can depend on the transaction facts and applicable exceptions.
When a bill of supply applies
CBIC’s Sectoral FAQs explain that suppliers of exempt goods or services and persons paying tax under the composition scheme issue a bill of supply in the relevant cases. A bill of supply does not charge GST as a tax invoice does, so it does not state tax collected as a tax invoice. Confirm that the supply and the issuer actually qualify before replacing a tax invoice.
Credit notes, debit notes and delivery challans
Keep the document type aligned with the event: a delivery challan may accompany movement where an invoice is not yet issued, while credit and debit notes adjust an earlier invoice when the statutory conditions are met. Your numbering, cross-references and accounting records should make the original and adjustment easy to trace.
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Invoice timing: goods versus services
Timing is not one universal deadline. Goods follow the Section 31 removal, delivery or availability rules described above. For services, Rule 47 generally provides 30 days from the date of supply for issuing the invoice. Insurers, banking companies, financial institutions (including non-banking financial companies) generally have 45 days, with special provisions for certain supplies between distinct persons. Verify current amendments and category-specific rules before relying on a deadline.
Set an internal cut-off earlier than the statutory limit. Capture the date of supply, payment, completion or milestone that triggers invoicing, and retain evidence such as a work order, delivery proof or acceptance record. If an invoice is late, correct the process and obtain professional advice about the resulting tax-period and reporting implications rather than silently changing the invoice date.
Record-keeping duties after issuing the invoice
Invoicing is only one part of compliance. The CBIC accounting and record rules require covered registered persons to maintain records of tax payable, tax collected and paid, input tax and input tax credit claimed. They also require a register of tax invoices, credit notes, debit notes and delivery challans issued or received during a tax period.
What a workable record system contains
- A master invoice register with financial year, series, number, date, customer GSTIN or unregistered status, taxable value, tax components and document type.
- Source documents linked to each line: purchase orders, contracts, delivery evidence, service completion records and discount approvals.
- HSN/SAC and rate rationale, including the notification or schedule entry checked for unusual classifications.
- Credit-note, debit-note and delivery-challan links back to the affected invoice.
- Payment, receipt and reconciliation information sufficient to explain outstanding balances and tax reporting.
- Backups and an exportable format, with access controls that preserve the history of edits.
The rules also require the ability to provide audit-trail and inter-linkage information on demand. A system that overwrites an issued invoice without preserving the original, or cannot connect a return figure to source documents, creates a practical audit weakness even when the printed invoice looks complete.
How long to retain records
The CGST Act’s retention framework is tied to the due date for the relevant annual return, with extensions or proceeding-related exceptions. Because the applicable period can change with the Act and the status of an assessment, use the current CGST Act text and any notice or proceeding that affects your records. Do not destroy invoices, ledgers or supporting documents solely because a routine filing has been completed.
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Paper invoice book or digital workflow?
A paper GST invoice book can work for a very small business that issues occasional invoices and can keep a controlled, numbered paper trail. Before using one, compare its fields with Rule 46, confirm that the numbering remains consecutive and unique for each financial year, and maintain duplicate copies and a secure storage process.
Recurring invoicing usually benefits from GST accounting or invoicing software because it can search records, calculate the tax split, preserve numbering, export data and connect invoices with credit notes and returns. Software does not establish legal compliance by itself: verify that it captures every applicable field, supports bills of supply and adjustment documents, preserves an audit trail, provides backups and can accommodate any e-invoice requirement that applies to your business. If a product cannot document those functions, a neatly designed screen is not evidence that the output meets GST rules.
| Decision point | Paper or manual process | Digital process |
|---|---|---|
| Field completeness | Use a checked form and review every invoice. | Configure mandatory fields and test exceptions. |
| Number control | Reserve series and reconcile unused pages. | Lock sequences by financial year and prevent duplicate numbers. |
| Rates and tax split | Calculate and independently review each invoice. | Maintain current rate tables, but review classification and notifications manually. |
| Audit trail and retrieval | File originals, copies and indexes; protect from loss. | Keep immutable history, role-based access, backups and export capability. |
| Adjustments | Cross-reference credit/debit notes by hand. | Link adjustment documents to the original invoice and tax period. |
Common mistakes and fixes
Using a single rate for a product family
Problem: A business applies the same percentage to every item with a similar name. Fix: document the HSN/SAC classification and read the full current schedule entry, including conditions and cess.
Breaking the financial-year sequence
Problem: numbers are reused, skipped without explanation or carried into a new financial year without a controlled series. Fix: define series rules, reconcile cancellations and preserve an explanation for every gap.
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Omitting recipient or place-of-supply data
Problem: the invoice has a customer name but lacks the GSTIN, state code or delivery address required by the facts. Fix: capture registration status and place-of-supply information before finalising the invoice.
Charging tax on a bill of supply
Problem: a composition or exempt transaction is presented as if GST were collected. Fix: confirm the document type and show the bill-of-supply particulars without representing tax as payable by the recipient.
Deleting the original after an error
Problem: an issued invoice is overwritten, leaving no audit trail. Fix: follow the permitted cancellation or adjustment process, issue the appropriate document and retain the original linkage.
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Quick Recap
A pre-issue and month-end checklist
Before sending each document
- Confirm taxable, exempt or composition treatment and choose tax invoice or bill of supply.
- Check supplier GSTIN, recipient details and unregistered-recipient thresholds.
- Verify invoice series, financial-year uniqueness and issue date.
- Validate HSN/SAC, description, quantity, taxable value, discounts and the current rate entry.
- Check intrastate or interstate treatment, tax components, cess, place of supply and reverse-charge indicator.
- Add delivery address, signature or electronic-document treatment where required.
- Save the source documents and a copy of the issued record.
At month-end
- Reconcile the invoice register to sales, receipts and GST return data.
- Investigate missing numbers, duplicate numbers, cancelled documents and unlinked credit or debit notes.
- Review unusual HSN/SAC classifications and rate changes since the prior period.
- Test that a sample invoice can be retrieved with its contract, delivery evidence, payment and tax calculation.
- Back up records and confirm that audit-trail and export functions work.
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