GST Invoicing Compliance | Savlana Init

GST Compliance · Invoicing

GST Invoicing — Every Invoice. Legally Compliant.

GST invoicing compliance — tax invoice format, mandatory fields, bill of supply, credit/debit notes, time of supply, HSN/SAC code requirements, and e-invoicing applicability — we ensure every document your business issues is legally valid and ITC-claimable by your buyers.

A GST tax invoice is the foundational document of the entire GST system — it triggers the buyer's right to claim input tax credit, establishes the time of supply, determines the place of supply, and feeds into the GSTR-1 filing. Section 31 of the CGST Act and Rule 46 of the CGST Rules prescribe the mandatory contents of a tax invoice — and an invoice that is missing mandatory fields or contains incorrect information is not a valid document for ITC purposes. Buyers who claim ITC on deficient invoices face demands for reversal; suppliers who issue deficient invoices face penalties.

The mandatory fields in a GST tax invoice include: name, address, and GSTIN of the supplier; consecutive serial number; date of issue; name, address, and GSTIN (or UIN) of the registered recipient; HSN/SAC code; description of goods/services; quantity and unit; taxable value; applicable GST rate and amount (CGST, SGST/UTGST, or IGST); place of supply; whether tax is payable on reverse charge; and the supplier's signature or digital signature. For exports, the invoice must additionally state the relevant LUT number (if applicable), the shipping bill details, and the declaration of export.

Beyond the basic tax invoice, the GST regime prescribes specific document types for specific transactions — a Bill of Supply for composition dealers and exempt supplies; a Receipt Voucher for advance payments received before supply; a Refund Voucher where the advance is later returned; a Payment Voucher for reverse charge payments; a Delivery Challan for movement of goods for reasons other than supply (job work, exhibition, branch transfer); and Credit/Debit Notes for post-supply adjustments. We review your invoice formats, correct mandatory field gaps, and ensure your entire documentation suite is GST-compliant.

Our GST Invoicing Services

Tax Invoice Format Review

Review and correction of your tax invoice format — confirming all mandatory fields under Rule 46 are present and correctly populated, including HSN/SAC code and place of supply.

HSN/SAC Code Compliance

Review of HSN/SAC codes on invoices — confirming correct digit count (4-digit or 8-digit based on turnover) and accurate classification of each product or service.

Bill of Supply Compliance

Advisory on when a Bill of Supply must be issued (composition dealers, exempt supplies) and the correct format — ensuring ITC is not incorrectly claimed on bills of supply.

Credit Note & Debit Note Compliance

Review of credit note and debit note formats — mandatory fields, linkage to original invoices, and timely issuance within the Section 34 time limit.

Receipt Voucher for Advance Payments

Advisory on the correct format and GST treatment of receipt vouchers for advance payments received before the date of supply — and adjustment in the tax invoice at time of supply.

Delivery Challan Compliance

Review of delivery challan format for goods movements that are not supply — job work, branch transfers, exhibition, and loan/return — ensuring Rule 55 compliance.

Time of Supply Advisory

Advisory on the correct time of supply for goods, services, and continuous supply — determining when the GST liability arises and the invoice must be issued.

E-Invoicing Applicability & IRN Setup

Assessment of e-invoicing applicability and setup of the IRN generation workflow — ensuring all applicable B2B invoices carry a valid IRN before being issued to buyers.

Our Process

Invoice Format Audit

All current invoice formats — tax invoice, bill of supply, credit note, delivery challan — are reviewed against the mandatory requirements of Rule 46, 46A, 49, 50, 51, 52, and 55.

Gap Identification & Correction

Missing mandatory fields, incorrect HSN codes, wrong GST rates, and incorrect place of supply declarations are identified and corrected in the template.

Document Suite Design

The complete document suite is designed — tax invoice, bill of supply, receipt voucher, refund voucher, payment voucher, credit note, debit note, delivery challan — each in the correct format.

Staff Training on Invoice Issuance

Key billing and accounts staff are trained on correct invoice issuance — time of supply rules, when to issue which document, and how to handle post-supply adjustments.

E-Invoicing Integration

If applicable, e-invoicing (IRN generation) is integrated into the invoice issuance workflow — so all B2B invoices are automatically IRP-registered.

Why It Matters

✓Tax invoice carries all mandatory Rule 46 fields — buyer ITC protected

✓HSN/SAC codes correct and digit-compliant on every invoice

✓Bill of supply, credit note, and debit note formats all compliant

✓Time of supply correctly determined — GST liability correctly triggered

✓Delivery challans compliant — non-supply movements correctly documented

✓Advance receipt vouchers issued correctly — no premature ITC trigger

✓E-invoicing IRN integrated into invoice workflow where applicable

✓Post-supply credit/debit notes issued within Section 34 time limits

Frequently Asked Questions

Mandatory fields under Rule 46 include: name, address, and GSTIN of supplier; consecutive serial number with prefix/suffix; date; name, address, and GSTIN/UIN of registered recipient (or name and address for unregistered); HSN/SAC code; description, quantity, and UOM of goods/nature of services; taxable value; applicable tax rate and amount (CGST/SGST/IGST separately); place of supply; whether reverse charge applies; and signature of the authorised signatory.

A tax invoice is issued by a regular GST taxpayer on taxable supplies. A bill of supply is issued by: composition scheme taxpayers (who cannot charge GST); and regular taxpayers on exempt supplies or non-taxable supplies. ITC cannot be claimed on a bill of supply — the buyer receives no credit. Issuing a bill of supply where a tax invoice is required (or vice versa) creates compliance issues for both parties.

For goods, the tax invoice must be issued at or before the time of delivery of goods (or before or at the time of removal of goods where delivery is not required). For supply of services, the invoice must be issued within 30 days of the date of supply of service (45 days for banking companies and financial institutions). For continuous supply of services, invoices must be issued as specified in the contract — or at least once every billing cycle.

A credit note can be issued by the supplier up to the earlier of: the September 30 following the financial year in which the original supply was made; or the date of filing of the annual return (GSTR-9) for that year. Credit notes issued after these dates cannot be declared in GSTR-1 and the tax adjustment is not available to the supplier.

A receipt voucher is required when the supplier receives payment (advance) before the supply is made. On receipt of advance, the supplier must issue a receipt voucher declaring the advance amount and the applicable GST rate. At the time of actual supply, a tax invoice is issued for the full supply value — adjusted by the advance receipt voucher. This ensures GST is paid on the advance in the correct period.

Failure to issue a tax invoice, bill of supply, or other prescribed document — or issuing an incorrect document — attracts a penalty of ₹10,000 per invoice or the amount of tax involved, whichever is higher, under Section 122 of the CGST Act. Habitual non-issuance of invoices may also be treated as evidence of suppression and attract the higher penalty under Section 74.

Need your GST invoicing reviewed and made compliant?

We review all your invoice formats, correct mandatory field gaps, design the complete document suite, train your billing team, and integrate e-invoicing where required — ensuring every document your business issues is legally valid.