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The Classic Partners LLP · GST Services

GST Invoicing

Setting up compliant tax invoices, bills of supply, credit notes and debit notes so your documents survive input tax credit checks and departmental scrutiny.

Quick answer

Every registered person must issue a tax invoice carrying the particulars prescribed by the invoice rules, within the time limit fixed separately for goods and for services. Where tax is not chargeable, a bill of supply is issued instead, and later changes in value or tax are made through credit notes and debit notes. Each of these documents has to be reported in the return of the relevant period, and your buyer's input tax credit depends on your getting them right.

What we cover

What our GST invoicing service covers

Correct documents, issued on time, in a series the department can follow.

  • Reviewing your existing invoice formats against the mandatory particulars prescribed by the rules
  • Setting up a unique, consecutive document series for each financial year
  • Configuring Harmonised System of Nomenclature (HSN) and Services Accounting Code (SAC) reporting at the required number of digits
  • Applying the correct time limits for issuing invoices for goods and for continuous supplies of services
  • Setting up self-invoicing for supplies received under the reverse charge mechanism
  • Structuring credit notes, debit notes, delivery challans and payment and refund vouchers
Key components

What makes an invoice hold up

The elements that decide whether the document supports the credit claimed on it.

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Mandatory Particulars

Name, address and registration number of both parties, invoice number and date, description, value, rate and amount of tax, and place of supply where it differs from the location of the recipient.

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Time of Issue

Invoices for goods are issued at or before removal or delivery; invoices for services are issued within the prescribed period from supply, with separate rules for continuous supply.

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Credit and Debit Notes

Reductions and increases in taxable value or tax are made only through credit and debit notes linked to the original invoice and reported in the return of the relevant period.

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Bill of Supply and Vouchers

Exempt supplies and composition dealers use a bill of supply, while advances and cancellations are documented through receipt, payment and refund vouchers.

How we work

Our process

From initial consultation to completion.

1

Document Review

Examining every document type you issue against what the rules require for that document.

2

Format Correction

Redrafting invoice and note formats so nothing mandatory is missing and nothing misleading is present.

3

System Setup

Configuring numbering series, codes and tax logic in your billing or accounting software.

4

Team Handover

Briefing the billing team on time limits, reverse charge invoices and when a note replaces a fresh invoice.

Why choose us

Why invoicing defects surface years later

What sets our approach apart.

Your customer's credit depends on your invoice

A defective invoice puts your customer's input tax credit at risk, and the commercial pressure to fix it lands on you long after the sale.

Place of supply errors are expensive to unwind

Charging central and state tax where integrated tax applied, or the reverse, means paying again and then chasing a refund of what was wrongly paid.

Missing code detail is a standing penalty exposure

Incomplete Harmonised System of Nomenclature reporting attracts penalty and shows up directly as a mismatch in return-level validation.

FAQs

GST invoicing questions answered

What people ask before engaging us.

Within the period prescribed by the rules from the date of supply of the service, with a longer period allowed for specified financial sector suppliers and separate timing rules for continuous supply.
A tax invoice is issued where tax is charged on the supply. A bill of supply is issued where no tax is charged, such as exempt supplies or supplies by a person paying tax under the composition scheme.
Yes. A registered person liable to pay tax under reverse charge on a supply received from an unregistered supplier must issue an invoice in respect of that supply.
Yes. The series must be unique and consecutive for a financial year, so most businesses restart the series at the beginning of each year with a distinguishing prefix.

Not sure your invoices would survive a departmental check?

We will review your document set and fix the formats, series and timing.

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