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The Classic Partners LLP ยท GST Services

GSTR-1 Filing

Accurate, invoice-wise GSTR-1 preparation and filing for your outward supplies, filed on the monthly or quarterly schedule that applies to your registration.

Quick answer

GSTR-1 is the monthly or quarterly return in which a registered taxpayer reports details of outward supplies of goods and services โ€” invoice-wise for B2B transactions and consolidated for B2C โ€” and it forms the basis on which the recipient's input tax credit is auto-populated.

What we cover

What our GSTR-1 service covers

From invoice data collection to final filing, handled on your applicable due date.

  • Compiling invoice-wise B2B and consolidated B2C outward supply data
  • Reporting credit notes, debit notes and export invoices
  • Reconciling invoice data with your books before filing
  • Filing on the monthly (11th) or QRMP quarterly (13th) due date
  • Correcting mismatches flagged during validation
  • Amending previously reported invoices in later periods
Key components

What goes into a GSTR-1 filing

Every category of outward supply data required by the return.

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B2B Invoices

Invoice-wise reporting of all business-to-business taxable outward supplies.

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B2C Supplies

Consolidated reporting of business-to-consumer supplies, state-wise where applicable.

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Credit & Debit Notes

Reporting of notes issued against previously filed invoices, correctly linked to the original supply.

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Exports & Zero-Rated Supplies

Reporting of export invoices and supplies to SEZ units under the applicable table.

How we work

Our process

From initial consultation to completion.

1

Invoice Data Collection

Gathering the sales register and invoice details for the return period.

2

Categorisation

Splitting invoices into B2B, B2C, exports, notes and amendments as required by the return format.

3

Validation

Checking invoice numbers, GSTINs and tax computation before upload.

4

Filing

Filing GSTR-1 on the portal and sharing the filed summary and acknowledgment with you.

Why choose us

Why accurate GSTR-1 filing matters

What sets our approach apart.

It drives your buyers' credit

Errors in your GSTR-1 directly affect the input tax credit available to your customers, which can strain business relationships.

Late filing has a cascading effect

GSTR-1 must generally be filed before GSTR-3B for the same period, so delays here delay your entire compliance cycle.

Amendments need care

Correcting an invoice in a later period follows specific rules, and getting this wrong can create fresh mismatches.

FAQs

GSTR-1 filing questions answered

What people ask before engaging us.

Monthly filers must file by the 11th of the following month, while taxpayers under the QRMP scheme file quarterly by the 13th of the month following the quarter.
GSTR-1 cannot be revised once filed, but incorrect invoices can be amended in the GSTR-1 of a subsequent period.
A nil GSTR-1 must still be filed for that period to remain compliant, even where no sales occurred.
Yes, tax liability reported in GSTR-1 is used to auto-populate parts of GSTR-3B, so keeping the two consistent is important.

Keep your outward supply data accurate every period

We'll compile, validate and file your GSTR-1 on time, every time.

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