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GSTR-1: Filing and Due Dates

Complete guide to GSTR-1 filing. Learn about due dates, details to be furnished, and common errors to avoid.

GetYourCA Team
14 February 2026·Updated 14 February 20262 min read12.5K views

What is GSTR-1?#

GSTR-1 is a monthly/quarterly return that contains details of outward supplies (sales). It's the primary return for reporting sales.

Due Dates#

TurnoverFrequencyDue Date
Above Rs 5 croreMonthly11th of next month
Below Rs 5 croreMonthly13th of next month
Below Rs 1.5 croreQuarterly13th of month after quarter

Details Required#

Invoice-wise details:#

  • Invoice number and date
  • Recipient GSTIN
  • Recipient name
  • Place of supply
  • Invoice value
  • Tax rate and amount
  • HSN code

Summary Tables:#

  • Taxable supplies
  • Exempted supplies
  • Nil-rated supplies
  • Advances received
  • Amendments to previous returns

How to File GSTR-1#

  1. Log on to GST portal
  2. Go to 'Returns' > 'File Returns'
  3. Select GSTR-1
  4. Upload invoices or enter manually
  5. Review details
  6. File with DSC or EVC

Common Mistakes#

  • Missing HSN codes
  • Wrong tax rate
  • Incorrect recipient GSTIN
  • Not reporting advances
  • Wrong place of supply

Reconciliation#

  • Match with GSTR-2B (input credit)
  • Reconcile with books of accounts
  • Check for mismatches

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Disclaimer

We have taken utmost care to research and write this article for your information. However, tax laws are complex and subject to frequent changes. This article is for general guidance only and should not be considered professional advice. Individual circumstances vary significantly — what works for one person may not apply to another.

Before making any tax-related decisions, we strongly recommend consulting with a qualified Chartered Accountant or tax professional who can assess your specific situation. We do not accept any liability for decisions made based on this information.

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