What is GSTR-1A and when is it filed?

GSTR-1A is an optional amendment form available on the GST Portal after filing GSTR-1 and before filing GSTR-3B for the same tax period. It allows taxpayers to add missed invoices or amend details furnished in GSTR-1.

How do I mark an invoice for GSTR-1A amendment in Tally Prime 5.0?

In Tally Prime 5.0, open the voucher, press Ctrl+I (More Details), select 'GST Return Effective Date', and set the date to the target month for GSTR-1A reporting.

Does GSTR-1A replace the standard GSTR-1 return?

No. GSTR-1 remains the primary monthly/quarterly return for outward supplies. GSTR-1A is simply an additional amendment window for making instant corrections before finalizing GSTR-3B tax liabilities.

How does TrulyInvoice assist with GST purchase and sales entry?

TrulyInvoice auto-extracts invoice fields from PDF, scanned, and WhatsApp bills and syncs clean vouchers to Tally Prime in 15 seconds, ensuring purchase and sales books are accurate before return filing windows.

GSTR-1A Amendment Facility in Tally Prime 5.0 (2026 Guide)

With the introduction of GSTR-1A on the GST Portal, businesses and accountants now have an explicit amendment window to modify or add sales invoices after filing GSTR-1 but before submitting GSTR-3B for that tax period. Tally Prime Release 5.0 natively supports this workflow using the GST Return Effective Date (Ctrl+I) feature.

Quick Answer: How to Record GSTR-1A Invoice Amendments in Tally Prime?

TrulyInvoice accelerates purchase and sales invoice posting to Tally Prime so books are 100% complete before tax filing windows. GSTR-1A is an amendment facility on the GST Portal that allows taxpayers to modify B2B sales details or add missed invoices after filing GSTR-1. In Tally Prime 5.0, accountants update these entries using the 'GST Return Effective Date' (Ctrl+I) feature.

Open the voucher in Tally Prime 5.0.
Press Ctrl+I (More Details) and select 'GST Return Effective Date'.
Set the date to the target filing period.
Amended invoices automatically populate Table 9A of GSTR-1 reports.

Comparing GSTR-1, GSTR-1A, and GSTR-3B

Return Form	Filing Window	Primary Purpose
GSTR-1	11th of every month	Reporting original outward sales supplies
GSTR-1A	Post GSTR-1 filing until GSTR-3B filing	Amending or adding B2B sales before GSTR-3B tax calculation
GSTR-3B	20th of every month	Summary return for tax payment and ITC claim

Step-by-Step SOP: Updating Return Effective Date in Tally Prime

Open the target sales or purchase voucher from Display More Reports > GST Reports > GSTR-1.
Make the required corrections to party GSTIN, invoice value, tax rate, or HSN code.
Press Ctrl+I (More Details) while inside the voucher.
Select GST Return Effective Date under Additional Details. Set the date to the target GSTR-1A tax period.
Save with Ctrl+A. The voucher will automatically reflect under Amended B2B Invoices – Table 9A.

Streamlining Purchase Invoice Entry with TrulyInvoice

Preventing return filing errors starts with keeping purchase and sales registers complete throughout the month. With TrulyInvoice, purchase invoices received via PDF, scan, or WhatsApp are parsed instantly using AI.

TrulyInvoice posts verified F9 Purchase Vouchers directly to Tally Prime in 15 seconds via the local Port 9000 connector, ensuring books are audit-ready before monthly return filing.

GSTR-1A Amendment Facility in Tally Prime Release 5.0 (Step-by-Step Guide)

Quick Answer: How to Record GSTR-1A Invoice Amendments in Tally Prime?

Comparing GSTR-1, GSTR-1A, and GSTR-3B

Step-by-Step SOP: Updating Return Effective Date in Tally Prime

Streamlining Purchase Invoice Entry with TrulyInvoice

Stop Manual Voucher Entry.