GST Annual Return (GSTR-9) FY 2025-26: A Complete Filing Guide

If you’re a GST-registered business in India, the annual return season brings a familiar wave of anxiety. GSTR-9 isn’t just another monthly compliance — it’s a comprehensive reconciliation of an entire financial year’s GST activity, and errors here can trigger scrutiny, notices, and penalties that take months to resolve.

At KSRM Associates, we file dozens of GSTR-9 returns every year for businesses across Ghaziabad and the wider NCR region. This guide breaks down exactly what you need to know for FY 2025-26.

What is GSTR-9?

GSTR-9 is the annual return that consolidates all the GST data a business has reported through the year — outward supplies, inward supplies, input tax credit (ITC) claimed, and taxes paid — across all your monthly or quarterly returns (GSTR-1 and GSTR-3B).

Think of it as the final reconciliation statement: a year-end summary that must match what was reported during the year, with any discrepancies explained or corrected.

Who Must File GSTR-9?

GSTR-9 is mandatory for most regular taxpayers registered under GST, with a few important exceptions:

• Mandatory for: Regular taxpayers with aggregate annual turnover above the prescribed threshold (currently ₹2 crore for mandatory filing in most cases, though businesses below this can file voluntarily)
• Not required for: Composition scheme taxpayers (who file GSTR-9A separately), casual taxable persons, non-resident taxable persons, input service distributors, and persons paying TDS/TCS under GST

If your turnover crossed ₹2 crore at any point during FY 2025-26, you should treat GSTR-9 filing as compulsory and budget time for it accordingly.

Documents and Data You’ll Need

Before you or your CA can begin compiling GSTR-9, gather the following:

1. All GSTR-1 returns filed during the year — outward supply details
2. All GSTR-3B returns filed during the year — summary returns with tax payment details
3. GSTR-2B statements for each month — auto-generated ITC statement
4. Books of accounts — sales register, purchase register, and ledgers
5. HSN-wise summary of outward and inward supplies
6. Details of amendments, credit notes, and debit notes issued during the year
7. ITC reversal records, if any (e.g., for exempt supplies or blocked credits)
8. Reconciliation working between books and GST returns

The single biggest cause of delay in GSTR-9 filing is not having this data organized in advance. We recommend starting reconciliation at least 4-6 weeks before the due date.

Key Sections of GSTR-9

GSTR-9 is structured into six parts:

• Part I: Basic registration details (auto-populated)
• Part II: Details of outward and inward supplies declared during the year
• Part III: Details of ITC as declared in returns filed during the year
• Part IV: Details of tax paid as declared in returns filed during the year
• Part V: Particulars of transactions for the previous FY declared in returns of April to September of the current FY (or up to the date of filing annual return, whichever is earlier)
• Part VI: Other information — demands, refunds, HSN-wise summary, and late fees

Part V often causes confusion because it requires you to capture transactions pertaining to the previous year but reported in returns filed after the year closed — a timing nuance that frequently trips up first-time filers.

Common Errors That Trigger GST Notices

Through our filing experience, these are the recurring mistakes we see — and that GST officers actively look for during scrutiny:

1. Mismatch between GSTR-1 and GSTR-3B turnover. If outward supply values reported across the two returns don’t reconcile, expect a notice asking for an explanation.

2. Excess ITC claimed compared to GSTR-2B. With auto-population from GSTR-2B now central to ITC verification, claiming credit not reflected there is a near-automatic flag.

3. Incorrect HSN-wise reporting. Many businesses use generic or incorrect HSN codes, which creates inconsistencies between the summary in GSTR-9 and actual invoices.

4. Ignoring credit/debit notes. Failing to properly account for amendments made through credit and debit notes leads to value mismatches.

5. Not reconciling with books of accounts. GSTR-9 should tie back to your audited financials. A large unexplained gap between GST turnover and books turnover (which also feeds into GSTR-9C, the reconciliation statement, where applicable) is a red flag.

6. Late filing without checking late fee applicability. Late fees for GSTR-9 apply per day per Act (CGST and SGST), and these can add up quickly if filing is delayed past the due date.

Due Date and Late Fees

For FY 2025-26, GSTR-9 is due by 31st December 2026, unless extended by the government (extensions are not uncommon, but should never be assumed or relied upon for planning).

Late fees apply as ₹200 per day (₹100 CGST + ₹100 SGST), subject to a cap based on turnover, until the return is filed.

How We Help

At KSRM Associates, our GST compliance process for annual returns includes:

• Full-year reconciliation between books, GSTR-1, GSTR-3B, and GSTR-2B
• Identification and correction of mismatches before filing
• HSN summary verification
• Liaison support if a notice is received post-filing
• Coordination with GSTR-9C (reconciliation statement) where turnover exceeds the audit threshold

Final Thoughts

GSTR-9 is less about filling a form and more about disciplined reconciliation. Businesses that maintain clean monthly records find the annual return process straightforward; those that don’t often discover discrepancies only at year-end, when fixing them is harder and slower.

If you’d like our team to review your GST filings ahead of the FY 2025-26 deadline, get in touch with KSRM Associates — we recommend starting the review at least six weeks before the due date.