GST Returns in India: Types, Due Dates and Filing Process (2026 Guide)

Filing GST returns correctly is the difference between a business that runs smoothly and one that’s constantly firefighting notices, blocked ITC, or worse—a suspended GSTIN. And yet, most guides out there still recycle the same generic lists from 2018 without addressing what actually changed.

This guide is built for 2026 realities. If you’re a small business owner, freelancer, or startup founder handling GST registration for the first time (or an accountant tired of clients missing deadlines), this is the reference you keep open during filing season.

Let’s get into it.

What Is a GST Return?

A GST return is a periodic document filed on the GST portal containing details of outward supplies (sales), inward supplies (purchases), tax collected on sales, and input tax credit (ITC) claimed—used by tax authorities to assess a business’s net tax liability.

Every business with an active GSTIN files returns. There’s no “optional” here. Even if your sales were zero for the month, you file a NIL return. Skip three consecutive filings and the portal triggers automatic GSTIN suspension—something roughly 40% of small businesses learn the hard way, according to 2025 CBIC compliance data.

The GST framework uses multiple return types because different taxpayers have different obligations. A composition dealer files differently than an e-commerce operator. A non-resident taxable person has a separate form entirely. The system isn’t complicated for the sake of it—it’s segmented by taxpayer category, turnover, and transaction type.

Who Needs to File GST Returns?

Not everyone files the same returns, but everyone registered files something:

• Regular taxpayers (turnover above ₹40 lakh for goods, ₹20 lakh for services)
• Composition scheme dealers (turnover up to ₹1.5 crore, opting for simplified quarterly filing)
• E-commerce sellers and operators (TCS obligations under Section 52)
• Non-resident taxable persons (supplying goods/services in India without a fixed establishment)
• Input Service Distributors (ISDs) distributing ITC across branches
• UIN holders (embassies, UN bodies claiming refunds on zero-rated supplies)
• OIDAR service providers (online digital services to non-taxable persons)

If you’ve completed the GST registration process and hold an active GSTIN, you’re in one of these buckets. No exceptions.

Types of GST Returns in India

Here’s the 2026 return matrix. I’ve stripped out the defunct Sahaj/Sugam references that still float around older guides—those were scrapped years ago.

• GSTR-1
  Who Files: Regular taxpayers
  Purpose: Report all outward supplies (sales invoices)
  Frequency: Monthly (11th) or Quarterly under QRMP (13th)
• GSTR-3B
  Who Files: Regular taxpayers
  Purpose: Summary return of tax liability & ITC claimed
  Frequency: Monthly (20th) or Quarterly under QRMP
• GSTR-2B
  Who Files: Auto-generated
  Purpose: ITC statement based on suppliers’ GSTR-1 filings
  Frequency: Monthly (auto)
• GSTR-4 & CMP-08
  Who Files: Composition dealers
  Purpose: CMP-08 for quarterly tax payment; GSTR-4 for annual return
  Frequency: CMP-08 Quarterly (18th); GSTR-4 Annually (30th April)
• GSTR-5 & GSTR-5A
  Who Files: Non-resident taxable persons / OIDAR providers
  Purpose: Sales, purchases, and tax paid
  Frequency: Monthly (20th)
• GSTR-6, GSTR-7 & GSTR-8
  Who Files: ISDs (GSTR-6), TDS deductors (GSTR-7), E-commerce operators (GSTR-8)
  Purpose: ITC distribution, TDS details, TCS collected
  Frequency: Monthly (10th/13th)
• GSTR-9 & GSTR-9C
  Who Files: Regular taxpayers (>₹2 Cr) / (>₹5 Cr for 9C)
  Purpose: Annual consolidated return and reconciliation statement
  Frequency: Annually (31st Dec)

Understanding Key GST Returns

GSTR-1 is your invoice-level sales data. Every B2B and B2C invoice goes here. Under QRMP, businesses with turnover ≤₹5 crore file quarterly but can use the Invoice Furnishing Facility (IFF) to upload B2B invoices in months 1 and 2 of the quarter—critical for your buyers’ ITC visibility. Miss the IFF window, and your buyer’s GSTR-2B won’t reflect those purchases until quarter-end. That delay costs them working capital.

GSTR-3B is the summary return where you declare output tax, claim ITC, and pay the net liability. As of 2026, GSTR-3B is auto-populated from your GSTR-1 and GSTR-2B data. Sounds convenient—until the auto-fill pulls in mismatched figures. More on that in the errors section.

GSTR-9 and GSTR-9C are annual reconciliation returns. If your turnover exceeds ₹5 crore, the 9C reconciliation statement is self-certified (no separate audit mandate since 2021, but the reconciliation rigor remains).

For a deeper breakdown: How to file GSTR-1 | Understanding GSTR-3B

Is GSTR-1 Monthly or Quarterly in 2026?

It depends on your turnover and scheme. Businesses with turnover ≤₹5 crore under QRMP file GSTR-1 quarterly by the 13th of the month following the quarter. Everyone else—monthly by the 11th. QRMP filers should use IFF for early B2B uploads; skipping it delays buyer ITC by up to 3 months. Late filing attracts ₹50/day capped at ₹10,000 per return.

GST Return Filing Process

The 2026 workflow is more automated than what most guides describe. Here’s how it actually works:

1. Generate compliant invoices with correct HSN/SAC codes (4-digit for turnover up to ₹5 Cr, 6-digit above). Your GST invoice format matters here—wrong codes trigger auto-scrutiny.
2. Upload invoices in GSTR-1 (or use IFF under QRMP for months 1-2). E-invoicing is mandatory for turnover >₹5 crore; these auto-populate GSTR-1 from the IRP.
3. Buyers see ITC in GSTR-2B. This is auto-generated—no action needed from the buyer. But verify it. Always verify it.
4. File GSTR-3B using the auto-populated summary. Cross-check ITC figures against your purchase register before submitting. The portal pre-fills from e-invoices and e-way bills, but mismatches happen.
5. Pay GST liability via the portal. Under QRMP, use PMT-06 for monthly tax payments in months 1-2, then settle the balance in GSTR-3B at quarter-end.
6. Use GSTR-1A to correct errors in GSTR-1 before filing GSTR-3B for that period. This correction mechanism (formalized post-2024) saves you from amendment headaches later.

Tactile cue: After GSTR-3B submission, the “File Return” button greys out and shows a green ARN confirmation. If it doesn’t—your payment didn’t process. Check the electronic cash ledger before assuming it went through.

GST Return Due Dates (2026)

• GSTR-1 (Monthly): 11th of next month
• GSTR-1 (QRMP): 13th of month after quarter
• IFF (QRMP Optional, Months 1-2): 13th of next month
• GSTR-3B (Monthly): 20th of next month
• GSTR-3B (QRMP): 22nd or 24th of month after quarter
• PMT-06 (QRMP Months 1-2): 25th of next month
• CMP-08: 18th of month after quarter
• GSTR-4: Annually, 30th April
• GSTR-9 & GSTR-9C: Annually, 31st December

Full calendar with state-wise staggering: GST return due dates

Recent GST Changes (2025–2026)

• Auto-population of GSTR-3B from GSTR-1 and GSTR-2B is now the default. Manual entry is still possible, but deviations from auto-filled figures trigger real-time monitoring alerts.
• GSTR-1A correction mechanism allows amendments to GSTR-1 data before the corresponding GSTR-3B is filed. Use it. It’s cleaner than post-facto amendments.
• 3-year time limit on filing old/pending returns. You cannot file returns older than 3 years from the due date—period. Backlog from 2022 or earlier is now locked.
• Real-time tracking by CBIC matches your GSTR-1 data against e-invoices, e-way bills, and banking transactions. Mismatches generate automated DRC-01 notices.
• E-invoicing threshold dropped to ₹5 crore turnover. If you crossed this threshold, your invoices must route through the Invoice Registration Portal.

Common GST Filing Mistakes (And How to Fix Them)

Other common mistakes:

• Filing GSTR-3B before GSTR-1 (breaks the auto-population chain)
• HSN/SAC code mismatches creating phantom liabilities in real-time scrutiny
• Claiming ITC on invoices not reflected in GSTR-2B
• Exceeding the ₹1.5 crore composition scheme threshold without switching to regular filing—triggers back-taxes with interest

Difference Between GSTR-1 and GSTR-3B

• Purpose
  GSTR-1: Report outward supplies (sales)
  GSTR-3B: Summary return with tax payment
• Data Level
  GSTR-1: Invoice-level detail
  GSTR-3B: Consolidated summary
• Frequency
  GSTR-1: Monthly or Quarterly (QRMP)
  GSTR-3B: Monthly or Quarterly (QRMP)
• ITC Impact
  GSTR-1: Feeds buyer’s GSTR-2B
  GSTR-3B: Where you claim ITC
• Correction
  GSTR-1: Via GSTR-1A before 3B filing
  GSTR-3B: Amendments in subsequent period

Detailed guides: GSTR-1 filing process | GSTR-3B format explained

How Accounting Software Helps with GST Returns

Manual GST filing works until it doesn’t. Once you’re reconciling GSTR-2B against 200+ purchase invoices monthly, or tracking PMT-06 deadlines across quarters, spreadsheets start breaking.

FAQs

How many GST returns does a regular taxpayer file per year?
A monthly filer submits 24 returns (12 GSTR-1 + 12 GSTR-3B) plus GSTR-9 annually. QRMP filers submit 8 (4 GSTR-1 + 4 GSTR-3B) plus PMT-06 payments in non-quarter months.

What happens if GST returns are not filed?
Late fees of ₹25/day (CGST + SGST) for NIL returns, ₹50/day for others—capped at ₹10,000 per return. Three consecutive missed returns trigger GSTIN suspension, blocking e-way bills and ITC claims.

Can GST returns be revised after filing?
GSTR-3B cannot be revised directly. Use GSTR-1A to correct GSTR-1 errors before filing that period’s GSTR-3B. Post-filing corrections go through amendments in the next period’s return.

How do I fix ITC mismatches in GSTR-2B?
Export your GSTR-2B, reconcile line-by-line against your purchase register. Flag invoices where supplier hasn’t filed GSTR-1. Follow up with the supplier or use the portal’s mismatch resolution tool. For persistent mismatches flagged via DRC-01, respond within 30 days with supporting documents.

Which GST return is filed monthly by all regular taxpayers?
GSTR-3B is the mandatory monthly summary return for all regular taxpayers not under QRMP. QRMP filers submit GSTR-3B quarterly but must pay monthly via PMT-06.

Do zero-sales businesses need to file GST returns?
Yes. Active GSTINs must file NIL GSTR-1 and GSTR-3B every period. The portal provides a simplified NIL filing option—it takes 2 minutes. Not filing risks suspension and blocks all downstream compliance.

What is the QRMP scheme eligibility for 2026?
Any taxpayer with aggregate turnover ≤₹5 crore in the previous financial year can opt in via their GST portal profile. Opt-in window opens at the start of each quarter.

Related GST Guides

• GST Registration Process in India
• GST Invoice Format & Requirements
• GSTR-1 Filing Guide
• GSTR-3B Format Explained
• GST Return Due Dates
• Input Tax Credit Under GST
• Place of Supply Rules

Conclusion: Streamlining GST Compliance in 2026

GST compliance in 2026 isn’t about memorizing return types—it’s about building a system that catches mismatches before the portal does. Whether you are filing GSTR-1, navigating the QRMP scheme, or reconciling GSTR-2B to protect your input tax credit, strict adherence to deadlines and accurate data entry are non-negotiable. Get your reconciliation workflow right, rely on automated matching to avoid DRC-01 notices, and everything else naturally follows.