GST Return Filing Due Dates: GSTR-1, 3B & QRMP Guide

Managing GST compliance across an enterprise is rarely about navigating abstract legal theories. In our daily audit and tax practice across Raipur, Bhilai, Sambalpur, and Kalahandi, we observe that the vast majority of GST notices, blocked input tax credits, interest demands, and cash flow bottlenecks stem from a far more preventable issue: missed statutory return deadlines and out-of-sequence filing.

Whether you operate a steel re-rolling mill in Urla or Bhanpuri, run a custom rice milling unit in Jayapatna, execute PWD infrastructure contracts across Chhattisgarh and Odisha, or manage a registered trade business, keeping track of GST deadlines is a core financial responsibility. A single day's delay in submitting GSTR-1 doesn't merely trigger late fees under Section 47—it blocks your corporate buyers from claiming Input Tax Credit (ITC) in their GSTR-2B, halts E-Way bill generation under Rule 138E, and damages your commercial relationships.

This master guide breaks down the complete GST return filing framework, statutory due dates, the QRMP scheme, Rule 59(6) sequential blocking, automated mismatch mechanisms under Rule 88C/88D, late fee mathematics, interest calculations under Section 50, and sector-specific compliance nuances for businesses operating in Chhattisgarh and Odisha.

---

1. Statutory Architecture of Monthly vs. QRMP Compliance

GST compliance is divided into two distinct filing operational tracks based on your aggregate annual turnover (AATO) and your chosen return frequency:

1. Regular Monthly Track: Mandatory for taxpayers with aggregate turnover exceeding ₹5 Crores in the preceding or current financial year, and optional for smaller taxpayers who choose monthly reporting to pass ITC smoothly to B2B buyers.
2. QRMP Track (Quarterly Return Monthly Payment): Available for small taxpayers with aggregate turnover up to ₹5 Crores. Under this scheme, taxpayers file GSTR-1 and GSTR-3B once per quarter while paying estimated tax monthly via Form GST PMT-06.

The Rule 59(6) Sequential Filing Mandate

The GST portal enforces strict sequential filing controls under Rule 59(6) of the CGST Rules:

• GSTR-1 Blocking: You cannot file GSTR-1 for the current month/quarter if GSTR-3B for the preceding tax period has not been submitted.
• IFF Blocking: A QRMP taxpayer cannot upload B2B invoices using the Invoice Furnishing Facility (IFF) for Month 1 or Month 2 if the previous quarter's GSTR-3B is pending.
• Cascading Interruption: If an unfiled return blocks your GSTR-1, your customers cannot view your invoices in their monthly GSTR-2B. Consequently, they withhold vendor payments until your compliance status clears.

---

2. GST Return Compliance Lifecycle & Process Matrix

The process matrix below maps the operational decision framework, statutory milestones, and monthly workflow for both regular monthly filers and QRMP taxpayers across Chhattisgarh and Odisha.

---

3. Master GST Return Filing Due Dates & Penalty Matrix

The table below details statutory return types, turnover applicability, filing frequencies, statutory due dates, and applicable non-compliance consequences under the CGST/SGST Acts.

---

4. In-Depth Breakdown of Key Returns & Mechanisms

GSTR-1: Reporting Outward Supplies

GSTR-1 is the statutory statement of outward supplies. It records all B2B invoices, B2C sales summaries, credit/debit notes, zero-rated export supplies, and advance adjustments.

• Monthly Due Date (11th): Regular taxpayers must file GSTR-1 by the 11th of the succeeding month. For example, July GSTR-1 must be filed by August 11th.
• Quarterly Due Date under QRMP (13th): QRMP taxpayers file GSTR-1 by the 13th of the month following the end of the quarter (e.g., Q1 April-June GSTR-1 is due on July 13th).
• Invoice Furnishing Facility (IFF): To prevent cash flow friction for B2B buyers who require monthly ITC credits, QRMP taxpayers can upload B2B invoices for Month 1 and Month 2 using the IFF between the 1st and 13th of the next month (capped at ₹50 Lakhs per month). Invoices uploaded via IFF do not need to be re-entered in the quarterly GSTR-1.

GSTR-3B: Tax Calculation & Summary Return

GSTR-3B is a self-assessed summary return used to declare total turnover, tax liability, eligible Input Tax Credit, reversed ITC, and tax payments made through cash and credit ledgers.

• Monthly Due Date (20th): Regular taxpayers file and settle liabilities by the 20th of the following month.
• QRMP Quarterly Due Dates (State-Wise Categorization):
  • Group 1 / Category X States (Due Date: 22nd): Includes Chhattisgarh, Madhya Pradesh, Gujarat, Maharashtra, Karnataka, Telangana, Andhra Pradesh, Tamil Nadu, and Goa.
  • Group 2 / Category Y States (Due Date: 24th): Includes Odisha, West Bengal, Jharkhand, Bihar, Uttar Pradesh, Haryana, Delhi, Assam, and Punjab.

This state-wise split is crucial for multi-state enterprises. An entity headquartered in Raipur with a branch in Jharsuguda or Jayapatna operates under two separate deadlines for its quarterly GSTR-3B filings: 22nd for Chhattisgarh (GSTIN prefix 22) and 24th for Odisha (GSTIN prefix 21).

QRMP Payment Mechanics: Form GST PMT-06

Taxpayers under the QRMP scheme must deposit tax liability for the first two months (Month 1 and Month 2) of each quarter by the 25th of the succeeding month using Form GST PMT-06.

Taxpayers can choose between two calculation methods for monthly payments:

1. Fixed Sum Method (System-Generated Auto-Challan):
   • If the previous quarter's return was filed quarterly: The system generates a pre-filled challan equal to 35% of the net cash tax paid in the preceding quarter's GSTR-3B.
   • If the previous month's return was filed monthly (e.g., taxpayer just opted into QRMP): The challan equals 100% of the net cash tax paid in the last month's GSTR-3B.
   • Advantage: If you deposit the exact Fixed Sum amount by the 25th, no interest is charged under Section 50(1) for Month 1 and Month 2, even if the actual liability evaluated at the quarter-end turns out to be higher!
2. Self-Assessment Method:
   • The taxpayer calculates the actual cash liability after considering current sales, purchases, available Electronic Credit Ledger balance, and ITC reflected in GSTR-2B.
   • Risk: If self-assessment undercalculates the actual monthly cash liability, interest at 18% p.a. accrues on the shortfall from the 26th until the date of payment or quarterly filing.

---

5. Automated System Controls: Rule 88C (DRC-01B) and Rule 88D (DRC-01C)

Tax compliance is monitored by automated portal cross-checks designed to catch discrepancies instantly.

Rule 88C & Form DRC-01B (GSTR-1 vs. GSTR-3B Liability Mismatch)

When tax liability declared in GSTR-1 (or IFF) exceeds the tax paid in GSTR-3B by a system-defined threshold (currently exceeding ₹25 Lakhs and 20% variance):

1. The portal generates an automated notice in Form DRC-01B Part A.
2. The taxpayer receives an SMS and email alert to either pay the differential tax liability along with Section 50 interest or submit an explanation in Form DRC-01B Part B within 7 days.
3. Severe Consequence: If the taxpayer neither pays nor files a valid explanation within 7 days, the portal automatically blocks GSTR-1 / IFF filing for subsequent periods under Rule 59(6)(d).

Rule 88D & Form DRC-01C (GSTR-2B vs. GSTR-3B ITC Mismatch)

When Input Tax Credit claimed in GSTR-3B exceeds the eligible ITC auto-populated in Form GSTR-2B:

1. The portal issues Form DRC-01C Part A.
2. The taxpayer must either deposit the excess ITC claimed (with interest under Section 50(3)) via Form GST DRC-03 or provide a detailed reconciliation in Form DRC-01C Part B within 7 days.
3. Failure to respond leads to recovery proceedings under Section 79 and potential blocking of credit ledgers.

---

6. Financial Consequences: Late Fees & Interest Calculations

A. Late Fee Framework under Section 47

Late fees accumulate automatically for every day a return remains unfiled beyond the statutory deadline. They are auto-calculated and added to the liability ledger of the subsequent GSTR-3B return.

Daily Late Fee Rates:

• Taxable Returns (Any tax liability or turnover): ₹50 per day (₹25 CGST + ₹25 SGST).
• Nil Returns (Zero outward supply, zero ITC, zero liability): ₹20 per day (₹10 CGST + ₹10 SGST).

Statutory Late Fee Caps per Return (Amended Relief Caps):

To protect small and medium enterprises, the government capped maximum late fees per return under Section 47 based on Aggregate Annual Turnover (AATO):

1. Nil Returns (All Taxpayers): Capped at ₹500 per return (₹250 CGST + ₹250 SGST).
2. AATO up to ₹1.5 Crores: Capped at ₹2,000 per return (₹1,000 CGST + ₹1,000 SGST).
3. AATO between ₹1.5 Crores and ₹5 Crores: Capped at ₹5,000 per return (₹2,500 CGST + ₹2,500 SGST).
4. AATO above ₹5 Crores: Capped at ₹10,000 per return (₹5,000 CGST + ₹5,000 SGST).

B. Interest Math under Section 50

1. Delayed Cash Tax Payment — Section 50(1) @ 18% p.a.

Interest under Section 50(1) applies when a taxpayer files GSTR-3B after the due date or underpays tax in PMT-06.

• Net Cash Basis: Interest is calculated strictly on the net cash liability paid through the Electronic Cash Ledger (after deducting eligible ITC utilized from the Electronic Credit Ledger), provided the return is filed voluntarily before receiving a Section 73/74 notice.
• Formula:

Statutory Formula: Interest = Net Cash Liability × (18 ÷ 100) × (Days of Delay ÷ 365)`

2. Ineligible ITC Availed and Utilized — Section 50(3) @ 24% p.a.

If a taxpayer claims excess ITC in GSTR-3B that was not available in GSTR-2B AND uses that credit to offset output tax liability:

• Interest is charged at 24% per annum from the date of use until the date of reversal via DRC-03.
• Note: If excess ITC was merely availed (claimed in return) but maintained as a balance in the Electronic Credit Ledger without being utilized, no interest is payable under amended Section 50(3) (retrospective from July 1, 2017).

---

7. Sector-Specific Compliance Nuances in Chhattisgarh & Odisha

Ground-level business models across Chhattisgarh and Odisha present unique operational workflows that directly impact GST return filing strategy.

Custom Rice Millers (Kalahandi, Jayapatna, Bargarh, Dhamtari)

Rice millers executing Custom Milled Rice (CMR) contracts for state agencies like OSCSC (Odisha) or CG State Civil Supplies Corporation handle complex tax flows:

• Milling Charges: Taxable under job work (GST @ 5%).
• By-products & Packing Material: Sales of broken rice, bran, and husk must be correctly classified under exempt/taxable HSN codes. Input credit on gunny bags (5% or 18%) must be reconciled monthly.
• Filing Caution: Delayed GSTR-1 filing by millers prevents state agencies from verifying job work invoices, leading to blocked payments and delayed milling bill disbursements.

Steel Rerolling & Sponge Iron Units (Urla, Bhanpuri, Durg-Bhilai)

Industrial manufacturing units in central Chhattisgarh purchase scrap, iron ore pellets, and coal from diverse suppliers:

• Vendor Non-Compliance: Unregistered scrap suppliers or default by sellers in filing GSTR-1 directly impacts the mill's GSTR-2B.
• Action Plan: Establish strict vendor payment terms—withhold the GST component of vendor invoices until the credit reflects in auto-generated GSTR-2B.

PWD Civil Infrastructure Contractors (Chhattisgarh & Odisha)

Contractors working with PWD, CPWD, Water Resources, or Railway departments have 2% GST TDS deducted under Section 51 by government departments:

• TDS Credit Claim: Government departments file Form GSTR-7. Contractors must accept these credits on the GST portal under the TDS/TCS Credit Received tab.
• Accepted credits transfer directly to the contractor's Electronic Cash Ledger, which can be utilized to settle GSTR-3B cash tax liability on the 20th/22nd/24th.

Real Estate Developers under CG RERA

Promoters building residential or commercial projects in Raipur, Bilaspur, or Durg-Bhilai operate under special GST rates (1% for affordable housing, 5% for non-affordable housing) without Input Tax Credit:

• 80% Procurement Rule: Developers must purchase at least 80% of total inputs and input services from GST-registered vendors. Shortfalls require paying tax at 18% under Reverse Charge Mechanism (RCM) via PMT-06/GSTR-3B at the end of the financial year.

---

8. Actionable Monthly Compliance Checklist for Accounts Teams

To ensure 100% error-free filing and eliminate late fees, corporate accounts departments should follow this monthly schedule:

• Day 1 to 7 (Data Preparation): Close the monthly sales ledger, verify debit/credit notes, ensure HSN-wise summary accuracy, and validate E-Way bill reconciliations.
• Day 8 to 11 (Outward Reporting): File GSTR-1 for regular filers by the 11th. Submit IFF for QRMP taxpayers by the 13th.
• Day 14 (GSTR-2B Generation & Matching): Download GSTR-2B generated on the 14th. Run automated purchase ledger reconciliation against GSTR-2B. Flag unfiled vendor invoices immediately.
• Day 15 to 20/22/24 (Tax Settlement): Calculate net cash liability after adjusting valid ITC. Make cash deposits into the Electronic Cash Ledger and file GSTR-3B on or before the due date (20th for monthly; 22nd for CG QRMP; 24th for Odisha QRMP).
• Day 25 (QRMP Monthly Tax Deposit): For QRMP taxpayers, calculate and pay Month 1 / Month 2 tax using Form GST PMT-06.

---

Partnering with Rabi Agrawal & Associates

Navigating complex GST return schedules, managing GSTR-2B reconciliation mismatches, responding to automated DRC-01B/DRC-01C notices, and managing multi-state registrations requires proactive statutory oversight.

At Rabi Agrawal & Associates, our dedicated GST advisory practice provides end-to-end tax compliance, automated ITC reconciliation, QRMP management, annual GSTR-9/9C filings, and representation before GST departmental officers across Chhattisgarh and Odisha.

Contact our practice offices in Raipur (CG) or Jayapatna / Kalahandi (Odisha) to audit your GST compliance setup and establish a smooth monthly filing routine for your business.

---

Related Advisory Services & Practice Guides

• Access expert statutory assistance for GST return filing service with our senior Chartered Accountants.
• Access expert statutory assistance for GST advisory service with our senior Chartered Accountants.