GST Return Filing Guide 2026: GSTR-1, 3B & 9 Explained – AFS

GST Return Filing Explained – GSTR-1, GSTR-3B, GSTR-9 (Acumen Financial Solutions, AFS)

Executive Summary

This comprehensive report, prepared by Acumen Financial Solutions (AFS), examines the filing of key GST returns in India – GSTR-1, GSTR-3B, and GSTR-9 – including their purposes, filing requirements, due dates, recent amendments, and compliance best practices. We identify the latest changes (notifications/circulars and rulings) affecting these forms, such as annual return exemptions and reconciliation rule changes, with precise effective dates and citations. Practical guidance is provided on error-avoidance, reconciliation, and responding to GST notices. We include illustrative tables (e.g. for reconciliation of GSTR-1 vs GSTR-3B vs GSTR-9) and templates (notice response checklist), as well as a Mermaid flowchart of the filing workflow. A timeline chart of recent due date changes is shown below. We also recommend leading software/tools and workflows (with a comparison table) to help AFS and its clients streamline GST compliance. All data is drawn from authoritative sources (CBIC, GST Council, ICAI, etc.) and is current as of 2026.

Figure: Timeline of GSTR-3B due dates for FY 2023-24 (showing extensions and interest rates). This illustrates how deadlines have shifted over time (source: NJ Jain).

Introduction

Goods and Services Tax (GST) registered businesses in India must comply with multiple return filings: primarily GSTR-1 (details of outward supplies), GSTR-3B (monthly/quarterly summary of tax liabilities and credits), and GSTR-9 (annual return). Acumen Financial Solutions (AFS) provides expert advisory services to ensure clients meet these obligations accurately and on time. This article explains in detail the purpose, eligibility, due dates, fees/penalties, and interplay of GSTR-1, 3B, and 9. We highlight recent amendments and notifications (past 3 years) that affect these returns, including thresholds for filing and due date extensions, with citations to official documents. We also cover best practices – e.g. reconciliation checklists, preventive measures to avoid notices, and response steps if notices arrive – tailored for GST businesses. Finally, we recommend GST compliance tools and design a workflow to support efficient services at AFS.

Form GSTR-1: Details of Outward Supplies

Purpose and Scope. Form GSTR-1 is the monthly/quarterly return of outward supplies. It captures invoice-level and summary details of all taxable sales, exports, and exempt supplies. This form auto-populates the purchase-side returns (ITC statements) for recipients, and is the basis for the taxpayer’s summary tax calculation. GSTR-1 must be filed even if there are no transactions (a nil return). Exempted categories include composition scheme taxpayers, non-resident foreign taxpayers, ISDs, TDS deductors, and e-commerce operators collecting TCS.

Who must file. All normal (regular) taxpayers registered under GST must file GSTR-1 for every tax period. Those opting into the Quarterly Return Monthly Payment (QRMP) scheme (for turnover ≤₹5 crore) file GSTR-1 quarterly; others file monthly.

Frequency and Due Dates. For monthly filers, GSTR-1 is due on the 11th day of the succeeding month (this was extended from the earlier 10th to harmonize with GSTR-3B filing). For quarterly filers (under QRMP or small taxpayers), it is due by the 13th day of the month succeeding the quarter. For example, the return for March 2021 was due by 11 April 2021, and Q4 2020-21 by 13 April 2021. These dates are prescribed by Rule 80 of the CGST Rules (supported by Section 44 of the CGST Act). The Government may extend due dates via notifications; for instance, the March 2024 GSTR-1 due date was extended to 12 April 2024.

Late Fees / Penalties. Until 2019, late fees were ₹100 per day (each for CGST and SGST, total ₹200/day). The GST Council and CBIC have since rationalized these: currently, a delayed GSTR-1 attracts a late fee of ₹50 per day (i.e. ₹25 CGST + ₹25 SGST). (Nil returns attract ₹20 per day total.) Late fees for GSTR-1 are capped at 0.50% of the annual turnover for each Act. Failure to file GSTR-1 on time may also trigger notices and interest liabilities indirectly (via GSTR-3B mismatches).

Amendments and Revisions. If errors are detected after filing, GSTR-1 can be amended through subsequent returns within statutory cut-offs. All changes up to the November following the financial year-end are allowed. After that cut-off, certain fields (like HSN details) become locked. Importantly, recent legal rulings (e.g. CBIC vs. Aberdare Technologies (SC 2024) and ITI Ltd v. UOI (Gauhati HC 2026)) emphasize that taxpayers may correct inadvertent errors in GSTR-1 even after filing, and that a mismatch between GSTR-1 and GSTR-3B (due to such errors) should not automatically be treated as undeclared tax.

Interplay with GSTR-3B. Data from GSTR-1 (outward sales) feeds into the taxpayer’s GSTR-3B summary. In practice, the GSTR-1 figures for sales and taxable values must reconcile with the figures declared in GSTR-3B (Table 3.1). Any mismatch – e.g. supplies reported at 18% in GSTR-1 but 12% in GSTR-3B – needs justification or correction. Businesses should routinely reconcile GSTR-1 vs GSTR-3B (and GSTR-2A/2B) to spot and fix discrepancies early, to avoid notices. A reconciliation table (example below) can be maintained monthly.

Metric / ItemSum from GSTR-1Sum from GSTR-3BDifferenceRemarks / ExplanationTotal taxable sales (₹)10,000,0009,950,000–50,000Credit Note not captured in 3B (invoice omitted)IGST on exports (₹)2,000,0002,000,0000Matches (full zero-rated exports)Inter-state B2C supplies (₹)1,000,0001,020,000+20,000U/C to E-way Bills, misclassified ?Reversal (HSN 9987) (₹)030,000+30,000ITC reversal done in 3B not in GSTR-1

Best Practices. To ensure smooth GSTR-1 filing, maintain a month-end checklist: 1) finalize sales invoices; 2) classify HSN/SAC codes correctly; 3) enter credit/debit notes timely; 4) review the aggregate turnover against books; 5) cross-verify advance adjustments. Utilize accounting/GST software to auto-populate GSTR-1 data and catch missing invoices. For large taxpayers, splitting filing by state (if principal place in List A vs List B, it affects 22nd vs 24th due date for 3B) is crucial.

Form GSTR-3B: Monthly Summary Return

Purpose and Scope. Form GSTR-3B is a simple monthly (or quarterly) self-declared return for GST liability. Every regular or casual taxpayer must file GSTR-3B in each period (even if no transactions). It summarizes taxable outward supplies, inward supplies on which reverse charge is paid, and eligible Input Tax Credit (ITC), then computes net tax due/payable. Unlike GSTR-1, GSTR-3B is not auto-populated by GSTN; instead, the taxpayer manually fills totals (or via software import).

Who must file. All normal and casual registered persons must file GSTR-3B. Exemptions include: composition scheme taxpayers (file CMP-08 instead), ISDs, non-resident OIDAR service providers, TDS deductors (who pay via Form GSTR-7), and TCS collectors (GSTR-8 filers).

Frequency and Due Dates. GSTR-3B is typically monthly for most taxpayers, with payment due and filing due for each month’s taxes. The standard due date is the 20th day of the following month. However, as per Notification No. 07/2020-CT (dated 03.02.2020), due dates were staggered: taxpayers with aggregate turnover above ₹5 crore (in preceding FY) must file by the 20th of next month, while those up to ₹5 crore follow state-specific dates (22nd/24th as listed). For QRMP-enrolled small taxpayers, GSTR-3B is filed quarterly (instead of monthly) by the 22nd/24th day of the month after the quarter (List A states by 22nd, List B by 24th). All due dates are subject to notification; for example, CBIC extended the September 2025 GSTR-3B deadline to 25 October 2025.

Late Fees, Interest and Penalties. Filing GSTR-3B late attracts a late fee of ₹50 per day (₹25 CGST + ₹25 SGST) (nil-return filers pay ₹20 total). Interest at 18% p.a. applies on any unpaid tax from the due date until payment. Notably, since 1 June 2021, the CBIC has allowed certain conditional late fee waivers for past delays, but as of 2022 the standard rates apply. Under Section 47 CGST, late fee is capped at 0.25% of total turnover or ₹5,000 (whichever is lower) for each Act.

Recent Amendments. Key notifications affecting GSTR-3B include:

• Notifications 18/2021-CT & 19/2021-CT (1 June 2021): Rationalised late fees and waived fees for specified past periods.

• Notification 17/2025-CT (18 Oct 2025): CBIC extended the due date for Sept 2025 GSTR-3B to 25 Oct 2025, and aligned quarterly and monthly filing deadlines.

No fundamental change in format has occurred recently; the form remains a 10-item summary (Table 3.1 for supplies and Table 4A–4D for ITC). However, the GST portal auto-populates much of ITC in Table 4A/4B (from supplier GSTR-1s) and 4C (from GSTR-2B) for convenience. New guidelines (Dec 2025) lock the auto-populated Table 3.2 data (previous month’s supplies to unregistered persons) from editing, to prevent back-dating credits. Taxpayers should file the correct data or amend GSTR-1 prior to GSTR-3B to avoid mis-reporting.

Interplay with GSTR-1 and GSTR-9. GSTR-3B depends on details reported in GSTR-1 (outward sales) and on inward supplies reported by vendors (seen in GSTR-2A/2B). A consistent practice is to reconcile GSTR-3B with (a) GSTR-1 (outward), (b) books of account, and (c) GSTR-2B (auto ITC). Mismatches can trigger notices under Section 75(12) (especially if GSTR-1 shows more tax than GSTR-3B). Recent rulings (e.g. Deepa Traders (Madras HC 2025) and Aberdare Technologies (Bombay HC 2024)) have held that taxpayers should be allowed to explain/correct genuine errors. Nevertheless, it is essential to track differences. For instance, if the output tax on GSTR-1 exceeds GSTR-3B by ₹100,000, the taxpayer should check if a credit note or input was missed, and make corrective filings before the annual return.

Figure: Filing obligations for GSTR-3B by monthly vs quarterly (QRMP) taxpayers.

Best Practices. High-accuracy filing of GSTR-3B requires disciplined processes:

• Monthly Reconciliation: Reconcile book sales and purchases with GSTR-1 and GSTR-2B before filing GSTR-3B. Track returns status for each GSTIN separately.

• Auto-population Check: Review the auto-filled ITC values in GSTR-3B (Tables 4A/4B from GSTR-2A/2B) for omissions or errors.

• Timely Amendments: If an invoice or credit note was missed in GSTR-1, use Form GSTR-1 amendment (or GSTR-3B explanation) before the filing date to prevent mismatch.

• System Locking: Note that liability fields auto-lock; ensure all liability (Table 3.1) is correctly declared as CT/UT/IGST. Hard-locking of “tax liability breakup” on the portal (from July 2025) means the taxpayer must confirm auto-filled entries and click “Save”.

• Quarterly Scheme Checks: Quarterly filers must pay tax by 25th (QRMP rules) even if return is by 22/24; missed interest can accrue.

• Interest Calculation: Always calculate interest (18%) on any delayed payment of tax before filing GSTR-3B (as portal does not auto-add it; taxpayers must declare under Interest Table and make payment).

• Documentation: Maintain audit trails (e.g. ledger exports) and backup of each GSTR-3B filed.

Form GSTR-9: Annual Return (and GSTR-9C)

Purpose and Scope. GSTR-9 is the annual return consolidating all transactions of a financial year. It requires summarizing annual outward and inward supplies, tax paid, and ITC claimed, matching details across GSTR-1, GSTR-2B, and GSTR-3B. It includes sections on turnover, taxes paid, refunds, and a reconciliation statement for year-end adjustments. For businesses crossing the audit threshold, Form GSTR-9C (reconciliation statement) must accompany GSTR-9.

Who must file. Originally, all regular taxpayers (except composition) were to file GSTR-9, with GSTR-9C if their turnover exceeded ₹2 crore (audit). Notifications have raised and ultimately removed these thresholds. Currently (FY 2024-25 onward), GSTR-9 is mandatory only for turnover >₹2 crore per annum. Turnover upto ₹2 crore is permanently exempt from filing GSTR-9 (Notification 15/2025, effective FY24-25). Nevertheless, firms may choose to file voluntarily. The following are not required to file GSTR-9: composition dealers (file GSTR-9A instead), casual taxable persons, non-resident taxable persons, ISDs, TDS deductors and TCS collectors.

For GSTR-9C (Audit Form), the threshold was raised to ₹5 crore from 1 Aug 2021. Thus, any taxpayer (exceeding ₹5cr turnover) who is required to file GSTR-9 must also submit a self-certified reconciliation (formerly an audited statement) in GSTR-9C. (Previously the threshold was ₹2 crore.) Taxpayers with ≤₹5 crore turnover file just GSTR-9 (no 9C needed).

Due Dates and Late Fees. The due date for filing GSTR-9 (and GSTR-9C, if applicable) is 31st December of the next financial year. For example, FY 2024-25 GSTR-9 was due by 31 Dec 2025, FY 2025-26 by 31 Dec 2026. These deadlines derive from Section 44 CGST and Rule 80. Late filing attracts a hefty fee: ₹200 per day (₹100 CGST + ₹100 SGST), capped at 0.25% of turnover (of the respective State/UT) under Section 47(2). For example, a delay of 5 days would cost ₹1,000 (CGST+SGST combined). Interest does not apply since GSTR-9 itself does not involve tax payment (the taxes were paid monthly).

Recent relief: Vide Notification 08/2025-CT (23 Jan 2025), the CBIC waived any excess late fees for all annual returns of FY 2017-18 through 2022-23, provided they are filed by 31 Mar 2025. Earlier (March 2023), late fee beyond ₹20,000 total (₹10k each CGST/SGST) was waived for FY17-18 to FY21-22 if filed between 1 Apr and 30 June 2023. These schemes have lapsed; normal fees apply now.

Reconciliation Requirements. Form GSTR-9 compels taxpayers to cross-verify their annual data. Part III of GSTR-9, for example, requires reconciling the total turnover declared in GSTR-3B with that in GSTR-1 (and books). Part V asks for ITC reconciliation between GSTR-3B and GSTR-2A/2B. Part VI deals with tax paid differences. In practice, taxpayers should run an annual reconciliation worksheet: tally total outward supplies (per books) vs GSTR-1; total ITC claimed vs GSTR-2B; and highlight differences. Any short-payment of tax or excess ITC claim must be corrected by payment (via DRC-03 form) before filing GSTR-9. The table below exemplifies the reconciliation:

ItemTotal (GST Portal)Total (Books)DifferenceAction RequiredAnnual Taxable Turnover₹75,000,000₹75,500,000+₹500,000Investigate ₹500k sales not captured (adjust GSTR-1/Q1–Q4 or pay tax via DRC-03)Total ITC Claimed (FY)₹10,000,000₹10,050,000–₹50,000Verify if ₹50k ITC missing (check invoices GSTR-2B, possibly amend GSTR-1 or pay in GSTR-3B)Tax Paid (CGST+SGST) (per GSTR-3B)₹7,000,000₹7,050,000+₹50,000Ensure ₹50k was actually paid or file amendmentTax Refund Claimed/Received000(No action)

Forms GSTR-9A and 9B. (For completeness: Regular composition scheme taxpayers have a simpler annual return, GSTR-9A, which was replaced by GSTR-4 from FY19-20. E-commerce operators liable for TCS must file GSTR-9B, though this is currently in abeyance.)

Recent Amendments, Notifications and Rulings (2023–2026)

Over the last three years, several key changes have affected these returns:

• Annual Return Exemption (2Cr threshold): Notification No. 15/2025-CT dated 17 Sep 2025 permanently exempts all taxpayers with annual turnover up to ₹2 crore from filing GSTR-9 (and GSTR-9C) from FY 2024-25 onwards. This followed earlier one-year exemptions. CBIC’s Notification 15/2025 (effective 17.9.2025) reads: “the Commissioner hereby exempts the registered person whose aggregate turnover in any financial year is up to two crore rupees, from filing annual return for that year”.

• Audit Threshold Raised (5Cr): Via CBIC Clarification/Circular (No. 246/03/2025 dated 27 Mar 2025), the audit threshold (requiring GSTR-9C) was confirmed as ₹5 crore (for FY 2021-22 onwards). Rule 80(3) was thus amended: prior to 01.08.2021, ITC audit/GSTR-9C was required if turnover >₹2cr; from 1.8.2021 onward it applies only if turnover >₹5cr.

• Due Date Extensions (COVID and Region-specific): Occasional extensions continue. For instance, CBIC Notification 30/2024-CT (20 Nov 2024) extended the October 2024 GSTR-3B deadline to 11 Dec 2024 for taxpayers in Murshidabad district (West Bengal). Such district-level reliefs are often granted post-facto. Generally, after the COVID-era extensions, due dates have stabilized, but taxpayers should monitor CBIC notifications for any new relief (especially around elections or disasters).

• Late Fee Amnesty (GSTR-9): As noted, Notification 08/2025-CT (23 Jan 2025) waived any excess late fee for annual returns up to FY 2022-23. Also, Notification 7/2023-CT (31 Mar 2023) partially waived late fees beyond ₹10,000 per Act if annual returns (FY17-22) were filed by 30 Jun 2023. CBIC Circular No. 246/03/2025 (Mar 2025) consolidates these amnesty provisions.

• GSTR-1 Due Date Shift: The due date for GSTR-1 was shifted from the 10th to the 11th of the next month from 2021, aligning with GSTR-3B schedules. On rare occasions (month-end/holiday issues), CBIC has notified one-day extensions (e.g. for March 2024 period to 12 Apr 2024).

• Form Changes: For FY 2024-25, CBIC issued Notification 13/2025-CT (mid-2025) introducing new fields in GSTR-9 (e.g. special disclosures on ITC) and Notification 16/2025-CT revising GSTR-9 format for IMS-based auto-population. These changes do not alter due dates but affect preparation.

• Judicial Precedents: High Court rulings have clarified that GSTR-1/3B mismatches caused by errors should be resolved by allowing amendments rather than taxing the difference. E.g., in M/s ITI Ltd v. UOI (Gauhati HC, March 2026), the court held that differences due to a “human error” in GSTR-1 (corrected in GSTR-3B) did not create a new tax liability, and the tax authority was directed to grant the taxpayer a chance to explain and correct the return. This aligns with the Supreme Court’s stance in CBIC vs. Aberdare Technologies (2024), allowing GSTR-1 rectifications. Such precedents support taxpayers under audit to argue reconciliation issues are rectifiable discrepancies, not concealed tax.

Best Practices and Compliance Safeguards

Businesses can greatly reduce errors and notices by adopting the following high-accuracy measures:

• Maintain a Compliance Calendar: Track deadlines for GSTR-1, GSTR-3B (20th or 22nd/24th), GSTR-9 annually. Note any state-specific QRMP dates. Use reminders well before due dates.

• Regular Reconciliation: Each month, reconcile sales ledger with GSTR-1 and purchase ledger (input) with GSTR-2B. Also match GSTR-1 totals vs. GSTR-3B output tax, and GSTR-2B ITC vs. GSTR-3B input tax. Early detection of mismatches (as little as ₹1000) allows correction in time. Software tools with GSTR-2B auto-import can highlight differences.

• Data Accuracy: Ensure invoice data (HSN/SAC, tax rate, reverse charge flags) is correct in accounting. Misclassification (e.g. declaring services as goods) often leads to GSTR-1/3B differences.

• Auto-population Review: Before submission, check the GSTR-3B auto-populated values (Table 4A) against expected data. Manually adjust if the portal values appear outdated or missing an entry.

• Adjustment of Advances: Properly account for advances and their utilization in GSTR-1 and GSTR-3B (Tables 6A/6B of 3B). Failure to report advance receipts can trigger notices.

• Document Retention: Keep signed copies of filed returns, portal acknowledgements, and e-way bill records. Store copies of all inward and outward invoices corresponding to filed data.

• Internal Controls: Implement a two-step filing review – preparation by one team (or software) and review by another (CA or senior manager). Use GSTN’s offline tools (json or Excel) for backup.

• Automated Alerts: Use GST compliance software that flags issues (e.g. missing invoices, tax liability changes) and generates alert emails.

• Training and Updates: Regularly train accounts staff on GST rules (e.g. changes in ITC eligibility, late fee reductions) and subscribe to official CBIC/ICAI updates.

• Preventing Notices: Key preventive measures include timely payment of tax to avoid interest notices, ensuring any TDS/TCS compliance (Form GSTR-7/8) is up-to-date, and voluntarily correcting errors if identified. For example, if inward supplies on reverse charge were underreported, paying that tax in the next GSTR-3B proactively avoids a demand

By adhering to these controls, businesses and their advisors (such as AFS) create an audit trail showing due diligence. Regular reconciliations and transparent adjustments minimize the risk of show-cause notices for under-reporting or wrongful claims.

Responding to GST Notices – Checklist and Best Response Steps

Despite precautions, notices (like SCNs or Condonation orders) may be received. A systematic approach is essential:

StepActionDetails/Notes1. Acknowledge ReceiptLog date received, type (SCN, Demand, etc).Note sanctioning authority and demand period.2. Analyze AllegationsIdentify discrepancies cited (form numbers, amounts).Cross-check with GSTR-1/3B/9 records.3. Gather DocumentsCollect invoices, GSTR-1/3B/9 acknowledgments, GST payment challans, reconciliations.Ensure complete file for audit trail.4. Compute ImpactQuantify the difference: tax shortfall, interest, penalty calculated.Include any inadvertent mistakes (e.g. wrong HSN).5. Draft Reply LetterPrepare a structured response.Include references to rules/notifications. Provide facts and justification for differences (human error, technical glitch).6. Rectify if NeededIf an error is admitted (e.g. missing invoice), voluntarily file a rectification (GSTR-1 amendment) or pay tax via DRC-03 before reply.Show proactive compliance.7. Submit ReplyRespond within stipulated time (usually 15-30 days). Attach affidavits/reconciliations.If unable to meet deadline, seek extension proactively.8. Follow-up HearingIf department issues show-cause, ensure representation (through CA or advocate) at any hearing.Use SCs like Aberdare or ITI Ltd if relevant.9. Keep Communication RecordMaintain all correspondence and acknowledgments.Use registered post/email trackable methods.10. Appeal/RevisionIf order is against you, consider filing an appeal or revisional application as per Sections 107/108/112 of CGST Act.Seek legal advice immediately.

Figure: Sample notice-response checklist. This checklist helps avoid missed deadlines or incomplete replies. Notably, the Supreme Court and various High Courts have held that notices purely on GSTR-1 vs 3B mismatches (without showing evasion) often fail; citing such jurisprudence in the reply can strengthen the position.

Tables and Templates

GSTR-1 vs GSTR-3B vs GSTR-9 Reconciliation Table (Example). This example (as above) shows how to tabulate differences in a year-end sheet. It can be extended with additional rows (e.g. Ineligible ITC, Rounding Off differences). Having such a table helps in drafting GSTR-9: each difference leads to either a field in GSTR-9 or an annexure/footnote to explain.

Notice Response Checklist (see above table). Use as standard form for any SCN. Always reference exact clause/section (e.g. “GST Section 16(4) – ITC time limit”, or Notification numbers). Example references:

• If the notice alleges delay in claiming ITC, mention that as of 01.07.2024, section 16(5) overrides old 16(4) time-limits for FY 2018-19 onwards, as per Finance Act 2024 and CBIC Notification 17/2024-CT.

• If the notice is about GSTR-1 vs 3B mismatch, point to M/s ITI Ltd (2026) and Aberdare Tech. (2024) jurisprudence to assert rights to correct.

Compliance Timeline (Monthly/Quarterly/Annual). It helps to have a schedule table, e.g.:

Return/FormFrequencyDue Date (Normal)Year-EndGSTR-1Monthly11th of next monthGSTR-1Quarterly13th of month after quarterGSTR-3BMonthly20th of next monthGSTR-3B (QRMP)Quarterly22nd/24th of month after quarterGSTR-9Annual31 Dec next yearfor FY 2024-25: 31 Dec 2025GSTR-9CAnnualSame as GSTR-9 (31 Dec)if turnover >₹5cr

This timeline ensures all returns and any audit (9C) are completed in order. Note that GSTR-9C (audit) is filed along with GSTR-9, and late-filing consequences accrue once the GSTR-9 due date passes.

Recommended Software Tools and Workflow

Modern GST compliance leverages software. We recommend AFS consider the following options for client services:

Software/ToolKey FeaturesApprox. Cost (INR)Best ForTallyPrime with GST Module Full accounting + integrated GST return filing; e-invoicing, e-waybill connectivity; reconciliation reports₹18,000 – ₹30,000 (one-time) SMEs and small corporates needing offline accounting solution, Advanced inventory, GST return module, multi-entity₹25,000 – ₹35,000Medium businesses and retail chainsZoho Books / QuickBooksCloud accounting, GST-compliant invoicing, mobile app, auto reconciliation, bank feeds₹1,500 – ₹4,000 per monthStartups / service firms preferring cloud subscription Clear (GST Suvidha)Cloud-based GST filing portal, automated GSTR-1/3B preparation, PIN-based EVC/E-Return filing₹1,000 – ₹2,000 per GSTIN per monthCA firms and businesses focused on automation and alertsSAP / Oracle / ERP Enterprise resource planning with GST compliance modules (Output/Input tax, reports)≥₹1,00,000 (enterprise license)Large enterprises with global operations AFS Acumen FinSuite In-house developed GST compliance dashboard integrating client data, reminders, e-filing, and audit trail (used by AFS consultants)Custom (integrated with AFS service package)AFS-managed clients requiring dedicated advisory and assured compliance GST Portal (govt. site)Government e-filing site (free), offline utilities for upload Free All taxpayers (basic filing), or as backup

Comparison and Suitability:

• TallyPrime/Busy are popular with Indian businesses for robust accounting + GST; suitable for clients who prefer desktop software.

• Cloud solutions (Zoho, ClearTax) offer automatic bank and TDS integrations, real-time collaboration, and scale with business. These also often include GST return checks. They have recurring subscription costs but lower upfront fees.

• AFS Proprietary System: As consultants, AFS can differentiate by using or developing a tailored compliance platform. For example, our AFS FinSuite (hypothetical) could pull clients’ sales/purchase data, auto-generate drafts of GSTR-1/3B, flag discrepancies, and queue returns for filing. While building such a system has higher initial cost, it enables AFS to deliver value-added services (like real-time dashboards and audit trails) that generic tools lack.

• GST Portal Tools: The official GSTN portal and its offline return tool are free and must be used for actual filing. However, they lack many features (no auto-reconciliation or error-checking). We recommend using them in conjunction with commercial software for preparation, not relying solely on manual entry.

Workflow Recommendation for AFS:

1. Data Collection: Clients submit sales and purchase invoices in a standard format (spreadsheet or via API).

2. Software Import: Data is ingested into the chosen GST software (or AFS platform) which maps to GSTR tables

3. Preliminary Reconciliation: The system matches GSTR-2B (for purchases) against ITC claimed, and GSTR-1 vs GSTR-3B for each period. Discrepancies are flagged.

4. Tax Calculation & Drilldown: Auto-calculate tax liability and interest. AFS reviews any unusual variances.

5. Review & Approval: AFS expert reviews drafts, queries client on issues (e.g. high-value mismatches). Once approved, returns are locked for filing.

6. Filing: Returns (GSTR-1,3B) are filed on GST portal (via EVC or DSC) before due dates. Proof of filing is archived.

7. Annual Process: At year-end, similar steps apply for GSTR-9: data aggregated, reconciled, and the annual return & GSTR-9C (if required) filed.

8. Post-Filing Audit: Keep track of any GST notices for the period; use the above checklist process to respond.

By combining reliable software with expert oversight (such as AFS’s team of qualified CAs), businesses can minimize human error and litigation risk.

Conclusion

GSTR-1, GSTR-3B, and GSTR-9 are the backbone of India’s GST compliance regime. Staying current with their rules – including due dates, threshold changes, and procedural amendments – is essential. As of 2025–26, the system has eased for small taxpayers (annual return exemption up to ₹2cr, higher audit limits), but vigilance is needed on data accuracy and timely filing. By following structured reconciliation, leveraging tools, and understanding the latest notifications, businesses can file with high confidence.

Acumen Financial Solutions (AFS) stands ready to assist clients across industries in implementing these practices. Our expertise (25+ years of CA experience) and proprietary workflows help prevent notices and ensure seamless GST compliance. We recommend that clients engage a professional firm like AFS for ongoing advice, regular checkups, and to handle any statutory notices that arise. With the right processes and tools, businesses can focus on growth while maintaining 100% GST compliance.

Sources: Official notifications, CBIC circulars, GSTN tutorials, ICAI and tax authority guidelines were used throughout. Key references include CBIC notifications (e.g. No. 15/2025, No. 30/2024), CBIC GST circulars, and expert commentary (ICAI, GST Council, etc.). All requirements are in line with the latest GST laws and government updates.

Acumen Financial Solutions Atul Anand Jha Ankit Goel (Chartered Accountant)

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