---
title: "Small Businesses GST Compliance Checklist & Guide"
description: "Follow a practical GST compliance checklist covering registration, invoices, ITC, returns, e-invoices, e-way bills and annual GST checks."
canonical: "https://busy.in/gst/gst-compliance-checklist-for-small-businesses/"
author: "Nitin Bansal"
published: "2026-08-12T08:30:00.000Z"
category: "GST"
---

-   Review GST registration, composition and Quarterly Return Filing and Monthly Payment of Taxes (QRMP) Scheme eligibility whenever turnover or business activities change.
-   Keep GSTIN, HSN or SAC, tax rate, and party master information accurate before raising invoices.
-   Reconcile sales, purchases, e-invoices, e-way bills, the Invoice Management System (IMS) and GSTR-2B before filing returns.
-   Use GSTR-1A for eligible outward-supply corrections identified after GSTR-1 but before GSTR-3B.
-   Resolve old return backlogs before the three-year filing restriction applies.

# GST Compliance Checklist for Small Businesses

GST compliance connects registration, invoices, Input Tax Credit, tax payments, returns and accounting records. An error in one record can affect several filings, so each stage should be checked before moving to the next.

This GST compliance checklist is intended for business owners, accountants and finance teams managing GST compliance for a small business. It covers regular, QRMP and composition taxpayers, but transaction-specific exceptions should still be reviewed with a qualified tax professional.

## GST Compliance Calendar at a Glance

| Compliance task | Monthly filer | QRMP taxpayer | Composition taxpayer |
| --- | --- | --- | --- |
| Outward-supply reporting | GSTR-1, normally by the 11th | Optional Invoice Furnishing Facility (IFF) for months 1 and 2, normally by the 13th; quarterly GSTR-1 by the 13th after the quarter | Not filed in the same form |
| Summary return | GSTR-3B, normally by the 20th | [**Quarterly GSTR-3B**](https://busy.in/gst/a-guide-to-gstr-3b-what-is-gstr-3b/), normally by the 22nd or 24th | Not applicable |
| Tax payment | With GSTR-3B | PMT-06 for months 1 and 2, normally by the 25th; balance with quarterly GSTR-3B | CMP-08, normally by the 18th after the quarter |
| [**ITC review**](https://busy.in/gst/input-tax-credit/) | Before filing GSTR-3B | Throughout the quarter and before quarterly filing | Regular ITC is not available |
| Annual filing | GSTR-9 and GSTR-9C where applicable | GSTR-9 and GSTR-9C where applicable | GSTR-4, normally by 30 June |

Due dates may be extended for a particular tax period or class of taxpayers. Confirm the applicable date on the GST Portal before filing.

## **1\. Confirm Registration and Scheme Eligibility**

### **Check whether GST registration is required**

GST registration depends on aggregate turnover, the nature of supplies and the states or Union Territories in which the business operates.

| Nature of supply | General threshold |
| --- | --- |
| Exclusive supply of goods | ₹40 lakh in jurisdictions that adopted the higher threshold |
| Goods in specified jurisdictions | ₹20 lakh |
| Services or mixed supplies | ₹20 lakh |
| Services or mixed supplies in Manipur, Mizoram, Nagaland and Tripura | ₹10 lakh |

Aggregate turnover is calculated on a PAN basis across India. A business cannot apply the threshold separately to each branch or [**GSTIN**](https://busy.in/gst/gstin-everything-you-need-to-know/) . Compulsory-registration provisions and specific exemptions may also change the result.

### **Consider simplified registration under Rule 14A**

An applicant who self-assesses that the total output tax liability on supplies to registered persons will not exceed ₹2.5 lakh per month may opt for simplified registration under [Rule 14A.](https://cenexcisekochi.gov.in/registration-advisory-for-simplified-gst-registration-scheme/) This limit includes CGST, SGST or UTGST, IGST and compensation cess. The applicant must select the relevant option in Form GST REG-01 and complete the prescribed Aadhaar authentication.

Subject to successful Aadhaar authentication, registration is granted electronically within three working days from the generation of the Application Reference Number.

### **Choose the appropriate GST scheme**

| Scheme | Broad eligibility | Main compliance effect |
| --- | --- | --- |
| Regular scheme | Registered taxpayers not using composition | Charge GST, claim eligible ITC and file GSTR-1 and GSTR-3B |
| [**Composition scheme**](https://busy.in/gst/complete-guide-to-gst-composition-scheme/) | Generally up to ₹1.5 crore, or ₹75 lakh in specified states | Pay tax at the prescribed rate, issue a bill of supply and do not claim regular ITC |
| Small service-provider scheme | Eligible taxpayers with preceding-year aggregate turnover up to ₹50 lakh who are not eligible under Section 10(1) | Pay tax at 6% under [**Notification No. 2/2019-Central Tax**](https://gstcouncil.gov.in/node/4503) (Rate), subject to its conditions |
| QRMP | Eligible regular taxpayers with PAN-based aggregate annual turnover up to ₹5 crore | File [**GSTR-1 and GSTR-3B**](https://busy.in/gst/comparison-of-gstr-3b-vs-gstr-1-importance-report/) quarterly while paying tax monthly |

Filing frequency should not be the only consideration. Customer ITC requirements, inter-state supplies, e-commerce transactions, expected turnover and cash flow can make one scheme more suitable than another.

Composition taxpayers may sell goods through an e-commerce operator, provided the supplies are made within the state and the prescribed conditions are met. Inter-state supplies through the operator are not permitted.

### **Complete post-registration requirements**

Display the registration certificate at the principal and additional places of business and show the GSTIN on the name board. Ensure that all operating locations, authorised signatories, contact details, bank accounts and management information are updated where required.

An eligible exporter or SEZ supplier should furnish a Letter of Undertaking before making zero-rated supplies without payment of IGST. The LUT remains valid for the financial year in which it is furnished. There is no universal 31 March deadline. Although delayed filing may be accepted retrospectively in some cases, businesses should furnish the LUT before making such supplies rather than rely on post-facto approval.

## **2\. Control Invoice and Transaction Data**

### **Maintain accurate accounting masters**

Accurate returns begin with accurate master data. Before invoicing, verify customer and supplier GSTINs, state codes, [**place of supply**](https://busy.in/gst/concept-of-place-of-supply-under-gst-explained-rules/) , HSN or SAC, GST rates, units, taxability, cess and reverse-charge treatment.

E-invoice and e-way bill applicability should also be mapped correctly. Do not select a tax rate only from an [**HSN or SAC number**](https://busy.in/gst/advisory-regarding-revamped-hsn-code-functionality/) . Consider the complete tariff entry, relevant notification and any value, use or recipient conditions.

### **Apply current HSN reporting rules**

For GSTR-1 Table 12, taxpayers with aggregate annual turnover (AATO) up to ₹5 crore generally report four-digit HSN codes, while taxpayers above ₹5 crore report six-digit codes.

From the May 2025 return period, HSN codes must be selected from the portal dropdown. Business-to-business (B2B) and business-to-consumer (B2C) supplies are reported through separate tabs. Table 13, which captures details of documents issued, is mandatory where outward supplies are reported.

Review the item master whenever a product, classification or tax rate changes. A correct HSN code linked to an outdated rate can still produce an incorrect invoice.

### **Check tax invoice particulars**

A tax invoice should contain the particulars required under [Rule 46,](https://taxinformation.cbic.gov.in/content/html/tax_repository/gst/rules/cgst_rules/active/chapter6/rule46_v1.00.html) including the supplier’s name, address and GSTIN, a [**unique consecutive number**](https://busy.in/gst/essential-information-to-be-included-in-gst-invoice/) , invoice date, recipient details, HSN or SAC, description, quantity, taxable value, GST rate and tax amount.

Place of supply, reverse-charge indication and signature or digital signature should also be included where applicable.

Different invoice series may be used for branches or transaction types, but each series must remain unique and traceable. Cancelled invoice numbers should be retained with the reason for cancellation and must not be reused.

### **Check e-invoice applicability**

[**E-invoicing generally applies**](https://busy.in/gst/e-invoicing-turnover-limit-vs-gst-threshold-whats-the-difference-and-why-it-matters/) where aggregate annual turnover under the PAN exceeded ₹5 crore in any financial year from 2017-18 onwards, subject to notified exemptions.

For a covered document, report the invoice, credit note or debit note to an authorised Invoice Registration Portal (IRP) and obtain the [**Invoice Reference Number**](https://busy.in/gst/all-about-invoice-reference-number-irn/) (IRN) and signed QR code. Confirm that the portal data matches the accounting entry and retain the acknowledgement with the document.

An IRN can normally be cancelled through the portal only within 24 hours. The e-invoice requirement continues to apply even if current turnover falls below ₹5 crore after the threshold was crossed in an earlier relevant year.

### **Apply the 30-day IRP reporting restriction**

From 1 April 2025, taxpayers with AATO of ₹10 crore or more cannot report covered invoices, credit notes or debit notes to the IRP after 30 days from the document date.

A daily exception report can identify documents that have been created but have not received an IRN. Waiting until GSTR-1 preparation may leave insufficient time to correct them.

### **Check e-way bill requirements before movement**

An [**e-way bill**](https://busy.in/gst/e-way-bills-the-complete-guide/) is generally required before goods move where the consignment value exceeds ₹50,000. Exemptions, mandatory cases and intrastate thresholds may differ.

Before dispatch, compare the invoice or delivery challan with the recipient GSTIN, place of supply, consignment value, HSN, quantity, transporter details and vehicle number. Where e-invoicing applies, the e-way bill data should also agree with the IRN-linked invoice.

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## **3\. Follow This Monthly GST Filing Checklist**

### **Step 1: Close the sales register**

Before [**preparing GSTR-1**](https://busy.in/gst/a-guide-to-gstr-1/) , confirm that all sales invoices have been recorded and that missing or cancelled numbers are explained.

Review credit notes, debit notes, advances and adjustments. Classify taxable, exempt, nil-rated and non-GST supplies correctly and verify whether CGST and SGST or IGST has been applied based on the place of supply.

The sales register should then be matched with e-invoices and e-way bills. Investigate any document that appears in one system but not another.

### **Step 2: Prepare GSTR-1 or IFF**

QRMP taxpayers may use the Invoice Furnishing Facility (IFF) during the first two months of the quarter when B2B invoices need to become visible to recipients earlier. Before filing, review document totals, HSN reporting, Table 13, and portal warnings. Correcting errors before submission is more reliable than depending on a later amendment.

### **Step 3: Use GSTR-1A for same-period corrections**

GSTR-1A is an [**optional facility**](https://busy.in/gst/amendments-of-details-in-gstr-1-and-error-messages/) available after GSTR-1 has been filed and before GSTR-3B is filed for the same tax period. It can normally be filed once for that period.

Before GSTR-1A was introduced for the August 2024 return period, eligible errors generally had to be corrected through a later GSTR-1 amendment. GSTR-1A now allows eligible additions and amendments before the corresponding GSTR-3B is filed, with the corrected values flowing into GSTR-3B.

A filed GSTR-3B cannot be revised. Where an error originates in outward-supply reporting, correcting the source through GSTR-1A is generally more appropriate than changing only the GSTR-3B value.

### **Step 4: Review IMS**

The Invoice Management System (IMS) was introduced from the October 2024 tax period. Before this, recipients primarily reviewed supplier-reported ITC through GSTR-2B. [**IMS added document**](https://busy.in/gst/how-the-new-invoice-management-system-under-gst-simplifies-tax-compliance-for-taxpayers/) \-level options to accept, reject, or keep eligible records pending on the GST Portal.

| IMS status | Effect on GSTR-2B |
| --- | --- |
| No action | Deemed accepted |
| Accepted | Included |
| Rejected | Excluded |
| Pending | Excluded for that period and retained for later action, subject to the legal time limit |

No action is not treated as rejection. However, unfamiliar invoices, duplicate records, incorrect values, and disputed credit notes should still be investigated before GSTR-3B is filed.

### **Step 5: Reconcile GSTR-2B with the purchase register**

The reconciliation should compare the supplier GSTIN, invoice number, date, taxable value, tax amounts, document type, and credit-note or debit-note references.

It should also confirm that the goods or services were received, the place of supply is correct, the [**credit is not blocked**](https://busy.in/gst/what-is-blocked-credit-in-gst-a-guide-to-section-175/) , and any required reversal has been identified. Payment status should be monitored for the 180-day rule.

**Practical example:** An invoice for ₹1,18,000 appears in IMS but is absent from the books. Verify the purchase order, goods-receipt record, supplier GSTIN and tax value. A genuine purchase should be booked and checked before ITC is claimed. A disputed or unrelated invoice should be rejected or kept pending, depending on the facts.

### **Step 6: Complete ITC checks**

Appearance in IMS or GSTR-2B does not automatically make a credit eligible. The business must hold the prescribed document, receive the goods or services and satisfy the conditions under [Sections 16](https://taxinformation.cbic.gov.in/content/html/tax_repository/gst/acts/2017_CGST_act/active/chapter5/section16_v1.00.html) and [17](https://taxinformation.cbic.gov.in/content/html/tax_repository/gst/acts/2017_CGST_act/active/chapter5/section17_v1.00.html) .

[**Blocked credits and reversals**](https://busy.in/gst/reversal-of-input-tax-credit/) under Rules 37, 37A, 42 and 43 should be identified before filing. Temporary reversals that may later be reclaimed should be recorded separately from permanently ineligible credit.

ITC relating to an invoice or debit note is generally subject to the earlier of 30 November following the financial year or the date on which the relevant annual return is filed.

### **Step 7: Prepare and file GSTR-3B**

Compare outward liability with GSTR-1 and GSTR-1A, and match ITC with the approved purchase reconciliation. Record [**reverse-charge liability**](https://busy.in/gst/all-about-reverse-charge-mechanism-rcm-under-gst/) , review reversals and reclaims, and confirm the electronic cash, credit and liability ledger balances.

Check interest and late fees before submission. From the January 2026 tax period, the GST Portal’s interest calculation considers the minimum electronic cash ledger balance while determining interest on delayed tax payment. System-computed interest in Table 5.1 cannot be reduced by editing it downward. After filing, retain the return, challans, acknowledgements and supporting reconciliation reports.

## **4\. Additional Checks for QRMP and Composition Taxpayers**

### **QRMP taxpayers**

Review QRMP eligibility at the beginning of each quarter and continue reconciling outward supplies and ITC during months when no quarterly return is due. The scheme reduces return frequency but does not remove monthly tax payment or record review responsibilities. If eligibility is lost, move to monthly filing from the applicable quarter.

The scheme reduces return frequency but does not remove monthly tax payment or record-review responsibilities. If eligibility is lost, the taxpayer must move to monthly filing from the applicable quarter.

### **Composition taxpayers**

Monitor turnover, inter-state supplies, e-commerce transactions and other restricted activities throughout the year. If the eligibility conditions are no longer met, withdraw from the scheme and move to regular compliance from the applicable date. The CMP-08 and GSTR-4 due dates are listed in the compliance calendar above.

## **5\. Complete the Annual GST Review**

### **Reconcile the financial year**

The annual review should compare turnover in the financial statements with the sales register, GSTR-1 and GSTR-3B. ITC in GSTR-3B should be matched with the [**purchase register and GSTR-2B**](https://busy.in/gst/what-is-gstr-2b-and-why-is-it-important/) .

Also review electronic ledgers, e-invoices, e-way bills, credit notes, debit notes, reverse-charge transactions, exempt supplies, zero-rated supplies, HSN summaries and branch-level records.

Annual-return disclosure does not automatically correct an error in a periodic return. Use the legally available amendment, payment or disclosure route for the type of error involved.

### **Check GSTR-9 and GSTR-9C applicability**

From FY 2024-25 onwards, registered persons with aggregate turnover up to ₹2 crore are exempt from filing GSTR-9 under [Notification No. 15/2025-Central Tax,](https://jkcomtax.gov.in/pdf/15-17-09-2025CT.pdf) subject to the notification. A self-certified GSTR-9C is generally required where aggregate turnover exceeds ₹5 crore and is filed with GSTR-9 by the applicable annual due date.

Even where GSTR-9 is not required, complete an internal annual reconciliation. The exemption does not remove bookkeeping, tax-payment, ITC or record-retention requirements.

### **Clear old return backlogs**

Specified returns and statements under Sections 37, 39, 44 and 52 cannot generally be furnished more than three years after their original due date. The Government may permit specified exceptions through notification.

An old return is therefore not only a late-fee issue. If it remains unresolved, filing may eventually become time-barred.

### **Retain GST records**

GST accounts and records must generally be retained for 72 months from the due date for filing the annual return for the relevant financial year.

Keep them for longer where an appeal, revision, investigation or other proceeding remains pending.

## GST Late Fees and Interest

| Default | Normal treatment |
| --- | --- |
| Late non-nil GSTR-1 or GSTR-3B | ₹50 per day in total |
| Late nil GSTR-1 or GSTR-3B | ₹20 per day in total |
| Maximum late fee for a nil return | ₹500 in total |
| Maximum for a non-nil return where turnover is up to ₹1.5 crore | ₹2,000 in total |
| Maximum for a non-nil return where turnover exceeds ₹1.5 crore but is up to ₹5 crore | ₹5,000 in total |
| Maximum for a non-nil return where turnover exceeds ₹5 crore | ₹10,000 in total |
| Delayed tax payment | Normally 18% interest per annum |
| ITC wrongly availed and utilised | 24% interest per annum |

Period-specific extensions, waivers and amnesty notifications may change the amount for a particular tax period. Confirm the relevant notification before calculating an old liability.

## **Bring GST Workflows Into One System**

BUSY [accounting software](https://busy.in/accounting-software/) connects GST invoicing, accounting, inventory, e-invoice and e-way bill generation, GST return-related reports and GSTR reconciliation. This reduces repeated data entry and makes it easier to trace figures from invoices to returns.

More than 6,00,000 businesses use BUSY. Software can make the GST checklist easier to manage, but the business and its adviser should still review classification, ITC eligibility, exceptions and the final return.

## **Conclusion**

A useful GST compliance checklist should follow the same sequence as the underlying records: register correctly, create accurate invoices, reconcile outward and inward supplies, file the correct returns and retain supporting evidence.

The strongest control is a documented monthly close in which the sales register, purchase register, IMS, GSTR-2B, e-invoices, e-way bills and GSTR-3B agree before filing. This makes errors easier to correct and differences easier to explain during scrutiny or annual reconciliation.

## About the author

**Nitin Bansal**

I am a Fellow Chartered Accountant (FCA) and LLB graduate with 10 years of experience in corporate auditing, taxation, and financial consulting. My expertise includes corporate audits, income tax planning, HSN code classification, and GST rate advisory. Through my blogs and articles, I aim to simplify corporate taxation, auditing, and GST compliance, making financial matters more accessible for professionals and business owners.

## Frequently asked questions

### Can a business register voluntarily below the GST threshold?

Yes. A person who is not otherwise required to register may apply for voluntary GST registration. Once registered, the person generally has the same compliance responsibilities as another registered taxpayer.

### What should a buyer do when a genuine invoice is missing from GSTR-2B?

Verify the invoice number, supplier GSTIN and tax details. If the purchase is genuine, ask the supplier to report or correct the document through the appropriate return so that it is communicated through the prescribed statement. Do not claim ITC solely on the basis of the purchase invoice.

### Can invoice numbers restart at the beginning of a financial year?

Yes. Invoice serial numbers are maintained for a financial year, so a business may begin a new series in the next financial year. The method should remain consistent, and each invoice must remain uniquely identifiable.

### Can the recipient GSTIN be corrected through GSTR-1A?

No. The recipient GSTIN cannot be amended through GSTR-1A. The correction generally has to be reported through the applicable amendment process in a later GSTR-1, subject to the legal time limit and portal rules.

### Can one GSTIN cover branches in different states?

No. GST registration is state-specific. A separate registration is generally required in each state or Union Territory from which the business makes taxable supplies and becomes liable to register. Branches within the same state may usually be added as additional places of business.

### Does an online-only service business follow different registration rules?

The normal service-supplier threshold and relevant compulsory-registration or exemption provisions apply. The absence of a shop, warehouse or customer-facing office does not by itself remove GST obligations.

### Can GST records be maintained completely in electronic form?

Yes. Electronic records are permitted if they are authenticated, backed up and producible in a readable form. The accounting system should preserve a traceable record of corrections and deleted entries.

### Can ITC reversed under the 180-day payment rule be reclaimed?

Yes. Credit reversed under Rule 37 may generally be reclaimed after the supplier is paid and the prescribed conditions are satisfied.

### Is an LUT required when exports are made on payment of IGST?

No. An LUT is used for eligible zero-rated supplies made without payment of IGST. It is not required for exports made through the permitted tax-payment route.

### Can ITC be claimed when goods are received in lots or instalments?

ITC may be claimed after the final lot or instalment is received, subject to the other eligibility conditions under Section 16.

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