The compliance calendar every business with a GSTIN should have on the wall

The essential compliance calendar for any business with a GSTIN includes filing GSTR-1 by the (or for QRMP), GSTR-3B by the , , or , and the annual GSTR-9 by . Missing these deadlines attracts late fees starting at and halts your buyers' input tax credit claims.

Why is a strict GST compliance calendar critical for your business operations?#

Maintaining a strict GST compliance calendar is not just about avoiding penalties; it is a fundamental requirement for the smooth operation of any business holding a Goods and Services Tax Identification Number (GSTIN). When a business is registered under the GST regime, the government mandates a continuous, structured flow of information regarding sales, purchases, and tax liabilities.

Failing to adhere to this calendar triggers a domino effect of negative consequences. Primarily, if you delay filing your outward supply returns (GSTR-1), your B2B customers cannot claim their Input Tax Credit (ITC) in their GSTR-2B. This often leads to withheld payments, strained vendor relationships, and a loss of business reputation. Customers prefer vendors who are highly compliant because it directly impacts their own working capital.

Furthermore, the GST portal enforces strict sequential filing. You cannot file a GSTR-3B for a given month if the GSTR-1 for that same period has not been filed. If non-compliance persists for (or for QRMP taxpayers), the tax authorities have the power to initiate the cancellation of your GST registration. Operating a business with a suspended or cancelled GSTIN is illegal and brings all commercial activities to an abrupt halt.

Lastly, the financial implications of missed deadlines are severe. Late fees accumulate daily, and interest is levied on any delayed payment of tax at a rate of . Over time, these punitive charges can severely dent a company's profitability. A well-maintained compliance calendar is the only effective shield against these risks, ensuring that your accounting team, your tax consultants, and your management are all aligned on critical due dates. For end-to-end support, consider our GST Returns Filing Services.

What are the monthly filing deadlines for regular taxpayers?#

For a regular taxpayer—typically defined as a business with an annual aggregate turnover exceeding , or those who voluntarily opt out of the quarterly filing schemes—the GST compliance calendar revolves around a rigorous monthly cycle. The core of this cycle involves reporting outward supplies and discharging the net tax liability.

GSTR-1: The Outward Supplies Return#

The GSTR-1 is the foundational document of the monthly compliance cycle. It contains the details of all outward supplies (sales) made during the month. The statutory deadline for filing GSTR-1 is the . For example, the GSTR-1 for the month of April must be filed by the .

Accuracy in GSTR-1 is paramount. Every B2B invoice must be correctly uploaded with the recipient's valid GSTIN, the correct invoice number, date, and tax rate. Any error here directly impacts the recipient's ability to claim ITC. It is highly recommended to finalize your sales register by the to allow ample time for data validation before the deadline.

GSTR-2A and GSTR-2B: The ITC Reconciliations#

While these are not returns that you actively file, they are critical milestones in your monthly calendar. GSTR-2B is an auto-drafted ITC statement generated on the . It freezes the ITC available to you based on the GSTR-1, IFF, and GSTR-6 filed by your suppliers.

Before proceeding to file your tax liability, your accounts team must reconcile your purchase register with the GSTR-2B. Any ITC claimed in excess of what is reflected in GSTR-2B can invite notices from the GST department. The days between the and the of the month should be dedicated strictly to this reconciliation process. For deep insights on managing these reconciliations and avoiding mismatches, read our comprehensive guide on GSTR-9 and 9C Filing Reconciliations.

GSTR-3B: The Summary Return and Tax Payment#

The culmination of the monthly compliance cycle is the GSTR-3B. This return summarizes your total outward tax liability (from GSTR-1) and your eligible Input Tax Credit (from GSTR-2B), resulting in the net tax payable in cash. The deadline for filing GSTR-3B for regular monthly filers is the .

The tax payment must be made before or at the time of filing the GSTR-3B. Delayed payment attracts an interest rate of , calculated from the until the date of actual payment. It is a best practice to ensure that sufficient funds are available in your electronic cash ledger by the to avoid last-minute banking glitches.

How does the QRMP scheme change your compliance calendar?#

The Quarterly Return Filing and Monthly Payment of Taxes (QRMP) scheme was introduced to ease the compliance burden on small and medium enterprises (SMEs). If your aggregate annual turnover in the preceding financial year was up to , you are eligible to opt into this scheme. While the scheme reduces the frequency of full return filings, it introduces new monthly obligations that must be carefully tracked.

Invoice Furnishing Facility (IFF)#

Under the QRMP scheme, you are not required to file a full GSTR-1 every month. However, to ensure that your B2B customers do not suffer a delay in claiming their ITC, the government provides the Invoice Furnishing Facility (IFF).

For the first two months of a quarter, you have the option to upload your B2B invoices using the IFF. The deadline for the IFF is the . It is important to note that the IFF is optional and restricted to a maximum cumulative value of . If you miss the deadline, you cannot upload invoices for that month via IFF; they must be deferred to the subsequent month or the quarterly GSTR-1.

Monthly Tax Payments (PMT-06)#

Although the return is quarterly, tax payments under the QRMP scheme remain monthly. For the first two months of the quarter, you must deposit the estimated tax liability using form GST PMT-06 by the .

The government allows two methods for calculating this monthly payment:

1. Fixed Sum Method: You pay of the tax paid in cash in the preceding quarter, or of the tax paid in cash in the last month of the preceding quarter (depending on your previous filing frequency).
2. Self-Assessment Method: You calculate the actual tax liability for the month, net of available ITC, and pay that exact amount.

Quarterly GSTR-1 and GSTR-3B#

At the end of the quarter, the compliance requirements converge.

• The quarterly GSTR-1 must be filed by the following the end of the quarter. This return will include all B2C sales for the quarter and any B2B sales not already uploaded via the IFF.
• The quarterly GSTR-3B must be filed by the or of the month following the quarter, depending on the state in which your principal place of business is registered.

What are the essential compliance deadlines for e-invoicing and e-way bills?#

Beyond the standard returns, the GST regime relies heavily on real-time and transactional compliance mechanisms, specifically e-invoicing and e-way bills. These do not have monthly "deadlines" in the traditional sense, but they require immediate, transaction-level compliance that must be integrated into daily business operations.

E-Invoicing Thresholds and Real-time Generation#

E-invoicing is currently mandatory for businesses with an aggregate annual turnover exceeding in any financial year from 2017-18 onwards. Under this system, a standard B2B invoice generated by your ERP or accounting software is not legally valid until it is registered on the Invoice Registration Portal (IRP) and obtains an Invoice Reference Number (IRN) and a QR code.

The critical compliance aspect here is timing. An e-invoice must be generated in real-time or near real-time. Without a valid IRN, the invoice cannot be issued to the buyer, and the goods cannot be dispatched. The government has also imposed time limits on reporting old invoices to the IRP. For taxpayers with an Aggregate Annual Turnover (AATO) over , invoices must be reported to the IRP within of the invoice date.

E-way Bill Generation and Validity#

An e-way bill is required for the movement of goods where the consignment value exceeds (though this threshold varies by state for intra-state movement; for example, it is in some jurisdictions).

The compliance rule for e-way bills is strict: the bill must be generated before the commencement of the movement of goods. Furthermore, e-way bills have a limited validity period based on the distance to be traveled. For regular cargo, the validity is or part thereof. For Over Dimensional Cargo (ODC), it is . Tracking the expiry of e-way bills and extending them (within before or after expiry) in case of transit delays is a daily compliance task for businesses dealing in physical goods.

What are the annual GST compliance requirements?#

The GST calendar culminates in the annual compliance cycle, which serves as a final reconciliation and true-up of all transactions undertaken during the financial year. The annual returns are complex, demanding a comprehensive audit of your books of accounts against your filed GST returns.

GSTR-9: The Annual Return#

GSTR-9 is the annual return that consolidates all outward supplies, inward supplies, taxes paid, and ITC claimed during the financial year. The standard deadline for filing GSTR-9 is of the year succeeding the relevant financial year. For instance, the GSTR-9 for FY 2024-25 is due on .

Filing GSTR-9 is mandatory for taxpayers whose aggregate turnover exceeds . It is crucial to use this return to correct any remaining discrepancies from the monthly filings, though the window for claiming missed ITC or amending invoices usually closes earlier (typically by the following the end of the financial year).

GSTR-9C: The Reconciliation Statement#

For taxpayers with an aggregate turnover exceeding , the compliance burden is higher. Along with the GSTR-9, they must file Form GSTR-9C, which is a reconciliation statement between the audited annual financial statements and the figures reported in the GSTR-9.

Previously, GSTR-9C had to be certified by a Chartered Accountant or Cost Accountant. However, the law has been amended to allow for self-certification by the taxpayer. The deadline for GSTR-9C aligns with the GSTR-9 deadline, which is . Preparing GSTR-9C requires meticulous attention to detail, reconciling unbilled revenue, unadjusted advances, and variations in ITC. We assist businesses with complex Tax Audit and Reconciliations to ensure zero discrepancies.

What are the compliance deadlines for special categories of taxpayers?#

Not all businesses fall under the regular monthly or QRMP schemes. The GST law provides specific calendar requirements for special categories of registrations.

Composition Scheme Taxpayers#

Small businesses with a turnover up to (or in specific states) and service providers up to can opt for the Composition Scheme. Their compliance calendar is significantly simpler:

• CMP-08 (Tax Payment): They must pay a flat rate of tax quarterly using form GST CMP-08 by the following the end of the quarter.
• GSTR-4 (Annual Return): They are required to file an annual return in Form GSTR-4 by the following the end of the financial year.

TDS and TCS Deductors under GST#

Government departments, local authorities, and specified agencies are required to deduct Tax Deducted at Source (TDS) under GST at on payments made to suppliers where the contract value exceeds . They must file Form GSTR-7 by the . For more details on the implications of delayed TDS compliance across various tax laws, see our article on TDS Defaults, Interest, Late Fees, and Penalties.

Similarly, E-commerce operators are required to collect Tax Collected at Source (TCS) at on the net value of taxable supplies made through their platform. They must file Form GSTR-8 by the .

Non-Resident Taxpayers and OIDAR Services#

• Non-Resident Taxable Persons (NRTP): Must file Form GSTR-5 by the or within after the last day of the validity period of their registration, whichever is earlier.
• OIDAR Service Providers: Providers of Online Information Database Access and Retrieval (OIDAR) services located outside India providing services to unregistered persons in India must file Form GSTR-5A by the .

What happens if you miss GST filing deadlines?#

The cost of non-compliance under the GST regime is steep and designed to strongly discourage delays. The penalties compound quickly and can severely impact a business's cash flow.

Late Fees for GSTR-1 and GSTR-3B#

For delayed filing of GSTR-1 and GSTR-3B, the standard late fee is ( + ) for standard returns, and ( + ) for nil returns.

To provide some relief to smaller businesses, the maximum late fee is capped based on the aggregate turnover in the preceding financial year:

• Turnover up to : Maximum late fee capped at per return.
• Turnover between and : Maximum late fee capped at per return.
• Turnover above : Maximum late fee capped at per return.

Interest on Late Payment of Tax#

If you fail to pay your GST liability by the due date, an interest rate of is levied on the outstanding tax amount. This interest is calculated purely on a per-day basis from the day following the due date until the actual date of payment. Notably, this interest is calculated on the net cash tax liability (the tax payable after utilizing available ITC).

However, if you make an undue or excess claim of ITC, or an undue or excess reduction in output tax liability, the penal interest rate jumps to a steep .

Late Fees for Annual Returns (GSTR-9)#

The penalty for failing to file the annual return (GSTR-9) on time is significantly higher. The late fee is calculated at ( + ). This penalty continues to accumulate until the return is filed, subject to a maximum cap of in the respective State or Union Territory.

Suspension and Cancellation of Registration#

As mentioned earlier, the ultimate penalty for chronic non-compliance is the suspension of your GSTIN. If a regular taxpayer fails to file returns for , the GST system will automatically flag the profile for suspension. During the suspension period, the business cannot issue tax invoices, cannot collect GST, and will suffer severe operational paralysis until all pending returns are filed and taxes, late fees, and interest are paid in full.

At-a-Glance GST Compliance Calendar#

To help you visualize and implement these deadlines, here is a structured summary table that every accounts department should pin to their noticeboard.

| Taxpayer Category | Form / Return | Compliance Type | Statutory Due Date | | :--- | :--- | :--- | :--- | | Regular (> ₹5 Cr) | GSTR-1 | Outward Supplies | | | Regular (> ₹5 Cr) | GSTR-3B | Summary & Payment | | | QRMP (< ₹5 Cr) | IFF | B2B Invoice Upload | | | QRMP (< ₹5 Cr) | PMT-06 | Monthly Tax Payment | | | QRMP (< ₹5 Cr) | GSTR-1 | Quarterly Outward | | | QRMP (< ₹5 Cr) | GSTR-3B | Quarterly Summary | | | Composition | CMP-08 | Quarterly Payment | | | Composition | GSTR-4 | Annual Return | | | TDS Deductors | GSTR-7 | Monthly TDS Return | | | TCS Deductors | GSTR-8 | Monthly TCS Return | | | All Eligible | GSTR-9 | Annual Return | | | All Eligible | GSTR-9C | Recon Statement | |

How should you prepare your internal accounting calendar?#

Relying solely on the statutory deadlines is a recipe for stress and potential late filings. A robust organization creates an internal calendar that is significantly ahead of the government deadlines. This proactive approach ensures ample buffer time for review, reconciliation, and handling unexpected technical glitches on the GST portal.

1. Close Books by the 3rd: Mandate that all sales and purchase entries for the preceding month must be finalized in your ERP system by the .
2. Generate Sales Register by the 5th: The draft outward supply data (for GSTR-1 or IFF) should be extracted and reviewed by the internal audit or tax team by the .
3. File GSTR-1 early by the 9th: Aim to file GSTR-1 by the . The GST portal often experiences massive slowdowns on the and due to nationwide traffic.
4. Reconcile ITC by the 16th: Once GSTR-2B is generated on the , allocate exclusively for matching your purchase register with the 2B data. Resolve discrepancies with vendors immediately.
5. Fund the Cash Ledger by the 18th: Calculate the net tax payable and initiate the bank transfer to the GST Electronic Cash Ledger by the .
6. File GSTR-3B by the 19th: Complete the filing process one day before the deadline to ensure complete peace of mind.

By institutionalizing this internal schedule, businesses can transition from a reactive, crisis-driven compliance mode to a proactive, highly optimized tax management system. For professional guidance on setting up these internal workflows and taking over your monthly compliance burden, our team is equipped to assist you. Explore our comprehensive compliance solutions by visiting our GST and TDS Compliance Services page.

What to do next#

Navigating the complexities of the GST compliance calendar requires specialized knowledge, rigorous attention to detail, and a proactive approach. A single missed deadline or reconciliation error can result in severe financial penalties and disrupt your business operations. Don't leave your compliance to chance.

Our team of experienced tax professionals is ready to take the burden of GST compliance off your shoulders. We provide end-to-end management of your monthly, quarterly, and annual GST returns, ensuring 100% accuracy and timely filings. Secure your business's financial health and maintain excellent vendor relationships by partnering with us.

Explore our GST Returns Services and get started today.

FAQs#

What is the penalty for filing a Nil GSTR-3B late?#

If you have no business activity during a month, you must still file a Nil return. If you file a Nil GSTR-3B late, the late fee is ( + ), capped at a maximum limit depending on your turnover category.

Can I revise a filed GSTR-1 or GSTR-3B if I made a mistake?#

No, the GST portal does not currently allow you to revise a filed GSTR-1 or GSTR-3B. Any errors or omissions must be corrected in the returns of the subsequent months through amendments. For outward supplies, amendments can be made in the GSTR-1 of the following month.

What is the deadline to claim missed Input Tax Credit (ITC) for a financial year?#

The absolute deadline to claim any missed ITC pertaining to a specific financial year is the of the succeeding financial year, or the date of filing the annual return (GSTR-9), whichever is earlier. For example, for FY 2023-24, ITC must be claimed by .

What is the difference between GSTR-2A and GSTR-2B?#

GSTR-2A is a dynamic, live statement that updates continuously as suppliers file their returns or amendments. GSTR-2B is a static statement generated on the . For the purpose of claiming ITC in your GSTR-3B, you must strictly rely on the static GSTR-2B data.

Is the QRMP scheme mandatory for businesses with turnover under ₹5 Crores?#

No, the QRMP (Quarterly Return Filing and Monthly Payment of Taxes) scheme is entirely optional. Eligible businesses can choose to opt into the scheme for reduced return filing frequency, or they can remain under the regular monthly filing scheme if they prefer to maintain a monthly discipline.

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Last reviewed: August 9, 2026