PROCESS OF FILING FORM CMP-08

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PROCESS OF FILING FORM CMP-08

Form CMP-08 is the quarterly self-assessed tax statement that every taxpayer registered under the GST Composition Scheme must file and pay. It is not a conventional GST return — it is a challan-cum-statement that serves as both your tax declaration and your payment instrument. For FY 2026-27, composition taxpayers — manufacturers, traders, and eligible service providers with aggregate turnover up to ₹1.5 crore (₹75 lakh in special category states) — must file four CMP-08 statements and one annual GSTR-4. Miss the 18th-of-the-month deadline and you face interest at 18% per annum plus a late fee, and repeated defaults can cost you composition eligibility altogether.

Who Must File CMP-08

Every taxpayer who has opted into the composition levy is required to file CMP-08. Specifically, that means:

• Manufacturers and traders who opted in under Section 10(1) of the CGST Act, 2017, using Form CMP-02.
• Restaurants not serving alcohol covered under Section 10(1) read with the relevant notification.
• Service providers and mixed suppliers covered by the special composition scheme under Notification No. 02/2019-Central Tax (Rate), which carries a separate ₹50 lakh aggregate turnover ceiling.
• Taxpayers who selected the composition option at the time of fresh GST registration.

If your registration is under the composition scheme on even a single day of a quarter, you must file CMP-08 for that quarter. There is no exemption for zero-turnover quarters — you must file a nil CMP-08.

Who does NOT file CMP-08: Regular taxpayers, Input Service Distributors, non-resident taxable persons, and e-commerce operators who collect TCS are excluded from the composition scheme and therefore do not file this form.

CMP-08 Due Dates for FY 2026-27

The quarterly due date is the 18th of the month immediately following the close of the quarter. For FY 2026-27, the four deadlines are:

Mark these dates in your calendar with a five-day buffer — not because the portal is unreliable, but because payment failures (bank downtime, UPI limits) can cause you to miss the cut-off even if you start on time.

Annual GSTR-4 — which consolidates all four CMP-08 filings — is due by 30 June 2027 for FY 2026-27.

Tax Rates Under the Composition Scheme

The composition rate applies to your taxable turnover — the value of outward supplies excluding GST. The rate varies by the nature of your business:

Important distinction on service providers: If you are a mixed supplier — primarily a goods trader but incidentally provide services — the entire turnover is taxed at 1%, provided the service component does not exceed 10% of total turnover or ₹5 lakh (whichever is higher). If services exceed that threshold, the 6% rate applies to the entire turnover. Misclassifying this is one of the most expensive errors composition taxpayers make.

Reverse Charge Mechanism (RCM): Composition taxpayers must pay GST on inward supplies attracting reverse charge at the normal (non-composition) rate — typically 18% or 28% depending on the goods/service. This cannot be offset against composition tax payable, and it cannot be recovered as input tax credit (ITC) because composition taxpayers are not eligible to claim ITC.

Worked Example: Computing Tax Payable in CMP-08

Scenario: Rajan runs a general merchandise retail shop in Pune. He is registered under the composition scheme as a trader. His figures for Q1 FY 2026-27 (April–June 2026) are:

• Total collections from customers (GST-inclusive, since composition dealers do not collect GST from customers): ₹6,20,000
• Purchases attracting RCM (from unregistered advocates for legal consultation): ₹15,000 + 18% GST under RCM

Step 1 — Compute taxable turnover for composition tax: Rajan cannot charge GST separately. His total collections are his taxable value. Taxable turnover = ₹6,20,000.

Step 2 — Compute composition tax: ₹6,20,000 × 1% = ₹6,200 Split: CGST = ₹3,100 | SGST = ₹3,100

Step 3 — Compute RCM liability (reported separately in CMP-08 Table 3): Legal service purchase = ₹15,000 × 18% = ₹2,700 Split: CGST = ₹1,350 | SGST = ₹1,350

Step 4 — Total payment in CMP-08: Composition tax: ₹6,200 + RCM liability: ₹2,700 = Total outflow: ₹8,900

Step 5 — What Rajan cannot do: He cannot adjust the ₹2,700 RCM outgo against composition tax. He cannot claim ITC on any purchase — not on his stock, not on the ₹2,700 RCM paid. Both amounts must be paid in cash.

If Rajan misses the 18 July 2026 deadline and files on 5 August 2026 (18 days late):

• Interest: ₹8,900 × 18% × 18/365 = ₹79 in interest
• Late fee under Section 47: ₹200 per day (₹100 CGST + ₹100 SGST) × 18 days = ₹3,600 in late fee (subject to any cap notified by CBIC)

The late fee dwarfs the interest — this is why timely filing matters far more than timely payment alone.

Step-by-Step Process to File CMP-08 on the GST Portal

Follow these steps exactly as they appear on www.gst.gov.in (GST portal — not GSTN sandbox or any third-party software portal, which may have different navigation).

Step 1: Log In

• Open www.gst.gov.in in a browser (Chrome or Edge recommended).
• Click Login, enter your GSTIN and password, and complete the CAPTCHA.
• If your GSTIN is locked due to a previous default, resolve that first.

Step 2: Navigate to CMP-08

• From the dashboard, go to: Services → Returns → Statement-cum-Challan (Form GST CMP-08)
• Alternatively, under Returns Dashboard, select the relevant Financial Year (2026-27) and Return Filing Period (quarter) from the dropdown. The system will present the CMP-08 tile for composition taxpayers.

Step 3: Select the Quarter

• The portal defaults to the earliest unfiled quarter. Confirm the quarter — for example, "Q1 (April 2026 – June 2026)".
• If you have missed earlier quarters, file them in chronological order; the portal may block later quarters until earlier ones are filed.

Step 4: Fill Table 3 — Tax Payable

Table 3 is the only data-entry table in CMP-08. It has three rows:

• Row A — Outward supplies (sales/turnover): Enter the taxable value of all outward supplies made during the quarter. Do not include any tax amount here, and do not include exempt or nil-rated supplies that were already excluded when you opted into composition.
• Row B — Inward supplies attracting reverse charge: Enter the taxable value of all RCM-liable purchases (purchases from unregistered persons where RCM applies, import of services, etc.).
• Row C — Tax payable: The portal auto-computes tax on Row A at your applicable composition rate and on Row B at the standard RCM rate. You can verify these before proceeding; if the auto-computation appears wrong, recheck whether your registered category (trader/manufacturer/restaurant/service provider) matches your actual business activity.

Step 5: Save and Preview

• Click Save. A draft is stored.
• Click Preview Draft to download a PDF of the form with all entries. Review the CGST, SGST/UTGST, IGST, and Cess columns carefully before payment.

Step 6: Generate Challan and Pay

• Click Make Payment / Post Credit to Ledger.
• The portal generates a pre-filled challan (PMT-06) with the computed tax amount.
• Choose your payment mode: Net Banking, NEFT/RTGS, IMPS, UPI (via QR code), or Debit/Credit Card.
• For NEFT/RTGS, the portal provides a Mandate Form; use the IFSC and account details printed there. Payment must clear within the validity window of the challan (usually 15 days from generation).
• Once payment is confirmed, your Electronic Cash Ledger on the portal gets credited.

Step 7: File the Return

• After the tax is credited to your ledger, the form status changes to "Ready to File".
• For companies and LLPs: File using a valid Digital Signature Certificate (DSC) — Class 3 DSC is required.
• For proprietorships and partnerships: File using EVC (Electronic Verification Code) — an OTP sent to your Aadhaar-linked mobile number.
• Click File, select the verification method, enter the OTP or DSC, and submit.

Step 8: Download Acknowledgement

• Once filed, the form status changes to "Filed".
• Download the filed CMP-08 PDF and the payment receipt from the portal.
• Store both in your compliance folder — you will need these when preparing GSTR-4 in June 2027.

Nil Filing: What to Do When Turnover Is Zero

If you had zero outward supplies and zero RCM liability during a quarter, you must still file a nil CMP-08. Follow the same navigation path, enter ₹0 in Table 3, generate a ₹0 challan (no payment needed), and file using EVC or DSC. The portal will accept it. Skipping a nil filing generates a late fee exactly as if you had taxable turnover.

Common Mistakes and How to Avoid Them

Mistake 1: Reporting GST-Inclusive Value as Taxable Turnover

Composition dealers do not charge GST separately on their invoices — they absorb the composition tax. As a result, the amount shown on your invoice or received from the customer is already the taxable value. Do not gross it up or reduce it — enter the collection amount directly in Row A.

Compare this with a regular taxpayer who charges "₹100 + ₹18 GST = ₹118." A composition dealer simply charges ₹118 (or ₹100 depending on their pricing), and that entire amount is the taxable turnover for CMP-08 purposes.

Mistake 2: Ignoring RCM Liability

Many small traders assume that because they pay composition tax, there is nothing else to worry about. This is incorrect. If you purchase from an unregistered supplier where RCM applies (e.g., goods covered under the reverse charge schedule in Notification 13/2017-CT), or receive services like freight, legal consultancy, or security services from unregistered persons, you owe RCM at the standard rate. Undeclaring RCM invites scrutiny during GSTR-4 reconciliation and departmental audits.

Mistake 3: Adjusting ITC Against CMP-08 Tax

No ITC is available to composition taxpayers. If you transitioned from a regular taxpayer to composition and carried forward an ITC balance in your Electronic Credit Ledger, that credit is not usable to offset CMP-08 liability. You must pay in cash and ideally reverse the ITC in your records before opting into composition.

Mistake 4: Missing Quarters and Filing Out of Order

If you miss Q1 and try to file Q2 directly, the portal may block Q2 until Q1 is filed. Filing out of order creates a compounding late-fee problem. If you discover a lapse mid-year, file the oldest outstanding quarter first.

Mistake 5: Confusing CMP-08 with GSTR-4

CMP-08 is the quarterly tax statement — you pay here. GSTR-4 is the annual return — you reconcile here. Both are mandatory. Filing CMP-08 for all four quarters does not exempt you from GSTR-4. The late fee for GSTR-4 is currently ₹50 per day (₹25 CGST + ₹25 SGST) up to a maximum of ₹2,000, subject to any notifications modifying this cap.

Mistake 6: Using Wrong GSTIN or Quarter

If you have multiple GSTINs (one per state), file CMP-08 separately for each GSTIN. A composition taxpayer registered in Maharashtra and Karnataka files two separate CMP-08 statements per quarter. Using the wrong GSTIN to declare turnover earned in a different state is a serious mismatch that surfaces during GSTR-4 and departmental reconciliation.

Late Filing: Penalties and What They Actually Cost You

Under Section 47 of the CGST Act, the late fee for CMP-08 is ₹200 per day (₹100 CGST + ₹100 SGST), subject to caps announced by CBIC from time to time. Interest under Section 50 runs at 18% per annum on the unpaid tax from the day after the due date.

Worked penalty example: A restaurant operator with ₹12,00,000 quarterly turnover misses the Q2 deadline (18 October 2026) and files on 7 December 2026 — that is 50 days late.

• Composition tax payable: ₹12,00,000 × 5% = ₹60,000
• Interest: ₹60,000 × 18% × 50/365 = ₹1,479
• Late fee: ₹200/day × 50 days = ₹10,000 (subject to applicable cap)
• Total excess cost: ₹11,479 — nearly 19% of the tax itself

More critically, repeated late filings can trigger a notice from the jurisdictional GST officer and, under Section 10(5) of the CGST Act, result in cancellation of your composition eligibility. You would then be required to register as a regular taxpayer, file GSTR-1 and GSTR-3B monthly or quarterly, and start maintaining tax invoice-level records — a significant compliance burden.

Relationship Between CMP-08 and GSTR-4

Understanding how these two forms interact prevents confusion and double-counting:

• CMP-08 (quarterly): You declare turnover and pay tax. This is a self-assessed statement — no department review before you file.
• GSTR-4 (annual): Due by 30 June 2027 for FY 2026-27. GSTR-4 auto-populates the aggregate of your four CMP-08 filings in Table 5. You additionally need to declare inward supplies (purchases from registered taxpayers) in Table 4, which is partially pre-filled from your suppliers' GSTR-1 data.

Any difference between what you declared in CMP-08 and what your suppliers declared in GSTR-1 will surface in GSTR-4. Reconcile your purchase register against Form GSTR-2B monthly so there are no surprises in June.

If you discover you under-declared turnover in a previous CMP-08, the correction mechanism is to declare the shortfall in the next available CMP-08 and pay interest. There is no amendment form for CMP-08 itself; GSTR-4 is the only place where cumulative corrections can be made at the annual level.

Record-Keeping That Makes CMP-08 a Five-Minute Task

The portal does not pre-fill your sales data — unlike GSTR-3B for regular taxpayers, there is no auto-populated table pulling from GSTR-1. You must enter your taxable turnover manually. That means your own records must be reliable.

Maintain these on a running basis:

1. Monthly sales register: Date, customer name or "retail," taxable value, and mode of payment.
2. RCM register: Every purchase from an unregistered person where RCM applies — vendor name, nature of supply, taxable value, and RCM tax computed.
3. Bank reconciliation: Ensure all cash and digital collections are captured. The GST department cross-checks declared turnover against Form 26AS/AIS (income tax) data and bank statement patterns during scrutiny.

If you maintain these three records monthly, you can compile your CMP-08 in under ten minutes at quarter end. If you skip monthly maintenance and scramble in July, you risk arithmetic errors that create GSTR-4 mismatches.

Key Takeaways

• File CMP-08 quarterly — Q1 FY 2026-27 is due by 18 July 2026; Q4 by 18 April 2027. Nil quarters still require filing.
• Tax rates are 1% (traders/manufacturers), 5% (restaurants), or 6% (service providers) on taxable turnover — not on the GST-inclusive collection amount.
• RCM liability must be paid separately at the standard rate and cannot be set off against composition tax; no ITC is ever available to composition taxpayers.
• Late filing is expensive in late fees (₹200/day), not just interest (18% p.a.) — on a ₹60,000 tax liability, 50 days of delay costs over ₹11,000 extra.
• CMP-08 and GSTR-4 are both mandatory — quarterly filing of CMP-08 does not replace the annual GSTR-4 due by 30 June 2027.
• Correction after under-declaration must be handled in the next CMP-08 filing with interest; there is no standalone amendment form.
• Keep a monthly sales and RCM register so that each quarterly filing is a straightforward ten-minute data entry, not a forensic reconstruction of three months of transactions.