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Reply Required Within 7 Working Days
Missing this deadline means your GST registration will be cancelled — respond via REG-18 immediately.
Show Cause Notice Under Section 29 of CGST Act, 2017
Got your REG-17 notice?
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REG-17 is probably the scariest notice you can get under GST — because it's not about paying some tax or penalty. It's about losing your GST registration entirely. The officer is telling you: "I have reasons to cancel your GSTIN, and here's your chance to explain why I shouldn't."
This notice is issued under Section 29 of the CGST Act. It's a show cause notice — meaning the cancellation hasn't happened yet. You still have a window to respond and save your registration. But that window is very small: just 7 working days.
Once your GSTIN is cancelled, the consequences cascade: you can't issue tax invoices, your buyers lose ITC on your supplies, you lose your Input Tax Credit, you must file a final return (GSTR-10), and if you want to do GST-taxable business again, you'll need a fresh registration. Getting revocation is possible but much harder than simply responding to REG-17 on time.
Non-filing of returns for 6+ consecutive months
This is the most common trigger. If you haven't filed GSTR-3B for 6 consecutive tax periods (months), the system automatically flags your GSTIN for cancellation. For composition dealers, the threshold is 3 consecutive quarters.
Non-commencement of business within 6 months
If you obtained GST registration but didn't start business operations within 6 months of the date of registration, the officer can initiate cancellation. This catches people who registered speculatively or to claim ITC on setup expenses but never actually started trading.
Registration obtained by fraud or misrepresentation
If the department discovers that your registration was obtained using false documents, fake addresses, or misrepresented facts, they'll issue REG-17. This is a serious ground — it can also attract penalties under Section 122.
Violation of GST provisions
Specific violations like issuing invoices without supplying goods (bill trading), availing ITC without receiving goods or services, or significant mismatches between GSTR-1 and GSTR-3B that suggest tax evasion.
Composition dealer exceeding turnover limit
Composition scheme taxpayers who cross the ₹1.5 crore turnover limit (₹75 lakh for special category states) without migrating to regular scheme may get REG-17 for eligibility violation.
Principal place of business not found at registered address
During physical verification, if the officer visits your registered address and finds no business activity, no signboard, or different occupants — REG-17 follows. Make sure your address is always updated via amendment if your business moves.
Your reply goes through Form REG-18 on the GST portal. Here's the exact process:
Login to GST Portal → Services → Registration → Application for Filing Clarification
Navigate to the Registration section in the Services menu. The REG-17 notice will appear under "Notices & Orders" tab. Click on it and select "Reply" to open the REG-18 form.
Read the Notice Carefully — Identify the Exact Ground
The notice will state the specific reason for proposed cancellation. Your entire reply should address ONLY that reason. If the ground is non-filing (most common), your strategy is to file all pending returns. If it's business non-existence, you need proof of business activity.
File All Pending Returns BEFORE Submitting REG-18
If the reason is non-filing: file ALL pending GSTR-3B, GSTR-1, and any other pending returns FIRST. Pay all tax dues, interest, and late fees. Then in REG-18, mention that all returns have been filed. This is the strongest response possible — most officers will drop the cancellation proceedings after this.
Prepare Supporting Documents
Depending on the ground: (a) For non-filing — screenshots of filed returns with ARN numbers. (b) For address issues — utility bill, rent agreement, photos of business premises. (c) For fraud allegations — genuine registration documents with supporting evidence. (d) For composition violations — turnover statements showing compliance.
Write a Clear Reply Addressing the Ground
In REG-18, briefly explain why the cancellation should not proceed. Be factual, not emotional. State what corrective action you've taken. Attach supporting documents. Keep it concise — officers review hundreds of replies.
Submit with DSC or EVC Within 7 Working Days
Sign and submit the REG-18 form using Digital Signature Certificate (DSC) or Electronic Verification Code (EVC/OTP). The 7-day deadline starts from the date of service of REG-17. If the notice was served on a Friday, your deadline is the next Friday (excluding Sundays and gazetted holidays).
| Scenario | Officer's Action | Your Next Step |
|---|---|---|
| You reply via REG-18 — officer is satisfied | Drops proceedings. Issues REG-20 (registration restored). No cancellation. | Continue business normally. File returns on time going forward. |
| You reply via REG-18 — officer is NOT satisfied | Issues REG-19 cancellation order with reasons. | Apply for revocation via REG-21 within 30 days (see next section). |
| You don't reply within 7 working days | Issues REG-19 cancellation order without hearing. | Apply for revocation via REG-21 within 30 days. But chances are lower. |
| Officer needs more info after REG-18 | May call for personal hearing or request additional documents. | Attend the hearing with all documents. Cooperate fully. |
If your registration does get cancelled (via REG-19), it's not necessarily the end. You can apply for revocation within 30 days of the cancellation order using Form REG-21. But there are prerequisites that you must complete before applying:
File all pending returns
Every GSTR-3B and GSTR-1 from the effective date of cancellation up to the date of REG-21 application must be filed. This includes paying all outstanding tax, interest (18% p.a.), and late fees.
Pay all outstanding dues
Not just tax — all interest and penalties must be cleared. The portal won't let you submit REG-21 unless you've filed all pending returns.
Submit REG-21 with reasons
Explain why the cancellation should be revoked. If the original ground was non-filing and you've now filed all returns, state that clearly. Attach proof of compliance.
Officer processes within 30 days
The officer should dispose of the REG-21 application within 30 days. If satisfied, they'll issue REG-22 (revocation order) and your GSTIN becomes active again. If not satisfied, they'll issue REG-05 (rejection) — you can then appeal.
Important: The 30-day revocation window is strict. Missing it means you'll need to apply for fresh registration — and you'll lose your old GSTIN. The GST Council has occasionally extended this deadline through amnesty schemes (up to 90 days in some cases), but don't count on it. Apply within 30 days.
People sometimes think "if my registration is cancelled, at least I won't have to file returns." That's wrong. Cancellation creates more problems, not fewer:
⚠️ You must file GSTR-10 (Final Return)
Within 3 months of cancellation date or date of cancellation order, whichever is later. This requires details of stock held on the cancellation date and tax payable on that stock.
⚠️ ITC reversal on remaining stock
You must reverse all input tax credit on stock, semi-finished goods, finished goods, and capital goods held on the date of cancellation. This can be a significant refund to the government.
⚠️ Your buyers lose ITC
Any ITC claimed by your buyers on purchases from you (from the effective cancellation date) will be reversed. This damages your business relationships — buyers won't want to deal with you.
⚠️ Can't issue tax invoices
Without active GST registration, issuing a tax invoice with GST is illegal. You can only issue bills of supply (like unregistered dealers). Your B2B customers will avoid you.
⚠️ Fresh registration hassle
If you don't get revocation, you'll need to apply for new registration. This means a new GSTIN, updated details with all business partners, and potentially another physical verification visit.
⚠️ Compliance rating impact
Cancellation is recorded permanently in the GST system. Even after revocation or new registration, your compliance history shows the cancellation event, which may trigger future scrutiny.
File GSTR-3B and GSTR-1 every month (or quarter) — even if nil. The 6-month non-filing trigger is the most common reason for REG-17. Set calendar reminders or use our Due Date Calendar tool.
Keep your registered address updated. If you move premises, file an amendment immediately. Officers do conduct address verification visits.
If you're not doing business anymore, apply for voluntary cancellation via REG-16 instead of just stopping compliance. Voluntary cancellation is cleaner than forced cancellation.
Monitor the GST portal regularly. REG-17 notices appear in your dashboard and registered email. Don't ignore portal notifications.
If you're a composition dealer, track your turnover carefully. The moment you cross ₹1.5 crore, switch to regular scheme proactively.
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Disclaimer: This guide is for educational and informational purposes only. GST registration cancellation and revocation rules depend on your specific circumstances and jurisdiction. Time limits mentioned are from relevant CGST Act sections and rules. Always consult a qualified GST practitioner before responding to REG-17.
Last updated: March 2026 | Based on CGST Act 2017 Section 29 & CGST Rules 22-23