Short answer: Under GST, Reverse Charge Mechanism (RCM) shifts the tax liability from the supplier to the recipient for specified services. If your company receives GTA freight, legal fees, director remuneration as a service, sponsorship, security (non–body corporate supplier), or similar notified services, you must pay GST, issue a self-invoice within 30 days, report it in GSTR-3B, and claim input tax credit (ITC) only after paying that GST to the government — not before. Most SME compliance gaps come from missing director fees, GTA rate confusion, and late self-invoices.

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What Is RCM and Why Does It Exist?

Under the normal forward charge, the supplier collects GST from the buyer and deposits it with the government. Under Reverse Charge Mechanism (RCM), the recipient of the supply is liable to pay GST directly to the government.

RCM exists for three practical reasons:

• Compliance coverage — Many notified suppliers (advocates, individual directors, GTAs, authors) are unregistered or hard to track; taxing the recipient (usually a registered company) improves collection.
• Policy choice — Certain sectors (GTA, sponsorship, insurance agency) are deliberately taxed at the recipient end to reduce cascading or to give the recipient control over rate/ITC options.
• Level playing field — Registered companies cannot escape GST merely because their counterparty is unregistered or exempt from registration.

For companies, RCM is not optional. Missing an RCM entry means under-reported tax, interest and penalty exposure, and ITC wrongly claimed before payment.

Statutory basis: Section 9(3) of the CGST Act, 2017 empowers the Government to notify categories of goods or services on which tax is payable by the recipient on reverse charge basis.

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Section 9(3) vs Section 9(4): What Companies Must Know

Key takeaway for finance teams: Your monthly GST working must focus on s.9(3) notified services — not on hunting every unregistered vendor. The compliance risk for companies in 2026 is overwhelmingly in the notified service list, not s.9(4).

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10 Most Common RCM Categories for Companies

Use this table as your first-pass filter every month. If a row matches a payment your company made, RCM likely applies.

Trap — GTA rate confusion: A GTA may now opt for forward charge (supplier pays GST). Before applying RCM, confirm whether your transporter has opted for forward charge and whether they charge 5% (no ITC) or 12% (with ITC). If forward charge applies, RCM does not — but your ITC position changes accordingly (Notif. 11/2017-CT, Sl. No. 9 & 9A; Notif. 13/2017-CT, Sl. No. 1).

Trap — Director fees: Sitting fees, commission, and other payments to directors in their individual capacity attract RCM on the company (Notif. 13/2017-CT, Sl. No. 7). This is the single most missed RCM item in SME GST returns.

Trap — Advocate / legal fees: External counsel invoices rarely include GST when the advocate is unregistered. The company must self-assess 18% RCM and include it in monthly workings (Notif. 13/2017-CT, Sl. No. 2).

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Self-Invoice Requirement: Rule 47, CGST Rules

When your company is liable to pay tax under RCM — including on supplies from unregistered persons — you must issue a self-invoice.

Practical note: For registered suppliers where RCM still applies (e.g. GTA on reverse charge), the supplier's invoice may not show GST. Your self-invoice (or an internal RCM tax invoice) becomes the document supporting both the tax payment and eventual ITC claim.

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ITC on RCM: Section 41 Condition

Companies often assume ITC on RCM is automatic once the expense is booked. It is not.

Section 41, CGST Act, 2017 (as aligned with the post-2022 ITC framework) provides that input tax credit in respect of invoices or debit notes relating to supplies on which tax is payable under RCM can be availed only after the recipient has discharged the tax liability — i.e. after the RCM GST amount is actually paid to the government (reflected in the electronic cash ledger / GSTR-3B).

Trap: Claiming ITC in the same month as the expense but before depositing RCM tax is a common error caught in GST audits. Match ITC to the month of tax payment, not merely the month of invoice or expense recognition.

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Monthly RCM Compliance Checklist (10 Items)

Use this checklist at month-end before filing GSTR-3B:

• Scan all vendor payments against the 10-category table above — especially legal, freight, security, and director payments.
• Confirm GTA status for each transporter: forward charge or RCM; 5% or 12% rate; ITC eligibility.
• Check director payments — sitting fees, commission, and reimbursements to directors in individual capacity (Notif. 13/2017-CT, Sl. No. 7).
• Review legal and arbitration bills — external counsel, law firms, arbitral tribunal fees (Sl. No. 2 & 2A).
• Identify sponsorship spend — event, sports, and brand sponsorship to body corporate (Sl. No. 4).
• Issue self-invoices for all RCM supplies within 30 days of payment (Rule 47).
• Calculate RCM tax separately in the GST working paper with notification reference for each line.
• Report RCM in GSTR-3B Table 3.1(d) under reverse charge inward supplies.
• Pay RCM liability through cash ledger before claiming ITC (s.41).
• Reconcile RCM self-invoices with GSTR-2B, books, and payment challans; retain notification citation in the audit file.

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Frequently Asked Questions

1. Does RCM apply if the supplier is already registered and charging GST?

For most s.9(3) services (advocate, director, GTA on RCM option), the supplier may be unregistered or may not charge GST because liability sits with you. Always check the specific notification entry, not just the supplier's registration status. GTA is the main exception where a registered supplier may charge GST under forward charge — removing your RCM obligation.

2. We paid director sitting fees through payroll. Is RCM still required?

If the payment is for services by a director to the company in individual capacity (sitting fees, commission, etc.), RCM under Notif. 13/2017-CT, Sl. No. 7 applies on the company. Pure salary under employment contract is a different treatment; sitting fees and similar board remuneration typically fall under RCM. Document the character of each payment.

3. What happens if we miss the 30-day self-invoice deadline?

Rule 47 requires a self-invoice within 30 days of payment. Late or missing self-invoices create ITC risk, reconciliation gaps, and exposure in scrutiny. Issue the self-invoice immediately upon discovery and maintain a log of delays with reasons for any audit response.

4. Can we claim ITC on RCM GST in the same month we book the expense?

Only if you have paid the RCM tax to the government in that month (s.41). Booking the expense in accounts is not sufficient. The ITC trigger is tax payment, not expense recognition or vendor payment alone.

5. Is security service always under RCM?

No. RCM applies when security services are supplied by any person other than a body corporate to a registered person (Notif. 13/2017-CT, Sl. No. 11, as amended by Notif. 29/2018-CT). If your security vendor is a private limited company or LLP (body corporate), the supplier charges GST under forward charge and RCM does not apply to you.

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Check RCM Applicability Before You File

Not every payment triggers RCM — but missing one that does costs more than over-reporting. Use the free RCM applicability checker to map your vendor payments against the current notification list before finalising GSTR-3B.

Check RCM applicability → /tools/rcm-applicability

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Reviewed by CA Harun Raaj, ICAI Membership No. 238303. Statute: CGST Act 2017 s.9(3); Notification 13/2017-CT; Rule 47 CGST Rules 2017. Last verified: 2026-08-05.

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