Reverse Charge Mechanism under GST

Reverse Charge Mechanism under GST: A Practical Guide for FY 2026-27

Under the Reverse Charge Mechanism (RCM), the recipient of goods or services — not the supplier — is liable to pay GST directly to the government. Governed by Section 9(3) and 9(4) of the CGST Act, 2017, and mirrored in the IGST Act, RCM applies to specific notified categories and to purchases from unregistered persons in prescribed situations. With CBIC tightening GSTR-2B reconciliation enforcement and Union Budget 2026 widening RCM's reach for certain cross-border and digital services, every registered business must embed RCM checks into its monthly purchase-to-pay cycle — not treat it as a year-end clean-up exercise.

What Is Reverse Charge Under GST and When Does It Apply?

In the ordinary GST flow, the supplier charges tax on the invoice, collects it from the customer, and remits it to the government. RCM inverts this: the registered recipient calculates the applicable GST, pays it directly from its electronic cash ledger, and — in most cases — recovers it as Input Tax Credit (ITC) in the same or a subsequent filing period.

Two provisions trigger RCM under the CGST Act:

• Section 9(3) covers specific goods and services notified by the government. The trigger is the category of supply itself, irrespective of whether the supplier is GST-registered.
• Section 9(4) applies when a registered person receives notified categories of goods or services from an unregistered supplier. After years of deferral and partial operation, Section 9(4) is now operative for specific commodities such as raw cotton supplied by agriculturists to registered manufacturers.

For transactions crossing state borders or involving imports, the parallel provisions are Section 5(3) and 5(4) of the IGST Act, 2017.

Why RCM Exists

RCM solves two structural problems. First, certain suppliers — individual lawyers, small transport operators, foreign service providers — are either outside the GST net or operationally difficult to audit. Shifting the liability to the (usually larger, auditable) recipient ensures tax collection without needing to register every small-scale supplier. Second, for imports of services there is no supplier within India's jurisdiction at all, making the recipient the only practical point of collection.

Transactions Attracting RCM in FY 2026-27

The primary source of RCM obligations is Notification No. 13/2017-Central Tax (Rate) for services and Notification No. 4/2017-Central Tax (Rate) for goods, as amended through FY 2026-27. Your finance team must maintain a live master list of all vendor categories below.

Services under Section 9(3) — key categories:

1. Goods Transport Agency (GTA) — where the GTA has not exercised the option to pay under forward charge. Specified recipients (factories, registered persons, body corporates, partnership firms, and others) must pay GST at 5% under RCM.
2. Legal services — from an individual advocate or a firm of advocates to any business entity. Rate: 18%.
3. Director services — sitting fees, commission, or any remuneration paid by a company to its directors who are not employees. Rate: 18%.
4. Sponsorship services — provided to a body corporate or partnership firm. Rate: 18%.
5. Arbitral tribunal services — to a business entity. Rate: 18%.
6. Import of services — any service received by a person in India from a supplier located outside India. Rate: applicable IGST rate for that service category.
7. Renting of motor vehicles — by a non-body-corporate supplier opting to pay at 5%, provided to a body corporate. Rate: 5% under RCM.
8. Security services — provided by any person other than a body corporate to a registered person. Rate: 18%.
9. Services by author, music composer, photographer, etc. — to a publisher registered under GST. Rate: 12%.

Goods under Section 9(3) — key categories:

• Raw cotton supplied by an agriculturist to a registered manufacturer.
• Specified forms of lottery.
• Cashew nuts (not shelled/peeled), silk yarn, and tobacco leaves supplied in prescribed circumstances — verify current commodity scope in the notification.

> FY 2026-27 alert: As notified following Union Budget 2026, RCM coverage has been extended for certain categories of digital services and online intermediary platforms where the underlying service provider is unregistered. Check the relevant amending CBIC notification before classifying a new digital vendor.

How to Pay RCM: Cash Is the Only Option

This is the single rule that trips up most businesses: RCM liability cannot be offset using the ITC balance in your electronic credit ledger. You must pay it in cash through the electronic cash ledger. Rule 86(2) of the CGST Rules 2017 makes this non-negotiable.

The practical implication: even a business sitting on a credit surplus of Rs. 10 lakh must arrange fresh cash to discharge RCM. Netting RCM against accumulated credit appears as non-payment in departmental scrutiny and attracts interest at 18% per annum from the due date.

Time of Supply: Which Month Does the Liability Fall In?

Getting the correct month right is critical because interest accrues from the due date of the month in which the time of supply falls — not from when you actually pay the vendor.

For services (Section 13(3) of CGST Act): Time of supply is the earlier of:

• Date of payment entered in the recipient's books (or the date it is debited to the bank account), or
• The date immediately following 60 days from the date of the supplier's invoice.

For goods (Section 12(3)): Time of supply is the earlier of:

• Date of receipt of goods, or
• Date immediately following 30 days from the supplier's invoice date.

Worked illustration of timing: Techbridge Pvt. Ltd. receives a legal advisory invoice dated 1 April 2026 but processes payment only on 10 June 2026. Time of supply for services = earlier of (a) 10 June and (b) 31 May (60 days from 1 April) = 31 May 2026. The RCM liability belongs in the May 2026 GSTR-3B (due 20 June). If Techbridge includes it only in the June return, interest runs from 20 June to the actual payment date — a small number per transaction, but a pattern the GST portal's analytics now flags automatically.

Step-by-Step Payment Sequence

1. Identify the RCM invoice in the purchase register at the point of booking.
2. Determine the correct time of supply using the 30-day / 60-day rule above.
3. Compute CGST + SGST (intra-state transaction) or IGST (inter-state or import).
4. Deposit cash into the electronic cash ledger via Challan PMT-06 on the GST portal (QRMP scheme quarterly filers use PMT-06 for the first two months and consolidate at quarter-end in GSTR-3B).
5. Declare and pay the liability in Table 3.1(d) of GSTR-3B for the correct month.
6. Claim ITC in Table 4(A)(3) (domestic RCM) or 4(A)(2) (import of services) of the same GSTR-3B only after confirming the cash payment is settled.

Self-Invoice and Payment Voucher: Your Two Mandatory Documents

When you purchase from an unregistered supplier, or when you import services from outside India, the supplier cannot issue a GST-compliant tax invoice. The law therefore requires the registered recipient to generate two documents:

Self-Invoice [Section 31(3)(f)]: Issued by the registered recipient, treating itself as the supplier for documentation purposes. Mandatory fields:

• Recipient's name, address, and GSTIN
• Sequential serial number within the financial year
• Date of issue (at the time of supply, not at payment)
• Description, quantity, and value of goods or services
• Applicable tax rate and tax amount (CGST/SGST or IGST)

Payment Voucher [Section 31(3)(g)]: Issued at the time of making payment to the supplier. It links the cash consideration to the self-invoice and creates a complete paper trail.

For registered suppliers under RCM — a GTA firm, an advocate's LLP, a security agency — the supplier issues a normal tax invoice. The supplier must mention "Reverse Charge: Yes" on the face of the invoice. You use that supplier invoice as your source document; no self-invoice is required.

Timing requirement: Self-invoices must be issued at or near the time of supply, not in bulk at financial year-end. Batch-issuing 11 months of self-invoices in March is both a legal irregularity and a reconciliation red flag during audit.

Worked Example: Three RCM Scenarios with Rs. Numbers

Scenario 1 — Monthly Law Firm Retainer

Techbridge Pvt. Ltd. (Pune, registered, taxable supplies) pays a monthly retainer of Rs. 1,20,000 to a partnership law firm for ongoing legal advisory. Section 9(3) applies. Rate: 18% GST.

Net annual tax cost to Techbridge: zero — the cash goes out and comes back as credit. The only real impact is monthly cash-flow timing. The law firm neither charges GST nor deposits any; its invoice simply states "Reverse Charge Applicable."

Scenario 2 — Independent Director Sitting Fees

Northstar Industries Ltd. pays independent director Mr. Arjun Sharma Rs. 75,000 per quarter for attending board meetings (same state, intra-state supply). Section 9(3) applies; director is an individual, not GST-registered.

Northstar issues a self-invoice each quarter and a payment voucher at the time of transfer. Supporting documents: board resolution confirming the nature of services and director attendance records. If Mr. Sharma were classified as a whole-time director under an employment contract, RCM would not apply — that distinction must be documented.

Scenario 3 — Import of Software Consultancy (with Late-Payment Interest)

Axiom Analytics LLP (Hyderabad) engages a US-based data firm for a project. Foreign invoice value: USD 8,000. RBI reference exchange rate on the date of supply: Rs. 85/USD. INR equivalent: Rs. 6,80,000.

What if payment is delayed? The foreign supplier's invoice is dated 1 May 2026. Time of supply = 60 days later = 30 June 2026 (or the date of actual payment, whichever is earlier). Axiom books and pays on 15 August 2026.

• Time of supply remains 30 June 2026 (60-day rule triggers first).
• RCM was due in the June 2026 GSTR-3B, filed by 20 July 2026.
• Axiom pays only in the August 2026 filing — a 31-day delay on Rs. 1,22,400.
• Interest = Rs. 1,22,400 × 18% × 31/365 = Rs. 1,876.

Individually small, but repeat this pattern across multiple foreign vendors and the CBIC's compliance analytics will flag the mismatch between the foreign remittance date in the bank statement and the GSTR-3B declaration date.

How to Claim ITC on RCM — and When You Cannot

ITC on RCM is governed by Section 16 of the CGST Act, with one critical addition: Section 16(2)(d) provides that ITC is available only after the tax on that supply has actually been paid to the government. You cannot provisionally claim RCM ITC in anticipation of paying the cash — the payment and the ITC claim must be in the same GSTR-3B, or the ITC claim must follow the payment in a later period.

When ITC is fully available:

• The supply is used in furtherance of taxable business.
• You hold the valid document (supplier's invoice marked "Reverse Charge: Yes", or your self-invoice for unregistered-supplier purchases).
• The RCM tax has been paid in cash via GSTR-3B for the correct period.
• The return for that period has been filed.

When ITC is blocked or restricted:

1. Exempt-supply businesses: If your business makes both taxable and exempt supplies, RCM ITC must be apportioned. The portion attributable to exempt supplies reverses under Rule 42 (inputs and input services) or Rule 43 (capital goods). This is frequently missed by companies with mixed portfolios — a hospital providing both exempt healthcare and taxable pharmacy services, for example.

1. Blocked credits under Section 17(5): Even if discharged under RCM, certain supplies — motor vehicles for personal use, food and beverages, club memberships, and health insurance in most circumstances — cannot be claimed as ITC regardless of how the tax was paid.

1. Composition dealers: Taxpayers on the Composition Scheme have no ITC entitlement at all. Every rupee of RCM paid is a pure cost — factor this into pricing and vendor selection.

1. Section 16(4) annual time-bar: ITC must be claimed by the earlier of (a) the due date of the September GSTR-3B of the following year (i.e., 20 October 2027 for FY 2026-27 ITC) or (b) the date of filing the annual return (GSTR-9) for FY 2026-27. Miss this window and the ITC is forfeited permanently — you have paid the cash with no recovery.

GSTR-2B and RCM: For registered RCM suppliers (GTA, security agencies, advocates' firms), their GSTR-1 filing auto-populates your GSTR-2B. For unregistered-supplier RCM (Section 9(4) categories and imports), GSTR-2B will not show anything — you must manually enter ITC in Table 4(A)(3) of GSTR-3B, supported by your self-invoices.

Reporting RCM in GSTR-3B: Table-by-Table Guide

GSTR-3B is a monthly (or quarterly, for QRMP filers) self-declaration. For RCM, four tables are relevant:

Filing sequence within the month:

1. Deposit cash into the electronic cash ledger before submitting GSTR-3B.
2. Enter RCM tax liability in Table 3.1(d) — this debits the cash ledger.
3. Enter ITC in Table 4(A)(3) or 4(A)(2) — this credits the electronic credit ledger.
4. For a purely taxable business, the net cash impact is zero for that period.
5. Submit and file GSTR-3B by the 20th of the following month (monthly filers) or the applicable QRMP date.

Common Mistakes Businesses Make with RCM — and How to Fix Them

These patterns generate the majority of RCM-related departmental notices and audit observations:

1. Paying RCM from the credit ledger. The mistake: Using available ITC to offset RCM in GSTR-3B instead of depositing fresh cash. The fix: Rule 86(2) is unambiguous. Set up a monthly reminder to deposit cash before the GSTR-3B due date. Even a Rs. 1 offset from the credit ledger against RCM will appear as non-payment in the portal.

2. Using the vendor payment date as the time of supply. The mistake: Booking RCM in the month you pay the vendor rather than the month the time-of-supply rule dictates. The fix: Train the accounts payable team to flag any invoice older than 45 days that has not yet had RCM discharged — well before the 60-day trigger crystallises a prior-month liability.

3. Skipping self-invoices for unregistered suppliers. The mistake: Booking the expense but issuing no self-invoice, then claiming ITC. The fix: Any purchase from an unregistered vendor (housekeeping, petty contractors, certain agricultural produce) must generate a self-invoice in the purchase-order system at the time of booking, not at payment.

4. Missing director fees entirely. The mistake: Processing sitting fees and commissions for independent or non-executive directors through payroll or expense claims without flagging RCM. Employee-directors are outside RCM; non-employee directors are fully within it. The fix: Maintain a classification register of all directors — employee vs. non-employee — updated at the start of each financial year and reviewed when board composition changes.

5. Double-paying RCM on GTA invoices. The mistake: A GTA that has opted for forward charge will issue an invoice with GST charged. If the recipient then also pays RCM on the same invoice, tax is paid twice. The fix: Check every GTA invoice for the mention of "Forward Charge" or the presence of a charged GST amount. If tax is already on the invoice, forward charge applies — no RCM.

6. Bulk year-end self-invoicing. The mistake: Generating all 12 months of self-invoices for unregistered vendors in a single March batch. The fix: Self-invoices must be dated at the time of supply. Retroactive batching creates a mismatch between the GSTR-3B monthly data and the self-invoice date, which is a standard audit disallowance ground.

7. Forgetting Section 16(4) annual cut-off. The mistake: Discovering unclaimed RCM ITC from FY 2026-27 during the FY 2027-28 audit, after the September 2027 GSTR-3B has been filed. The fix: Run an ITC reconciliation in September each year — before the cut-off — to identify any unclaimed RCM ITC from the prior financial year and claim it before the window closes.

Key Takeaways

• RCM applies under Section 9(3) for notified categories — legal services, GTA, director fees, import of services, security services, sponsorship, and others — and under Section 9(4) for notified goods or services received from unregistered suppliers.
• RCM liability must always be paid in cash from the electronic cash ledger; using ITC to offset it constitutes non-payment and attracts interest at 18% p.a. from the due date under Rule 86(2) of the CGST Rules.
• Time of supply, not the vendor payment date, determines which month's GSTR-3B carries the liability — 60 days from the invoice date for services, 30 days for goods.
• Issue self-invoices and payment vouchers at the time of each transaction, not in bulk; this is a statutory requirement under Sections 31(3)(f) and 31(3)(g) and is your primary documentary support for the ITC claim.
• ITC on RCM is available only after the tax is actually paid in cash per Section 16(2)(d); it is also restricted for exempt supplies (Rule 42/43 apportionment), blocked under Section 17(5) for specified categories, and entirely unavailable for composition dealers.
• Report RCM tax liability in GSTR-3B Table 3.1(d) and claim ITC in Table 4(A)(3) or 4(A)(2) monthly; for registered RCM suppliers reconcile against GSTR-2B, and for unregistered-supplier RCM reconcile against your own self-invoice register.
• Build and maintain a recurring RCM vendor master — advocates, GTAs, independent directors, foreign service providers — and run a monthly three-way check (invoices booked → cash deposited → GSTR-3B declared) before closing each accounting period. This single habit eliminates the vast majority of RCM audit observations before they arise.