Reverse Charge Mechanism (RCM) Under GST: When the Buyer Pays the Tax

Reverse Charge Mechanism is one of the cleanest examples of a GST provision that looks simple in theory but routinely causes compliance failures: missed self-invoices, RCM tax paid through ITC instead of cash, ITC claimed before payment, and entries not reflected in GSTR-3B Table 3.1(d). Each of these triggers notices, interest under Section 50, and reversal of credits.

This guide covers RCM end to end: what triggers it, how to compute and pay the tax, when and how to claim ITC, and the documentation discipline that survives an audit.

Why RCM Exists

Under the normal GST flow, the supplier collects tax from the buyer and deposits it with the government. The supplier is responsible.

In some sectors, this model breaks down: the supplier may be unregistered (small farmer, individual director), the supply may be cross-border (import of service from a foreign vendor), or the government may want to plug evasion at the recipient's end where the recipient is a large business. RCM shifts the tax-paying responsibility to the recipient.

The legal basis is in Section 9(3) and Section 9(4) of the CGST Act for intra-state supplies, and Section 5(3) and 5(4) of the IGST Act for inter-state supplies (including imports of services).

RCM Buckets

Bucket 1: Section 9(3) Notified Supplies

The government notifies specific goods and services where RCM applies regardless of the supplier's registration status. The most common ones for SMEs:

For goods, the notified RCM list includes cashew nuts (not in shell), bidi wrapper leaves, tobacco leaves, silk yarn, raw cotton (from agriculturist) and lottery (in some states). The recipient pays GST on the purchase value at the notified rate.

Bucket 2: Section 9(4) Limited Notified Persons

Section 9(4) was originally intended to apply RCM on all supplies received from unregistered persons. The provision was deferred multiple times and is now restricted to specified categories.

Currently, the notable Section 9(4) application is for promoters / builders in real estate, who are required to pay RCM on procurement of certain inputs and services from unregistered suppliers (cement above 80% threshold, capital goods etc.) under specific conditions.

For most SMEs outside real estate, Section 9(4) does not apply. Do not assume RCM on every unregistered supplier purchase.

Bucket 3: Imports

The import of a service from a person located outside India is a supply on which the Indian recipient must pay IGST under reverse charge. Common examples: payments to AWS, Google Cloud, Meta Ads, LinkedIn, foreign software providers, foreign consultants.

The IGST rate is the rate that would have applied to the equivalent domestic service. For most digital services, this is 18%.

How RCM Is Discharged

Step-by-Step Guide

RCM Compliance: 5-Step Discharge Process

Follow these steps every time you receive an RCM-applicable supply : Section 9(3), 9(4), or import of service

1

Identify the RCM Trigger

Check your vendor master for the RCM flag. Review whether the supply falls under Section 9(3) notified list (legal services, GTA, import of service) or Section 9(4) for specified registered persons. Update the list quarterly.

Vendor Master

2

Issue a Self-Invoice

Issue a self-invoice under Section 31(3)(f) with your GSTIN, supplier details, supply description, GST rate, and GST amount. Use your own invoice series. A consolidated month-end self-invoice is allowed for multiple unregistered supplier transactions.

Section 31(3)(f)

3

Issue a Payment Voucher

When paying the unregistered supplier, separately issue a payment voucher under Section 31(3)(g). This is distinct from the self-invoice and must be maintained as a compliance document.

Section 31(3)(g)

4

Pay GST Through Cash Ledger

Report RCM liability in GSTR-3B Table 3.1(d) and pay the tax via the electronic cash ledger only. ITC cannot be used to discharge RCM liability per Section 49(4). Payment via challan deposit.

GSTR-3B Table 3.1(d)

5

Claim ITC in the Next Period

Claim ITC of the RCM tax in Table 4(A)(3) of GSTR-3B after tax is paid in cash. Conditions: hold the self-invoice, supply used in business, tax paid to government. Deadline: 30 November of the year following the FY under Section 16(4).

Table 4(A)(3)

Source: CGST Act 2017: Sections 9(3), 9(4), 31(3)(f), 31(3)(g), 49(4), 16(4); IGST Act 2017: Sections 5(3), 5(4)

Step 1: Identify the RCM Trigger

Maintain a vendor master tagged with "RCM applicable: yes/no". Review the list quarterly because the notified list does change with GST Council recommendations.

Step 2: Issue a Self-Invoice

When you receive an RCM-applicable supply from an unregistered person (or from a foreign service provider), issue a self-invoice under Section 31(3)(f). The self-invoice contains:

• Your GSTIN (recipient).
• Supplier's name and address (unregistered or foreign).
• Description of the supply, value, GST rate, GST amount.
• Invoice number from your own series.
• Date.

A consolidated self-invoice can be issued at the end of the month for multiple unregistered supplier transactions, but per-transaction self-invoices are cleaner.

Step 3: Issue a Payment Voucher

When you make payment to the unregistered supplier, issue a payment voucher under Section 31(3)(g). This is separate from the self-invoice.

Step 4: Pay GST Through Cash Ledger

In the GSTR-3B for the period, report the RCM liability in Table 3.1(d). Pay the tax through the electronic cash ledger (cannot use ITC for RCM payment, per Section 49(4)).

Step 5: Claim ITC in the Next Period

ITC of the RCM tax is available subject to the same Section 16 conditions:

• You hold the self-invoice.
• The supply is used in the course or furtherance of business.
• Tax has been paid to the government (RCM payment in cash).
• The ITC is reported in Table 4(A)(3) of GSTR-3B.
• Time limit: Section 16(4) deadline (30 November of the year following the FY).

The cash payment in the current period and the ITC claim in the next period (or even the same period if reported correctly) is the standard cycle. The net cost of RCM is zero for businesses making fully taxable supplies, because the cash paid is recovered as ITC.

For exempt or partially exempt suppliers, the RCM tax becomes a real cost (proportionate ITC reversal under Rule 42/43).

Common Sectors Where RCM Is Missed

• Imports of cloud and software services. Subscription to AWS, Slack, Notion, LinkedIn, Google Workspace, and Meta Ads. SaaS subscriptions are services from a non-taxable territory and attract RCM at 18% IGST.
• Legal fees paid to lawyers. Whether or not the lawyer is GST-registered, the recipient business pays GST on legal fees under RCM.
• Director sitting fees and remuneration. Sitting fees and certain remuneration paid to non-executive directors attract RCM. Salary paid to whole-time directors is not a supply (it is employment) and does not attract RCM.
• GTA freight charges. If the goods transport agency has not opted for forward charge, the consignee or consignor (whichever is liable per the consignment note) pays RCM at 5% (without ITC for GTA) or 12% (with ITC for GTA).

For our coverage of e-commerce sellers and quick-commerce, see our GST compliance for quick commerce sellers post.

Reporting in Returns

GSTR-1 also has fields to capture inward supplies under RCM at year-end.

GSTR-2B reflects RCM-related ITC entries from supplier filings (GSTR-1 of the supplier). For supplies where the supplier is unregistered or foreign, GSTR-2B will not show anything. The recipient relies on the self-invoice for both tax payment and ITC.

RCM Tax Cannot Be Paid Through ITC

This is the most common error. Section 49(4) restricts use of the electronic credit ledger to payment of output tax only; RCM liability must be discharged through the electronic cash ledger. RCM payment must come from the electronic cash ledger (cash deposits via challan).

If a business has accidentally offset RCM liability against ITC, the system does not always block it but the audit trail is checked at scrutiny. Re-pay through cash and reverse the wrong utilisation.

Time Limit for ITC Reclaim

ITC of RCM tax follows the same time limit as regular ITC under Section 16(4):

• On or before the 30th of November following the end of the financial year, OR
• The date of furnishing the annual return, whichever is earlier.

For FY 2025-26 RCM, the latest you can claim ITC is in the GSTR-3B filed on or before 30 November 2026.

Common RCM Errors That Trigger Notices

• No self-invoice on file. Audit immediately disallows the ITC claim.
• RCM paid through ITC. Reversal plus interest under Section 50.
• Wrong rate applied. Especially on import of services where the equivalent domestic rate must be used.
• Supplier was forward-charge GTA but treated as RCM. Some GTAs opt for forward charge; the consignee should not pay RCM on those supplies.
• Director sitting fees treated as salary. Salary is not RCM, but sitting fees are. Misclassification leads to retrospective demand.
• Late RCM payment. Triggers Section 50 interest at 18% per annum.

Action Plan to Tighten RCM Compliance

1. Build a vendor master with an RCM flag. Update it when new vendors are onboarded.
2. Document the self-invoice template in your accounting system (most systems have a self-billing module).
3. Run a monthly RCM register that lists every RCM transaction, the date of self-invoice, the date of payment to supplier, the cash ledger payment date, and the ITC claim period.
4. Reconcile with GSTR-3B Table 3.1(d) and Table 4(A)(3) before filing.
5. Train the AP team to flag transactions with foreign vendors, advocates and GTAs at the time of bill entry, not at month-end.

Where Tax Garden Helps

RCM is one of the most predictable sources of GST notices for SMEs because it sits between the AP team (which sees the supplier bill) and the tax team (which prepares the return). Tax Garden's Compliance Standard plan includes RCM identification, self-invoice generation, cash payment, and ITC reconciliation as part of the monthly GST process.

For related reading on ITC eligibility and reconciliation, see our GSTR-2B reconciliation guide and IMS workflow for SMEs.

Frequently Asked Questions

What is reverse charge under GST?

Reverse charge is a mechanism where the recipient of a supply pays GST to the government instead of the supplier. It applies to specific notified supplies (Section 9(3)), specified persons buying from unregistered suppliers (Section 9(4)), and imports of services (Section 5(3)). The recipient must issue a self-invoice and pay the tax through the electronic cash ledger.

Is GST on legal services payable by the lawyer or the client?

By the client, under reverse charge. Legal services supplied by an advocate or a firm of advocates to a business entity are notified under Section 9(3). The business entity issues a self-invoice and pays GST through cash, then claims ITC subject to Section 16 conditions.

Do I have to pay GST on AWS, Google Cloud or Meta Ads bills?

Yes, under RCM at 18% IGST. These are imports of services from a non-taxable territory. The Indian recipient pays IGST through the cash ledger and claims ITC in the same or next GSTR-3B period.

Can I pay RCM liability using ITC?

No. Section 49(4) restricts RCM payment to the electronic cash ledger. ITC cannot be used to discharge RCM liability. ITC of the RCM tax becomes available after the cash payment, in line with Section 16.

What is a self-invoice and when do I issue it?

A self-invoice is an invoice issued by the recipient (you) under Section 31(3)(f) when receiving an RCM-applicable supply from an unregistered or foreign supplier. It contains the same fields as a regular invoice but is generated from the recipient's invoice series. It is required to support both the RCM tax payment and the ITC claim.

What if I missed paying RCM in earlier months?

Pay the RCM tax with interest under Section 50 (18% per annum from the due date of the original GSTR-3B). Disclose the corrected liability in the next GSTR-3B Table 3.1(d). Claim ITC of the paid amount in the same or subsequent month, subject to the Section 16(4) time limit.

Sources

This guide is verified against Sections 9(3), 9(4), 31, 49 of the CGST Act 2017, Sections 5(3), 5(4) of the IGST Act 2017, Notification No. 13/2017-Central Tax (Rate) and its successive amendments listing notified RCM supplies, and the GSTN advisories on self-invoicing for unregistered suppliers. Practitioner cross-checks from ClearTax, IRIS GST, TaxGuru, IndiaFilings and CAClubIndia were reviewed for current rate and procedural positions. Always validate the latest notified list against cbic.gov.in before classifying a supply as RCM.