Reverse Charge Mechanism (RCM) Under GST, Made Simple

Normally, the seller collects GST and pays it to the government. Under the Reverse Charge Mechanism (RCM), that responsibility flips — the buyer becomes liable to pay the GST, even if the seller didn't charge it. For small businesses and freelancers, this catches people off guard more often than almost any other GST rule.

Normal Charge vs Reverse Charge

Under the forward charge (the default), the supplier charges GST on their invoice, collects it from the buyer, and deposits it with the government. The buyer may then claim that GST as input tax credit.

Under reverse charge, the supplier issues an invoice without GST. The buyer self-assesses the GST liability, pays it directly to the government, and — if they are a registered business — can often claim it back as ITC. The net cash cost may be zero, but the compliance obligation is entirely on the buyer.

RCM applies in two main situations:

1. Notified categories of goods and services — specific types of supply where the government has decided reverse charge applies regardless of who the supplier is (Section 9(3) of the CGST Act). Legal services, GTA, import of services, and director remuneration are among the most commonly encountered categories.
2. Purchases from unregistered suppliers in specified scenarios — under Section 9(4) of the CGST Act, a registered business buying from an unregistered dealer can attract RCM. However, the blanket rule that originally applied to all such purchases was suspended in 2017 and was later re-notified in a narrower form. Today, Section 9(4) RCM applies only to specified categories of persons and supplies notified by the government — the most prominent current example is promoters in the real estate sector purchasing goods or services from unregistered persons. For most regular businesses and freelancers, Section 9(4) RCM is not a routine obligation on every purchase from an unregistered vendor. Confirm with your CA whether any of your purchases fall within the currently notified categories.

Everyday RCM Examples (Legal, Freelance Services, GTA, Imports)

Understanding RCM in the abstract is hard; seeing it in real transactions makes it click.

Legal services from an advocate: If your business retains an individual advocate or a law firm, and you are a registered business, you (the client) are liable to pay GST on that fee under RCM. The advocate does not charge GST on their invoice.

Goods Transport Agency (GTA): When you hire a GTA to move goods, the GTA typically does not charge GST — instead, the consignor or consignee (whoever is the registered recipient) pays GST under RCM on the freight.

Import of services: If you pay for a subscription to foreign software, a global SaaS platform, or a service from a non-resident provider, that qualifies as an import of services. You must pay IGST on the transaction under RCM, even though the foreign supplier cannot register in India.

Director's remuneration: Payments to a non-employee director of a company attract RCM — the company must pay GST on the director's fees.

Renting from an unregistered landlord: In some states and situations, if your business rents commercial property from an unregistered landlord, RCM may apply.

What You Must Do When RCM Applies

If you are the buyer in an RCM transaction, here is what compliance looks like:

1. Identify the transaction

   Determine whether the supply falls under a notified RCM category (Section 9(3)) or involves an unregistered supplier in a currently notified scenario (Section 9(4)). If unsure, a CA can confirm whether a specific transaction triggers RCM.

2. Calculate the GST

   Apply the GST rate applicable to that good or service. For imported services, the applicable rate is IGST at the same rate as would apply to a domestic supply of that service. For intra-state supplies, you pay CGST + SGST; for inter-state, IGST.

3. Pay the tax in cash — ITC cannot be used

   This is a critical distinction: RCM GST liability must be discharged in cash from your Electronic Cash Ledger. You cannot offset RCM liability with ITC sitting in your Electronic Credit Ledger. This means if you have ₹10,000 of RCM liability for the month, you must have ₹10,000 cash in your GST account — existing ITC does not reduce this obligation at the payment stage.

4. Issue a self-invoice or payment voucher

   For purchases from unregistered suppliers in notified categories, you must issue a self-invoice (the buyer prepares the invoice themselves) on the date of receipt of goods/services, and a payment voucher on the date of payment. These documents substantiate the transaction and are required for claiming ITC. For notified services like legal fees from an advocate, the invoice format requirements also apply.

5. Report in GSTR-3B

   Declare the RCM liability in Table 3.1(d) of GSTR-3B (as tax payable under reverse charge). Report the eligible ITC arising from that RCM payment in Table 4(A)(3). Both entries go in the same return period.

RCM and Input Credit

The silver lining of RCM is that, in most cases, the GST you pay under reverse charge is eligible to be claimed back as input tax credit — in the same tax period in which you pay it. So for a GST-registered business, the cash outflow is temporary: you pay it this month and claim it back in the same GSTR-3B filing, leaving your net tax cost at zero.

However, several conditions must be met for ITC to be available on RCM payments:

• You must be a GST-registered taxpayer.
• The goods or services must be used for business purposes (not personal use, not exempt supplies).
• The supply must not fall on the list of blocked credits under Section 17(5) of the CGST Act — for example, food and beverages, club memberships, personal motor vehicles, and certain works contract services are blocked regardless of how the tax was paid.
• The tax must have actually been deposited — ITC on RCM is available only after the cash payment clears, not merely on accrual.
• The required documentation (self-invoice, payment voucher) must be in order.

The same-period ITC recovery means that for eligible transactions, RCM is primarily a cash flow and compliance consideration rather than an extra tax cost. You need to have enough cash in your GST account to cover the RCM payment, even if you will recover it within the same filing. Businesses with tight monthly cash flow sometimes find this inconvenient, particularly for large freight or import-of-services transactions.

For businesses that are not GST-registered (below the threshold or dealing only in exempt supplies), there is no ITC recovery mechanism — the RCM tax paid becomes a direct cost. Similarly, for blocked credit categories, the cash outflow is permanent.

Understanding RCM is especially important when you're reviewing your GSTR-1 & GSTR-3B obligations — the returns where RCM is reported. It also ties closely to how CGST, SGST, and IGST work, since the type of tax (IGST for cross-border, CGST+SGST for intra-state) depends on the transaction. For the broader picture of what belongs on a compliant invoice, see the GST invoice format guide.