Reverse Charge Mechanism Under GST: How RCM Works and Who Pays

Most of GST runs on one simple assumption: the seller collects tax from the buyer and deposits it with the government. Reverse charge flips that around. For a defined list of goods and services, and for certain purchases from unregistered suppliers, the law shifts the responsibility for paying GST onto the recipient instead. It isn't a rare, obscure provision either. Any business that hires a goods transporter, pays legal fees to an advocate, pays sitting fees to a director, or pays for a software subscription billed from outside India runs into reverse charge on a routine basis, whether or not anyone has flagged it. Knowing when it applies, and how the tax paid under it comes back as credit, is basic GST hygiene rather than a niche topic reserved for large manufacturers.

Why the Liability Shifts to the Recipient

Reverse charge exists mainly to plug collection gaps in situations where relying on the supplier to register, invoice correctly, and deposit tax isn't practical. Two separate provisions create it. Section 9(3) of the CGST Act lets the government notify specific categories of goods and services where the recipient always pays the tax, regardless of whether the supplier is registered. Section 9(4) is narrower and applies only to specified supplies received from an unregistered supplier, where the government has separately notified that particular class of transaction, most notably certain purchases made by real estate promoters. One detail catches a lot of first-time buyers off guard: registration becomes compulsory for anyone liable to pay tax under reverse charge. Section 24 removes the usual turnover-based registration threshold entirely for this situation, so a small business that would otherwise stay comfortably unregistered can still be pulled into GST purely because of one reverse-charge purchase.

What Actually Falls Under RCM

• Goods transport agency (GTA) services, for specified categories of recipients such as registered businesses, factories, and body corporates
• Legal services provided by an advocate or a firm of advocates to a business entity
• Services provided by a director to their company, including sitting fees and commission
• Sponsorship services provided to a body corporate or a partnership firm
• Security personnel services supplied by anyone other than a body corporate to a registered person
• Renting of any property other than a residential dwelling, where the landlord is unregistered and the tenant is a registered person
• Import of services from a supplier located outside India, for business purposes
• Specified raw goods such as raw cotton, tendu leaves, and unprocessed cashew nuts, bought from an agriculturist or an unregistered seller

Import of services deserves a second look, because it applies without needing to check against any notified list: whenever a registered business pays a supplier located outside India for a service used in that business, GST is due under reverse charge on that payment, subject only to a narrow exemption for genuinely personal imports. It's one of the most commonly missed triggers, since the invoice carries no Indian GSTIN and the bill often gets processed as a routine foreign expense without anyone checking its GST treatment at all. The list of notified goods and services isn't frozen either; the GST Council reviews and amends it periodically, so a category that didn't attract reverse charge a couple of years ago isn't guaranteed to stay that way.

How Payment and the ITC Claim Actually Work

Because the supplier under reverse charge is often unregistered, or isn't the one raising a tax invoice even when registered, the recipient takes on some of the supplier's usual paperwork. Where the supplier is unregistered, the recipient issues a self-invoice at the time of receiving the goods or service, and a separate payment voucher when actually paying the supplier. The tax itself has to be deposited in cash through the electronic cash ledger; it cannot be settled by adjusting existing input tax credit, even with a healthy credit balance sitting unused. Timing follows its own rule too, rather than the usual invoice-based one: liability arises on the earliest of the date of payment, a fixed number of days after the invoice date (30 days for goods, 60 for services), or, failing both, the date the transaction is entered in the recipient's own books.

The tax paid isn't a dead cost, though. Once paid, it can usually be claimed back as input tax credit in the same period, provided the underlying purchase meets the ordinary conditions for ITC under Section 16, meaning it's used for business purposes and doesn't fall on the blocked list. Because the cash outflow and the credit claim typically happen back to back in the same return, reverse charge tends to be close to tax-neutral in cash flow terms for a business that's fully entitled to credit. The exception is a business making exempt supplies, or one where the underlying purchase itself is a blocked credit, where the RCM tax paid turns into a genuine cost rather than a pass-through.

Reverse charge trips up businesses less because the rule itself is complicated and more because it hides inside transactions that don't look like typical purchases: a director's fee, a foreign software subscription, a security contractor's monthly bill. The safest habit is checking every new vendor payment against the reverse-charge list before assuming GST doesn't apply just because the vendor never charged it. A missed RCM liability doesn't stay quiet either. It tends to surface later as tax plus interest for the delay, on top of whatever penalty a scrutiny might add, for a mistake a five-minute check at the time of booking the expense would have caught.