Under the GST reverse charge mechanism, the normal tax-payment responsibility is reversed: for a covered supply, the recipient becomes liable to pay GST instead of the supplier. That sounds simple, but the accounting workflow is easy to get wrong because a finance team must first identify whether a transaction is actually covered, determine the correct tax and time of supply, discharge the liability in cash, and then separately evaluate input tax credit.
The statutory definition is in section 2(98) of the CGST Act. CBIC's CGST Act text defines reverse charge as liability on the recipient under section 9(3) or 9(4) of the CGST Act, or the corresponding provisions of the IGST Act. The key practical point is that RCM is not a general rule for every purchase: applicability must be tied to the law and the relevant notification or provision covering that supply.
Normal charge and reverse charge are different workflows
Under normal charge, the supplier generally charges GST on the invoice, collects it from the customer and pays it to the Government. The eligible recipient then evaluates ITC on that supplier-charged tax. Under reverse charge, the recipient itself becomes the person liable for the GST on the covered inward supply.
This distinction matters for ledger design. A purchase expense and an RCM tax liability may arise from the same commercial transaction, but the GST liability is not simply ordinary supplier GST waiting to be claimed from an invoice. The recipient needs a separate RCM control trail.
Step 1: identify whether the inward supply is actually covered
Section 9(3) allows the Government, on the GST Council's recommendations, to notify categories of goods, services or both for which the recipient pays tax. Therefore, a robust accounts-payable process should not flag RCM merely because a vendor is small, unusual or unregistered. The team should map the nature of supply, supplier status where relevant, recipient status and the applicable notification before booking the liability.
A practical RCM master should record the supply category, legal basis, tax rate, vendor type, recipient condition, place-of-supply treatment and effective period. This is safer than asking staff to remember a static list, because notifications and conditions can change.
Step 2: determine the tax period correctly
The time-of-supply rules for reverse charge differ from ordinary supplies. The CGST Act text provides a specific rule for goods and another for services. For goods under reverse charge, section 12(3) uses the earliest of receipt of goods, the prescribed payment date test, or the date immediately following 30 days from the supplier's invoice or equivalent document, with a fallback where those tests cannot determine the time. For services, section 13(3) generally uses the earlier of the prescribed payment date test or the date immediately following 60 days from the supplier's invoice or equivalent document, again subject to the statutory fallback and the special associated-enterprise rule for specified cross-border services.
The practical lesson is important: do not determine the RCM month solely from the month in which the accounts team happens to notice the invoice.
Step 3: pay reverse-charge tax through cash, not ITC
RCM tax cannot be discharged by using the electronic credit ledger. CBIC clarified this in Circular No. 172/04/2022-GST: the statutory definition of output tax excludes tax payable under reverse charge, so the electronic credit ledger cannot be used to pay that RCM liability. Finance teams should therefore forecast the cash requirement even where the entity has a large unused ITC balance.
This creates a common working-capital trap. A business may be in a net-credit position for ordinary GST but still need cash in the electronic cash ledger to settle RCM.
Step 4: evaluate ITC separately after recognising the liability
RCM does not automatically mean the tax is a permanent cost. Section 2(62) of the CGST Act includes tax payable under reverse-charge provisions within the definition of input tax. Accordingly, eligible RCM tax can enter the ITC framework, subject to the applicable conditions and restrictions.
That means there are two separate questions: first, must the recipient pay GST under RCM; second, is the resulting input tax eligible for credit? A yes to the first does not guarantee a yes to the second. Business use, documentary conditions, blocked-credit rules and other ITC restrictions still need to be tested.
Step 5: report the transaction in the correct return buckets
The GST Portal's GSTR-3B user guide specifically recognises inward supplies liable to reverse charge in the return workflow and separately identifies ITC available on inward supplies liable to reverse charge. This reinforces why RCM liability and RCM credit should not be netted informally in the books.
A clean reconciliation should connect the RCM purchase register, liability booked, cash paid, GSTR-3B liability reporting, eligible credit claimed and the general ledger. Differences should be investigated before return filing rather than carried indefinitely as unexplained balances.
Worked illustration
Assume an Indian company receives a service that its tax team has verified as falling under a current reverse-charge notification. The supplier's commercial invoice records the service value, but the recipient is legally responsible for the GST. The accounts team should identify the applicable tax and time of supply, book the RCM liability, discharge that tax through the electronic cash ledger, report it in the appropriate GSTR-3B reverse-charge field and then test whether the tax qualifies as ITC. If the service is used for business and the credit satisfies the applicable ITC conditions and is not blocked, the eligible credit can be accounted for and reported in the relevant ITC field. The cash payment and credit are separate steps, not a net settlement.
Month-end RCM checklist
- Extract inward supplies from the purchase and expense ledgers, including manual journals and employee-reimbursed business expenses where relevant.
- Run them against a maintained RCM applicability matrix rather than a generic vendor flag.
- Verify the current notification or statutory provision for each material category.
- Check the correct GST rate and whether CGST plus SGST or IGST applies.
- Determine the time of supply under the RCM rules instead of using the booking date by default.
- Book the tax liability separately from the underlying expense or asset.
- Ensure sufficient electronic cash ledger funding because RCM liability cannot be paid from the electronic credit ledger.
- Test ITC eligibility independently, including business nexus and blocked-credit restrictions.
- Reconcile RCM liability and eligible ITC to GSTR-3B and the general ledger.
- Retain the invoice, payment trail, legal-basis mapping, calculation and review evidence as part of the compliance working papers.
Common mistakes
- Treating every unregistered-vendor purchase as automatically subject to RCM. Applicability must be tested under the current law and notifications.
- Using available ITC to settle RCM. The electronic credit ledger cannot be used for reverse-charge liability.
- Netting liability and credit in accounting. Payment of tax and eligibility for ITC are distinct compliance steps.
- Using invoice-entry date as the tax period. The statutory time-of-supply rules must be applied.
- Maintaining an old RCM list indefinitely. Rates, categories and conditions should be validated for the relevant period.
Practical takeaway
The safest way to manage GST reverse charge is as a controlled month-end process: identify a legally covered supply, determine the correct tax period, pay the liability in cash, test ITC independently and reconcile both sides to GSTR-3B. The enduring principle is simple, but transaction-specific notifications and rates can change, so the RCM master should always be supported by current official material rather than memory or an old checklist.
