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Reverse charge mechanism (RCM) changes who pays GST. For a supply covered by the relevant provision and current notification, the recipient—not the supplier—accounts for the tax to the government. The recipient must identify the legal basis, calculate the correct tax, pay it (normally through the electronic cash ledger), retain the prescribed records, report the liability and then assess input tax credit (ITC) separately. RCM is not a blanket rule for every purchase from an unregistered supplier; coverage is transaction-specific and must be checked against current law and notifications.
What is meant by Reverse Charge?
India’s Central Goods and Services Tax framework normally puts GST collection on the supplier. Under reverse charge, that responsibility shifts to the recipient for specified, notified categories of supplies. The Central Board of Indirect Taxes and Customs (CBIC) describes it this way in its Sectoral FAQs: “It means the liability to pay tax is on the recipient of supply of goods or services instead of the supplier of such goods or services in respect of notified categories of supply.”
Both goods and services can fall within RCM. The mechanism is therefore not a services-only rule, and it cannot be applied merely because a vendor is small, unregistered or unable to charge GST. A current statutory provision and notification must cover the particular transaction. The applicable treatment can also depend on whether the supply is intra-State or inter-State, the place of supply, and the status of the parties.
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When does RCM apply?
Start with the legal basis, not with the vendor’s invoice. The CGST Act and related notifications identify categories for which the recipient is liable. Because categories, exemptions, rates and effective dates can change, check the current notification that covers the supply and the relevant tax period. CBIC’s general FAQ material includes older discussion of purchases from unregistered suppliers; that language should not be read as proof that every such purchase currently attracts RCM. Section 9(4) has been changed and limited over time, so an unregistered supplier by itself is not a sufficient test.
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- Identify the supply: describe exactly what was supplied, where it was supplied and when.
- Check the parties: establish the supplier’s and recipient’s registration status and the recipient’s role in the transaction.
- Locate the current authority: match the transaction to the applicable Act provision, notification, exemption or special rule.
- Confirm tax type: determine whether CGST and SGST or IGST applies, rather than assuming a generic GST rate.
No single short list is safe for every period or State. If the notification basis cannot be identified, pause the calculation and obtain current professional advice before treating the purchase as RCM.
Reverse charge versus ordinary (forward-charge) GST
| Question | Forward charge | Reverse charge |
|---|---|---|
| Who is liable to pay GST? | The supplier charges and remits GST, subject to normal rules. | The recipient remits GST when the supply is covered by the RCM provision or notification. |
| What establishes liability? | The ordinary taxable-supply rules and the supplier’s obligation. | A transaction-specific statutory or notification basis; it is not automatic for every unregistered purchase. |
| How is the tax funded? | The supplier collects it from the customer and pays it over. | The recipient pays the RCM amount through the prescribed cash mechanism; eligible ITC is considered only afterward. |
| Can the recipient claim ITC? | Potentially, if normal ITC conditions and restrictions are met. | Potentially, after discharging RCM and meeting the same independent eligibility tests. RCM status alone does not guarantee credit. |
| What records matter? | Purchase and tax-invoice records and the recipient’s ITC evidence. | Those records plus the RCM calculation, cash payment, return reporting and any prescribed receipt or payment voucher. |
The recipient’s six-step RCM workflow
1. Classify the transaction
Capture the supplier, recipient, registration numbers, description of goods or services, invoice or voucher date, place of supply, delivery or receipt date and consideration. Determine whether the recipient is acting in the course or furtherance of business. These facts drive the place-of-supply, tax-type and ITC analysis.
Then match the facts to the current RCM entry. Keep a copy or reliable reference to the notification and its effective date in the transaction file. If an exemption, threshold or special recipient rule applies, document that conclusion as well. Do not use a general “vendor unregistered” flag as a substitute for this check.
2. Establish value, rate and tax type
RCM changes the payer, not the method for determining taxable value. Establish the value under the applicable valuation rules and identify the rate and levy that apply to that supply. The correct result may involve CGST plus SGST/UTGST for an intra-State supply or IGST for an inter-State supply. A generic RCM definition does not provide a rate, exemption or threshold.
Reconcile the amount to the underlying contract, invoice, debit or credit note and any advances or adjustments. If the supplier’s document is incomplete, obtain the transaction evidence needed to support the recipient’s self-assessment and voucher records.
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3. Determine the time of supply
Time of supply determines the period in which the recipient’s liability belongs. CBIC’s FAQ describes separate tests for goods and services, using events such as receipt, payment and the age of the supplier’s invoice. Special provisions can alter those tests. The FAQ is not a substitute for the current statute, so verify the applicable rule before assigning a due period or return.
- For goods, examine the receipt and payment events and the relevant invoice trigger under the current rule.
- For services, examine payment, receipt and invoice-related triggers and any special timing provision.
- For advances, debit notes, credit notes or continuing supplies, check whether a separate rule changes the liability period.
Maintain a dated working paper showing which event fixed the time of supply and why the liability was included in that tax period.
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CBIC’s explanatory flier states that reverse-charge liability is discharged by debiting the electronic cash ledger; it cannot be paid with available ITC. This creates an important sequence: fund and pay the RCM tax first, then evaluate whether the amount can be claimed as credit. Confirm the live portal procedure and payment references for the relevant period, particularly where interest or a correction is involved.
Retain the challan, cash-ledger debit and accounting entry together with the calculation. A credit balance in the electronic credit ledger does not replace the cash-payment requirement for the RCM liability.
5. Record and report the inward supply
Report the liability in the appropriate return fields for the period determined by the time-of-supply rule. The CBIC GSTR-3B form material separates inward supplies liable to RCM from the eligible ITC line for inward RCM supplies. Portal labels and instructions can change, and the surfaced form copy is older, so use the live GSTR-3B instructions for the tax period rather than copying an old field number.
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Reconcile three totals before filing:
- the RCM amount in the transaction register;
- the amount actually paid through the electronic cash ledger; and
- the liability and any credit reported in the return.
Investigate differences before filing. A liability reported without cash payment, or credit claimed without a corresponding eligible liability and documents, can produce an avoidable mismatch.
6. Assess ITC independently
CBIC states that “input tax” includes tax payable under reverse charge. That means RCM tax can be input tax, but it is not an automatic credit. Apply the ordinary ITC conditions and restrictions: the supply must be received for business purposes, the required document and tax payment evidence must exist, and blocked-credit, exempt-use and non-business-use rules must be considered. Check the current section 16 provisions and any later amendments before claiming.
The normal 180-day condition for paying the supplier for a supply does not apply where tax is payable under RCM, according to CBIC’s FAQ and the statutory proviso. That exception concerns payment to the supplier; it does not remove the other ITC conditions or the need to pay the RCM tax to the government.
What records must be kept?
CBIC’s accounts-and-records rules require a registered person to maintain a true and correct account of supplies attracting RCM and the related documents. Build a file that lets an auditor trace the transaction from source document to tax calculation, cash payment, return and credit claim.
- Supplier and recipient details, including registration status and tax identification.
- Purchase invoices, bills of supply and any self-issued or recipient-issued document required for the transaction.
- Delivery challans, goods-receipt evidence, service completion evidence and contracts or purchase orders.
- Credit notes, debit notes, receipt vouchers and payment vouchers where applicable.
- E-way bills and transport evidence when relevant to the goods movement.
- The RCM classification memo, notification reference, taxable value, rate, tax type and calculation.
- Accounts of tax payable and tax paid, electronic cash-ledger evidence and return acknowledgements.
- ITC claimed, reversals or adjustments and the business-use analysis supporting eligibility.
Use consistent identifiers—purchase order, invoice, voucher and return period—so the same supply is not omitted or counted twice. Retain electronic records in an accessible, tamper-evident format with a backup and an audit trail for changes.
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Invoice and voucher details
CBIC’s invoice rules list whether tax is payable on reverse charge as an invoice detail. The document used will depend on the transaction and the applicable rule; do not assume the supplier always issues the same type of tax invoice. Where the recipient must issue a receipt or payment voucher, retain it with the supplier’s document and proof of payment.
Before accepting a document, check that it identifies the parties, describes the supply, shows the relevant dates and values, and indicates the reverse-charge treatment where required. Correct a missing or contradictory document promptly and preserve the original and replacement trail.
Illustrative accounting sequence
Assume a company identifies a service as a covered RCM supply after checking the current notification. The company should first record the service cost and the amount payable to the supplier. It then calculates the applicable GST, records an RCM liability, pays that liability through the electronic cash ledger and reports it in the RCM section of the return. Only after payment does it test whether the same tax qualifies for ITC; if the service is partly exempt or personal, the eligible credit may be reduced or blocked. The example demonstrates the order of actions, not a rate, threshold or category determination.
Common mistakes and how to correct them
Assuming every unregistered purchase is RCM
Recheck the current section 9(4) position and the notification for the specific supply. If no current basis covers it, do not create an RCM liability solely from the supplier’s registration status.
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Reverse the attempted set-off and pay the liability through the electronic cash ledger as required. Preserve the correction and check whether interest or an amended return is necessary under the current rules.
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Claiming credit at the same time as—or before—payment
Separate the cash-payment evidence from the ITC working paper. Claim only after the liability is discharged and all ordinary conditions are satisfied.
Copying an old return field or deadline
Use the live GSTR-3B instructions and portal for the applicable period. Keep a dated copy of the instructions used for the filing.
Ignoring place of supply or tax type
Reperform the intra-State versus inter-State analysis and correct CGST/SGST/UTGST or IGST classification before filing. A correct RCM concept with the wrong levy is still an error.
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Keeping only the supplier invoice
Add the notification basis, calculation, cash payment, return evidence and ITC eligibility analysis. The invoice alone does not prove that the recipient completed its RCM obligations.
Practical RCM checklist
- Describe the supply and collect supplier, recipient, date, place and value facts.
- Locate and save the current statutory provision and notification covering—or excluding—the transaction.
- Determine taxable value, rate, exemption and CGST/SGST/IGST treatment.
- Apply the current goods or services time-of-supply rule and assign the tax period.
- Prepare the required invoice, receipt voucher or payment voucher and mark reverse-charge treatment where required.
- Record the liability and pay it through the electronic cash ledger.
- Report the inward RCM liability and any eligible ITC in the live return fields.
- Reconcile the register, cash payment, return and credit claim; retain the complete document trail.
Because notifications, rates, forms and statutory provisions are amended, this checklist is a control sequence rather than a substitute for checking the law in force on the transaction date. For a disputed classification, unusual supply or material amount, obtain advice based on the actual facts before filing.
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