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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallIn India, don’t automatically replace the GST rate on every open invoice when a rate changes. Section 14 of the Central Goods and Services Tax (CGST) Act determines the time of supply using whether the supply happened before or after the change, along with invoice and payment dates. Work through those facts for each transaction, then decide whether the original invoice stands or a permitted credit or debit note is needed. The rule for choosing a rate is separate from checking the current rate for a particular crop, good or service.
Which GST rate applies when a rate changes?
For a supply that spans a rate change, the invoice date alone does not decide the applicable rate. Nor does the delivery date always decide it. Section 14 of India’s CGST Act sets special time-of-supply rules for these situations, notwithstanding the ordinary time-of-supply rules in sections 12 and 13. Its outcome depends on three dates: when the supply occurred, when the invoice was issued and when payment was received.
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First establish the effective date of the rate change. Then determine whether the supply took place before or after that date and whether the invoice and payment fell before or after it. Apply the section 14 timing rule to those facts; the legally relevant time of supply determines which rate applies. A changed rate does not, by itself, make every earlier invoice wrong.
Section 14 timing matrix
The table summarizes the statutory timing triggers. “Before” and “after” refer to the effective date of the rate change. In the payment column, use the Act’s definition of the date payment is received, explained below.
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| When the supply occurred | Invoice timing | Payment timing | Time of supply |
|---|---|---|---|
| Before the rate change | After the change | After the change | Earlier of the invoice issue date and payment receipt date |
| Before the rate change | Before the change | After the change | Invoice issue date |
| Before the rate change | After the change | Before the change | Payment receipt date |
| After the rate change | After the change | Before the change | Later of the invoice issue date and payment receipt date |
| After the rate change | Before the change | After the change | Payment receipt date |
| After the rate change | After the change | Before the change | Invoice issue date |
The last two rows can look counterintuitive. For a supply after the change, an invoice issued before the change with payment received after it points to payment receipt as the time of supply. Where both invoice and payment are before the change for a post-change supply, the statutory combination is invoice after the change/payment before it—not both before; confirm the facts and apply the specific statutory clauses rather than forcing an incomplete scenario into a table shorthand. If timing facts do not fit a row cleanly, consult the operative text and a qualified GST adviser before changing tax charged.
For statutory payment timing, the date of receipt is generally the earlier of the date the payment is entered in the supplier’s books and the date it is credited to the supplier’s bank account. Section 14 includes a four-working-day proviso tied to the rate-change date: where the bank account is credited after four working days from that date, the date of credit to the bank account is treated as the date of receipt. Keep the bank record and books entry so the date used can be verified.
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A practical process for reviewing an affected invoice
- Identify the supply and the rate-change date. Establish what was supplied, when the supply legally occurred, and the effective date specified for the rate change. Separate supplies or deliveries where the underlying facts differ; do not assume that all invoices raised around the same date have the same treatment.
- Record the invoice date. Use the date the invoice was actually issued, not an edited date or an internal draft date. Retain the original invoice and its issue details.
- Establish the payment receipt date. Compare the books-entry date with the bank-credit date under the statutory definition, including the four-working-day proviso. Preserve the relevant ledger and bank evidence.
- Apply section 14 to the combination. Identify whether the supply was before or after the effective change, then use the matching invoice/payment combination to determine time of supply.
- Check the rate for the actual item or service. Once timing is established, verify the applicable rate and classification against current CBIC notifications and rate materials. The rate-change rule does not establish the current rate for a particular crop, processed product, input or service.
- Choose the correct document treatment. If the original invoice already reflects the applicable rate and amount, preserve it rather than rewriting it. If the issued invoice requires a qualifying adjustment, assess whether a credit or debit note is permitted. For an exempt or composition-scheme supply, use the applicable bill-of-supply treatment rather than charging tax on a tax invoice.
- Report and retain the adjustment. Report a note under the current return rules and retain its connection to the original invoice, the reason for adjustment and the supporting records. Check the operative law and rules for applicable time limits.
When to issue a credit note or debit note
A rate change does not automatically require a new invoice or a note. The document depends on whether the original tax and taxable value were too high or too low, whether the supply is taxable, and whether the law permits that adjustment. Section 34 governs credit and debit notes for qualifying invoice adjustments. Do not silently overwrite or delete an issued invoice to make its tax appear consistent with a later rate.
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|---|---|---|
| Tax or taxable value is higher than it should be | A credit note may be appropriate if the adjustment qualifies under section 34 | Confirm the legal basis, current time limit and return treatment |
| Tax or taxable value is lower than it should be | A debit note may be appropriate for a qualifying shortfall | Confirm the corrected value, tax and reporting treatment |
| Original invoice already has the correct treatment | No rate-driven rewrite is needed | Keep the original record and evidence supporting the time-of-supply decision |
| Supply is exempt or covered by composition treatment | Use a bill of supply as required, not a tax invoice showing GST charged | Confirm the supplier’s status and the nature of the particular supply |
A credit or debit note should be a traceable adjustment, not a replacement invoice with no audit trail. The prescribed particulars include the nature of the document, a unique serial number and date, supplier and recipient details, a reference to the corresponding invoice, taxable value, tax rate, tax amount credited or debited, and signature or digital signature where required. Keep a clear reason for the adjustment with the supporting records. Apply the relevant invoice and note rules and exceptions to the specific document.
Section 34’s deadline wording requires particular care. The current CBIC text shows an amendment effective 1 October 2025 and also marks a further inserted provision as not yet notified. Because wording and commencement status affect whether a note can adjust tax, check the operative statute and applicable notifications at the time of the adjustment rather than relying on an older article or a deadline repeated from a portal guide. The GST Portal’s GSTR-1 guide says credit notes are reported in the return for the month of issue, but its deadline wording should not substitute for checking the latest operative Act and rules.
What should an invoice or adjustment document contain?
For taxable goods, section 31 generally requires a registered supplier to issue a tax invoice before or at removal when the supply involves movement, or before or at delivery or making the goods available in other cases. The invoice must carry the prescribed information. Review the applicable rules and exceptions for your transaction rather than treating this list as a substitute for them.
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- Supplier information, including the supplier’s GSTIN, and the invoice’s unique serial number for the financial year and issue date.
- Recipient details where applicable; description and HSN of the goods; and quantity.
- Total and taxable values, the applicable tax rate and amount, and the place of supply for an inter-State supply.
- Delivery address where relevant, the reverse-charge indicator where applicable, and signature or digital signature subject to the rules and exceptions.
For a credit or debit note, include the required particulars and refer it to the original invoice. The original invoice remains part of the transaction record; the note documents the permitted adjustment. Preserve both documents and the working that explains why the amount changed.
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Repair Windows errors before they cause bigger problemsFix Now →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Does GST apply to farm produce?
There is no single GST answer for every agricultural business or every farm-related transaction. A person’s registration position, the particular supply and the activity involved all matter. The CGST Act’s agriculturist provision covers an individual or Hindu Undivided Family who cultivates land personally or through family or labour, and says that person is not liable to registration to the extent of supplying produce out of that cultivation. That does not mean every business connected with farming is exempt, or that every farmer must register.
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A business registered for other activities should still classify each transaction. Farm produce, processing, trading, agricultural services and other activities may receive different treatment. Exempt supplies and supplies made under the composition scheme generally call for a bill of supply rather than a tax invoice showing tax charged. Confirm whether the person and the specific supply meet the relevant conditions.
CBIC’s FAQ gives raw cotton under the cited classification as an example of a supply taxed on reverse charge when a registered buyer purchases from a farmer who is not liable to register. It is a specific example, not a rule for all crops or all purchases from farmers. Check the current notification and classification for the exact goods, supplier and transaction.
Common mistakes to avoid
- Changing every open invoice to the new rate. First determine time of supply under section 14; an invoice can remain correct even if the rate changes before payment or after invoicing.
- Using the invoice date as the only test. Supply timing and payment timing also matter, and the Act defines the payment receipt date.
- Assuming a crop is exempt because it is agricultural. Establish the supplier’s status and classify the actual goods or service against current rules.
- Replacing the original record without a note or trail. Keep the issued invoice and use a permitted, linked adjustment document where appropriate.
- Relying on a remembered rate or deadline. Verify the current commodity-specific CBIC rate notification and the operative section 34 deadline and return rules.
Records to keep for an audit trail
For each invoice affected by a rate change, retain the original invoice, evidence of the supply date, the applicable rate-change notification or effective date, the books and bank records used to establish payment receipt, and the calculation applying section 14. If you issue a note, keep its unique number, date, reference to the original invoice, reason and supporting evidence, along with the return reporting. These records make it possible to explain not merely which rate was used, but why that rate applied to that transaction.
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