A GST rate change does not automatically decide the tax on every purchase made near its effective date. For Indian GST, the applicable rate depends on the supply date and the invoice and payment dates under section 14 of the CGST Act. Once you establish the applicable rate and taxable value, the tax calculation is straightforward—but the arithmetic cannot tell you which rate applies.
Why a rate-change date does not settle the bill
When a GST rate changes, a transaction close to the effective date can have several relevant dates: when the goods or services were supplied, when the invoice was issued, and when payment was received. Section 14 of the Central Goods and Services Tax Act, 2017 sets out special time-of-supply rules for a change in rate. It overrides the ordinary time-of-supply rules in sections 12 and 13 for the rate-change situation.
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The rule is not simply “use the rate on the invoice date” or “use the rate on the payment date.” Section 14 separates supplies made before the change from supplies made after it, then matches invoice and payment timing to a statutory branch. The branch determines the time of supply used for the rate-change analysis; it is not a choice for the seller to make based on which rate produces a preferred bill.
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This guide concerns Indian GST and the CGST Act. It does not identify the correct rate for any particular product or service. To determine that, you also need the supply’s classification and the applicable rate notification in force for the relevant date. Do not assume a general example or a rate mentioned in an older explanation is current for your purchase.
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Work out which section 14 timing branch fits
First establish the effective date of the rate change and whether the supply occurred before or after it. Then compare the invoice date and payment date with that effective date. The table shows the timing patterns section 14 distinguishes and the time-of-supply outcome for each. Where the bank-credit proviso may affect the payment date, check the precise transaction facts against the statutory text.
| When the supply was made | Invoice timing | Payment timing | Time of supply under the section 14 branch |
|---|---|---|---|
| Before the rate change | After the change | After the change | The earlier of the invoice date and the payment date. |
| Before the rate change | Before the change | After the change | The invoice date. |
| Before the rate change | After the change | Before the change | The payment date. |
| After the rate change | After the change | After the change | The earlier of the invoice date and the payment date. |
| After the rate change | Before the change | After the change | The payment date. |
| After the rate change | After the change | Before the change | The invoice date. |
“Before” and “after” in this comparison are relative to the rate’s effective date. If an event falls on the effective date or the records leave the event’s timing unclear, do not guess which side of the change it belongs on; check the applicable notification and statutory wording for the transaction.
Check the payment date carefully
Section 14 includes a proviso for certain cases where the date of receipt of payment is the date the payment is credited to the supplier’s bank account. If that credit occurs more than four working days after the rate change, the Act specially treats the payment date. This can matter where the payment’s apparent or recorded date and its bank-credit date differ. Do not apply the four-working-day rule as a blanket extension or assume it changes every payment date: verify whether the proviso applies to the branch and facts at hand.
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For that reason, keep the payment evidence as well as the invoice. An instruction to transfer funds, a customer’s account debit, and a credit appearing in the supplier’s bank account may not all occur on the same day. Where the statutory proviso makes bank credit relevant, the actual credited date and the number of working days after the rate change matter; a generic “paid on” entry may not answer the question.
What the table does—and does not—answer
The table resolves the timing question only after the facts have been classified into the right branch. It does not establish whether a product or service is taxable, its classification, the rate notified for it, or its taxable value. Those must be determined independently before calculating the tax. The Central Board of Indirect Taxes and Customs (CBIC) FAQ offers historical illustrations of the timing logic, but an illustration is not a current rate schedule.
Think of the analysis as two separate decisions. First, determine the correct supply classification and the rate notification relevant to the transaction. Second, apply section 14 to decide which rate-change timing branch applies. Only after those decisions should you calculate tax on the taxable value. Keeping the questions separate helps prevent a correct calculation from lending false confidence to an incorrect rate assumption.
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A practical method for checking a transaction
Use this sequence for a bill, order, or service transaction that falls near a rate change. Keep the supporting records, especially where supply, invoicing, payment, or bank credit occurred on different dates.
- Confirm the applicable supply and rate. Identify the goods or services and their classification, then check the relevant current rate notification and its effective date. A general GST article cannot establish the rate for an unspecified item.
- Record when the supply took place. Establish whether the supply was before or after the effective date. This is the first split in section 14’s timing test.
- Record the invoice date. Use the date the invoice was issued, not merely the date it was received, viewed, or paid.
- Record payment timing. Establish whether payment was received before or after the effective date. If the bank-credit proviso could apply, check when the amount was credited to the supplier’s account and how many working days followed the rate change.
- Select the matching statutory branch. Compare the three dates against the table, then use the time-of-supply date assigned to that branch. Do not select a rate simply by looking at one date in isolation.
- Calculate tax after the rate is established. Apply the rate to the taxable value, then add the tax to that value to get the tax-inclusive total, assuming no other charges or adjustments.
- Compare the result with the document. Check that the invoice’s value, rate, and tax amount are consistent with the transaction and the applicable branch. If they are not, ask the supplier to explain the basis before treating the total as settled.
A useful way to organize the facts is to make a short timeline with the effective date as the dividing line. Put the supply date, invoice issue date, payment date, and any relevant bank-credit date on it. Then label each event as before or after the change and use the row matching that combination. This simple record can expose a mistaken assumption—for example, treating the invoice date as the only date that matters—before it affects the arithmetic.
Calculate the tax and total bill
Once the taxable value and applicable rate are known, the basic calculation is:
- Tax = taxable value × applicable rate ÷ 100
- Total = taxable value + tax
For example, if the taxable value is ₹1,000 and an assumed rate is 18%, the tax is ₹1,000 × 18 ÷ 100 = ₹180. The total is ₹1,000 + ₹180 = ₹1,180, before any other charges or adjustments. The 18% in this example is an arithmetic assumption only; it does not say that 18% applies to any particular good or service.
The calculation answers “how much tax follows from this value and rate?” It does not answer “what rate applies?” or “is this the correct taxable value?” A calculator can multiply numbers, but cannot resolve the classification, effective rate, supply timing, or section 14 branch. Determine those first; otherwise an accurately computed figure can still produce the wrong bill.
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When the final amount includes more than tax
The simple total above assumes there are no other charges or adjustments. If the invoice has additional line items, do not treat the example’s ₹1,180 as the expected final amount. Review the amounts and their treatment on the actual document rather than assuming that every invoice total is just taxable value plus the tax on one line.
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For a quick check, repeat the multiplication using the value and rate shown on the invoice, then compare the result with the tax amount printed there. If they differ, first check that you are comparing the same taxable value and the same rate, and consider whether there are other line items or adjustments. If the figures still do not reconcile, ask for an explanation rather than changing the assumed rate to make the bill match.
Inspect the invoice or bill of supply
CBIC’s invoice guidance identifies details used to understand and check a tax invoice, including supplier and recipient details where applicable, a unique invoice number and issue date, a description of the goods or services, value, tax rate, and tax amount. For a rate-change transaction, the invoice’s rate and tax amount are important, but they should be read alongside the supply, invoice, and payment records used in the timing test.
- Supplier and recipient information: Check the identifying details shown where applicable, so you are reviewing the document for the right parties.
- Invoice identity and date: Look for the invoice number and issue date. The date is one of the facts used in the section 14 analysis.
- Description and value: Confirm what was supplied and the value shown. A description that is too vague to identify the supply may make it harder to check classification and rate.
- Rate and tax amount: Compare the rate and tax amount with the applicable rate and the arithmetic on the taxable value. A matching multiplication alone does not prove the selected rate is correct.
A bill of supply is a different document. CBIC describes it for exempt supplies or supplies by a taxpayer under the composition scheme. It does not show a tax rate and tax charged in the way a tax invoice does, because tax cannot be collected in that context as tax on a tax invoice. If a document is labelled a bill of supply, do not expect it to provide a tax calculation in the same format as a tax invoice.
Check the type of document before looking for a tax line. A tax invoice is the document whose rate and tax amount you can compare with the calculation and timing analysis described here. A bill of supply serves a different context—exempt supplies or composition-scheme supplies—so the absence of a tax rate and tax charged on that document is not, by itself, a mismatch with a tax invoice format. If the document type is unclear, ask the issuer what kind of supply and document it represents.
How to interpret a bill when the rate changed nearby
Supply and invoice before the change, payment after
Do not conclude that the post-change rate applies merely because the customer paid after the effective date. For a supply before the change where the invoice was issued before it and payment followed it, section 14 assigns the invoice date as the time of supply. CBIC’s FAQ has a historical illustration in which services were provided and invoiced before the change, with payment afterward; the earlier rate applied in that example. Its figures illustrate timing, not a current rate for any service.
Supply before the change, with invoice and payment after
Where the supply was before the change but both invoice and payment came after it, section 14 uses whichever of the invoice date or payment date is earlier. The date the supply occurred still matters because it places the transaction in the pre-change set of branches.
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Supply after the change, with invoice before and payment after
For a supply after the change with an invoice issued before it and payment received after it, the section 14 branch assigns the payment date as the time of supply. If the bank-credit proviso is relevant, verify the credited date rather than relying only on a payment instruction or other date that may not be the legally relevant one.
Why seemingly similar bills can differ
Two customers can see different rate outcomes around the same effective date because their transactions may have different supply, invoice, or payment dates. Conversely, different-looking paperwork does not automatically prove that the rate is wrong. The useful comparison is factual: which side of the effective date each event falls on, which statutory branch matches, and whether the invoice’s rate and tax amount reflect that result.
For example, do not compare two bills only by their invoice dates. One transaction may involve a supply before the change and another a supply after it; even if their invoices look alike, those supply dates put them into different sets of section 14 branches. Likewise, two transactions with supplies before the change can take different branches if one was invoiced before the change and the other was invoiced afterward, or if their payments fall on different sides of the date. The relevant comparison is the complete timeline, not a single document field.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What to do if the invoice seems wrong
If the stated rate or tax amount does not appear to match the transaction, gather the facts before deciding the supplier made an error. A difference could stem from a mistaken date, a different description or classification, an incorrect effective rate, or a calculation issue. The source of the discrepancy matters because arithmetic correction alone will not repair an incorrect rate choice.
- Save the relevant records. Keep the invoice, order or service details, evidence of when supply occurred, payment record, and—if relevant—the bank-credit record.
- Check the rate notification and classification. Confirm that the rate used corresponds to the actual goods or services and the relevant effective date. Do not substitute a rate found in an old FAQ example.
- Reapply the section 14 test. Verify the pre-change or post-change supply category, then check invoice and payment timing against the corresponding branch.
- Recalculate independently. Multiply the taxable value by the established rate, then add the tax, accounting for other listed charges or adjustments separately.
- Ask the supplier to clarify the discrepancy. Identify the particular date, rate, value, or amount that appears inconsistent and request the basis for the invoice figures. A clear factual question is more useful than saying only that the new rate should or should not apply.
When contacting the supplier, make the question specific. You might ask which effective rate notification and classification were used, which section 14 timing branch was applied, or what date was treated as the payment date. If the amount is the issue, identify the taxable value and show the multiplication you performed. This gives the supplier a clear point to address and helps distinguish a timing dispute from a classification or arithmetic error.
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Use historical examples carefully
CBIC’s FAQ includes an illustrative rate increase from 18% to 20% effective 1 June 2017. Those numbers belong to a historical hypothetical used to explain timing. They are not evidence that a particular supply currently attracts either rate. Similarly, its example of services provided and invoiced before a change, with payment afterward, illustrates how the timing branch can work; it does not establish the treatment of every service transaction.
For an actual purchase, the transaction-specific answer requires the current classification and rate notification, the effective date, and the relevant supply, invoice, and payment facts. Treat the statutory timing rule, rate notification, and invoice arithmetic as separate checks: none can stand in for the others.
Frequently Asked Questions
Does the GST rate on my invoice date always apply?
No. Under section 14 of the CGST Act, the applicable time-of-supply branch depends on whether the supply was before or after the rate change and on invoice and payment timing. The invoice date alone does not decide every case.
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Once the applicable rate and taxable value are established, calculate tax as taxable value × rate ÷ 100, then add the tax to the taxable value for a basic total. For example, ₹1,000 at an assumed 18% gives ₹180 tax and ₹1,180 total, before other charges or adjustments. The example does not identify a current rate for any particular supply.
What if I paid after the rate changed but received an invoice before it?
The payment date alone does not settle the answer. If the supply and invoice were both before the change and payment followed, section 14 assigns the invoice date as the time of supply for that branch. Check the supply date and all transaction facts against the statute.
Does a bill of supply show GST charged?
A bill of supply is used for exempt supplies or supplies by a taxpayer under the composition scheme. CBIC describes it as a different document from a tax invoice; it does not show a tax rate and tax charged in the tax-invoice format.
Why might the bank-credit date matter?
Section 14 has a proviso for certain cases in which payment is treated as received when credited to the supplier’s bank account. Where the credit occurs more than four working days after the rate change, the Act specially treats the payment date. Verify whether the proviso applies to the branch and facts in your case.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchDoes CBIC’s 18% to 20% example tell me the current rate for my purchase?
No. CBIC’s FAQ uses those figures in a historical illustration effective 1 June 2017. To identify a current rate, confirm the actual supply’s classification and the applicable rate notification and effective date.
The Bottom Line
A nearby GST rate change does not mean the new rate automatically applies. Identify the supply, invoice and payment dates, match them to the correct section 14 branch, and verify the current rate notification for the actual goods or services. Then calculate tax from the established rate and taxable value, and compare the result with the invoice or bill of supply.
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