For an Indian GST demand, calculate the tax, interest and penalty separately. The interest depends on the applicable rate, chargeable days and correct outstanding tax base; the penalty depends chiefly on whether the demand is under section 73 or section 74. Use the notice, payment records and relevant legal provisions to check each input before deciding whether to pay, appeal or seek a waiver.
What to check before calculating a GST demand
A demand notice or order may combine principal tax, interest and penalty, but those amounts arise under different provisions. Section 50 of the CGST Act governs interest; the demand section and the facts alleged govern the penalty analysis. The calculations below concern Indian GST, using the CGST Act as the main reference. Corresponding SGST or UTGST provisions may apply, and the IGST Act applies specified CGST provisions, including miscellaneous provisions, mutatis mutandis. Check the law applicable to the tax period and the current text before relying on a figure. CGST Act and IGST Act, as published by CBIC
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From the notice and your records, note:
- The tax period and the statutory due date for the tax.
- The tax head or heads involved: CGST, SGST/UTGST, IGST, or a combination.
- The alleged unpaid or short-paid tax, erroneous refund, or wrongly availed or utilised input tax credit (ITC).
- The section cited, the notice and order dates, and whether proceedings had begun before a return was filed.
- Payments already made, their dates and tax heads, and any amounts the order says were credited.
Do not treat the notice’s total demand as the interest principal without checking what that total includes. Separate tax from interest, penalty and other amounts, then reconcile the alleged tax balance against payment records.
How to calculate interest on a disputed tax demand
Choose the correct principal and interest rule
Section 50(1) provides for interest when tax or part of it is not paid within the prescribed period. Under section 50(2), the calculation runs from the day after the date the tax was due. The relevant rule depends on the circumstances: Rule 88B, for example, provides that for supplies declared in a return filed late, except where filing occurs after proceedings under section 73 or 74 have begun, interest is calculated on the portion of tax paid by debiting the electronic cash ledger for the delay period. Other cases must be classified under the applicable sub-rule; neither “the full demand” nor “cash paid” is the right base for every case. Notification No. 14/2022-Central Tax, which introduced Rule 88B
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Apply the rate for the relevant period
Use the rate legally applicable to the tax category and period in question, not a rate assumed from a calculator or another taxpayer’s demand. Section 50 sets a ceiling of 18% per annum under subsection (1), and a ceiling of 24% for the specific undue or excess ITC or output-tax-reduction situation covered by subsection (3). A ceiling is not proof that it is the operative notified rate for your case. The Act’s text gives the statutory framework; verify the rate notification and any amendments that apply to the relevant period. CGST Act, section 50
Calculate days and estimate the amount
For a stable outstanding principal and annual simple rate, an arithmetic estimate is:
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Interest = principal × annual rate × chargeable days ÷ 365
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For illustration only, a constant principal of ₹100,000 at an assumed annual rate of 18% for 60 chargeable days gives ₹100,000 × 0.18 × 60 ÷ 365 = about ₹2,959. The assumed rate is an arithmetic example, not a statement of the rate applicable to a GST demand.
How the demand section affects the penalty
Classify the demand using the section cited, the alleged conduct and the supporting facts. Penalty is not calculated by applying one percentage to every GST demand.
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| Demand route | What it covers | Penalty and payment-based closure |
|---|---|---|
| Section 73 | Tax not paid or short-paid, an erroneous refund, or wrongly availed or utilised ITC for reasons other than fraud, wilful misstatement or suppression of facts to evade tax. | Where liability is determined under subsection (9), the stated penalty is 10% of the tax or ₹10,000, whichever is higher, subject to the section’s terms. The section also provides payment routes that may conclude proceedings without the ordinary penalty; for example, subsection (8) addresses payment of tax and interest within 30 days of the show-cause notice. Eligibility depends on the case and applicable law. |
| Section 74 | The specified short-payment, refund or ITC issue is alleged to arise by reason of fraud, wilful misstatement or suppression of facts to evade tax. | The section provides a tax-equivalent penalty in its notice framework and reduced-penalty closure windows linked to payment, interest and the stage of proceedings. The applicable amount depends on the circumstances and the payment route available at that stage. |
The statutory wording and payment conditions matter; do not assume that a notice’s label alone establishes the facts or resolves whether section 73 or 74 applies. Review the allegations and evidence, and get advice if the classification is disputed. CGST Act, sections 73 and 74
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Check the first-appeal payment requirement
For a first appeal under section 107, the Act generally requires payment of amounts admitted from the impugned order and a pre-deposit tied to the remaining disputed tax. Section 107(6) specifies 10% of the disputed tax, subject to the applicable statutory maximum and wording. Once the required payment is made, recovery of the balance is deemed stayed while the appeal is pending. Confirm the current provision, applicable cap and treatment of the particular order, including whether it concerns tax or penalty alone. CGST Act, section 107
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Assess whether section 128A may apply
Section 128A can provide relief from interest or penalty for qualifying section 73 demands. CBIC Circular No. 238/32/2024-GST discusses conditions, including cases where tax has been fully paid but interest or penalty remains disputed. This is a conditional relief route, not an automatic waiver, and an application for waiver is distinct from an appeal challenging the original demand on its merits. Check the applicable tax period, payment and application requirements, deadline and your eligibility against the circular and current rules. CBIC Circular No. 238/32/2024-GST
Reconcile the amount before making payment
Compare the tax, interest and penalty figures in the notice or order with your own calculation and payment history. In particular, check the:
- tax period, due date and amount of tax treated as outstanding;
- interest base, rate, start and end dates, and any changes in the balance;
- section cited and the stated basis for the penalty;
- payments or credits already recorded, including their dates and tax heads.
CBIC’s payment rules describe the electronic cash ledger mechanism for paying interest, penalty, fees and other amounts. Reconcile your electronic liability register and cash ledger, and retain the challan and payment evidence. The rules do not establish exactly how a particular live demand will appear on the portal. GST Payment Rules
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