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For an Indian GST demand, calculate tax, interest and penalty separately: first verify the demand and its legal basis, then identify the applicable interest rules and dates, and only then assess any penalty. The notice or order, tax period, payment history and whether the case proceeds under section 73 or section 74 can all change the amount.
What you need to check before calculating
Do not treat the total printed on a notice or order as the interest-bearing tax principal. Separate the alleged unpaid or short-paid tax from interest, penalty and any other amount, and check what the stated total includes.
Record the following from the notice, order and your GST payment records:
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- The tax period and the tax head: CGST, SGST/UTGST, IGST, or a combination.
- The tax amount alleged to be unpaid or short-paid, or the amount linked to an erroneous refund or wrongly availed or utilised input tax credit (ITC).
- The statutory section cited and the stated grounds for the demand.
- The due date for the tax, relevant notice and order dates, and dates of any payments or credits.
- Whether proceedings had begun before a return was filed late.
The CGST Act is the main reference for the provisions discussed here; the IGST Act applies specified CGST provisions, including miscellaneous provisions, mutatis mutandis. Check the law and applicable amendments for the tax period and demand involved. CGST Act and IGST Act.
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How to calculate interest on a GST demand
Section 50 deals with interest on delayed payment. Under section 50(2), interest is calculated from the day after the date the tax was due. The Act states that interest is calculated “from the day succeeding the day on which such tax was due to be paid.” The applicable Rule 88B branch determines how the base and period are worked out for the relevant circumstances. CGST Act and Notification No. 14/2022-Central Tax.
Choose the correct interest base
For supplies declared in a return filed after its due date, where the return is not filed after proceedings under section 73 or 74 have begun, Rule 88B provides for interest on the portion of tax paid by debiting the electronic cash ledger during the delay. Other situations require the applicable Rule 88B treatment; do not automatically calculate on either the full demand or only the cash-ledger portion without classifying the case.
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Reconcile the demand with amounts already paid or credited before choosing the outstanding base. If the amount changes during the period, calculate separately for each interval in which a different balance applies.
Count the chargeable period and use the applicable rate
For a stable principal and annual simple rate, an estimate is:
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Interest = principal × annual rate × chargeable days ÷ 365
This formula is an arithmetic aid, not a ruling on the legally correct principal, rate, day count or dates. Start from the day after the statutory due date, then account for the relevant payment dates and Rule 88B treatment. Verify the notified rate applicable to the tax category and period: section 50 sets an 18% ceiling under subsection (1), and a 24% ceiling under subsection (3) for the specified undue or excess ITC or output-tax-reduction situation. A statutory ceiling is not proof that the ceiling is the operative rate for your demand. CGST Act.
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Illustrative arithmetic only
If, purely for illustration, the applicable principal were ₹1,00,000, the assumed annual rate were 12%, and the chargeable period were 90 days, the formula gives ₹2,958.90: ₹1,00,000 × 0.12 × 90 ÷ 365. The assumed rate and inputs are examples, not a statement of the rate or amount applicable to any GST demand.
How section 73 and section 74 affect the penalty
Penalty is a separate question from interest. Identify the section cited and examine the grounds and evidence; the section used changes the penalty framework and the payment-based routes for concluding proceedings. CGST Act.
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| Demand route | When it applies | Penalty and payment framework |
|---|---|---|
| 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 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 windows that can conclude proceedings without the ordinary penalty; for example, subsection (8) addresses payment of tax and interest within 30 days of the show-cause notice. |
| Section 74 | The relevant tax, refund or ITC issue is alleged to arise by reason of fraud, wilful misstatement or suppression of facts to evade tax. | The section provides for a tax-equivalent penalty in its notice framework and reduced-penalty closure routes tied to payment, interest and the stage of proceedings. Check the exact statutory window and conditions applicable to the case. |
A notice’s use of a fraud-related label is not, by itself, a substitute for assessing the stated grounds and supporting evidence. Whether the section is properly invoked is a case-specific legal question, not something a calculator can resolve.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What to do if you dispute the demand
Recheck the principal, period, due date, payment credits, interest base, applicable rate and chargeable days against the demand and your records. Keep the issue with the tax amount distinct from disputes about interest or penalty; they may have different consequences and routes.
First appeal under section 107
For a first appeal under section 107, the Act requires payment of the amount admitted from the impugned order and a pre-deposit equal to 10% of the remaining disputed tax amount, subject to the applicable statutory maximum and wording. Once the required amount is paid, recovery of the balance is deemed stayed while the appeal is pending. Confirm the current provision and whether the order concerns tax, penalty alone or a special procedure before calculating the payment. CGST Act.
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Section 128A may offer relief from interest or penalty for qualifying section 73 demands. CBIC Circular 238/32/2024-GST discusses conditions, including cases in which tax has been fully paid but interest and/or penalty remains disputed. This route has specific period, payment, application and procedural requirements; it is not automatic. The circular also distinguishes a waiver application from an appeal challenging the original demand on its merits. Check eligibility, current rules and the relevant deadline before relying on this option. Circular No. 238/32/2024-GST.
Reconcile payments before relying on a figure
Compare the demand with the electronic liability register and cash ledger, and retain challans and other payment evidence. CBIC’s payment rules describe the electronic cash ledger mechanism for interest, penalty, fees and other amounts; they do not establish what a particular taxpayer’s live portal will display. GST Payment Rules.
Quick Recap
Which facts change the result?
| Decision or input | What to compare | Why it matters |
|---|---|---|
| Section 73 or 74 | Alleged reason, evidence, tax period and statutory wording. | The penalty provisions and payment windows differ. |
| Interest base | Cash-ledger payments, ITC, amounts already credited and whether proceedings had started. | Rule 88B treats circumstances differently. |
| Interest period | Statutory due date, the following day, payment dates and relevant intervening events. | Section 50 anchors the period, while the dates drive the arithmetic. |
| Pay, appeal or seek waiver | Amount admitted, disputed tax, order stage, filing deadline and section 128A eligibility. | Each route has different payment and procedural consequences. |
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