Problem Solvers Lab — Tools for Real Financial Events

Property & Cash-Flow Rights

Annuity IRR & Inflation CalculatorInvestments Bond Ladder & Goal MatcherInvestments RERA Delay Interest & Remedy CalculatorReal Estate

Tax Events & Reconciliation

Share Buyback Tax & Loss CalculatorTax MSME 43B(h) Disallowance CalculatorTax REIT / InvIT Distribution Tax CalculatorTax RSU/ESPP Foreign Shares Tax ReconcilerTax

Banking & Consumer Rights

Credit Report ₹100/Day CompensationBanking DICGC ₹5 Lakh Deposit Insurance CalculatorBanking Loan Prepayment Charge Rights CheckerBanking RBI Ombudsman 2026 Complaint CheckerBanking Unauthorised Transaction Liability CalculatorBanking UPI Failed Transaction Compensation CalculatorBanking

GST & Business Decisions

GST Rule 43 ITC Reversal CalculatorGST GST Rule 86B 1% Cash Payment CheckerGST

Insurance Analytics

Health Insurance Claim Deduction EstimatorInsurance Health Insurance Claim vs Self-Pay CalculatorInsurance Life Insurance XIRR & Surrender AnalyzerInsurance

How these differ from the standard calculators

The regular Finin2min calculators answer planning questions — what an EMI costs, what a SIP grows to, what tax a salary attracts. These answer a different question: a specific event has happened, what does the rule entitle you to, and by when. Where a Problem Solver overlaps a planning calculator, both are linked from each other rather than competing: the prepayment-rights checker sits alongside the loan prepayment calculator, and the health-claim deduction tool alongside the 80D deduction calculator.

Every page records the instrument it applies, the date the source was checked, and what it deliberately excludes. A source-check date is not a professional review.

Methodology, assumptions and sources

Scope: Computes interest on delayed GST tax payment under Section 50 of the CGST Act.

Calculation logic

Interest = Tax amount paid late × 18% per annum (or 24% per annum for the specific case of ITC wrongly availed and utilised, per the proviso) × (Number of days delayed ÷ 365).

Interest is computed on the net tax liability payable via the electronic cash ledger (after ITC set-off), consistent with the current interpretation of Section 50(1) as clarified by CBIC circular, from the day after the due date until the date of actual payment.

Where the case involves wrongly availed and utilised ITC, apply the higher 24% rate specifically to that portion, per Section 50(3), while the remaining (non-ITC-related) shortfall continues at 18%.

Inputs and assumptions

18%/24% rates follow the currently prescribed rates under Section 50 and its proviso; the 18% general rate applies to delayed payment of tax, while 24% is specific to wrongly availed and utilised ITC.

'Wrongly availed but not utilised' ITC (i.e., reversed before use) does not attract interest under the current framework, which the calculator reflects by asking the user to confirm whether the ITC was actually utilised.

Exclusions and edge cases

This is an estimation tool for planning purposes; the GST portal's own system-computed interest at the time of payment/return filing is the authoritative figure for actual liability.

Does not compute the separate late-filing fee under Section 47 — see the GST Late Fee Calculator or the combined Late Fee and Interest Estimator for that.

Sources

Review status: reviewed and approved by CA Nikhil Gupta on 19 July 2026.

Tools for when something has actually gone wrong