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Tax calculator

GST Interest Calculator

Calculate GST interest from due date to payment date for delayed tax or ITC-related scenarios.

Professional calculator

GST Interest Calculator

Calculate GST interest from due date to actual payment date using the statutory simple-interest method.

Estimated result

Delay days

30 days

Estimated interest

₹740

Tax plus interest

₹50,740

Detailed breakdown

Principal tax amount₹50,000
Due date2026-04-20
Actual payment date2026-05-20
ScenarioDelayed tax payment
Annual rate used18%
Delay days30

Formula and assumptions

Interest = Tax × annual rate × delay days ÷ 365.

  • CGST Act Section 50 uses interest for delayed tax; wrongly availed/utilised ITC can attract a higher notified rate.
  • Interest period and rate should be verified for the exact facts, notices and payment type.
  • Payment on or before due date gives zero delay days in this estimator.
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