GST Interest Calculator

Calculate GST interest from the outstanding tax, annual rate and delay. Enter your own values below to see simple interest and check the method behind it.

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Your inputs

Change the example values to match your situation.

Your result

Let’s work it out.

Fill in your inputs and select Calculate.
Your result and breakdown will appear here.

How this calculator works

Interest = tax × annual rate / 100 × delay days / 365.

Before you use the result

  • Select the correct interest-bearing liability and notified rate for the case.

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What is GST Interest Calculator?

GST Interest Calculator helps you calculate GST interest from the outstanding tax, annual rate and delay.

The main result is simple interest. The formula, example and assumptions below explain how to interpret it.

How to use GST Interest Calculator

Use the example to get familiar with the form, then enter your own figures. Any rates in the example are illustrative. Check the field labels and units before calculating.

  1. Gather tax subject to interest (₹), applicable annual interest rate (%) and days of delay. Use values from the same situation or reporting period.
  2. Replace the example tax subject to interest with your own value, then complete the other fields. Check the displayed units.
  3. Select Calculate and read simple interest. Change one input and calculate again to compare a second scenario. Reset restores the original example.
  • Enter tax subject to interest in ₹, at least 0. Decimals are accepted.
  • Enter applicable annual interest rate in %, at least 0 and at most 100. Decimals are accepted.
  • Enter days of delay, at least 0 and at most 100000. Use a whole number.

GST Interest Calculator: a worked example

With the inputs below, the result is ₹147.95 (simple interest). Follow the example, then replace these illustrative values with your own.

Example inputs and output
Input or outputExample value
Tax subject to interest (₹)₹10,000
Applicable annual interest rate (%)18 %
Days of delay30
Simple interest₹147.95

Understanding the GST Interest result

The main output is simple interest, expressed in ₹. It applies to the inputs and operation you selected.

Displayed results use a readable number of decimal places. When checking a result by hand, keep extra precision until the last step. To compare scenarios, change one input at a time and keep the others fixed.

GST Interest Calculator: assumptions and common mistakes

A useful estimate starts with the right inputs. Check the following assumptions and limits before applying the result to your situation.

  • Select the correct interest-bearing liability and notified rate for the case.
  • Use the rate and eligibility rules that apply to your transaction. An example rate does not establish a tax liability or entitlement.

For wider guidance, visit Income Tax Department. The formula and scope of this specific tool are stated on this page.

GST Interest Calculator FAQs

What does GST Interest Calculator calculate?

GST Interest Calculator helps you calculate GST interest from the outstanding tax, annual rate and delay. Its main output is simple interest in ₹.

What inputs do I need for GST Interest Calculator?

You need tax subject to interest (₹), applicable annual interest rate (%) and days of delay. Use the field labels and units to match your figures to the formula.

Which formula does GST Interest Calculator use?

Interest = tax × annual rate / 100 × delay days / 365.

What is a worked example for GST Interest Calculator?

Example inputs: Tax subject to interest: ₹10,000; Applicable annual interest rate: 18 %; Days of delay: 30. The result is ₹147.95 (simple interest).

How should I enter tax subject to interest?

Enter tax subject to interest in ₹, at least 0. Decimals are accepted.

How do I choose applicable annual interest rate?

Enter applicable annual interest rate in %, at least 0 and at most 100. Decimals are accepted. The example uses 18 %; replace it if your circumstances differ.

How should I read simple interest?

The main output is simple interest, expressed in ₹. It applies to the inputs and operation you selected.

Why might my GST Interest Calculator result differ from my records?

Select the correct interest-bearing liability and notified rate for the case. Differences in entered values, units or rounding can also change the comparison.

Can I compare two scenarios in GST Interest Calculator?

Yes. Note your first simple interest, change tax subject to interest or another input, and select Calculate again. Editing a field clears the old result so it is not mistaken for a new calculation.

Is GST Interest Calculator free, and where are my inputs calculated?

This calculator is free to use without signing in. Its formula runs in your browser; calculator inputs are not sent to a calculation API. The inputs reset to the example values when you reset the form or start a fresh page.