How to calculate GST interest on late payment?

Asked by: Nia Grant  |  Last update: October 16, 2026
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GST interest on late payment is calculated at 18% per annum on the net cash tax liability, applied from the day after the due date until the actual payment date. The formula is: Interest = Tax Liability × 18 % 365 × Number of Days Delayed I n t e r e s t = T a x L i a b i l i t y × 1 8 % 3 6 5 × N u m b e r o f D a y s D e l a y e d . Interest is only paid on cash payments, not ITC.

What is the formula to calculate interest on late payments?

Use the following formula to determine the amount of interest due: (# of days late ÷ 365) x (applicable prompt payment interest rate) x (amount of payment) = (interest due).

What is the interest on late GST payments?

Penalty for Late Tax Filing of GST/HST Returns

If you have an amount owing for the GST/HST return, the late filing fee is 1% of the amount owing plus 25% times the number of full months the return is overdue. This accumulates up to the maximum of 12 months.

Is GST applicable on interest on late payments?

Yes, GST is applicable on interest charged for delayed payments, as it is considered part of the transaction value under GST law. The interest amount is subject to the same GST rate as the supply of goods or services.

Does late payment interest include GST?

Late payment and finance charges (monthly interest) are exempt from GST. Are cash advance fees subject to GST? No, they are exempt from GST.

Calculating Late Payment Interest And Fees In GST with Example

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How is GST late payment calculated?

Example Calculation: A taxpayer has an outstanding GST liability of ₹50,000 and delays payment by 30 days. The interest rate applicable is 18% per annum. So, the taxpayer must pay ₹50,739.72 to clear the GST dues.

Is there GST on late payment interest?

Where the late payment penalty is consideration for a financial supply (for example, a supply of an interest in a credit arrangement), there is no need for the supplier to account for GST for that supply. A charge for late payment penalty that is consideration for a financial supply is not an adjustment event.

How to pay interest on late payment of GST in GST portal?

Login to GST Portal and select the option - Services - Then select - Payment. Select Create Challan and window will be opened showing tax particulars, interest, penalty and fees details. Select Penalty and pay the same according to category - CGST, SGST or IGST.

How to calculate interest on late invoice payment?

Calculate the statutory rate: Add 8% to the Bank of England base rate. Work out the daily rate: Divide the total percentage by 365 to get a daily interest rate. Calculate the interest: Multiply the overdue amount by the daily rate, then multiply by the number of days the payment is late.

How to calculate interest on late tax payment?

The IRS charges 0.5% of your unpaid taxes for each month or part of a month that your taxes remain unpaid. The failure to pay penalty has a maximum charge of 25% of your unpaid taxes. Be sure to pay your taxes within 10 days of the failure to pay notice. After 10 days, the penalty charge increases to 1%.

How is interest calculated on delayed payment of tax?

Interest on late income tax payments is calculated under Sections 234A, 234B, and 234C at 1% per month or part thereof on the unpaid tax amount. The interest period varies based on the delay—either from the return filing due date or from when advance tax was due. Timely payments help avoid additional charges.

What happens if I miss the GST payment due date?

Interest on Late Payment of GST:

If the taxpayer is unable to pay GST on time due to some reason, an interest is charged on the GST payment. An interest on late payment of GST is of 18% per annum and will be charged for the days after the due date.

Is interest on late payment of GST is allowable expenditure?

GST Interest: - Interest is charged under GST for late deposition of GST. It is also an allowable expense as it is compensatory in nature. GST Penalty: - There are certain penalties imposed under GST Act such as penalties under Section 122, 123, 125 and are penal in nature.

How to calculate interest calculator?

To calculate interest rates, use the formula: Interest = Principal × Rate × Tenure. This equation helps determine the interest rate on investments or loans.

What is the formula to calculate interest?

Interest calculation uses different formulas for simple interest (I=Prtcap I equals cap P r t𝐼=𝑃𝑟𝑡) and compound interest (A=P(1+r/n)ntcap A equals cap P open paren 1 plus r / n close paren raised to the n t power𝐴=𝑃(1+𝑟/𝑛)𝑛𝑡), where Pcap P𝑃 is principal, rr𝑟 is the decimal interest rate, tt𝑡 is time, Icap I𝐼 is interest, Acap A𝐴 is the final amount, nn𝑛 is compounding frequency, and you convert percentages to decimals by dividing by 100 before using the formula.
 

How do we calculate interest payments?

The formula for calculating simple interest is SI = (Principal × Rate × Time) / 100, where the principal refers to the initial amount of money, the rate represents the annual interest rate in percentage, and the time indicates the period for which the money is borrowed or invested, expressed in years.

How to calculate interest due on a late payment?

To calculate the interest due on a late payment, the amount of the debt should be multiplied by the number of days for which the payment is late, multiplied by daily late payment interest rate in operation on the date the payment became overdue.

What is the interest rate for late payment of invoices?

The standard amount for late payment interest on invoices is between 1% and 2%, but you can charge more or less at your discretion. Include this information on your contracts and invoices to ensure clear communication and legal obligation.

What is the formula for overdue calculation in Excel?

=DAYS(D2, C2)

➤ Here, C2 contains the due date and D2 contains the date up to which you want to count the overdue dates. Change the cell references according to your dataset. ➤ Press Enter and apply the formula to the remaining cells using the fill handle.

How to waive GST late fee?

1. Login into GST portal: Navigate to > Services > User Services > My Applications. 2. On Navigating to 'My Applications' page, the taxpayer has to select 'Apply for Waiver Scheme under Section 128A' option under 'Application type' dropdown.

What is the penalty for filing GST late?

Late filing penalties for goods and services tax (GST)

There is a late filing penalty of $50 if you're on the payments basis. There is a $250 penalty for late filing on the hybrid or invoice basis. These penalties are usually due on the 28th day of the month after the return was due.

What is PMT 09 in GST?

Thus, a registered or unregistered taxpayer can file Form GST PMT-09 for transfer of any amount of tax, interest, penalty, fee or others, under one (major or minor) head to another (major or minor) head, as available in the Electronic Cash Ledger.

Is GST applicable on late payment interest?

Hence, it is apparent that interest received from a customer for late payment of an invoice is liable to GST. The same should also be disclosed in the GST Returns when the supply of goods or services for which such interest was charged.

How is interest calculated on late tax payments?

Generally, interest accrues on any unpaid tax from the due date of the return (without any extensions) until the date of payment in full. The interest rate is determined quarterly and is the federal short-term rate plus 3 percent. Interest compounds daily.

How to pay interest on late payment of GST under section 50?

Interest is paid on GST liability deposited late on the unpaid tax at 18% p.a. for the period on the tax amount or any part that remains unpaid. Further, an assessee who makes: Delay in depositing GST. Makes short payment of GST.