How to calculate GST Interest

This discussion explains how to calculate Goods and Services Tax (GST) interest when there's a delay in filing monthly returns. The interest is charged at 18% per annum on the gross tax liability, calculated from the day after the due date until the actual payment date. While the GST portal doesn't automatically calculate this, you'll need to work it out manually using the provided formula: (Gross tax liability x 18%) / 365 x Number of days of delay. An amendment is expected to allow interest calculation on net tax liability soon.