Kiwitax GST Calculator is a quick, easy calculator for working out New Zealand GST amounts at 15%. It adds GST to exclusive prices and removes GST from inclusive prices and more. A helpful app for small business owners or anyone wanting to calculate GST on the move.How to use: Enter any known figure in its text box, next press the button beside that text box.Outputs: The other two unknown GST figures are calculated.If you would like to discuss your small business and rental property accounting and tax please contact us. Talking with us is always free and we’re always happy to help!Talking with us is always free and we’re always happy to help!