No. The calculator is a generic device which is solely formatted to calculate repayments based on a pre-formatted and set formula. It calculates repayments based on the total loan amount entered for the loan term as entered, taking allowance for any balloon requested at the interest rate set. The interest rate is the current achievable rate by this lender based on certain loan applications. There is no allowance made for GST. If the loan amount entered is a GST inclusive price, then the repayments will cover the GST you are required to pay. Interest does not attract GST. How GST is claimable on a CHP finance contract will depend on the accounting method used by the business. GST will be applied to your car purchase, excluding rego, stamp duty if applicable and possibly other charges. How and when your business can claim the GST should be discussed with your accountant.