Calculators Company car tax The tax you pay on your company car is based on the CO2 emissions of the car. This calculator will calculate your tax exposure on your company car. VAT This calculator will calculate the VAT that has been paid or will be paid on amounts entered. Payslip Check to see if you are having the correct amount of tax and NI deducted from your salary. Profit analyser This calculator will help you to forecast how your business performance will be affected by changes in key areas. Loan This calculator will help you check how much interest you will pay on a loan. Savings Calculate how your savings will grow. Stamp duty Calculate the stamp duty land tax charged for the purchase of property or stamp duty on transfer of shares on or after 6 April 2013. Gross profit margin Calculate your Gross Profit Margin.