Payslip calculator This payslip calculator performs calculations for the 2017/18 tax year on a Month 1 basis. Gross Pay (£): The amount received before deductions. Is this pay weekly, or monthly? Weekly Monthly The payment frequency Tax code: The numeric element of the tax code. Please select an additional Tax Code (if applicable): None BR K D0 D1 NT Calculate Note: These calculations are only for illustrative purposes and are not a substitute for professional advice.