There are so may tax or income tax calculators available online helping people to calculate their TDS but for company purpose they need more advances tools that help them not in only calculating employees income tax liability but also their payroll, salaries, leavs, other salary deductions and allowances etc.
There so many HR and payroll software like
Saralpayroll is helping many companies to solve these matters easily by providing a user friendly software that works online and manage various complex process of HR or payroll