There are so many profits of the online tax calculator way of tax preparation for the year. After fill the necessary required information, the calculations are working with the full system. You do not need to go with the myriad of calculations working multiple of income from different sources, deductions, exemptions, and all. All the related work can be done online within the confines of your home or office within a matter of a few hours. Some sites also allow you to make comparisons with the past records of taxes filed.