Short description of Tax Assistant for Excel 4.4: Tax Assistant for Excel is a custom application written for Microsoft Excel and requires Microsoft Excel 97/2000/XP/2003/2007 or higher. It simplifies your Federal Income Tax preparation by providing Excel workbooks with IRS approved substitute forms for both Form 1040 and Form 1040A and related Schedules. Even if you use another tax package, Tax Assistant provides a permanent copy of your tax return in the universal common Excel file format.