The IRS option Free File Fillable Forms has online forms that compute internal arithmetic and self-efile. This eliminates many hand math errors. However this s

The IRS option Free File Fillable Forms has online forms that compute internal arithmetic and self-efile. This eliminates many hand math errors. However this system isnt good at telling you which forms you need to file. You could miss an important one. For example sometimes you need a Schedule D and sometimes you dont. If you income reaches six figures you have to calculate the AMT and NIT forms to see whether they apply or not.