Services › Advanced+ Service Image 1 of 1 Advanced+ Service Sale Price: $50.00 Original Price: $75.00 Additional tax forms - $25.00 to $50.00 Per form.Previous year Amendments - $200-400 Depending on the errors and situation. Book Added! Additional tax forms - $25.00 to $50.00 Per form.Previous year Amendments - $200-400 Depending on the errors and situation.