About 55% of taxpayers are expected to e-file in 2006, up from 51% in 2005. But in 2005, 36 mln taxpayers (more than 25% of individual filers) prepared tax returns on a computer, printed them out and mailed them to the IRS. A mailed-in return costs $2.49 to process vs. 78 cents for one that’s e-filed.