If your income last year was less than $57 thousand, file your federal taxes electronically for free with Free File.This year, 15 private tax preparation companies are participating in the Free File program. They all have different eligibility rules, so use this “wizard” to find the best one for you: http://apps.irs.gov/app/freeFile/jsp/wizard.jsp. Note: You may have to pay to file state income tax forms electronically. Those of any income level can use IRS-approved Free File fillable forms. Fill them in online, print them out and send them through the mail.