1. TurboTax
TurboTax Is The #1-Rated, Best-Selling Tax Software. The Free Edition Includes Free IRS eFile. Easily Prepare Your Tax Return and File Income Taxes Online. Choose Easy.
http://turbotax.intuit.com

2. IRS e-file: Filing your taxes online was never easier!
Your Electronic Alternatives to Filing Paper Returns
http://www.irs.gov/efile

3. Income Tax Software - Prepare Taxes Online - TaxCut by H&R Block
Prepare Taxes Online - TaxCut by H&R Block
http://www.taxcut.com

4. H&R Block | Online Taxes
H&R Block Online tax preparation
http://www.hrblock.com/taxes/products/product.jsp~

5. Federal And State Tax Preparation at CompleteTax.com: Income Tax Preparation, Online Tax Services, Professional Tax Services, Tax Filing Services
Federal And State Tax Preparation at CompleteTax.com. Specializing in Income Tax Preparation, Online Tax Services, Professional Tax Services, and Tax Filing Services
http://www.completetax.com

6. TaxBrain
Online income tax preparation service from TaxBrain. Prepare and e-file state & federal income taxes online starting $14.95. It's Easy, Fast, Secure, and IRS authorized.
http://www.taxbrain.com

7. eSmart Tax - Online tax software
FREE Tax Filing - Online Tax Software - online tax preparation software and free e-File from eSmart Tax Software. Federal IRS and State online tax preparation software and e-File tax services. IRS efile tax return form for federal & state, 1040 tax forms and more. eSmart Tax was designed to simplify the tax filing process.
http://www.esmarttax.com

8. File my taxes for FREE! with FreeTaxUSA
FreeTaxUSA participates in the IRS free file program. Qualified taxpayers may file their federal taxes online for FREE, and most can be completed within 30 minutes. Quick and easy to use, and refunds can be deposited into a checking or savings account in as little as 10 days.
http://www.freetaxusa.com

9. TaxEngine.com - E-File Taxes, Online Tax Preparation, File IRS Tax Return
TaxEngine is an online tax preparation service designed to maximize your tax refund in a simple-to-use environment.
http://www.taxengine.com

10. Online Tax Pros - Online Taxes, E-file Online Tax Preparation Tax Return
Online Tax Pros E-file Online Taxes and Online Tax Preparation - Online tax returns and filing taxes online made Easy, Fast, Secure, and IRS approved.
http://www.onlinetaxpros.com

11. TaxACT
FREE tax software from TaxACT allows you to do your taxes online, offering free IRS E-file. File taxes online with TaxACT tax software.
http://www.taxact.com

12. Vertex
Vertex® Returns Processing Services are a comprehensive suite of software and consulting services that addresses your monthly tax compliance management from the time your data is received until your returns and payments are filed.
http://www.vertexinc.com

13. Online Tax Preparation Services: Online Income Tax Preparation & Online Tax Return Filing For Union Members
Online income tax preparation via the Union Plus Online Tax Preparation Service. Online tax return preparation and tax return filing for state & federal income taxes starting at $14.95 for union members.
http://www.unionplus.org/taxes

14. E-File Online - IRS and State Income Tax Return Preparation,Tax Help and E-file Services
E-File Online Provides Income tax preparation and EFile of IRS Federal Tax Forms and State Tax Returns.
http://www.e-file-online.com

15. Tax Exact
Online tax return preparation
http://www.taxexact.com