• Corporate taxpayers (Forms 1120, 1120S, 1120-F) may contact the e-help Desk at 866-255-0654.

 

 

  • Taxpayers with account or tax law questions may call 800-829-4933.

 

  • Tax practitioners with account or tax law questions may call 800-829-8374.

 

  • Software developers and vendors may contact the e-help Desk at 866-255-0654 with questions about e-filing.