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Internal Revenue Service (IRS) fax number
(855) 800-5944
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Used for: Respond to CP518/CP518B Business Notice by faxing the requested documents or the completed response form to 855-800-5944, using the envelope provided or an online fax service. This is used when the IRS is requesting a missing return or other action from a business taxpayer.
Fax destination details
- Purpose
- Respond to CP518/CP518B Business Notice by faxing the requested documents or the completed response form to 855-800-5944, using the envelope provided or an online fax service. This is used when the IRS is requesting a missing return or other action from a business taxpayer.
- Form
- CP518B — IRS CP518B - Notice: Missing Return (Business) (CP518 Business Notice)
- Website
- Visit organization website
Before you send
- Confirm that this exact department handles your document or request.
- Check the organization website or call its main line for the current fax number.
- Include a cover sheet and any case, member, claim, or form reference required.
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Fax the documents or completed response form to 855-800-5944 as described in the CP518 notice; use the envelope provided with the notice or the instructions on the notice for submission.
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