Directory information, not recipient confirmation. Fax numbers can change and differ by department, location, form, or plan. Confirm this destination directly with Internal Revenue Service (IRS) before sending sensitive documents. FaxFlow is not affiliated with this organization.
Internal Revenue Service (IRS) fax number
(855) 800-5944
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.
- Keep the delivery confirmation with your submission records.
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.
Review official form instructionsSources and verification
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