Fax to Government & tax
California FTB Filing Enforcement Fax (916) 855-5646
Government & tax
California FTB — Filing Enforcement
Sacramento, CA
Verified Mar 2026
Fax number
(916) 855-5646
What to include
- ✓FTB Filing Enforcement notice you are responding to
- ✓Cover sheet with taxpayer name, tax year, and daytime phone
- ✓Completed forms or supporting documents FTB requested
- ✓Clear copies—not irreplaceable originals
Quick info
Department: Franchise Tax Board — Filing Enforcement Section (Personal Income Tax)
Fax line: (916) 855-5646
- Use only when your FTB Filing Enforcement notice or ftb.ca.gov lists (916) 855-5646
- Put taxpayer name, SSN/ITIN last digits as directed, and tax year on the cover page
- Other FTB fax lines exist—do not reuse this number for collections or unrelated units
Confirm on ftb.ca.gov (e.g. FTB 1240 / Filing Enforcement publications) or your FTB notice. Other FTB units use different fax lines—collections, business entities, and DMV registration debt are not this number.
Prerequisites — what to prepare
Before you fax California FTB — Filing Enforcement, gather these items into one PDF when possible:
- ✓FTB Filing Enforcement notice you are responding to
- ✓Cover sheet with taxpayer name, tax year, and daytime phone
- ✓Completed forms or supporting documents FTB requested
- ✓Clear copies—not irreplaceable originals
Step-by-step — send via RonFax
No fax machine required. Pay once from $1.99 for up to 3 pages ($0.50 per extra page).
- Merge your FTB response into one PDF (cover page first).
- Confirm (916) 855-5646 matches ftb.ca.gov or your Filing Enforcement letter.
- Upload to RonFax, review page price, pay once, and save your status link.
Send your fax
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