Guides · Fax numbers

IRS Form 3911 fax number (trace a refund)

Checked against irs.gov on November 11, 2026

Fax Form 3911 to the IRS Refund Inquiry Unit for the state you live in; the numbers are below. The IRS updated these numbers in October 2026, so older lists may be wrong. Send only Form 3911 to these numbers, one form per refund.

Fax numbers

Individuals: pick the state you live in. If the IRS mailed you the form with a fax number filled in, use that one.

How to fax it

  1. Fill in Form 3911, one for each refund you’re tracing.
  2. Find the number for your state above (or use the one the IRS filled in on the form it sent you).
  3. Send only the Form 3911 from dimefax.com/send. The IRS says not to send anything else to these numbers.

Tips

Dimefax costs 10¢ a page and you’re only charged if the fax goes through. On the web, page credits come in packs of 50 for $4.99, 100 for $9.99 or 200 for $19.99; the Dimefax iPhone app also sells 10 for $0.99. Credits you don’t use stay in your account and last as long as you fax once a year.

Where these numbers come from

Dimefax isn’t part of, or endorsed by, the IRS. We copied these numbers from irs.gov on November 11, 2026. Agencies change their numbers: if your letter, notice or form gives a different one, use that.

Questions

What is the fax number for Form 3911?

It depends on your state; see the list above. For example, New York uses 855-297-7736 and California 855-332-3068.

Did the Form 3911 fax numbers change?

Yes. The IRS page for Form 3911 notes updated addresses and fax numbers in October 2026. The numbers here were checked on November 11, 2026.