How to Fax IRS Form 433-D to the IRS — Installment Agreement
Form 433-D is the signed installment agreement itself, usually set up with a direct-debit authorization drawn from your bank account. Unlike a request form, 433-D is typically prepared by or with an IRS employee and sent back to the specific revenue officer or Automated Collection System unit handling your case. Faxing it back to the number on your correspondence is a common, expected step. This guide covers doing that cleanly and keeping proof of the return.
Does the IRS accept a fax?
Yes, in the case context it belongs to — 433-D is generally returned by fax to the revenue officer or ACS unit that is administering your balance, and the fax number is provided on the correspondence or worksheet you received. It is not filed to a general public fax line; it goes back to the office that set up the agreement.
Finding the official fax number
The fax number for a 433-D is the direct line of the IRS employee or unit working your account — it appears on the letter, the agreement worksheet, or the contact information the revenue officer gave you. Take it from that specific correspondence rather than any general listing, and if you cannot locate it, call the contact number on the notice to confirm where to send the signed agreement.
What to include on every page
- Your name, address, and SSN, matching the balance the agreement covers
- The agreed monthly payment amount and the scheduled payment date
- Your bank routing and account numbers for the direct-debit authorization
- Your signature (and spouse's, if a joint balance) authorizing the agreement
- The case, notice, or revenue officer reference from your correspondence
How to fax IRS Form 433-D (Installment Agreement) to the IRS
- 1Review Form 433-D for the correct payment amount, date, and direct-debit bank details
- 2Sign and date the agreement — an unsigned 433-D cannot be put into effect
- 3Find the return fax number on your IRS letter or from the revenue officer handling the case
- 4Scan or export the signed 433-D as a clear PDF, keeping the bank numbers legible
- 5Log in to Send FAX Mail, upload the PDF, enter the fax number from your correspondence, and send
- 6Save the dated confirmation with your case file as proof the agreement was returned
Confirming it arrived
Send FAX Mail returns a time-stamped confirmation the moment the signed agreement reaches the assigned unit's fax line — keep it with your case correspondence. Direct-debit installments usually begin on the next scheduled cycle after the IRS processes the 433-D, so the confirmation documents when you returned the signed agreement if a first payment or a default question later comes up.
What’s current · as of July 2026
Recent updates
Federal agencies still write fax into new rules and notices
The Federal Register — the daily journal of U.S. federal rulemaking — regularly publishes rules and notices that reference fax as an accepted or required submission channel for filings with agencies like the IRS, SSA, and CMS. That is why fax remains a live requirement for many official forms even as electronic portals expand.
Federal Register →
Faxing IRS Form 433-D (Installment Agreement) to the IRS — FAQ
Back to the office running your case — the revenue officer or ACS unit whose fax number is printed on the letter or worksheet you were given. This form is not sent to a general filing center; it returns to the specific employee or team that arranged the installment agreement with you.
It carries your bank routing and account numbers for the direct debit, so confirm those digits are correct and legible in the scan, and that you are sending to the exact fax line from your correspondence. A transposed account number or a wrong destination can delay the agreement or misdirect financial details.
Form 9465 requests an installment plan; 433-D is the executed agreement that puts one in place, typically with direct-debit terms and set up alongside an IRS employee. You fax 9465 to start the conversation and return a signed 433-D to finalize the arrangement.
The IRS has to process the returned agreement before the first automatic withdrawal, so debits generally begin on the next scheduled cycle once that is done. Your dated fax confirmation shows the date you sent the signed form, which helps if the initial payment timing is ever disputed.
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