There is no single fax number for IRS Form 433-D. The correct fax number for IRS Form 433-D depends on which IRS office is handling your installment agreement, and you’ll find it printed on the most recent letter or notice the IRS sent you about your tax debt. If that letter isn’t in front of you, call the IRS collections line at 800-829-3903 and ask for the fax number of the unit assigned to your case.
Why There’s No Universal Fax Number
Form 433-D is the paperwork the IRS uses to put installment agreement terms in writing, including your monthly payment amount, due date, and any direct debit authorization.1Internal Revenue Service. Form 433-D (Rev. 7-2024) Installment Agreement You typically use it to modify an existing agreement, reinstate one that defaulted, or add direct debit to a plan you already have.
The IRS routes the form to whichever office is actively managing your account. That could be a local Collection Advisory Group, a centralized Service Center, or a Revenue Officer assigned to your file. Each of those offices runs its own fax line, so a number that works for one taxpayer’s case will not work for another’s.
A note on scope: if you’re setting up a payment plan for the first time, Form 433-D isn’t your form. That’s Form 9465, Installment Agreement Request, which goes to an IRS Service Center rather than to a case-specific unit.2Internal Revenue Service. About Form 9465, Installment Agreement Request
How to Find the Right Fax Number
Look at Your Most Recent IRS Letter
The most reliable place to find the fax number is on the last piece of correspondence you got from the IRS about your tax debt. Common examples include Letter 2849 or Letter 2850 confirming an installment agreement, Notice CP523 warning about a potential default, or a Notice of Intent to Levy.3Internal Revenue Service. Understanding Your CP523 Notice These letters include contact details, usually both a phone number and a fax number, for the specific unit working your account.
The form itself points you the same way. Its instructions say to return Part 1 to the IRS “at the address on the letter that came with it or the address shown in the ‘For assistance’ box on the front of the form.”1Internal Revenue Service. Form 433-D (Rev. 7-2024) Installment Agreement The fax destination follows the same rule: send it to the office identified on your letter, not to a general IRS number.
Call 800-829-3903 if You Don’t Have the Letter
If your correspondence is lost, call the IRS collections assistance line at 800-829-3903.4Internal Revenue Service. Federal Payment Levy Program When you get a representative, ask specifically for the fax number of the Collection Advisory Group or Revenue Officer assigned to your case. Be direct. You want the number for the office processing your modification or reinstatement, not a general inquiry line. The representative can pull up your account and give you the right one.
Faxing to a general IRS number rather than the assigned unit’s line is the mistake to avoid. The document ends up in a routing queue and can sit for weeks before it reaches the right desk. If you’re trying to reinstate a defaulted agreement before the IRS restarts collection, those weeks matter.
What to Send With the Fax
Include a cover sheet with your name, Social Security number or Employer Identification Number, a daytime phone number, and a return fax number. State clearly that you’re transmitting Form 433-D and note whether it’s for a modification, a reinstatement, or a new direct debit authorization.
If you’re setting up or changing direct debit, either attach a voided check or fill in your bank’s routing number and account number on the form. The IRS is specific about the routing number: the first two digits must be between 01 and 12 or between 21 and 32, and you should not use the numbers printed on a deposit slip, because deposit slips can include internal routing codes that won’t work.1Internal Revenue Service. Form 433-D (Rev. 7-2024) Installment Agreement Confirm the correct numbers with your bank before you send.
Once the fax goes through, print the transmission confirmation and keep it. That confirmation is your proof of timely submission. If the IRS later says it never received the form, the date and time stamp on that page is the only evidence you’ll have.
Consider the Online Tool Before You Fax
For a lot of common changes, you don’t need to fax anything. The IRS Online Payment Agreement tool lets you adjust your monthly payment amount, change the payment due date, convert to direct debit, update your bank information, or reinstate a defaulted agreement.5Internal Revenue Service. Online Payment Agreement Application For most straightforward modifications, it’s faster than faxing Form 433-D and it’s cheaper.
The tool has limits. If your proposed new payment amount falls below the IRS minimum, the system will push you to file additional paperwork (such as Form 9465 with a Collection Information Statement) rather than finishing the change online. Cases assigned to a Revenue Officer, or situations involving disputed amounts, will still need Form 433-D sent directly to the assigned unit.
Mail or In-Person Options
If faxing isn’t practical and the online tool doesn’t cover your situation, you can mail Form 433-D. Send it to the address on your most recent IRS correspondence. Without that letter, call 800-829-3903 to get the correct mailing address for the unit handling your case.4Internal Revenue Service. Federal Payment Levy Program
Use Certified Mail with Return Receipt Requested. The green return receipt card is your proof of delivery, and the postmark establishes your submission date for any deadline.6Internal Revenue Service. Topic No. 301, When, How and Where to File Keep the card. If a dispute comes up later about whether you met a deadline, the card and postmark are your best evidence.
You can also submit Form 433-D in person at a Taxpayer Assistance Center. The IRS requires an appointment for TAC visits, and you schedule one by calling 844-545-5640. When you hand the form over, ask the employee for a date-stamped copy or a receipt. Walk out without that proof and you have no record the visit happened.
Confirm the IRS Actually Processed It
Don’t assume a successful fax transmission means the change is done. Give it two to three weeks, then check your account status. The IRS Online Account portal shows your payment plan details, including agreement type, due dates, and payment amounts.5Internal Revenue Service. Online Payment Agreement Application If the modification or reinstatement appears there, you’re set.
You can also pull an account transcript, which will reflect the change once it’s been processed. Each transcript covers only one tax year and may not show pending actions yet.7Internal Revenue Service. Online Account for Individuals If three weeks pass with no update, call 800-829-3903 and reference the date and time on your fax confirmation. That confirmation is exactly why you kept it.