Can I fax Form 433-D to the IRS?

Only if the IRS notice you received lists a fax number — there is no single public fax line for Form 433-D. The official form tells you to return Part 1 to the address on the letter that came with it, or the address in the "For assistance" box on the front of the form. If your specific notice provides a fax number, you can fax it; otherwise, send it to the address on your notice (per irs.gov).

Where do I send Form 433-D?

Return Part 1 of Form 433-D 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. There is no single nationwide address or fax number — routing depends on the IRS office that issued your notice.

What is the difference between Form 433-D and Form 9465?

Form 9465 is the Installment Agreement Request you submit to ask for a payment plan. Form 433-D is the Installment Agreement itself — the IRS typically sends it to you once a plan is approved so you can confirm the terms and authorize direct debit. If you are starting from scratch, see our Form 9465 guide.

Do I need to set up direct debit on Form 433-D?

Direct debit is not always required, but it is encouraged. A Direct Debit Installment Agreement (DDIA) lowers your setup fee, reduces the chance of a missed payment, and is required for some balances. Form 433-D includes a section for your bank routing and account numbers if you choose direct debit.

What happens after I return Form 433-D?

Once the IRS receives your signed Form 433-D, your installment agreement is recorded and payments begin on the schedule shown. Keep filing and paying future taxes on time — defaulting on the agreement can let the IRS resume collection. Interest and the failure-to-pay penalty continue to accrue on the unpaid balance.

Where to Send IRS Form 433-D (2026) — Installment Agreement

At-a-Glance: Form 433-D

Where to Send

The address on your IRS letter

Form Purpose

Installment Agreement

What You Confirm

Payment plan terms & direct debit

Public Fax Number

None — no single public fax line

Where to send Form 433-D

Send it to the address on the IRS letter you received. There is no single public fax number for Form 433-D — routing depends on the IRS office that issued your notice.

Per the official form: "return Part 1 to 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."

What Is Form 433-D?

Form 433-D, "Installment Agreement," is the document that records the terms of an approved IRS payment plan. The IRS typically sends Form 433-D to you once your installment agreement is approved so you can confirm the monthly amount, the payment date, and — if you choose — authorize direct debit from your bank account. It is different from Form 9465, which is the request you submit to ask for a plan.

Where to Send Form 433-D

There is no nationwide address and no single public fax number for Form 433-D. The official IRS form instructs you to:

•Return Part 1 to the IRS at the address on the letter that came with it. The letter that accompanied your Form 433-D routes it to the correct unit.
•If you do not have that letter, use the address shown in the "For assistance" box on the front of the form.
•Keep a copy of Part 2 for your records — Part 1 is the copy you return to the IRS.

Direct from the IRS form

"return Part 1 to 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."

Source: IRS.gov — Form 433-D (f433d.pdf). Always verify against the current form before sending. Last verified: June 2026.

Where to send IRS Form 433-D Installment Agreement
Detail	Form 433-D
Where to send	The address on the letter that came with it, or the "For assistance" box on the form
Public fax number	None — fax only if your specific notice lists a number
Form purpose	Records the terms of an approved installment agreement
Last verified	June 2026

How to Complete & Return Form 433-D

Review the terms the IRS pre-filled

Check the balance, monthly payment amount, and payment date. Make sure they match what you agreed to.

Add direct debit details (recommended)

Enter your bank routing and account numbers to set up a Direct Debit Installment Agreement (DDIA), which lowers fees and prevents missed payments.

Sign and date Part 1

Both spouses must sign for a joint liability. An unsigned form will be returned.

Return Part 1 to the address on your letter

Send Part 1 to the IRS at the address on the letter that came with the form, or the address in the "For assistance" box. Keep Part 2 for your records.

Did your IRS letter list a fax number?

If the notice that came with your Form 433-D provides a fax number, FaxFlow lets you fax it from your phone or computer with delivery confirmation — no fax machine needed. There is no single public fax line for this form, so always use the number on your own notice.

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FAQ Section

Can I fax Form 433-D to the IRS?
Only if the IRS notice you received lists a fax number — there is no single public fax line for Form 433-D. The official form tells you to return Part 1 to the address on the letter that came with it, or the address in the "For assistance" box on the front of the form. If your specific notice provides a fax number, you can fax it; otherwise, send it to the address on your notice (per irs.gov).
Where do I send Form 433-D?
Return Part 1 of Form 433-D 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. There is no single nationwide address or fax number — routing depends on the IRS office that issued your notice.
What is the difference between Form 433-D and Form 9465?
Form 9465 is the Installment Agreement Request you submit to ask for a payment plan. Form 433-D is the Installment Agreement itself — the IRS typically sends it to you once a plan is approved so you can confirm the terms and authorize direct debit. If you are starting from scratch, see our Form 9465 guide.
Do I need to set up direct debit on Form 433-D?
Direct debit is not always required, but it is encouraged. A Direct Debit Installment Agreement (DDIA) lowers your setup fee, reduces the chance of a missed payment, and is required for some balances. Form 433-D includes a section for your bank routing and account numbers if you choose direct debit.
What happens after I return Form 433-D?
Once the IRS receives your signed Form 433-D, your installment agreement is recorded and payments begin on the schedule shown. Keep filing and paying future taxes on time — defaulting on the agreement can let the IRS resume collection. Interest and the failure-to-pay penalty continue to accrue on the unpaid balance.

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⚠️ Disclaimer

FaxFlow is not affiliated with or endorsed by the IRS. Fax numbers, addresses, and filing rules change often and may be outdated or incorrect here — always verify against the official IRS website (irs.gov) before sending. This page is for general information only and is not tax, legal, or financial advice; consult a qualified tax professional for your situation.