IRSのFAX番号：IRSの税務フォームをFAXで送信する方法と場所

An IRS fax number is a dedicated line that lets you send certain forms and documents straight to a specific IRS office instead of mailing them. There's no single number for the whole agency: each form gets its own number, and several route by the state you're filing from. Use the lookup tool at the top of this page, or check your form's instructions, then confirm the number on IRS.gov before sending, since numbers do change.

Cross-check it against the number printed on your current IRS notice, the instructions for your specific form on IRS.gov, or our lookup tool above, which links out to the relevant IRS source page. IRS fax numbers change periodically without much public notice, so don't rely on a number from an old form revision or a search result alone.

Include your full name, your SSN or EIN, the exact form number and tax year, the total page count including the cover sheet itself, a phone number and email where you can be reached, and a one-line description of what you're sending. Missing or incomplete cover sheet details are one of the most common reasons a faxed form gets delayed or set aside for follow-up.

Double-check you have the correct fax number, since sending to the wrong one is the top mistake. Make sure your document is legible, not faint or blurry, and that no pages or signatures are missing, since incomplete submissions are often rejected. Keep your delivery confirmation in case the IRS claims they never received your fax. And confirm your form is fax-eligible first: some forms, like Form 1040, are rarely accepted this way.

For some notices, yes. The IRS Document Upload Tool accepts responses to specific notices that include a QR code or upload link. It doesn't replace fax for most forms discussed here, like Form SS-4 or Form 2553, which still require faxing or mailing. Check your notice for an upload option before defaulting to fax.

Not on every form. Form 2848 (Power of Attorney) and Form 8821 (Tax Information Authorization) require a wet ink, handwritten signature when submitted by fax or mail. Electronic or digital signatures aren't accepted for these two forms through this channel. Check your specific form's instructions before signing.

Yes. Download the Fax.Plus app, sign in or create a free account, then open Send Fax and enter the recipient's number. Attach a file, or use your phone's camera to scan a paper document right in the app, add a cover page if you like, and tap Send. You'll get a push notification once your fax is delivered.

Yes, using Fax.Plus's email-to-fax feature. Attach your document to an email addressed in the format Fax.Plus provides for the recipient's fax number, then send it like any other email. Fax.Plus converts and delivers it as a real fax, so you don't need the app or web dashboard to send it.

Generally, no. The IRS doesn't send a separate confirmation once your fax arrives. Keep your Fax.Plus delivery confirmation, which shows the exact time your fax was successfully transmitted, as your proof of submission if the IRS later asks whether or when you sent something.

It depends on the form. Form SS-4 (EIN) requests are typically processed within a few business days. Form 2848 and Form 8821 usually take 3 to 5 business days. Form 2553 determinations can take up to 60 days. These are typical ranges; peak season can extend them. Your delivery confirmation only proves you sent it, not that the IRS has finished processing.

Use Form 4506 to request a full copy of a past return, or Form 4506-T to request a free transcript instead. Both can be faxed to the appropriate IRS office. There's a fee for a full copy via Form 4506; transcripts requested with Form 4506-T are typically free.

Yes, using Form 1040-X, and it must follow IRS guidelines for amended returns. Faxing acceptance can vary by situation, so check the instructions that came with your specific notice or consult the current Form 1040-X instructions before sending, especially if you're responding to a specific IRS letter.

Faxing is one of the fastest options, since it delivers in seconds versus weeks by mail. Send it, save your Fax.Plus delivery confirmation immediately, and follow up by phone to confirm receipt, especially for time-sensitive notices where processing can still take several business days on the IRS side.