IRSフォーム866は、主にIRSと大企業が特定の会計年度の税務債務を最終的に解決するために使用する正式な合意書であり、両当事者が税務問題に関する将来の紛争を回避するのに役立ちます。

フォーム866は、内国歳入庁と納税者間の拘束力のある合意として機能し、特定の期間の税務債務の最終的な決定を確立します。両当事者が署名すると、不正行為、職務怠慢、または不実表示が発見されない限り、IRSはその年度を再開または監査することができなくなります。
Form 866 is not something you download and file on your own. It is drafted during an active IRS Examination or Appeals case, usually as a joint effort between the examiner and the taxpayer or their representative, and it exists for internal IRS use rather than as a public-facing filing. Here's what that means for faxing it:
Form 866 does not have a single published fax number the way most forms on this site do, because it is never something you fill out and send in cold. It is finalized inside an active IRS Examination or Appeals case, and the examiner or Appeals officer handling that case prepares and submits it.
That said, the IRS's own procedures do allow you to sign and return your copy by fax. Per Internal Revenue Manual 8.13.1.3.5, once you have been in contact with your assigned IRS examiner or Appeals officer and your case file documents that contact and your request to submit your signature by fax, the IRS can accept your signed Form 866 by fax for any amount of tax. There is no general public number to list here, your caseworker gives you the correct one for your case. Fax.Plus can still send your signed agreement to that number from a computer, phone, or email, with a timestamped delivery confirmation for your records.
There's no blank Form 866 to download and fax in on your own schedule, this is a document that gets finalized inside an active IRS Examination or Appeals case. Once you and your caseworker have agreed on the terms and told the IRS you'd like to submit your signature by fax, Fax.Plus lets you sign and send your copy of the agreement straight from a computer, phone, or email to the number they give you, with a timestamped delivery confirmation for your records.
Yes, but only within an active case. Once you've been in contact with the IRS examiner or Appeals officer handling your closing agreement and your case file documents that contact and your request to submit by fax, IRS procedure (Internal Revenue Manual 8.13.1.3.5) allows them to accept your signed Form 866 by fax for any amount of tax. There is no general public fax number for Form 866, your caseworker gives you the one to use.
You don't download Form 866 and file it on your own initiative. It comes out of an active IRS Examination or Appeals case: once you and the IRS reach agreement on your final tax liability for a given period, the examiner or Appeals officer drafts the agreement, often working with you or your representative on the wording, and you sign it before it goes to the IRS for countersignature.
Only in narrow circumstances. Once both sides sign, the agreement is final and conclusive for the tax and periods it covers, and the IRS generally cannot reopen or reaudit them. The IRS can still investigate afterward if there's fraud, malfeasance, or misrepresentation of a material fact connected to how the agreement was reached, an honest mistake by the examiner does not qualify.
Any taxpayer can enter into a Form 866 closing agreement. Corporations and large entities use them most often because their cases tend to involve multiple tax years and complex issues worth locking in permanently, but the underlying authority covers any person, so an individual with a qualifying case can sign one too.
It can. If you want a CPA, attorney, or enrolled agent to negotiate or sign on your behalf, or simply to be copied on correspondence, the IRS needs a valid Form 2848 power of attorney on file for that person first. Without it, the IRS deals with you directly.
A Form 866 closing agreement usually shows up near the end of a larger IRS case. Here's what else comes up around IRS examinations, appeals, and settling tax matters with the IRS.
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