How to Change Members of an LLC With the IRS: EIN and Filings

To change members of an LLC with the IRS, the filings you owe depend on whether the change alters your LLC’s tax classification. A single-member LLC that adds a second owner becomes a partnership and needs a new EIN plus split-year returns. A partnership that gains or loses a partner while keeping at least two members keeps its EIN and reports the change on its annual Form 1065 and the affected members’ Schedule K-1s. In either case, if the person who controls the LLC’s money changes, you file Form 8822-B within 60 days.

Start With Your Tax Classification

The IRS assigns every LLC a default tax classification based on how many members it has. One member means a disregarded entity: the owner reports the LLC’s income on their personal Form 1040, usually Schedule C or Schedule E. Two or more members means the LLC is automatically treated as a partnership and must file its own Form 1065 with a Schedule K-1 for each member.¹²

Switching between those two states happens automatically under Treasury Regulation 301.7701-3(f)(2). No election, no filing. The tax classification changes on the exact date the membership change takes effect, not at year-end.³ That date drives every deadline that follows, so pin it down before you do anything else.

When You Need a New EIN

A new Employer Identification Number is required when the classification flips, not simply when a person joins or leaves. Two situations trigger it:

A single-member LLC adds a second member and becomes a partnership. The old disregarded-entity EIN cannot be used on the partnership’s Form 1065.⁴
A multi-member LLC shrinks to a single member. The partnership’s EIN is retired and the remaining owner reports under their own SSN or personal EIN.

If a multi-member LLC swaps partners but keeps at least two members throughout, the classification stays the same and the existing EIN carries forward. Under 26 U.S.C. § 708, the partnership is a continuing entity as long as any part of its business continues to be carried on by its partners.⁵ Electing a different tax treatment on its own — say, moving from partnership to S-corporation — also does not require a new EIN.⁶

Applying for the New EIN

When you do need one, apply on Form SS-4. The form asks for the name and taxpayer ID of the responsible party (the individual who controls the entity’s funds) and the box matching your new tax status, which for most single-to-multi-member transitions is partnership.⁴

The IRS online application issues an EIN immediately on approval. You can apply for only one EIN per responsible party per day, and the session times out after 15 minutes with no way to save progress.⁷ Faxing Form SS-4 typically returns an EIN within four business days; mailing takes about four weeks.⁴

Get the new EIN in place before the first return under the new classification is due, and update it with every bank, payment processor, and vendor that issues or receives 1099s tied to the LLC.

Updating the Responsible Party

The IRS defines the responsible party as the individual who owns, controls, or exercises effective control over the entity and directly or indirectly manages its funds.⁸ It must be an actual person, not another business entity.

When a membership change means a different person now controls the LLC’s money, file Form 8822-B within 60 days of the change. It is a paper form; there is no online option.⁹

The IRS does not impose a direct penalty for filing 8822-B late. The risk is quieter and worse: deficiency notices and demand letters go to the wrong person at the wrong address while penalties and interest keep accruing. By the time you find out, the number has grown.⁹

Reporting the Change on the Annual Return

How the change shows up on your annual filing depends again on whether the classification flipped.

Continuing Partnership: Adjusted K-1s

If the LLC remains a partnership before and after, Form 1065 is where the IRS learns about the change. The return must reflect the exact dates of each ownership shift during the year, and every person who held an interest at any point during the year gets a Schedule K-1.²

A departing member’s K-1 covers January 1 (or their entry date) through their exit date. A new member’s K-1 covers their entry date through December 31. The operating agreement dictates how income is divided across those partial periods, usually either a daily proration or an interim-closing-of-the-books method. Keep the amended operating agreement with your records; the IRS can ask you to justify the allocation.

Classification Flip: Two Short-Year Returns

When the change moves the LLC between disregarded entity and partnership mid-year, you file two returns covering two short periods.

Say a single-member LLC admits a second member on July 1. The original owner files a final Schedule C on their personal return for January 1 through June 30. The new partnership files an initial Form 1065 for July 1 through December 31.³ Reverse the direction if a two-member LLC loses a member on September 15: the partnership files a final Form 1065 for January 1 through September 14, and the remaining owner picks up the rest of the year on Schedule C.

Deadline math is where people get burned. A calendar-year partnership normally files Form 1065 by March 15, but a short-year return is due by the 15th day of the third month after the short period ends.¹⁰ If your single-member LLC admitted a partner in March, the partnership’s first short-year 1065 is due in mid-June, not the following March. Mark that date the day the membership change happens.

Penalties for Missing These Filings

Partnership penalties are calculated per partner, per month, and they compound quickly.

Late Form 1065: for returns due after December 31, 2025, $255 per partner for each month or partial month the return is late, up to 12 months. A three-member LLC that files four months late owes $3,060.¹¹
Missing or incorrect Schedule K-1: $340 per K-1. If the IRS finds the failure intentional, the penalty doubles to $680 per K-1 with no aggregate cap.¹²

If Your LLC Elected Corporate Tax Treatment

The rules above assume your LLC uses the default classification. Some LLCs elect corporate treatment by filing Form 8832, or S-corporation treatment by filing Form 2553.¹³ For those LLCs, adding or removing a member does not shift the tax classification. The EIN carries forward, and the change is reported on the next Form 1120 or 1120-S.

One trap for S-corporation LLCs: an S-corp cannot have more than 100 shareholders, and all shareholders must be U.S. citizens or residents. Admitting a foreign member or exceeding the cap terminates the S-election and drops the LLC into C-corporation status. That is a much larger tax event than the membership change itself, and it happens automatically once the disqualifying member is admitted.

Don’t Skip Your State Filings

Federal reporting is only half the picture. The state where your LLC was formed almost always requires an amendment to the Articles of Organization or Certificate of Formation when the membership roster changes, and a separate change-of-registered-agent filing if the departing member held that role. State filings run on a completely separate track from IRS filings; handling one does not handle the other. A lapsed state registration can cost the LLC its good standing and, with it, the liability shield that made forming the LLC worthwhile.

1
Internal Revenue Service. Single Member Limited Liability Companies
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Internal Revenue Service. About Form 1065, U.S. Return of Partnership Income
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eCFR. 26 CFR 301.7701-3 – Classification of Certain Business Entities
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Internal Revenue Service. Instructions for Form SS-4 (Rev. December 2025)
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Office of the Law Revision Counsel. 26 USC 708 – Continuation of Partnership
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Internal Revenue Service. When to Get a New EIN
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Internal Revenue Service. Get an Employer Identification Number
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Internal Revenue Service. Responsible Parties and Nominees
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Internal Revenue Service. Form 8822-B, Change of Address or Responsible Party
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Internal Revenue Service. 2025 Instructions for Form 1065 – U.S. Return of Partnership Income
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Internal Revenue Service. Failure to File Penalty
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Internal Revenue Service. Instructions for Form 1065 (2025)
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Internal Revenue Service. LLC Filing as a Corporation or Partnership