Single-member vs multi-member LLC

The number of owners changes more about an LLC than most people expect: the tax return, the deadlines, the paperwork and even whether a new EIN is needed. This guide sets out the differences and the special rules for married couples.

By Muhammad Bilal, Chartered Accountant. Reviewed by Awais Jameel, Chartered Accountant. Checked against official sources on . 3 minute read.

Short answer

The single-member vs multi-member LLC difference is mainly tax. A single-member LLC is ignored by the IRS by default and reported on the owner's return. A multi-member LLC is taxed as a partnership, files Form 1065 each year and gives each member a Schedule K-1. Liability protection is similar, but a multi-member LLC needs a fuller operating agreement.

At a glance

Single-member default tax
Disregarded: reported on the owner's return
Multi-member default tax
Partnership: Form 1065 and K-1s, due March 15
Foreign single owner
Form 5472 with a pro forma Form 1120 each year
Foreign partners
Partnership may have to withhold tax on their share
Married couples in community property states
Can choose single-member or partnership treatment
Changing member count
Changes tax treatment and often needs a new EIN
Single-member vs multi-member LLCSingle-member default tax: Disregarded: reported on the owner's return; Multi-member default tax: Partnership: Form 1065 and K-1s, due March 15; Foreign single owner: Form 5472 with a pro forma Form 1120 each year; Foreign partners: Partnership may have to withhold tax on their share; Married couples in community property states: Can choose single-member or partnership treatment; Changing member count: Changes tax treatment and often needs a new EIN.KEY FACTS AT A GLANCESingle-member vs multi-member LLCSingle-member default taxDisregarded: reported onthe owner's returnMulti-member default taxPartnership: Form 1065and K-1s, due March 15Foreign single ownerForm 5472 with a proforma Form 1120 each yearForeign partnersPartnership may have towithhold tax on theirshareMarried couples in community propertystatesCan choose single-memberor partnership treatmentChanging member countChanges tax treatment andoften needs a new EINChecked against official sourcesTax BakersSingle-member vs multi-member LLCSingle-member default tax: Disregarded: reported on the owner's return; Multi-member default tax: Partnership: Form 1065 and K-1s, due March 15; Foreign single owner: Form 5472 with a pro forma Form 1120 each year; Foreign partners: Partnership may have to withhold tax on their share; Married couples in community property states: Can choose single-member or partnership treatment; Changing member count: Changes tax treatment and often needs a new EIN.KEY FACTS AT A GLANCESingle-member vs multi-member LLCSingle-member default taxDisregarded: reported on the owner's returnMulti-member default taxPartnership: Form 1065 and K-1s, due March15Foreign single ownerForm 5472 with a pro forma Form 1120 eachyearForeign partnersPartnership may have to withhold tax ontheir shareMarried couples in community property statesCan choose single-member or partnershiptreatmentChanging member countChanges tax treatment and often needs a newEINChecked against official sourcesTax Bakers
Key facts at a glance, as set out in this guide.

How do they compare?

Single-member LLCMulti-member LLC
Default federal taxDisregarded entityPartnership
Federal returnNone of its own. Schedule C for an individual ownerForm 1065 every year, with a K-1 for each member
Due dateWith the owner's return, April 15March 15
Late filing penaltyBased on tax owed by the ownerPer member per month, even with no tax owed
Self-employment taxOn the owner's whole profitOn active members' shares and guaranteed payments
Profit splitsAll to the ownerFlexible, within the tax rules
Operating agreementShortEssential, covering buyouts, voting and disputes
Can elect S or C corporation taxYesYes

More on each tax option is in how LLCs are taxed.

Is liability protection different?

Both give the members limited liability for the LLC's debts. Courts are sometimes more willing to disregard a single-member LLC where the owner has mixed personal and business affairs, so separate accounts and an operating agreement matter even more with one owner. In some states, a single-member LLC gives weaker protection against the owner's personal creditors reaching the LLC interest.

What changes for foreign owners?

  • One foreign owner: the LLC files Form 5472 with a pro forma Form 1120 each year it has transactions with its owner.
  • Two or more members, any foreign: the LLC files Form 1065. If it has income effectively connected with a US business, it generally withholds tax on the foreign members' shares. See Form 1065.

What about married couples?

An LLC owned by a married couple has two members, so by default it is a partnership. There is an exception: in community property states, a couple who own an LLC as community property can choose to treat it either as a disregarded entity or as a partnership, under a long-standing IRS procedure. The separate qualified joint venture election, which lets spouses file two Schedules C instead of a partnership return, applies to unincorporated businesses, not to LLCs.

See husband and wife LLC taxes for the full options.

What happens when the number of members changes?

  • From one member to two: the LLC becomes a partnership for tax from that date, generally needs a new EIN, and starts filing Form 1065. The operating agreement needs rewriting.
  • From two members to one: the partnership ends and the LLC becomes disregarded, unless it has elected corporate treatment. A final Form 1065 is filed.

Plan changes for the start of a tax year where possible, so the year is not split between two tax treatments.

The filings for adding or removing members are in how to amend an LLC.

Which should you choose?

The owners decide the number of members, not the other way round. If you are going into business with someone, a multi-member LLC with a proper operating agreement is the norm. If only one of you owns the business, adding a nominal second member to change the tax treatment adds cost and filings for little benefit. See LLC operating agreement.

Owners with several businesses may want a parent LLC above them. See holding company LLCs.

Adding or removing a member?

We handle the change properly: operating agreement, EIN and tax classification, and the first partnership return if you become multi-member.

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Questions people ask

What is the main difference between a single-member and multi-member LLC?

Tax. A single-member LLC is disregarded by default and reported on the owner's return. A multi-member LLC is taxed as a partnership and files Form 1065.

Does a multi-member LLC pay tax?

Usually not itself. It files Form 1065 and each member pays tax on their share from their K-1.

Can a married couple's LLC be single-member?

In community property states, a couple owning the LLC as community property can choose disregarded or partnership treatment.

Do I need a new EIN if I add a member to my LLC?

Generally yes, because the LLC changes from a disregarded entity to a partnership.

Sources

Every fee, date and rule on this page was taken from these official and primary sources.

  1. Treasury Regulations sections 301.7701-2 and 301.7701-3: entity classification
  2. IRS Revenue Procedure 2002-69: husband and wife LLCs in community property states
  3. IRS: Instructions for Form 1065 (2025)
  4. IRS: Instructions for Form 5472 (Rev. December 2024)

Rules and fees change. If you are reading this long after September 30, 2026, confirm the figures with the source before you rely on them.

Business tax by entity typeHow LLCs are taxed: the four optionsStarting a US companyWhat is an LLC operating agreement and what should it includeFederal tax formsForm 1065: the partnership return

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This guide is general information. It is not tax or legal advice for your situation.