1. Default federal income tax treatment

For federal income tax purposes, a domestic singlemember LLC (SMLLC) is generally treated as a “disregarded entity,” meaning it does not file a separate federal income tax return unless it elects to be classified as a corporation. Instead, the owner reports the LLC’s income, deductions, credits, and other items directly on the owner’s federal return under the appropriate forms and schedules.

By default, a domestic LLC with only one member is disregarded as an entity separate from its owner for income tax purposes.

An individual owner of a disregarded SMLLC generally reports the LLC’s trade or business activity on Schedule C (Form 1040), Profit or Loss From Business.

If the SMLLC is engaged in farming, the individual owner generally reports that activity on Schedule F (Form 1040), Profit or Loss From Farming.

Rental real estate and royalty activities of a disregarded SMLLC owned by an individual are generally reported on Schedule E (Form 1040), Supplemental Income and Loss.

Depending on the facts, other forms and schedules (for example, for certain credits, information reporting, or special regimes) may also apply in addition to Schedules C, E, or F.

If the owner is another entity (for example, a C corporation, S corporation, partnership, or another disregarded entity), the SMLLC’s items are aggregated with and reported on that owner’s federal income tax return under the entity’s own classification.

2. Electing corporate or S corporation treatment

An SMLLC can choose not to be treated as disregarded by making an entity classification election to be taxed as a corporation.

An eligible entity (including an SMLLC) may elect to be classified as an association taxable as a corporation by filing Form 8832, Entity Classification Election, if it is otherwise classified as disregarded or as a partnership under the default rules.

A domestic corporation (including an LLC classified as a corporation) that meets the S corporation eligibility rules may then elect S corporation status by filing Form 2553, Election by a Small Business Corporation.

Under the entityclassification regulations, a timely and valid S corporation election on Form 2553 by an eligible entity is treated as an election to be classified as an association taxable as a corporation, so a separate Form 8832 is generally not required solely to support an S corporation election.

Once an SMLLC has elected to be treated as a corporation:

If it is taxed as a C corporation, it generally files Form 1120, U.S. Corporation Income Tax Return, in accordance with the Form 1120 instructions.

If it has made a valid S corporation election, it generally files Form 1120S, U.S. Income Tax Return for an S Corporation, in accordance with the Form 1120S instructions.

The Form 1120 and Form 1120S instructions clarify that an LLC files these returns only if it has elected corporate (including S corporation) status, not while it is treated as a disregarded entity.

3. Employment tax and certain excise tax treatment

Even when an SMLLC is disregarded for income tax purposes, the federal tax rules treat it as a separate entity for employment tax and certain excise tax purposes.

IRS guidance explains that, for employment taxes and certain excise taxes, an LLC with only one member is considered a separate entity from its owner, which can require its own EIN and separate filing of employment and applicable excise tax forms.

The Form SS4 instructions note that a disregarded entity must use its own name and EIN when it is required to report and pay employment or excise taxes, and they specifically direct such entities how to complete line 9a when requesting an EIN for these purposes.

Because employment and excise tax classifications are not fully “disregarded,” owners of SMLLCs need to consider these obligations separately from income tax treatment.

4. State law and other special situations

Federal classification and filing rules for SMLLCs do not control state income, franchise, or other statelevel business taxes.

IRS materials note that an LLC is formed under state law, but state income/franchise taxes and annual LLC fees or reporting obligations are determined by each state’s law and administered by state revenue departments and business filing offices.

States may conform to federal disregardedentity treatment for income tax purposes, adopt their own classifications, or impose separate LLClevel fees or minimum taxes, so owners must check the rules of the state(s) where the LLC operates or is organized.

In more complex situations, additional federal reporting may apply even when the SMLLC is disregarded for income tax purposes. Examples include:

Certain foreignowned disregarded entities may have information reporting and filing requirements (such as Form 5472) when they engage in reportable transactions with related parties.

Informationreturn, backupwithholding, or other specialized regimes can impose additional formlevel duties on disregarded entities beyond the basic incometax reporting discussed above.

These rules do not change the underlying disregardedentity classification, but they can change which forms are filed and which EIN is used. If you need professional assistance regarding your single-member LLC filing, reach out to our expert tax team.

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