An LLC does not have one universal “LLC tax return.” The tax form you file depends on how the LLC is classified for federal income tax purposes (disregarded entity, partnership, C corporation, or S corporation).

Step 1: Confirm how the LLC is taxed (this determines the return)

Single-member LLC (no corporate election)

Report the LLC’s activity on the owner’s return (commonly Schedule C, E, or F), because the LLC is generally treated as a disregarded entity for income tax purposes. A disregarded singlemember LLC is still treated as a separate entity for certain employment and excise tax filings, so it may need its own federal identification number and separate payroll or excise tax returns, even though its income is reported on the owner’s return.

Multi-member LLC (no corporate election)

File Form 1065 (partnership return) and provide Schedule K1s to members. If the partnership has items that trigger the internationalrelated reporting rules in the Form 1065 instructions, it may also need to complete and furnish Schedules K2 and K3.

LLC electing C corporation treatment

File Form 1120.

LLC electing S corporation treatment (if eligible and elected)

File Form 1120S (and provide Schedule K1s). If the S corporation has items that trigger the internationalrelated reporting rules in the Form 1120S instructions, it may also need to complete and furnish Schedules K2 and K3.

The S-election is made on Form 2553. An eligible entity that makes an effective S-election generally doesn’t need to file Form 8832 just to be treated as a corporation as of the S election effective date, but timing, lateelection relief, and corrective procedures are governed by the detailed rules in the Form 2553 instructions and related IRS guidance.

Step 2: Close your books and gather the information needed to prepare the return

At minimum, assemble income and expense totals, balance sheet items (assets, liabilities, equity), and supporting records for deductions/credits (including payroll records if you had employees). The required schedules vary by return type (for example, partnerships and S corporations generally must complete and furnish K1s and, where required under the instructions, K2/K3).

Step 3: Prepare the correct return and required schedules

Partnership (Form 1065)

Prepare Form 1065 and Schedules K and K1 (and K2/K3 if applicable based on the partnership’s facts and the Form 1065 instructions).

S corporation (Form 1120S)

Prepare Form 1120S and Schedules K and K1 (and K2/K3 if applicable based on the S corporation’s facts and the Form 1120S instructions).

C corporation (Form 1120)

Prepare Form 1120 and any required schedules/forms.

Disregarded single-member LLC

Prepare the owner’s return with the applicable schedule(s) that report the LLC activity.

Step 4: File by the due date (or extend) and use the correct filing method

How you file

You may file electronically using IRS efile options for business returns. Certain partnerships, S corporations, and C corporations are required to efile if they meet the electronic filing thresholds in current regulations and instructions (for example, the aggregate “10 or more returns of any type” rule for returns required to be filed electronically), unless an exception/waiver applies. To learn more about your particular tax situation, talk to our team of tax experts at Monily.

Extensions

Partnerships and corporations generally request an automatic extension with Form 7004 (filed by the original due date). Form 7004 extends only the time to file the return, not the time to pay any tax due, so interest and penalties can still apply if required payments are not made by the original due date.

Step 5: Pay any tax due and handle ongoing compliance items

C corporations generally pay entitylevel income tax reported on Form 1120. Partnerships and S corporations are generally passthroughs for income tax, but the entity may still have other federal filing/payment obligations (for example, payroll tax returns if it had employees). A singlemember LLC that is disregarded for income tax is still treated as a separate entity for certain employment and excise tax purposes and may have separate federal filing obligations in those areas.

State Law Note

State income/franchise tax filings and annual LLC compliance requirements are administered at the state level and can differ from federal classification rules. The controlling authority is the applicable state revenue department/tax agency (and, for LLC formation/dissolution/annual reports, typically the state business filing office).

Some states impose separate franchise, margin, or grossreceipts taxes and may treat an LLC as a taxable entity even when it is disregarded for federal income tax purposes, so always confirm the specific state’s rules. If you need professional support to ensure compliance, our tax experts are here to help.

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