LLC Tax Classification: Which IRS Return Applies?
17 October 2026 · Educational information · No affiliate links · 3 min read
General information, not tax, legal or financial advice. We are not the IRS. Check IRS.gov or a qualified tax professional. Sources read on October 17, 2026. Dates after 2026 are expected and amounts for 2026 returns may change. This page contains no affiliate links.
Short answer: an LLC is a state-law entity; the IRS return depends on its federal tax classification. A multi-member LLC classified as a partnership files Form 1065. An LLC that elected S-corporation status (and has an accepted election) files Form 1120-S. A single-member LLC is generally not a partnership, so it does not file a 1065 on that basis.
| Classification | Typical return | Source passage |
|---|---|---|
| LLC classified as a partnership | Form 1065 | 1065 instructions: LLCs classified as partnerships have the same filing requirements as domestic partnerships |
| LLC electing S-corporation status (Form 2553 accepted and in effect) | Form 1120-S | 1120-S instructions, Who Must File |
| Single-member LLC treated as a disregarded entity | No separate entity return on that basis; the owner reports on their own return | 1065 instructions mention single-member LLCs that are disregarded entities (DEs) when they are partners |
How to read it
- "Taxed as a partnership" and "S election" are federal classifications, not LLC types. Check how your LLC was classified; this page does not tell you how to choose.
- A domestic LLC with at least two members that does not file Form 8832 is classified as a partnership for federal income tax purposes by default (Instructions for Form 1065). An LLC that wants a different classification can use Form 8832, and an eligible entity that elects S status on Form 2553 generally does not also need Form 8832 (Instructions for Form 2553).
- Filing Form 1120-S requires the election to have been accepted. Per the 1120-S instructions, if you did not receive notice of acceptance or non-acceptance within 2 months of filing Form 2553 (5 months with a letter ruling request), follow up with the IRS.
- A partner can itself be a single-member LLC that is a disregarded entity; the 1065 instructions then ask for the beneficial owner's TIN.
Deadlines
If your entity files 1065 or 1120-S, both are expected on March 15, 2027 for calendar years; see who files 1065 or 1120-S.
FAQ
Can a multi-member LLC file as a sole proprietorship? A domestic LLC with two or more members is classified as a partnership by default; a business owned and operated by spouses is generally a partnership too, unless a qualified joint venture election is made (Instructions for Form 1065).
What if the S election was never filed? The 1120-S instructions point to relief for late elections in the Form 2553 instructions; see the checklist.
What we could not verify
- Treatment of LLCs owned by spouses in community property states (not read).
- State treatment of LLCs (varies).
Sources (official)
- IRS, Instructions for Form 1065 (2025) (read October 17, 2026)
- IRS, Instructions for Form 1120-S (2025) (read October 17, 2026)