The IRS says a domestic LLC with at least two members is generally classified as a partnership for federal income tax purposes unless it elects corporate treatment, while an LLC with only one member is generally treated as a disregarded entity unless it elects to be taxed as a corporation. That is the core reason the answer changes depending on how many owners the LLC has and whether it made a tax election.

If your LLC has one owner and has not elected corporate taxation, its business activity is generally reported as part of the owner’s federal income tax return rather than on a separate federal income-tax return for the LLC itself. The IRS also notes, however, that even a single-member LLC is still treated as a separate entity for employment tax and certain excise tax purposes, so “together” is true mainly for income tax, not necessarily for every federal tax obligation.

 

If your LLC has multiple members, the default federal treatment is partnership taxation. The IRS says a partnership must file an annual information return, and each partner then reports their share of the income or loss on their personal tax return. So in that case, the business return and the personal return are connected, but they are not filed together as one return.

 

If the LLC elected to be taxed as an S corporation or C corporation, the answer also becomes “not together” in the usual sense. The IRS says S corporations pass income, losses, deductions, and credits through to shareholders, who then report those items on their personal returns, while C corporations are separate taxpaying entities and their profits are taxed at the corporation level, with dividends potentially taxed again to shareholders.