Partnership vs S-Corp Tax Returns: Key Differences
Partnerships and S-corps are both pass-through entities, but the mechanics of each return are meaningfully different. Get the differences wrong and you either overpay or leave audit exposure.
Forms and deadlines
Partnership: Form 1065, due March 15 (calendar year), extendable to September 15.
S-corp: Form 1120-S, due March 15, extendable to September 15.
Both issue K-1s to owners for their personal returns.
Special allocations
Partnerships can specially allocate income, deductions, and credits among partners — as long as the allocations have substantial economic effect (Section 704(b)).
S-corps cannot. Everything is allocated strictly pro-rata to share ownership.
This flexibility is a major reason certain investors prefer partnerships (LLCs taxed as partnerships).
Distributions
Partnerships: distributions can generally be non-pro-rata (allowed by operating agreement).
S-corps: distributions must be strictly pro-rata to share ownership. Non-pro-rata distributions can create a 'second class of stock' problem that terminates the S-corp election.
Basis
Partners include their share of partnership debt in outside basis. This creates deduction capacity that S-corp shareholders don't have.
S-corp shareholders only get basis for direct loans they personally make to the S-corp — third-party loans don't count.
Owner compensation
Partnership: general partners take guaranteed payments (self-employment tax) and/or distributions.
S-corp: shareholder-employees take W-2 salary (payroll tax) plus distributions (no SE tax).
This is where the S-corp's self-employment tax savings comes from.
Which entity for what
Solo owner, profitable service business: S-corp usually saves self-employment tax.
Multiple owners with different capital contributions/distributions: partnership (LLC taxed as partnership) offers flexibility.
Real estate investing: partnership almost always — S-corps have painful basis and distribution rules for appreciated property.
A quick disclaimer
This article is general information for Montana small business owners, not tax, legal, or accounting advice for your specific situation. Rules change, and how they apply depends on facts we don't know about you. Before acting on anything you read here, talk to a qualified professional. If you're a Montana business owner and want a real conversation about your books, payroll, or tax, that's what Marlow Accounting is here for — call 406-290-1214 or schedule a discovery call.