The Quirky Math of Partnership Income

Sarah B

When it comes to taxation, partners in a business may find the math a bit puzzling. You may discover that the amount of partnership income you’re taxed on is more than the amount that was distributed to you. That’s a quirk of taxation that lies in the way partnerships and partners are taxed.


Pass-Through Taxation

Partnerships aren’t subject to income tax at the entity level. Instead, each partner is taxed on the earnings of the partnership, even if the profits aren’t distributed.


Similarly, if a partnership incurs a loss, it’s passed through to the partners. (However, various rules may prevent partners from currently using their shares of the partnership’s losses to offset other income.)


Filing Responsibilities

A partnership must file an information return, IRS Form 1065, “U.S. Return of Partnership Income.” On this form, the partnership separately identifies income, deductions, credits and other items.


This allows partners to properly treat items that are subject to limits or other rules that could affect their treatment at the partner level. Examples of items that may require special treatment include capital gains and losses, interest expense on investment debts, and charitable contributions. Each partner receives a Schedule K-1, showing their share of partnership items for the tax year.



Basis and distribution rules ensure that partners aren’t taxed twice. A partner’s initial basis in his or her partnership interest (which varies depending on how the interest was acquired) is increased by his or her share of partnership taxable income. When that income is paid out to partners in cash, they aren’t taxed on the money if they have sufficient basis. Instead, partners reduce their basis by the amount of the distribution. If a cash distribution exceeds a partner’s basis, then the excess is taxed to the partner as a gain.


Heads Up!

Understanding the ins and outs of partnership taxation can help you avoid surprises come tax time. If you’re unsure how these rules apply to your specific situation, especially with complex items such as losses or special allocations, don’t hesitate to reach out. Contact the office for help with the math and whatever other questions you may have.

By Sarah Bolton September 9, 2025
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September 15 Individuals: Pay the third installment of 2025 estimated taxes (Form 1040-ES), if not paying income tax through withholding or not paying sufficient income tax through withholding. Calendar-year corporations: Pay the third installment of 2025 estimated income taxes, completing Form 1120-W for the corporation’s records. Calendar-year S corporations: File a 2024 income tax return (Form 1120-S) and provide each shareholder with a copy of Schedule K-1 (Form 1120S) or a substitute Schedule K-1 if an automatic six-month extension was filed. Pay any tax, interest and penalties due. Calendar-year S corporations: Make contributions for 2024 to certain employer-sponsored retirement plans if an automatic six-month extension was filed. Calendar-year partnerships: File a 2024 income tax return (Form 1065 or Form 1065-B) and provide each partner with a copy of Schedule K1 (Form 1065) or a substitute Schedule K1 if an automatic six-month extension was filed. Employers: Deposit Social Security, Medicare and withheld income taxes for August if the monthly deposit rule applies. Employers: Deposit nonpayroll withheld income tax for August if the monthly deposit rule applies. September 30 Calendar-year trusts and estates: File a 2024 income tax return (Form 1041) if an automatic five-and-a-half-month extension was filed. Pay any tax, interest and penalties due. October 10  Individuals: Report September tip income of $20 or more to employers (Form 4070).
By Sarah Bolton September 9, 2025
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