Form 1065 and OBBBA Updates: A 2026 Tax Filing Guide for Partnerships
Partnership tax filing can become complicated because income, losses, deductions, and credits do not stay only at the business level. They pass through to partners, making accurate reporting on Form 1065 essential. For 2026, the One Big Beautiful Bill Act (OBBBA) adds another layer of importance, as several tax rules may affect how partnerships calculate and report key items.
Form 1065 explained
Form 1065 is the IRS return used by partnerships to report annual financial activity. It includes business income, deductions, gains, losses, credits, and partner allocation details. The form does not usually create direct income tax liability for the partnership. Instead, partners receive Schedule K-1, which shows their individual share of taxable items.
Deadline for 2026
For calendar-year partnerships, Form 1065 is normally due on March 15. Since March 15, 2026, is a Sunday, the deadline moves to March 16, 2026. If the partnership cannot complete the return on time, it can request an extension by filing Form 7004, extending the due date to September 15, 2026.
For businesses that want broader filing guidance, an IRS Tax Extension Guide can help explain how different taxpayers manage filing deadlines, extensions, and compliance requirements. This is especially useful for business owners handling multiple entity types or planning ahead for tax season.
How to File a Corporate Tax Extension
Although Form 1065 applies to partnerships, it is also helpful to understand how to file a Corporate Tax Extension when managing corporate tax obligations. Corporations generally file Form 7004 to request additional time to file certain business tax returns. The process usually involves entering the company information, selecting the correct tax return type, estimating any tax liability, and submitting the form before the original deadline.
It is important to remember that a tax extension usually gives extra time to file the return, but it does not extend the time to pay any taxes due.
Who should file Form 1065?
Form 1065 applies to businesses treated as partnerships for tax purposes, including:
General partnerships
Limited partnerships
LLPs
LLCs taxed as partnerships
What should partnerships report?
A complete filing generally includes:
Business income and other income
Deductible expenses
Gains and losses
Partner capital account details
Schedule K-1 allocations
Credits and special deductions
Major OBBBA-related updates
The OBBBA does not remove the need for Form 1065, but it changes how certain tax benefits and calculations may apply.
First, partnerships may need to update their computational methods. Even if the form looks similar, the numbers behind income, deductions, and credits must reflect the latest rules.
Second, R&E expenses may receive more favorable treatment. Domestic research costs may be deducted immediately, although businesses may still choose amortization depending on their tax plan.
Third, the QBI deduction remains an important benefit for pass-through entities. Enhanced flow-through benefits may help partners reduce their individual taxable income.
Fourth, expanded depreciation rules may allow partnerships to claim larger or faster deductions on qualifying assets such as machinery, equipment, and software.
Fifth, digital asset reporting is becoming more important. Partnerships involved in crypto transactions must maintain proper records of gains, losses, holdings, and related activity.
Additional updates may apply to foreign income reporting, paid leave credits, Schedules K-2 and K-3, and capital account transparency.
To avoid filing errors, partnerships should review records early and coordinate with tax professionals.
Book a free consultation today to prepare your Form 1065 filing correctly for 2026.