Updated October 26, 2026
A partnership or S corp tax extension gives your business additional time to file its federal return. However, it does not postpone any applicable tax payment deadline or automatically extend the owners’ personal tax returns.
Understanding these differences can help you prepare your records and avoid unnecessary penalties.
When Are Partnership and S Corp Tax Returns Due?
For businesses with a calendar year ending December 31, 2026, the regular federal filing deadline is March 15, 2027:
- Partnerships, including LLCs taxed as partnerships, generally file Form 1065.
- S corporations, including LLCs taxed as S corporations, generally file Form 1120-S.
These dates follow the usual federal filing rules. Different tax years or applicable IRS disaster relief may change your deadline.
What Does a Business Tax Extension Cover?
Eligible businesses can generally request a six-month filing extension using Form 7004, submitted by the original filing deadline.
For calendar-year 2026 returns, a timely, valid extension generally moves the filing deadline to September 15, 2027.
The extension provides time to complete the return accurately. It does not extend the deadline for any tax the business must pay.
Does Your Business Owe Taxes on March 15?
Partnerships and S corporations generally pass income, deductions, and credits through to their owners. Owners use Schedule K-1 information when preparing their own returns.
However, certain business-level taxes, withholding obligations, and state taxes may still apply.
Your business filing deadline and your personal payment deadlines are separate. Review both with your tax preparer before assuming that an extension gives you more time to pay.
Do Owners Need a Separate Personal Extension?
Yes, if they need additional time to file their personal returns.
A business extension does not automatically extend a partner’s or shareholder’s individual return. If your Schedule K-1 is delayed, discuss whether you need a personal extension and how to estimate any payment due.
What Should You Do Before the Deadline?
- Update your bookkeeping. Reconcile bank and credit card accounts and review unresolved transactions.
- Gather supporting records. Include payroll reports, loan balances, asset purchases, and ownership changes.
- Discuss payment obligations. Review both business and owner requirements.
- Confirm the filing plan. Know whether your preparer will submit a completed return or an extension.
- Keep your confirmation. Retain evidence that the return or extension was accepted.
Need Help Preparing Your Business Return?
At Saavedra Group, we help business owners organize their financial information and understand their tax filing responsibilities.
Contact us to discuss your partnership or S corporation tax return.
