TaxZerone Urges S Corps and Partnerships to File Their Extended 2025 Returns by Tomorrow’s September 15 Deadline

TaxZerone helps businesses and tax professionals e-file extended 2025 Form 1120-S and Form 1065 returns and distribute applicable Schedule K-1s.

SAN JOSE, CA, UNITED STATES, September 14, 2026 /EINPresswire.com/ -- U.S. businesses have just one day left to meet the September 15, 2026, extended federal tax filing deadline. TaxZerone, an IRS-authorized e-file provider, is urging S corporations, partnerships, and tax professionals to complete and electronically file their outstanding 2025 business tax returns before the extended deadline expires.

For Eligible calendar-year S corporations and partnerships that received a six-month extension, the additional filing time is now coming to an end. Businesses that fail to file by the applicable deadline may face IRS late-filing penalties and other consequences, depending on their circumstances.

TaxZerone helps businesses and tax professionals prepare and electronically file Form 1120-S and Form 1065, along with applicable schedules and supporting forms.

Filed Form 7004 in March? Tomorrow Is the Final Filing Day
Many calendar-year S corporations and partnerships originally had a March 16, 2026, federal filing deadline for their 2025 tax returns. Eligible businesses that timely filed Form 7004 generally received an automatic extension of time to file.

That extended filing period ends September 15, 2026.

S corporations generally file Form 1120-S, U.S. Income Tax Return for an S Corporation, while partnerships generally file Form 1065, U.S. Return of Partnership Income.

Tax professionals managing multiple client returns should review their remaining extended returns and prioritize any filings that have not yet been completed.

Waiting until the final hours can leave less time to address missing information, correct errors, or resolve filing issues before the deadline.

Businesses Should File Before the Final Hours
With only one day remaining, businesses that have not completed their returns should prioritize the following steps:
✔️ Confirm whether the business is required to file Form 1120-S or Form 1065.
✔️ Gather the financial and business information needed to complete the return.
✔️ Verify the business's EIN, legal name, address, and tax year.
✔️ Review shareholder or partner information.
✔️ Prepare applicable Schedule K-1s.
✔️ Review income, deductions, credits, and other applicable tax items.
✔️ Confirm that required schedules and supporting forms are included.
✔️ Review the completed return for missing or inconsistent information.
✔️ Submit the federal return electronically as soon as it is ready.
✔️ Retain the electronic filing confirmation and relevant tax records.

Starting the filing process earlier on September 14 can provide valuable time to address unexpected issues instead of discovering them immediately before the deadline.

What Happens If You Miss the Filing Deadline?
Failing to file by the applicable deadline, may result in IRS penalties and interest unless an exception or reasonable-cause relief applies.

For 2025 returns filed in 2026, the IRS states:
✔️ Late filing: $255 per shareholder/partner, per month or part of a month, up to 12 months.
✔️ Late payment (1120-S): 0.5% of unpaid tax per month, up to 25%.
✔️ Late filing with tax due (1120-S): Additional 5% of unpaid tax per month, up to 25%.
✔️ Late/incorrect Schedule K-1: $340 per Schedule K-1.
✔️ Intentional disregard: $680 per K-1 or 10% of the reportable amount, whichever is greater.
✔️ Interest: May accrue on unpaid tax and certain penalties.
✔️ Form 1065: The partnership generally does not pay federal income tax at the entity level; income typically passes through to the partners.

Penalty rules can vary depending on the circumstances, and certain exceptions or reasonable-cause provisions may apply.

TaxZerone Helps Businesses Complete Their Extended Returns
TaxZerone provides online e-filing solutions for businesses and tax professionals preparing their 2025 extended returns.

Businesses can use TaxZerone to:
✔️ E-file Form 1120-S for S corporations
✔️ E-file Form 1065 for partnerships
✔️ Automatically generate applicable Schedule K-1s
✔️ Securely share Schedule K-1s with applicable shareholders or partners
✔️ Complete applicable supported forms and schedules within the filing process.

Complete Your Return With Supporting Forms and Schedules
Businesses filing at the last minute may need multiple supporting forms and schedules to complete their federal return. TaxZerone supports a wide range of commonly used forms and schedules, with applicable supporting forms and attachments included at no additional cost.

Commonly supported forms include:
✔️ Form 4797 – Sales of business property
✔️ Form 4562 – Depreciation and amortization
✔️ Form 8825 – Rental real estate income and expenses
✔️ Form 1125-A – Cost of goods sold
✔️ Form 1125-E – Compensation of officers
✔️ Form 7205 – Energy Efficient Commercial Buildings Deduction
✔️ Form 8949 – Sales and other dispositions of capital assets

Additional Schedules — Form 1120-S Filers: TaxZerone also supports Schedule D (Form 1120-S), Schedule M-3 (Form 1120-S), Schedule B, Schedule K, Schedule L, Schedule M-1, Schedule M-2

Additional Schedules — Form 1065 Filers: TaxZerone also supports Schedule D (Form 1065), Schedule M-3 (Form 1065), Schedule C (Form 1065), Schedule F (Form 1040), Form 8697, Form 8866, Schedule B-1 (Form 1065), Schedule B-2 (Form 1065), Form 8825

By supporting these forms within the same filing workflow, TaxZerone can help businesses manage related federal filing requirements in one place.

Automatic Schedule K-1 Generation and Secure Delivery
For businesses required to furnish Schedule K-1s, TaxZerone helps simplify the process by generating applicable K-1s as part of the business tax filing workflow.

After completing the return, businesses can securely deliver Schedule K-1 information to applicable shareholders or partners through Secure portal (ZeroneVault) or encrypted email.

This can help businesses manage both the federal return and the associated K-1 process as they work toward the September 15 deadline.

Transparent Pricing with No Surprises
TaxZerone's flat-fee pricing structure ensures businesses won't face unexpected charges in their moment of urgency:
✔️ Form 1120-S (S Corporation): $179.99 per return
✔️ Form 1065 (Partnership): $179.99 per return
✔️ Included: Applicable schedules, supporting forms, automatic K-1 generation, and secure distribution

No subscription requirements. No additional cost. No surprise charges.

Support to Help Businesses Stay on Track
TaxZerone provides support to businesses and tax professionals throughout the federal e-filing process.

Users can access assistance through:
⭐ Live Chat Support
⭐ Email Support
⭐ Phone Support

“At TaxZerone, we’re focused on making business tax filing easier to manage. Whether you’re filing for your own business or managing returns for multiple clients, our platform and support team are available to help you navigate the e-filing process.”

Your All-in-One Solution for Year-Round Tax Filing
Beyond business tax returns, TaxZerone supports a wide range of federal tax filings used by businesses, nonprofits, and payroll providers throughout the year. These include:
☑️ Employment tax forms, including Forms 941, 940, 943, 944, and 945
☑️ Information returns such as W-2, 1099, 1098, and 5498 series, as well as ACA forms
☑️ Business Tax Forms: Form 1120-S, California Form 100S, Form 1065, California Form 565, California Form 568
☑️ Extension requests such as Forms 7004, 4868, 8868, 8809, and 15397
☑️ Nonprofit filings within the Form 990 series, Form 5227, Form 1120 POL, California Form 199, and Form 109
☑️ Excise tax filings such as Form 2290 and Form 8849
☑️ Essential forms including W-9, W-8BEN, 8655, and BOI Reports

About TaxZerone
TaxZerone is an online tax e-filing platform that provides electronic filing solutions for individuals, businesses, tax professionals, nonprofits, and other organizations. The platform supports a broad range of federal tax and information returns and is designed to simplify the tax filing process through convenient online filing tools.

To e-file business tax forms with TaxZerone, visit TaxZerone.com or call (408) 444-7120 for assistance.

Alexia Zepeda
TaxZerone LLC
+1 408-444-7120
email us here
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