Running a business is already challenging — tax filing shouldn’t make it harder. One of the most important steps in staying compliant is choosing the correct tax form for your business structure. If your business operates as an S Corporation, you will need to file Form 1120-S. If you run a Partnership, you will need to file Form 1065. 
 
Knowing which form applies to your business, what details you need to report, and how the filing process works can make tax season much smoother — and help you avoid unnecessary IRS penalties. 

Understanding Your Business Tax Filing Requirements 

Form 1120-S: U.S. Income Tax Return for an
S Corporation 

• If your company has elected S corporation status, you must file Form 1120-S annually. 
• This form reports: 
  • Business income 
  • Deductions 
  • Credits 
  • Shareholder distributions 
• S corporations pass income and losses through to shareholders, making accurate K-1 reporting essential for compliance. 

Form 1065: U.S. Return of Partnership Income 

• Partnerships, multi-member LLCs, and certain joint ventures must file Form 1065. 
• Form 1065 is an informational return. The partnership reports: 
  • Total income 
  • Expenses 
  • Deductions 
  • Credits 
• Each partner receives a Schedule K-1, which reflects their share of the business’s income or loss. The tax liability passes through to the individual partners. 

Complete Form & Schedule Support — All Included 

Business returns rarely consist of just the main form. Supporting schedules and attachments are often required to report specific transactions accurately. 

Note: All supporting forms and schedules can be attached completely FREE using TaxZerone. 

Why Choose TaxZerone for Your Business Tax Returns? 

At TaxZerone, we understand that small business owners and tax professionals need a reliable solution that handles the complexities of business tax filing without the enterprise-level price tag. Our platform is specifically designed to support S Corporations and Partnerships with all the forms and schedules you need to file accurately and on time. 

Seamless K-1 Distribution with ZeroneVault 

One of the most time-consuming aspects of business tax filing is distributing Schedule K-1 forms to shareholders and partners. TaxZerone simplifies your process by: 

• Auto-generating Schedule K-1 (Form 1120-S or Form 1065) for all shareholders and partners 
• Digital distribution through ZeroneVault- our secure document portal 
• Secure email delivery option for recipients who prefer direct access 
• Paperless and eco-friendly — no printing or stuffing envelopes. 

Amending Form 1120-S or Form 1065 

For both Form 1120-S (S Corporations) and Form 1065 (Partnerships), the amendment process generally includes: 

• Checking the “Amended Return” box on the form 
• Correcting income, deductions, credits, or allocation errors 
• Updating all affected schedules and attachments 
• Providing a clear explanation of the changes 
• Issuing corrected Schedule K-1 forms to shareholders or partners 

Not Ready to File? Request an Extension in minutes

Sometimes businesses need additional time to gather documents or finalize their numbers. So, TaxZerone offers FREE Form 7004 e-filing when you prepay for your business tax return. 

Filing Form 7004 gives you an automatic 6-month extension for your Form 1120-S or Form 1065, moving your deadline from March 16, 2026, to September 15, 2026. Filing an extension helps you avoid late-filing penalties while giving you the extra time you need to file accurately. 

Simple, Affordable Pricing 

Simply prepay your Form 1120-S filing fee of $179.99 per return with TaxZerone, and we’ll process your Form 7004 extension at no additional cost. 

No tiered pricing. No surprise fees at checkout. If you’re filing a straightforward return or a return with many supporting schedules, the flat rate is the same. 
 
What’s included in our pricing:  

 ✓ Complete Form 1120-S or Form 1065 in minutes 
 ✓ All schedules and other forms(unlimited)
 ✓ Preparation and distribution of Schedule K-1’s 
 ✓ ZeroneVault – secure document storage  
 ✓ Email and phone support  

 File with Confidence for Tax Year 2025  

TaxZerone is entirely updated for tax year 2025, includes the newest tax law changes and forms, as well as meets all IRS requirements. Our system makes sure your return is compliant, accurate, and ready for electronic filing.

Key Dates to Remember: 

• Regular Filing Deadline: March 16, 2026 
• Extended Deadline (with Form 7004): September 15, 2026 

Final Thoughts 

Don’t wait until the deadline approaches. File your Form 1120-S or Form 1065 today and experience the TaxZerone’s expert support, transparent pricing, and tools designed to make business tax filing as simple as possible.