📢Time Is Running Out! E-file Form 941 (Q3-2026) today to report your quarterly payroll taxes on time.
E-File Now!📢Attention S Corporations! E-file Your 2025 Form 1120-S online and securely deliver Schedule K-1s to shareholders.
E-file your S corporation’s income tax return with ease. TaxZerone offers a secure, accurate, and IRS-authorized way to file Form 1120-S online - whether you're filing for a single S corp or managing multiple entities.
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IRS Form 1120-S is the annual income tax return filed by S corporations. It reports your company’s income, gains, losses, deductions, and credits - and it’s also used to generate Schedule K-1 for shareholders to report on their personal returns.
Form 1120-S is crucial for maintaining S corporation compliance. Late or incorrect filings can result in penalties or loss of irs S corp status.
Before you file, make sure your business qualifies:
If your business meets these criteria, you are required to file Form 1120-S to report your S Corporation’s income and distribute Schedule K-1s to shareholders for their individual tax filings.
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Filing your Form 1120-S is quick and easy - just follow these steps:
Choose Form 1120-S after login and enter corporation and shareholder details via our intuitive interface.
Input your business income, deductions, and automatically generate K-1s for shareholders.
Our built-in validation checks help ensure your return meets IRS standards before submission.
After filing, easily send K-1s digitally via ZeroneVault or by mail.
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When filing your S Corporation tax return, several crucial schedules must accompany irs 1120s form to provide a comprehensive financial and tax overview to the IRS:
Completing these schedules accurately is essential to comply with IRS regulations and helps prevent errors or delays in processing your tax return.
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If your S corp uses a fiscal year (any year ending on a month other than December), the due date is:
The 15th day of the 3rd month after your fiscal year ends.
Example:
Need more time to file Form 1120-S?
You can request an extension by filing IRS Form 7004 before the due date.
These deadlines apply if your S corporation uses a calendar year (Jan 1 – Dec 31).
| Filing Type | Deadline |
|---|---|
| File with IRS (E-file) | March 16, 2026 |
| Shareholder K-1 distribution | March 16, 2026 |
| With Extension (Form 7004) | September 15, 2026 |
Avoid costly penalties by filing on time:
If you’re unsure, contact a CPA or our support - we’ll help you avoid errors and penalties.
Not sure if you need to file irs form 1120s? Our support team can help you determine your requirements.
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|---|---|---|
| IRS-Authorized | ✅ 100% trusted by the IRS | ✅ Available |
| Built-in Error Validation | ✅ Automatic error check before submission | ⚠️Limited or manual checks |
| K-1 Generation & Delivery | ✅ Instant K-1 creation + postal & digital delivery options | ✅ Basic K-1 generation only |
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IRS 1120 Form is for C corporations, which are taxed at the corporate level. Form 1120‑S is for S corporations, where profits and losses pass through to shareholders to avoid double taxation. Foreign or domestic corporations with more than 100, or non-U.S., shareholders generally use 1120.
As an S corporation, you must file Form 1120‑S. You also issue Schedule K‑1 to each shareholder to report their share of income, deductions, or credits.
No. By default, an LLC is taxed as a sole proprietorship (single member) or partnership (multi-member). To be taxed as an S Corp, you must file Form 2553. Only then do you file Form 1120‑S, not irs tax form 1120.
Check if the IRS has accepted Form 2553 for the entity. If yes, it’s an S corporation and files Form 1120‑S. Otherwise, it’s treated as a C corporation and files 1120 irs form.
Yes. Review your IRS filings: if you filed and were approved using Form 2553, your business is an S corp. If not, or if you receive a regular corporate tax return notice, you are a C corp.
