Understanding the Form 1120-S Extension
Form 1120-S is an S corporation's annual tax return. Even though most of the corporation's income passes through to its shareholders, who report it on their own returns, the corporation still has to file Form 1120-S on time. In some cases, like built-in gains or excess net passive income, the corporation also owes tax directly at the entity level.
Form 7004 is used to request the IRS for more time to file Form 1120-S when the return is not ready by its due date. When filing this form, you need to use code 25 on the form to identify Form 1120-S as the return being extended.
A timely Form 7004 automatically extends the filing deadline by 6 months. It extends the time to file Form 1120-S. It doesn't extend the deadline to pay any federal tax due.
The IRS no longer mails a separate approval notice for accepted extensions. It contacts you only if the request is disallowed.
If an LLC has made a valid election to be treated as an S corporation, it can make use of the same extension procedure and file Form 1120-S for that year; however, a different return and extension form must be used if the LLC is taxed in a different manner for federal purposes.
Form 1120-S Extension Deadlines for Tax Year 2026
Form 7004 must be sent to the IRS on or before the original due date of the return it extends. In the case of an S corporation, that date is the 15th day of the third month after the tax year ends, not the personal filing date that owners are accustomed to. If the due date falls on a weekend or a legal holiday, it is postponed to the next business day.
For the tax year 2026, a calendar-year S corporation has to file Form 1120-S by March 15, 2027. If Form 7004 is filed by that date, the deadline is moved to September 15, 2027.
| Tax Year | Form 1120-S Original Due Date | Extended Form 1120-S Due Date With Form 7004 |
|---|---|---|
| Calendar year | 15th day of the 3rd month after year end | 15th day of the 9th month after year end |
| 2026 Calendar year | March 15, 2027 | September 15, 2027 |
| Fiscal year | 15th day of the 3rd month after year end | 15th day of the 9th month after year end |
A late extension request does not protect the corporation from late-filing penalties. Only a business that qualifies for a disaster relief or another special deadline rule may be able to postpone applicable filing and payment deadlines.
A filing extension is not a payment extension.
Any federal tax owed at the entity level is still due by the Form 1120-S due date, and interest and late-payment penalties may apply to unpaid balances.
Special short-year situations
An S corporation may sometimes file Form 1120-S for a tax year shorter than 12 months. When that happens, and if the short period is because of the termination of S corporation status, the IRS does not allow Form 7004 to be electronically filed, so the extension request must be filed on paper.
Why File Form 7004 for Form 1120-S?
You don't need the final reporting amounts to apply for a Form 1120-S extension; what you do need is to file it on time and make a reasonable estimate of any tax that may be due.
Form 7004 is typically filed when an S corporation needs more time to complete its year-end bookkeeping, depreciation schedules, shareholder compensation or basis calculations, Schedule K-1 details, or when they are still waiting on information from investments, pass-through entities, transactions, or tax advisors.
| What Form 7004 Covers | Is Form 7004 required? |
|---|---|
| Form 1120-S filing deadline | Yes. A timely Form 7004 adds 6 more months to file |
| Federal tax payment | No. Pay any tax owed by the original due date |
| Schedule K-1 furnishing deadline | Generally, yes. Shareholders get Schedule K-1 by the extended Form 1120-S date |
| A shareholder's Form 1040 | No. Each shareholder extends their own return separately |
| Form 2553 S election | No. Form 7004 has no effect on the S election deadline |
| State S corporation return | State rules and deadlines vary |
Schedule K-1 timing
Since S corporations pass on their income to their shareholders, an extension also applies to the date on which they receive their Schedule K-1. However, the S corporation's Form 7004 does not extend the shareholder's individual filing or payment deadline. A shareholder who is unable to complete their individual tax return without the K-1 has to file a separate Form 4868.
What All Do You Need to File an S Corp Form 7004?
Before filling out Form 7004, you’ll need a few important details. These details must exactly match what the IRS already has on file for your business.
| Requirements | Why It's Needed |
|---|---|
| Legal business name and address | It identifies the business filing the extension |
| Employer Identification Number (EIN) | Ties the extension to the correct corporation, so verify it against a prior filed return |
| Return type and form code | Form 1120-S uses code 25 to identify the return type |
| Tax year | Confirms a calendar year or fiscal year filing, which determines your actual due date |
| Short-year reason, if applicable | Required when the tax year runs less than 12 months, such as a newly formed or dissolving corporation |
| Tentative total tax | Your estimate of what the corporation will owe, or zero, if none is expected |
| Payments and refundable credits | Any estimated payments or credits already on file with the IRS for the year |
| Balance due | Tentative tax minus payments and credits, which is what should be paid with the extension if positive |
Double-check before you submit
Verify your EIN, business name, form code, tax period, and all dollar amounts. Even a small mistake can lead to rejection or delay your extension approval.
Payment works separately
Most S corporations are not required to pay federal income tax on pass-through income at the corporate level. However, tax may apply in certain instances, such as when there are built-in gains or excess net passive income. Form 7004 does not delay payment of tax due.
One Form 7004 per return
The Form 7004 associated with Form 1120-S relates solely to that return and does not include payroll forms, separate information returns, state filings, or shareholder returns.
How to File Your Form 1120-S Extension Online With EZ Extension
EZ Extension is approved by the IRS to eFile extensions and helps you file Form 7004 step by step, checks your entries for errors, and keeps a record of your filing status. If you owe tax, you can pay the estimated amount online during the same workflow.
Enter your S corporation's details
Enter your legal business name, EIN, address, and tax period.
Add your tax details and review
Enter the tentative total tax, payments, and credits, and the resulting balance due, then check everything before you submit. Any tax due must be paid on or before the original Form 1120-S deadline.
eFile Form 7004 and track the IRS response
EZ Extension transmits the extension electronically and keeps an acknowledgment on file. You get status updates and an acknowledgment once the IRS accepts the filing.
After filing, complete Form 1120-S by the new deadline and send Schedule K-1s to shareholders at the same time. The IRS usually does not send a separate approval letter and will only contact you if the extension is denied.
Why use EZ Extension for this filing?
EZ Extension is an IRS-authorized e-file provider focused on tax extensions, with a simple guided Form 7004 workflow, downloadable filing records, real-time status updates, and secure online submission.
Form 7004 e-filing with EZ Extension starts at $9.99 for a one-time filing.
FAQs
Ready to File Your S Corp Extension?
Running out of time on Form 1120-S doesn't have to mean rushing it or falling behind. File Form 7004 with EZ Extension to add six additional months to the filing.