Form 7004, Application for Automatic Extension of Time To File Certain Business Income Tax, Information, and Other Returns, is the extension form for partnerships, S corporations, C corporations and several other business returns. Filed on time, it grants an automatic extension, generally six months, with no reason required.

Which returns it covers

Form 7004 covers many business returns, including Form 1065 for partnerships, Form 1120-S for S corporations and Form 1120 for C corporations. Each return type has a code entered on the form. Sole proprietors filing Schedule C extend their individual return with Form 4868 instead.

Filing deadline for the extension

The extension must be filed by the original due date of the return: generally March 15 for calendar-year partnerships and S corporations and April 15 for calendar-year C corporations. A late extension request is not valid.

It does not extend payment

This is the most important point. Form 7004 extends the time to file, not to pay. For a C corporation, any tax owed is still due on the original due date, and interest and late-payment penalties apply to unpaid amounts. Partnerships and S corporations usually owe no federal income tax themselves, but their owners still owe tax on their personal returns by the personal due date.

Extending the business return delays owners

When a partnership or S corporation extends, partners and shareholders receive K-1s later. If they cannot file their personal returns on time, they will need to extend too, and should estimate and pay any balance due by April 15.

Estimating before you extend

An extension is safest when it is based on a real estimate. Before filing Form 7004 we:

  1. Close the books through year end, even if some adjustments remain
  2. Estimate taxable income for the entity
  3. Estimate each owner's share for pass-throughs
  4. Calculate any C corporation balance due to pay with the extension

Good reasons to extend

Extensions are common and do not increase audit risk by themselves. They make sense when K-1s from investments are late, when books need catch-up work, or when a major transaction needs careful reporting. They do not make sense as a way to postpone a decision you can make now.

Our tax services team files extensions with estimates, and our catch-up bookkeeping guide explains how to get behind books ready.

Estimating the balance due before you extend

Because an extension does not extend the time to pay, a business owing tax should estimate its liability before the original deadline. A practical approach:

  1. Close the books for the year, even if some adjustments remain
  2. Estimate taxable income using the trial balance and last year's adjustments
  3. Subtract estimated tax payments already made
  4. Pay the estimated balance with the extension or through EFTPS

For pass-through entities that generally do not pay entity-level federal income tax, the extension still matters because owners need Schedules K-1 to complete their own returns. Owners filing their own extensions should estimate their share of income too.

After filing the extension

Use the extra time to finish adjustments, not to start bookkeeping. Set an internal deadline several weeks before the extended due date so the preparer has time to review.

Key terms

Definitions for terms used in this guide, from our small business glossary:

  • Trial Balance: A trial balance lists every account's ending balance to confirm that total debits equal total credits.
  • EFTPS: EFTPS, the Electronic Federal Tax Payment System, is a free Treasury service for making federal tax payments electronically.