Understanding the difference between IRS 8879-EO and IRS 8879-S

Last updated on Dec 8, 2025

What is IRS 8879-EO?

IRS 8879-EO is a form specifically designed for electronic filing of exempt organization tax returns. This form allows an authorized officer of a tax-exempt organization to electronically sign Form 990, 990-EZ, and 990-PF. The purpose of IRS 8879-EO is to facilitate the electronic transmission of these tax returns while ensuring regulatory compliance.

1.

You may need IRS 8879-EO if:
2.

Your organization is filing Form 990, 990-EZ, or 990-PF electronically.
3.

You need to provide signature authorization for the electronic return.
4.

You are an officer of a tax-exempt organization.

Who needs to complete an IRS 8879-EO?

This form is essential for authorized personnel associated with tax-exempt organizations. It ensures that filings are both compliant and secure.

1.

Typically required for:
2.

Nonprofit organizations filing their annual tax returns electronically.
3.

Organizations that qualify under 501(c)(3) (charities), 501(c)(4), or other entities.
4.

Officers or designated officials of the organization.
5.

Tax preparers filing on behalf of the exempt organization.

When is IRS 8879-EO due?

IRS 8879-EO is due when the associated Form 990, 990-EZ, or 990-PF is electronically filed. Typically, the deadline for these forms is the 15th day of the fifth month after the end of the organization’s fiscal year. For most organizations operating on a calendar year, this means the return is due on May 15.

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What is IRS 8879-S?

IRS 8879-S is a similar form tailored specifically for S corporations. It provides an option for S corporations to file electronically while allowing signature authorization. This form is designated for use with Form 1120S, which is the tax return for an S corporation.

1.

You may need IRS 8879-S if:
2.

Your S corporation is filing Form 1120S electronically.
3.

You need authorization to electronically sign the return.
4.

You are an officer or partner within the S corporation.

Who needs to complete an IRS 8879-S?

This form is specifically needed by authorized individuals within S corporations who are responsible for filing their tax returns.

1.

Typically required for:
2.

S corporations that choose to file their tax return electronically.
3.

Shareholders who hold an ownership stake in the S corporation.
4.

Designated officers who manage the corporation’s tax filings.
5.

Tax professionals preparing the S corporation's tax return.

When is IRS 8879-S due?

The IRS 8879-S must be filed alongside the 1120S tax return when it is submitted electronically. This return is generally due on the 15th day of the third month following the end of the S corporation’s tax year, which translates to March 15 for most S corporations operating on a calendar year.

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Key differences between IRS 8879-EO and IRS 8879-S

While both forms serve the purpose of authorizing electronic tax filing, they cater to different organizational types and forms of tax returns.

1.

Main differences include:
2.

IRS 8879-EO is used for tax-exempt organizations, while IRS 8879-S is specifically for S corporations.
3.

IRS 8879-EO is associated with Forms 990, 990-EZ, and 990-PF, whereas IRS 8879-S corresponds to Form 1120S.
4.

The filing deadlines are different, with IRS 8879-EO generally due on May 15, and IRS 8879-S due on March 15.
5.

Different authorized officials are required to sign each form, as they pertain to distinct types of organizations.

Understanding potential penalties

Filing tax forms incorrectly or late can lead to significant penalties, impacting your organization's finances and reputation. Understanding these penalties is crucial for compliance and strategy.

Failure to file IRS 8879-EO alongside the required forms can result in penalties such as:

1.

Fines for late submission of Forms 990, 990-EZ, or 990-PF, which could lead to several hundred dollars per month.
2.

Increased scrutiny from the IRS, potentially affecting your organization’s tax-exempt status.
3.

Inability to claim tax-deductible contributions without up-to-date filings.

Similar to IRS 8879-EO, failing to file IRS 8879-S can incur penalties, including:

1.

Late filing penalties for Form 1120S, which can accrue monthly until the return is filed, leading to increased costs.
2.

Potential loss of S corporation status if deadlines are persistently missed.
3.

Increased tax liability contributions if the correct forms are not filed timely.

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by Iryna Marchuk

Lead Writer/Blogs Manager at airSlate

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