S Corp Tax Deadline 2024-2025: When are S Corp Taxes Due?

Tax Day (April 15) isn’t the only tax deadline you should have on your calendar as a business owner. The business tax filing deadlines you need to pay attention to depend on your earnings and business structure – especially if your business is an S Corporation, a partnership, or an LLC taxed as a partnership or electing S Corp taxation. For this post, we will focus solely on S Corp taxes. However, remember that the S Corp tax deadline also aligns with the partnership tax filing due date.

So, when are S Corp taxes due? Keep reading to learn the important S Corp tax return deadline. (Not an S Corp or partnership? Find the answer to “When are business taxes due?” for other business structures).

Key Takeaways

• The S Corp tax deadline is usually March 15 for most taxpayers, or the next business day if the date falls on a weekend or holiday – so, March 17 in 2025.
• The S Corp tax due date may differ for small business owners who use a fiscal year that does not align with the calendar year.
• S Corp taxes can be filed using Form 1120-S. An extension for the S Corp tax return due date can be requested using tax Form 7004.

When is the S Corp tax filing deadline?

S Corporations are “pass-through entities,” meaning the corporation’s profits and losses are reported on the tax returns of individual shareholders. However, your S Corp must still file an information income tax return and other IRS business tax forms each tax season. Many small business owners are surprised that the tax return deadline for S corporations and LLCs electing S Corp taxation is NOT in April. (Related: Do S Corps need to make estimated tax payments?)

Businesses that are organized as S Corporations are required to file their annual income tax return by Monday, March 17, 2025, for calendar-year tax filers. Generally, by March 15 (or the next business day if the date is on a weekend or holiday), S Corps and partnerships must file IRS Form 1120-S or Form 1065, respectively. Additionally, you must attach a Schedule K-1 for each shareholder (S Corp) or partner (partnership) and send them a copy.

Note: If your business uses a fiscal year, you must file your business tax return by the 15th day of the third month following the close of your tax year. For example, if you operate on a fiscal year ending in June, your S Corp tax return due date would be September 15.

What if I can’t file by the S Corporation tax due date?

If the S Corp tax deadline caught you off guard this year – or if you recently formed your S Corp and it’s the first time you must meet the earlier S Corp filing requirement – don’t panic! You have the option to file for an S Corp tax extension. The S Corp tax return deadline for extensions is the same as for the return’s original due date – March 15 (or the 15^th day of the third month following the close of your fiscal tax year). Don’t forget, the deadline shifts to the next business day if March 15 falls on a weekend or holiday. In 2025, March 17 is the S Corp extension deadline.

If you will miss the S Corp tax due date, complete and file IRS tax Form 7004. Doing so will push the S Corporation tax deadline out six months. It’s important to remember that March 17 is the S Corp tax filing deadline this year AND the S Corp tax return extension request deadline. If the S Corp has a tax liability, it must be paid when you file for the extension. In most cases, the S Corp will not have a balance due since it is a pass-through entity, but there are select situations where a tax payment may be required.

If you want to avoid the consequences of missing your S Corp filing deadline or not paying your taxes on time, it’s essential to get your paperwork in on time. Keep reading to learn more about possible penalties.

Penalties for filing business taxes late

You may be penalized if you miss the S Corp tax return deadline. S Corps that fail to file Form 1120-S (or, for partnerships, Form 1065) by the original due date may be fined by the Internal Revenue Service (IRS). Missing the S Corp tax due date can land a hefty penalty for each month or part of the month the return is late multiplied by the number of shareholders or partners.

It is a good idea to be diligent and ensure you don’t miss the tax return due date for S corporations. Consider marking the S Corp tax deadline on your calendar or scheduling an email reminder. If you read this article after the S corporation tax deadline, a Block Advisors small business certified tax professional can help you understand your next steps to minimize IRS penalties.

More help with business tax deadlines and filing

We know it can be hard to stay on top of tax deadlines – that’s why Block Advisors is here to help. Ready to complete your business tax filing? Let our small business-certified tax pros take care of the details and alleviate the stress of S Corp tax returns for you.

Need help beyond taxes? We offer year-round small business services to help you manage your small business to-do list. Our expertise in bookkeeping, payroll, business formation, and beneficial owner reporting can take these administrative tasks off your plate so you can focus on the parts of your business you love instead.

Speak with a certified small business pro today!

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This article is for informational purposes only. The content may not constitute the most up-to-date information and should not be construed as legal advice.