When Are Business Taxes Due?

If you’ve ever Googled, “When are business taxes due?” at midnight while frantically searching through spreadsheets, you’re not alone. Business tax deadlines can feel like an alphabet soup of dates and forms—especially for LLCs, S-Corps, and C-Corps. But don’t worry, we’re breaking it all down into manageable, non-headache-inducing pieces. Read on to make tax season for 2025 a little less stressful.

LLC Tax Deadline for 2025

The LLC tax deadline for 2025 depends on how your LLC is taxed. Let’s break it down:

• Single-Member LLC: If you operate a single-member LLC, your tax filing will be reported on your personal tax return. The due date for your taxes is the same as your individual tax return deadline — April 15, 2025 (or April 17, 2025, if you live in Maine or Massachusetts). Missing this deadline could mean late filing and payment penalties. So, make sure to mark your calendar!
• Multi-Member LLC (Partnership): If your LLC has multiple members and is taxed as a partnership, the tax filing deadline is earlier — March 15, 2025. Missing this deadline can result in penalties, and trust us, you don’t want the IRS knocking on your door. Pay close attention to the date and avoid costly mistakes!

S-CorpTax Deadlines for 2025

S-Corp tax deadlines for 2025 are earlier than you might expect, so be sure to mark your calendars and get prepared.

• March 15, 2025: For S-Corporations, this is the deadline for filing Form 1120S and providing shareholders with Schedule K-1. If your fiscal year doesn’t align with the calendar year, your tax filing deadline will be the 15th day of the third month after your tax year ends. Keep in mind, if you miss this deadline, you could face fines of $210 per month per shareholder. Missing a few months of this can quickly add up and could turn your beach vacation fund into tax penalties.

C-CorpTax Deadlines for 2025

C-Corp tax deadlines for 2025 are different from LLCs and S-Corps, so here’s what you need to know:

• April 15, 2025: For calendar-year C-Corps, the tax return filing deadline is April 15, 2025. C-Corporations must file Form 1120 by this date to report their income, deductions, and other necessary details. If your fiscal year doesn’t match the calendar year, the deadline will be the 15th day of the fourth month after your tax year ends. Missing this deadline could result in penalties, so be sure to stay on top of it.
• Extensions: If you need more time, C-Corps can file for an extension. Form 7004 must be submitted by April 15, 2025 to secure an automatic extension until October 15, 2025. Keep in mind, this extension is only for filing, not for paying taxes due. Taxes still need to be estimated and paid by the original due date.

Business Tax Extension Deadline for 2025

If tax season sneaks up on you, don’t panic just yet—there’s a lifeline in the form of a tax extension.

• Extension Filing Deadline: To get an automatic six-month extension to file your business taxes for 2025, you’ll need to file Form 7004 by March 15, 2025 (for LLCs and S-Corps) or April 15, 2025 (for C-Corps). This gives you until September 15, 2025 for LLCs and S-Corps or October 15, 2025 for C-Corps to submit your     final return. However, be aware that this extension is only for filing the taxes, not for paying them.
• Paying on Time: An extension to file is NOT an extension to pay any taxes owed. You’ll still need to estimate and pay any taxes by the original deadline—whether that’s March 15 for LLCs and S-Corps or April  15 for C-Corps. If you don’t pay on time, the IRS will start racking up interest and penalties on any outstanding amounts.

S-Corp and LLC Tax Extensions for 2025

S-Corp and LLC tax extensions follow the same rules. If you need more time to file, submit Form 7004 by March 15, 2025, to secure an automatic extension until September 15, 2025 for both S-Corps and LLCs.

But here’s a pro tip: don’t use the extension as an excuse to wait until the last minute to organize your taxes. Use the extra time wisely. Organize your financial records, resolve any bookkeeping issues, and ensure that all necessary documentation is in order. The earlier you start, the less stressful it will be when the final filing deadline arrives.

Business Tax Deadlines You Can’t Afford to Miss

If you’ve been thinking, “I’ll worry about taxes when they come up,” it’s time to rethink that strategy. There are some business tax deadlines that you simply cannot afford to miss. Missing them could lead to hefty fines.

Quarterly Estimated Tax Payments

If you expect to owe at least $1,000 in taxes for 2025, you’ll be required to make quarterly estimated tax payments. These are due on the following dates:

• Q1: April 15, 2025
• Q2: June 16, 2025
• Q3: September 15, 2025
• Q4: January 15, 202

If you skip these quarterly payments, the IRS could impose under payment penalties, which means you’ll owe even more money later. The IRS doesn’t care about your reasons for being late—it’s all about meeting the deadlines. So, set reminders, track your income, and make those payments on time.

Why Staying Ahead of Tax Deadlines Matters

So, why does staying ahead of business tax deadlines matter? It’s simple—missing deadlines can result in much more than just a penalty. It can lead to stress, cash flow problems, and damage your business’s reputation.

Here’s how staying on top of your deadlines can benefit you:

• Avoiding Penalties: Late filings and payments result in penalties and interest charges that pile up quickly. The longer you delay, the more you’ll owe. To avoid this, stay organized and file on time.
• Better Business Decisions: When you file your taxes on time, you ensure your business has accurate and up-to-date financial data. This allows you to make more informed decisions and avoid unpleasant surprises when it’s too late.
• Protecting Your Reputation: For LLCs, S-Corps, and C-Corps, your business’s reputation and relationships with shareholders can suffer if you miss important tax deadlines. This could affect your ability to get loans or attract potential investors.
• Stress Reduction: Staying on top of tax deadlines means less last-minute scrambling. You’ll have more time to review your filings thoroughly, organize your records, and ensure everything is in order. This reduces stress and the risk of errors.

Pro Tip: Set automated reminders in your calendar for all the important tax deadlines. That way, you won’t have to rely on memory, and you’ll always know when a deadline is approaching.

Understanding the key business tax deadlines for 2025—and staying organized—will save you time, money, and unnecessary stress. By staying on top of these deadlines, you'll avoid penalties and keep your business in good financial standing.

If you need help organizing your financial records, streamlining your bookkeeping, or ensuring everything is in order for tax season, AdaptCFO is here for you. With our support, you’ll have the tools and guidance you need to stay on track and focus on growth throughout the year.

Let’s get started—your business and your peace of mind will thank you!

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