When Are U.S. Taxes Due in 2025?

If you own a business in the United States—such as an LLC you registered through Openbiz—it’s crucial to know when your taxes are filed and which deadlines you must meet to avoid penalties or suspensions. The U.S. tax system follows a clear annual schedule at both the federal and state levels, designed so that individuals, small businesses, and large corporations can fulfill their obligations in an orderly way.

Tax Calendar for 2024 Income (Filed in 2025)

Although you file in 2026, you’re reporting income and expenses from the 2025 calendar year. Here are the key dates:

• January 15, 2026
  Fourth-quarter 2025 estimated tax payment due.
• January 26, 2026
  IRS begins accepting 2025 tax returns.
• March 16, 2026
  Deadline for multi-member LLCs (Form 1065) and S-Corporations.
• April 15, 2026 (“Tax Day”)
  • Individual returns and single-member LLC returns due (Form 1040, plus Form 5472 & 1120 if applicable)
  • Last day to pay any tax owed without penalty
  • Last day to file Form 4868 to request an extension of your return
• June 15, 2026
  • Deadline for U.S. expats living abroad
  • Second estimated tax payment for 2026 due
• September 15, 2026
  Third estimated tax payment for 2026 due.
• October 15, 2026
  Final deadline to file 2025 returns if you requested an extension on April 15.

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What If You Miss a Deadline or Don’t Pay on Time?

Even with a filing extension, you must still pay any tax due by April 15. If you fail to do so, you may face:

• Late-filing penalties
• Daily interest on unpaid balances
• Difficulties renewing your business registration or maintaining bank accounts

To avoid these, plan to file and pay by each deadline—even if you believe you owe nothing. Many single-member LLCs with zero revenue still must file an informational return with the IRS.

Special Considerations for Foreign Owners of U.S. LLCs

For many Latin American entrepreneurs, owning a U.S. LLC is a way to bill in dollars and sell globally. If you’re a non-U.S. resident with an LLC, remember:

• Income reporting: You may owe no tax if you lack a U.S. business “nexus,” but you still must file returns.
• Form 5472 + 1120: Required for single-member foreign-owned LLCs—even with no income.
• Sales tax: Selling on platforms like Amazon, Etsy, or Shopify to U.S. customers can trigger collection obligations.

Staying current with the IRS and your state’s requirements protects your financial reputation, lets you open U.S. bank accounts, integrate payment platforms, and pursue future investment.

Best Practices to Remember Your Tax Dates

• Set reminders at least one month before each key deadline.
• Engage a specialist in nonresident business tax compliance.
• Keep your books organized from January 1—track income, expenses, and operations.
• Make quarterly estimated payments if you expect regular tax liabilities.
• Use shared tax calendars or automated alerts to avoid oversights.

Need Assistance?

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At Openbiz, we guide entrepreneurs across Latin America not only to register their U.S. LLC but also to keep it fully compliant year-round. Our services include:

• Preparation and filing of Forms 5472, 1120, 1040-NR
• Help with extensions and estimated payments
• Annual bookkeeping support
• Assessment of your sales tax obligations
• Personalized, Spanish-language tax consulting

U.S. tax compliance isn’t optional—but with the right information and support, it’s far easier than it first appears. Knowing your calendar keeps you on track, avoids fines, and ensures your American enterprise runs smoothly.

Ready to get started? Schedule a free call with Openbiz today and let us tailor a tax plan that fits your business.

Frequently Asked Questions About U.S. LLC Tax Deadlines

1. When are the main tax deadlines for U.S. LLCs?
U.S. LLCs must follow several key deadlines throughout the year, including estimated tax payments in January, June, and September, as well as annual filing deadlines like March 15 for partnerships and April 15 for individual or single-member LLC returns.

2. What happens if I miss a tax deadline in the United States?
Missing a deadline can result in penalties, daily interest on unpaid taxes, and potential issues with maintaining your business status, bank accounts, or registrations. Even with extensions, taxes owed must still be paid on time.

3. Do foreign-owned U.S. LLCs still need to file taxes if they have no income?
Yes. Even if there is no income, foreign-owned single-member LLCs are generally required to file informational returns such as Form 5472 and Form 1120 to remain compliant with the IRS.

4. How can I stay compliant with U.S. tax deadlines?
The best way is to keep organized financial records year-round, set reminders for key deadlines, and work with a tax specialist familiar with U.S. LLC compliance, especially if you are a foreign owner.