U.S. / Business & Individual – Key 2026 U.S. Tax Deadlines
Understanding and complying with U.S. tax deadlines is essential for the e8ective management of a business and for individual tax compliance. The Internal Revenue Service (IRS) has announced that the filing season for 2025 individual income tax returns will open on January 26, 2026.
This overview provides a clear summary of the key U.S. federal tax deadlines for 2026, with particular relevance for French executives, entrepreneurs, investors, and individuals based in the United States who are subject to U.S. tax obligations due to residency, business activity, investments, or ownership interests in U.S. entities. In a cross- border context, early awareness of filing and payment deadlines remains a critical component of compliance and planning.
January 15, 2026
Payment of the 4th estimated income tax installment for tax year 2025 for self-employed individuals, independent contractors, and partners or shareholders of pass-through entities.
February 2, 2026
Filing of Forms W-2 and 1099-NEC:
- Employers must provide employees with Form W-2 and file copies with the Social Security Administration (SSA).
- Businesses must report compensation paid to independent contractors using Form 1099-NEC, and provide a copy to each recipient.
March 2, 2026
Deadline to file Forms W-2 and 1099-NEC if an extension was requested.
March 16, 2026
Filing deadline for:
- Partnerships (Form 1065)
- S Corporations (Form 1120-S) (Entities with a December 31 fiscal year-end)
April 15, 2026
- Payment of the 1st estimated income tax installment for tax year 2026 for self-employed individuals and pass-through entities.
- Filing deadline for C Corporations (Form 1120) with a December 31 year- end.
May 15, 2026
Filing deadline for tax-exempt organizations (Form 990) with a December 31 year-end.
June 15, 2026
Payment of the 2nd estimated tax installment for 2026.
September 15, 2026
- Extended filing deadline for pass-through entities.
- Payment of the 3rd estimated tax installment for 2026.
October 15, 2026
Extended filing deadline for corporate income tax returns (C Corporations).
December 15, 2026
Payment of the 4th corporate estimated tax installment for corporations with a December 31 year-end.
January 15, 2027
Payment of the 4th estimated income tax installment for tax year 2026, unless the 2026 return is filed by January 31, 2027 and the balance due is paid at that time.
Most U.S. states generally align their tax deadlines with federal IRS deadlines.
TAX DEADLINES FOR INDIVIDUALS
April 15, 2026
Filing deadline for individual income tax returns:
- Forms 1040, 1040-SR, or 1040-NR, as applicable
- Estate and trust income tax returns (Form 1041)
June 15, 2026
Filing deadline for U.S. taxpayers living and working outside the United States and Puerto Rico, including U.S. military personnel stationed abroad.
October 15, 2026
Extended filing deadline for individual income tax returns if an extension was requested.
- $5.1 trillion in federal taxes collected for the fiscal year ended September 30, 2024.
- 86% of total revenue came from individuals and payroll taxes:
- Individuals: $2.8 trillion
- Businesses: $565 billion
- Payroll taxes: $1.7 trillion
- $552.7 billion in tax refunds issued by the IRS.
- 267 million tax returns and information forms processed.
- Individual income tax returns represent approximately two-thirds of all filings.
French founders, executives, and business owners operating in the United States face unique compliance and planning challenges. Meeting U.S. tax deadlines is not only a compliance requirement but also a strategic consideration, particularly in an international context involving subsidiaries, holding structures, independent activities, or non-profit organizations.
A well-structured tax calendar supports compliance, cash-flow management, and risk mitigation in a complex regulatory environment.
Anticipate rather than correct
Effective management of tax deadlines helps avoid penalties and interest while supporting sound tax planning—especially in a cross-border environment.
For French executives, entrepreneurs, and individuals based in the United States, tailored guidance can help secure U.S. tax compliance while addressing broader international tax considerations between France and the United States.
Mathieu Aimlon, CPA
French-trained certified public accountant (non-registered in France), expert- comptable diplômé, founder of Aimlon CPA P.C., specializing in accounting, audit, and tax services for businesses, non-profit organizations, and individuals in the United States and France.
This article was originally published in the newsletter of the European American Chamber of Commerce – New York.
