Arkansas individual, corporate, S-corporation, and partnership income tax returns for tax year 2025 are all due April 15, 2026. Unlike the federal calendar, Arkansas does not use a March 15 deadline for S-corporations and partnerships — every entity type files by April 15.

Arkansas Tax Deadlines at a Glance (2026)

Arkansas honors an accepted federal extension, so no separate state extension form is needed when a federal extension is filed; the extended individual due date is generally November 15, 2026. An extension is to file, not to pay — tax owed accrues interest and penalty from the original April 15 date. (Source: Arkansas Department of Finance and Administration.)