Arkansas tax deadlines for 2026: individual, C-corp, S-corp, and partnership returns are all due April 15, 2026 (Arkansas does not use the federal March 15 date for pass-throughs). Sales & use tax is filed monthly by the 20th.
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)
Entity Type | Filing Requirement | Due Date |
|---|---|---|
Individuals | Form AR1000F | April 15, 2026 |
Corporations (C-corp) | Form AR1100CT | April 15, 2026 |
S-Corps & Partnerships | Form AR1100S / AR1050 | April 15, 2026 |
Businesses | Sales & Use Tax | Monthly, by the 20th |
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.)