Arkansas tax deadlines in 2026: filing dates and estimated payments
Deadlines that fall in calendar 2026: the 2025 return and the 2026 estimated payments. Different year? See Arkansas 2025 →
Arkansas deadlines in 2026
| 2025 individual return due | April 15, 2026 |
|---|---|
| Extended filing deadline | November 15, 2026 |
| Payment due | April 15, 2026, extension or not |
| Final 2025 estimated payment | January 15, 2026 |
| 2026 estimated payments | April 15, 2026 · June 15, 2026 · September 15, 2026 · January 15, 2027 |
Individual returns are due April 15, but Arkansas's extended filing deadline is November 15, one month past the federal October 15 extension. A valid federal extension is honored automatically (no separate state form needed). Payment is still due April 15.
Arkansas estimated tax payments in 2026
You can reasonably expect your estimated Arkansas tax (after withholding and credits) to be more than $1,000; if less than $1,000 no declaration voucher is required.
| Q1 (2026 tax year) | April 15, 2026 |
|---|---|
| Q2 (2026 tax year) | June 15, 2026 |
| Q3 (2026 tax year) | September 15, 2026 |
| Q4 (2026 tax year) | January 15, 2027 |
| Voucher | Form AR1000ES |
| Underpayment safe harbor | Estimate and pay at least 90% of the tax actually due on each quarterly due date; the 10% per annum underestimate penalty is computed on the lesser of the current year's tax liability or the previous year's tax liability (i.e., paying 100% of prior-year tax also avoids penalty). |
| Pay online | atap.arkansas.gov |
Voucher due dates printed on the 2026 AR1000ES are 04/15/2026, 06/15/2026, 09/15/2026 and 01/15/2027; weekend or holiday due dates are timely if postmarked the next business day. Farmers (2/3 of gross income from farming) may file the declaration and pay by the 15th day of the 2nd month after year end, or file the return and pay in full by the 15th day of the 3rd month. If first liable after April 15 the remaining installments are 1/3, 1/2 or all of the estimate on the next due date.
Source: dfa.arkansas.gov, read September 3, 2026. “Calendar year 2026 filers must file their Declaration of Estimated Tax on or before April 15th of the income year.”
All 51 jurisdictions in one table: state estimated tax payment dates for 2026.
Arkansas extensions
Every state's rule in one table: which states accept the federal extension in 2026.
| Does Arkansas accept the federal extension? | Yes. A federal extension is honored; no state form. |
|---|---|
| State extension form | Form AR1055-IT |
| Original due date | April 15, 2026 |
| Extended due date | November 15, 2026 |
| Payment | Still due April 15, 2026. The extension is to file, not to pay. Interest and any applicable failure-to-pay penalty are charged from the original due date until the return is filed and paid. |
| How to get it | If you filed a federal extension you do not file AR1055-IT; check the extension box on the front of the Arkansas return when you file (AR1055-IT is for a state-only extension or extension payment). |
The Department publishes the extended date as November 15; November 15, 2026 is a Sunday, so the return is due the next business day, Monday November 16, 2026. Form AR1055-IT is the individual extension form.
Source: dfa.arkansas.gov, read September 3, 2026. “The State of Arkansas will honor an accepted Federal extension, and your due date will be one month after the due date of the federal return.”
Federal deadlines in 2026
| 2025 Form 1040 | April 15, 2026 · extension October 15, 2026 |
|---|---|
| 2025 S-corp (1120-S) & partnership (1065) | March 16, 2026 |
| 2025 C-corp (Form 1120) | April 15, 2026 |
| 2026 federal estimated payments (1040-ES) | April 15, 2026 · June 15, 2026 · September 15, 2026 · January 15, 2027 |
Source: IRS Publication 509 and Form 1040-ES instructions, irs.gov.
Frequently asked questions
When are Arkansas state taxes due in 2026?
Your 2025 Arkansas individual income tax return is due April 15, 2026. If that date falls on a weekend or legal holiday, the deadline moves to the next business day. An extension moves the filing deadline to November 15, 2026, but any tax owed is still due on the original date.
When are Arkansas estimated tax payments due in 2026?
Arkansas estimated payments for the 2026 tax year are due April 15, 2026, June 15, 2026, September 15, 2026, January 15, 2027. Use Form AR1000ES or pay online. The final installment for 2025 was due January 15, 2026.
Does Arkansas accept the federal extension?
Yes. A federal extension is honored; no state form. The state form is Form AR1055-IT. The extended filing deadline is November 15, 2026, and tax is still due by April 15, 2026.
Does a Arkansas extension give me more time to pay?
No. An extension extends the time to file, not to pay. To avoid penalties and interest, pay what you expect to owe by April 15, 2026.
Dates are the statutory deadlines that fall in 2026 and move to the next business day when they land on a weekend or holiday. Each section links to the source it was checked against. Always confirm with the Arkansas tax agency or the IRS before relying on a date. This is general information, not tax advice.