2026 due dates, filing frequencies, form ST-36, and official filing resources.
Monthly Kansas sales tax returns are due the 25th of the month following the period. Quarterly returns are due the 25th of the month following the period (calendar quarters). When a due date lands on a weekend or federal holiday it moves to the next business day; the 2026 calendar on this page already applies that adjustment.
Choose the calculation engine or the compliance workflow. Inspect the public examples, then bring five cases from your business.
Trace a generated sample return to its source rows. See how seller sales, marketplace activity and unresolved responsibility are separated.
Trace the sample return →Synthetic Virginia package demonstration. Review, authorization and state acceptance remain separate steps.
Evaluate sales tax compliance →Prefer to use your AI agent? Give it the evaluation brief →
See task rates and subscription prices. Public evidence is open to inspect; we confirm scope and commercial terms before a private evaluation.
Every date below comes from the state's published deadline rule (dataset 2026.07.0) and is already moved to the next business day when it lands on a weekend or federal holiday. Your account's assigned filing frequency decides which table applies.
Rule: 25th of the month following the period.
| Period | Period ends | Return due |
|---|---|---|
| January 2026 | Jan 31, 2026 | Feb 25, 2026 |
| February 2026 | Feb 28, 2026 | Mar 25, 2026 |
| March 2026 | Mar 31, 2026 | Apr 27, 2026 (moved: 2026-04-25 falls on a Saturday) |
| April 2026 | Apr 30, 2026 | May 26, 2026 (moved: 2026-05-25 is a federal holiday) |
| May 2026 | May 31, 2026 | Jun 25, 2026 |
| June 2026 | Jun 30, 2026 | Jul 27, 2026 (moved: 2026-07-25 falls on a Saturday) |
| July 2026 | Jul 31, 2026 | Aug 25, 2026 |
| August 2026 | Aug 31, 2026 | Sep 25, 2026 |
| September 2026 | Sep 30, 2026 | Oct 26, 2026 (moved: 2026-10-25 falls on a Sunday) |
| October 2026 | Oct 31, 2026 | Nov 25, 2026 |
| November 2026 | Nov 30, 2026 | Dec 28, 2026 (moved: 2026-12-25 is a federal holiday) |
| December 2026 | Dec 31, 2026 | Jan 25, 2027 |
Rule: 25th of the month following the period (calendar quarters).
| Period | Period ends | Return due |
|---|---|---|
| Q1 2026 | Mar 31, 2026 | Apr 27, 2026 (moved: 2026-04-25 falls on a Saturday) |
| Q2 2026 | Jun 30, 2026 | Jul 27, 2026 (moved: 2026-07-25 falls on a Saturday) |
| Q3 2026 | Sep 30, 2026 | Oct 26, 2026 (moved: 2026-10-25 falls on a Sunday) |
| Q4 2026 | Dec 31, 2026 | Jan 25, 2027 |
Rule: January 25 following the calendar year.
| Period | Period ends | Return due |
|---|---|---|
| Calendar year 2026 | Dec 31, 2026 | Jan 25, 2027 |
No additional state-specific filing notes are recorded for this cadence set.
The principal repository-tracked return is ST-36. Paper eligibility is taxpayer-specific; electronic filing or a waiver may control.
Tracked form version: Rev. 7-24
Paper filing posture: taxpayer specific
Prophit.ai tracks every Kansas due date above inside the return workspace, builds the period from your transaction data, and produces worksheet for portal entry and portal upload file that a reviewer approves before anything is submitted.
Need every state at once? Download the 2026 sales tax filing calendar (CSV + ICS, all states, weekend/holiday-adjusted).
Workflow support does not by itself establish registration, filing authority, credentials, agency acceptance, or tax advice. Confirm your assigned filing frequency with the state.
Monthly Kansas sales tax returns are due the 25th of the month following the period. Quarterly returns are due the 25th of the month following the period (calendar quarters). When a due date lands on a weekend or federal holiday it moves to the next business day; the 2026 calendar on this page already applies that adjustment.
Kansas assigns a filing frequency to each account. The published cadences are monthly, quarterly and annual filing; the state assigns the frequency based on tax volume and notifies the account, so confirm the assigned basis before relying on a calendar.
The Kansas return tracked here is ST-36. The principal repository-tracked return is ST-36. Paper eligibility is taxpayer-specific; electronic filing or a waiver may control.
The due date moves to the next business day. In 2026, 8 of the Kansas due dates listed on this page are adjusted for a weekend or federal holiday; each adjusted date is marked in the calendar.
Paper filing posture tracked for Kansas: taxpayer specific. The principal repository-tracked return is ST-36. Paper eligibility is taxpayer-specific; electronic filing or a waiver may control.
Reviewed and current as of October 26, 2026. Read the full Kansas sales tax guide for rates, sourcing, products, exemptions, and marketplace rules.
