Missouri candidate filing & campaign-finance deadlines
Official 2026 report due dates for Missouri state candidates file with Missouri Ethics Commission.
3 more deadlines follow in this cycle.
Electbase emails you before every deadline — 14, 7, and 2 days out — and stays current as the official schedule changes.
Get deadline remindersIncluded in every Electbase plan · See pricingThis page also covers Missouri candidate-filing (ballot access) deadlines for 2027–2028 — the process of becoming a qualified candidate, distinct from the campaign-finance reporting below. Here's how to run for office in Missouri: what to file, when, and with whom.
8 report deadlines for the 2026 cycle.
These are the campaign-finance report due dates a Missouri state candidate files with Missouri Ethics Commission for the 2026 election cycle, stored verbatim from the official schedule. The 2026 primary is Aug 4, 2026.
| Due | Type | Report | Covers |
|---|---|---|---|
| Periodic | MO January Quarterly Report Quarterly report through December 31, 2025 (mandatory for all committees). |
— – Dec 31, 2025 | |
| Periodic | MO April Quarterly Report Quarterly report through March 31, 2026. |
— – Mar 31, 2026 | |
| Periodic | MO July Quarterly Report Quarterly report through June 30, 2026 (also serves as the pre-primary quarterly). |
— – Jun 30, 2026 | |
| Pre-election | MO 8-Day Before Primary Report 8-day-before report for the August 4 primary (through July 23). Required only if the committee spent money for the election. |
— – Jul 23, 2026 | |
| Post-election | MO 30-Day After Primary Report 30-day-after report for the August 4 primary (through August 29). Required only if the committee spent money for the election. |
— – Aug 29, 2026 | |
| Periodic | MO October Quarterly Report Quarterly report through September 30, 2026 (also serves as the pre-general quarterly). |
— – Sep 30, 2026 | |
| Pre-election | MO 8-Day Before General Report 8-day-before report for the November 3 general (through October 22). Required only if the committee spent money for the election. |
— – Oct 22, 2026 | |
| Post-election | MO 30-Day After General Report 30-day-after report for the November 3 general (through November 28). Required only if the committee spent money for the election. |
— – Nov 28, 2026 |
Shaded rows are deadlines that have already passed.
Good to know
Full 2026 cycle for a state candidate committee. The four quarterly reports are mandatory for all committees; the 8-Day-Before and 30-Day-After election reports are required only if the committee spent money for that election. Missouri has NO 40-day-before report for the August 4 or November 3 elections. A low-activity committee may file a Statement of Limited Activity in lieu of a full report (except the 30-Day-After if debt exceeds $1,000). Weekend/holiday deadlines roll to the next business day EXCEPT reports due fewer than 8 days before an election. Event-driven: contributions over $5,000 (within 48 hrs) and over $250 within 12 days of an election (within 24 hrs) — not listed here.
Missouri candidate-filing deadlines — 2027–2028.
Deadlines to become a qualified candidate for office in Missouri — declarations of candidacy, nominating petitions, and related ballot-access filing requirements — compiled from Missouri Secretary of State, Elections Division. Distinct from the campaign-finance report deadlines above.
2027
County
County offices (County Clerk, County Collector, County Assessor, County Sheriff, etc.)
Candidacy method: Nonpartisan · Deadline type: Candidate filing
Files with: County election authority (County Clerk or County Election Board)
RSMo Section 115.127 - Time for filing declarations of candidacy for county and township officers · accessed Jul 13, 2026
Not yet independently verified
The filing deadline for County offices (County Clerk, County Collector, County Assessor, County Sheriff, etc.) in All Missouri counties for the 2027 Missouri County Elections (framework) is not yet a confirmed date (election not yet scheduled); check with County election authority (County Clerk or County Election Board). Source: Missouri Legislature.
Municipal
Municipal offices (Mayor, City Aldermen/Council, City Clerk, City Treasurer)
Candidacy method: Nonpartisan · Deadline type: Candidate filing
Files with: Municipal clerk or municipal election official
RSMo Section 115.127 - Time for filing declarations of candidacy for municipal officers · accessed Jul 13, 2026
Not yet independently verified
The filing deadline for Municipal offices (Mayor, City Aldermen/Council, City Clerk, City Treasurer) in All Missouri municipalities (cities and villages) for the 2027 Missouri Municipal Elections (framework) is not yet a confirmed date (election not yet scheduled); check with Municipal clerk or municipal election official. Source: Missouri Legislature.
School Board
School board members
Candidacy method: Nonpartisan · Deadline type: Candidate filing
Files with: School district clerk or election official
RSMo Section 115.306 - Qualifications of candidates for school board; filing · accessed Jul 13, 2026
Not yet independently verified
The filing deadline for School board members in All Missouri independent school districts for the 2027 Missouri School Board Elections (framework) is not yet a confirmed date (election not yet scheduled); check with School district clerk or election official. Source: Missouri Legislature.
2028
Federal
U.S. President
Filing window: –
Candidacy method: Party Primary · Deadline type: Party primary filing
Files with: Missouri Secretary of State
RSMo Section 115.349 - Time for filing of a declaration of candidacy — form of declaration · accessed Jul 13, 2026
Not yet independently verified
Filing for U.S. President in Statewide for the 2028 Missouri Primary Election (Aug 8, 2028) closes Mar 28, 2028 at 5:00 PM America/Chicago. Opens Feb 29, 2028. This date is calculated from statute and is not an official calendar date. Source: Missouri Legislature.
U.S. Senate — Class I (6-year term ending 2028)
Filing window: –
Candidacy method: Party Primary · Deadline type: Party primary filing
Files with: Missouri Secretary of State
RSMo Section 115.349 - Time for filing of a declaration of candidacy — form of declaration · accessed Jul 13, 2026
Not yet independently verified
Filing for U.S. Senate in Statewide for the 2028 Missouri Primary Election (Aug 8, 2028) closes Mar 28, 2028 at 5:00 PM America/Chicago. Opens Feb 29, 2028. This date is calculated from statute and is not an official calendar date. Source: Missouri Legislature.
U.S. House of Representatives — All districts (currently 8)
Filing window: –
Candidacy method: Party Primary · Deadline type: Party primary filing
Files with: Missouri Secretary of State
RSMo Section 115.349 - Time for filing of a declaration of candidacy — form of declaration · accessed Jul 13, 2026
Not yet independently verified
Filing for U.S. House of Representatives in Statewide for the 2028 Missouri Primary Election (Aug 8, 2028) closes Mar 28, 2028 at 5:00 PM America/Chicago. Opens Feb 29, 2028. This date is calculated from statute and is not an official calendar date. Source: Missouri Legislature.
Federal offices (President, U.S. Senate, U.S. House)
Filing window: –
Candidacy method: Independent · Deadline type: Ballot access
Petition deadline: Jul 31, 2028
Files with: Missouri Secretary of State
Signatures: Signatures of registered Missouri voters as required by RSMo § 115.329
RSMo Section 115.329 - Time for filing of petitions · accessed Jul 13, 2026
Not yet independently verified
Filing for Federal offices (President, U.S. Senate, U.S. House) in Statewide for the 2028 Missouri General Election (Nov 7, 2028) closes Jul 31, 2028 at 5:00 PM America/Chicago. Opens Nov 4, 2026. This date is calculated from statute and is not an official calendar date. Source: Missouri Legislature.
Federal offices (President, U.S. Senate, U.S. House)
Filing window: Closes
Candidacy method: Write In · Deadline type: Write-in filing
Write-in deadline: Oct 27, 2028
Files with: Missouri Secretary of State (for state/federal offices)
RSMo Section 115.453 - Procedure for counting votes for candidates · accessed Jul 13, 2026
Not yet independently verified
Filing for Federal offices (President, U.S. Senate, U.S. House) in Statewide for the 2028 Missouri General Election (Nov 7, 2028) closes Oct 27, 2028 at 5:00 PM America/Chicago. This date is calculated from statute and is not an official calendar date. Source: Missouri Legislature.
Statewide
Statewide executive offices (Governor, Attorney General, Secretary of State, State Treasurer, State Auditor)
Not yet published. Research pending: It is not yet confirmed which statewide executive offices (if any) have elections in 2028. Missouri statewide offices have 4-year terms, but the specific election years and which offices are up in 2028 must be verified from the Missouri Constitution or election authority. This placeholder record will be updated or removed based on verification.
Filing authority: Missouri Secretary of State.
Next check: Sep 1, 2026.
Missouri Constitution and RSMo Chapter 115 · accessed Jul 13, 2026
Not yet independently verified
The official filing deadline for Statewide executive offices (Governor, Attorney General, Secretary of State, State Treasurer, State Auditor) in Statewide for the 2028 Missouri General Election (Nov 7, 2028) has not yet been published; check with Missouri Secretary of State. Source: Missouri Legislature and Secretary of State.
State Legislative
Missouri State Senate and State House of Representatives — All districts
Filing window: –
Candidacy method: Party Primary · Deadline type: Party primary filing
Write-in deadline: Oct 27, 2028
Files with: Missouri Secretary of State
RSMo Section 115.349 - Time for filing of a declaration of candidacy · accessed Jul 13, 2026
Not yet independently verified
Filing for Missouri State Senate and State House of Representatives in Statewide for the 2028 Missouri General Election (Nov 7, 2028) closes Mar 28, 2028 at 5:00 PM America/Chicago. Opens Feb 29, 2028. This date is calculated from statute and is not an official calendar date. Source: Missouri Legislature.
Judicial
Missouri State Judges (Supreme Court, Court of Appeals, Circuit Judges)
Not yet published. Missouri uses the Missouri Plan (merit selection followed by retention elections) for state judges. The specific filing deadlines and procedure for judicial candidates are governed by separate provisions. Verification pending: Which judicial offices (if any) have elections in 2028, and their specific filing deadlines.
Filing authority: Missouri Secretary of State.
Next check: Sep 1, 2026.
Missouri Constitution and RSMo Chapter 115 and 115.121 · accessed Jul 13, 2026
Not yet independently verified
The official filing deadline for Missouri State Judges (Supreme Court, Court of Appeals, Circuit Judges) in Statewide for the 2028 Missouri General Election (Nov 7, 2028) has not yet been published; check with Missouri Secretary of State. Source: Missouri Legislature and Secretary of State.
Electbase compiles these dates from official state sources as a workflow aid. It is not legal advice. Confirm every deadline with your filing authority before you rely on it.
Last updated August 27, 2026