This is an annual reference for professional tax preparers who file electronically through the IRS Modernized e-File (MeF) system. It covers MeF system open and close dates, original and extended filing deadlines for individual and business returns, estimated tax dates, and payroll filing dates for the 2026 filing season (tax year 2025).
This page is not a consumer tax guide. It is written for preparers who need precise, deadline-level information to manage their filing calendars, plan extension work, and avoid MeF availability conflicts. Dates are drawn from IRS announcements and Publication 509 (Tax Calendars) for 2026. Where the IRS has not yet issued a specific date, this page notes "TBA" and provides the typical historical window. Always confirm TBA dates at IRS.gov before scheduling deadline-sensitive work.
ATP is an IRS-authorized e-file transmitter and authorized CCH TaxWise reseller. Learn about ATP E-File Services.
2026 IRS MeF E-File System Schedule
The IRS Modernized e-File (MeF) system operates on a seasonal schedule with staggered opening dates for different return categories and an annual maintenance shutdown. Preparers should plan filing calendars around both the opening and the shutdown, not just the statutory deadlines.
| Event | Date | Notes |
|---|---|---|
| MeF opens: most business returns | January 13, 2026 | 9:00 a.m. ET. Covers most Form 1120, 1120-S, 1065, and related business returns. |
| MeF opens: Form 1041, 709, 1120-H | January 18, 2026 | Staggered opening; these forms became available for e-file on this date. |
| MeF opens: individual returns (Form 1040) | January 26, 2026 | 9:00 a.m. ET. IRS began accepting and processing 2025 individual returns. |
| MeF annual maintenance shutdown (2026-2027) | TBA TBA | Typically announced in October or November. Historical pattern: mid-to-late November, approximately 1-2 weeks. Check IRS.gov QuickAlerts for the current year announcement. |
What the shutdown means for preparers: During the annual MeF maintenance window, the IRS does not accept electronic submissions of any type, including current-year returns, prior-year returns, and amended returns. If a return falls due during or close to the shutdown window (the October 15 extended deadline is the most common exposure), plan to transmit well before the shutdown date. Returns that miss the electronic window must be paper-filed. ATP transmits through MeF; if MeF is down, ATP cannot process returns either.
Individual Return Deadlines (Tax Year 2025, Filed in 2026)
All dates below are for calendar-year filers. April 15 falls on a Wednesday in 2026; no shift applies. Verify any date against IRS Publication 509 for current-year confirmation, particularly if your filing situation involves a federal holiday declaration.
| Deadline | Date | Form | Notes |
|---|---|---|---|
| Original individual return deadline | April 15, 2026 | Form 1040 | Deadline for filing or requesting an extension. No shift; April 15 is a Wednesday. |
| Automatic extension request | April 15, 2026 | Form 4868 | Grants a 6-month extension to file (not to pay). Must be filed by the original deadline. No IRS approval required. |
| Extended individual return deadline | October 15, 2026 | Form 1040 (with extension) | Final deadline for individual returns on extension. No further extension is available after this date. October 15 is a Thursday. |
| U.S. citizens and residents abroad: original deadline | June 15, 2026 | Form 1040 | Automatic 2-month extension for qualifying taxpayers abroad. June 15 is a Monday; no additional shift. Interest accrues from April 15 even if this extension applies. |
| U.S. citizens and residents abroad: extended deadline | December 15, 2026 | Form 1040 (with Form 4868) | Additional 6-month extension via Form 4868 filed by June 15. December 15 is a Tuesday. |
Business Return Deadlines (Tax Year 2025)
All dates are for calendar-year filers. Extension requests for business returns are filed on Form 7004, due on the same date as the original return. Filing Form 7004 does not extend time to pay taxes owed; it extends only the time to file the return.
| Return Type | Original Deadline | Extended Deadline | Form / Notes |
|---|---|---|---|
| S-Corporations | March 16, 2026 | September 15, 2026 | Form 1120-S. March 15 falls on Sunday; deadline shifts to Monday, March 16. Extension via Form 7004 due March 16. |
| Partnerships | March 16, 2026 | September 15, 2026 | Form 1065. Same shift applies; March 15 is Sunday. Extension via Form 7004 due March 16. |
| C-Corporations | April 15, 2026 | October 15, 2026 | Form 1120. April 15 is a Wednesday. Extension via Form 7004 due April 15. |
| Trusts and Estates | April 15, 2026 | October 15, 2026 | Form 1041. April 15 is a Wednesday. Extension via Form 7004 due April 15. |
March 16 shift confirmed: March 15, 2026 falls on a Sunday. Under IRC section 7503, the deadline shifts to the next business day, Monday, March 16, 2026. This applies to both S-corp (Form 1120-S) and partnership (Form 1065) returns, as well as Form 7004 extension requests for those entities. Multiple IRS sources and CrossLink Tax confirmed this date for the 2026 filing season.
Estimated Tax Deadlines (Tax Year 2026)
These are the 2026 quarterly estimated tax payment deadlines for individuals and certain business entities paying on the installment method. These dates are for the 2026 tax year, paid during calendar year 2026 and into early 2027.
| Quarter | Due Date | Covers Income Received | Notes |
|---|---|---|---|
| Q1 2026 | April 15, 2026 | January 1 through March 31, 2026 | April 15 is a Wednesday; no shift. |
| Q2 2026 | June 15, 2026 | April 1 through May 31, 2026 | June 15 is a Monday; no shift applies. |
| Q3 2026 | September 15, 2026 | June 1 through August 31, 2026 | September 15 is a Tuesday; no shift. |
| Q4 2026 | January 15, 2027 | September 1 through December 31, 2026 | January 15, 2027 is a Friday; no shift. Taxpayers who file their 2026 return and pay all tax owed by January 31, 2027 do not need to make this payment. |
Payroll Tax Filing Deadlines
Payroll tax filing deadlines are separate from income tax return deadlines. Preparers who handle payroll tax filings for employer clients should track these dates on their own calendar. Note that deposit schedules (monthly or semi-weekly) are determined by each employer's lookback period and are separate from the filing deadlines listed here. Direct employer clients to IRS.gov Publication 15 (Circular E) for deposit schedule rules.
| Form / Filing | Due Date | Covers | Notes |
|---|---|---|---|
| Form 941 (Employer's Quarterly Federal Tax Return), Q1 | April 30, 2026 | January through March 2026 | April 30 is a Thursday; no shift. |
| Form 941, Q2 | July 31, 2026 | April through June 2026 | July 31 is a Friday; no shift. |
| Form 941, Q3 | November 2, 2026 | July through September 2026 | October 31 falls on a Saturday; deadline shifts to Monday, November 2, 2026. |
| Form 941, Q4 | February 1, 2027 | October through December 2026 | January 31, 2027 falls on a Sunday; deadline shifts to Monday, February 1, 2027. |
| Form 940 (Annual FUTA Tax Return) | February 1, 2027 | Calendar year 2026 | January 31, 2027 falls on a Sunday; deadline shifts to February 1, 2027. If all FUTA tax was deposited on time, the deadline extends to February 10. |
Deposit schedules are employer-specific. The quarterly filing deadlines above apply to the return itself. Payroll tax deposits (the actual payments) follow a separate monthly or semi-weekly schedule determined by the employer's lookback period. Some employers with large payroll liabilities are subject to next-day deposit rules. Deposit schedule errors carry their own penalties, separate from late-filing penalties. Direct employer clients to IRS Publication 15 and the IRS Tax Deposit Rules at IRS.gov for their specific deposit schedule.
Other Key Dates for Professional Preparers
The deadlines below are frequently relevant to preparers with clients who have foreign account reporting obligations, retirement plans, or preparer credential requirements of their own.
| Filing / Requirement | Date | Notes |
|---|---|---|
| FBAR (FinCEN Form 114): original deadline | April 15, 2026 | Required for U.S. persons with foreign financial accounts exceeding $10,000 at any point during the year. Filed electronically through the BSA E-Filing System, not through the IRS MeF system. |
| FBAR: automatic extension deadline | October 15, 2026 | The FBAR extension is automatic; no separate form or request is required. Form 4868 does not cover the FBAR; the FBAR extension runs independently of the income tax extension. |
| Form 5500 (Annual Return/Report of Employee Benefit Plan) | July 31, 2026 | For calendar-year plans. July 31 is a Friday; no shift. Extension to October 15, 2026 available via Form 5558. |
| PTIN renewal deadline | December 31, 2026 | PTINs must be renewed annually for the following filing year. A PTIN that is not renewed by December 31 is not valid for use on returns in the following calendar year. Renewal is completed through the IRS Tax Professional PTIN System at IRS.gov. See the PTIN guide. |
| EFIN: ongoing standing requirement | No expiration date | EFINs do not expire, but must remain in good standing throughout the filing season. Preparers must update their e-File Application if their business address, responsible officials, or return types change. See the EFIN guide. |
ATP is an IRS-Authorized E-File Transmitter
ATP transmits federal and state returns through the IRS MeF system for TaxWise users. Once your EFIN is issued, connect with ATP to register your number and start filing through a transmitter that has served independent preparers since 2001.
IRS MeF Shutdown: What Preparers Need to Know
Every year, the IRS takes the MeF system offline for a maintenance and transition period before the next filing season opens. The shutdown is not a deadline change; it is a system availability event. Understanding it is essential for preparers managing October 15 extension deadlines and prior-year amended returns in the fall.
What the Shutdown Covers
- No electronic submissions of any kind are accepted during the shutdown window. This includes current-year returns, prior-year returns, and amended returns (Form 1040-X and business amended returns).
- Acknowledgment retrieval is also limited. Returns submitted just before the shutdown may have acknowledgment records that are only accessible until the system closes completely.
- ATP transmits through MeF. If the IRS MeF system is unavailable, ATP cannot process submissions. Plan accordingly.
- Returns that must be filed during the shutdown window must be submitted on paper to avoid late-filing penalties.
Historical Pattern and 2026 Announcement
The annual MeF production shutdown typically runs for approximately one to two weeks in mid-to-late November. The IRS announces the specific shutdown date through its QuickAlerts system, typically in October or November of that year. The most recent shutdown (for the 2025-2026 cycle) closed at 11:59 a.m. ET on December 26, 2025.
The 2026-2027 shutdown date (the end-of-2026 shutdown) has not been announced as of this publication. Check the IRS QuickAlerts library at IRS.gov for the announcement when it is released, typically no later than late October.
Planning Around the Shutdown
The October 15 extended deadline for individual returns is the filing most at risk from shutdown timing. In years where the shutdown falls very close to November, a preparer who waits until October 15 to transmit extension returns has little buffer. Build a practical internal cutoff several days ahead of the IRS shutdown date, not just ahead of the statutory deadline.
Contact ATP for deadline-day transmission cutoff times. Same-day processing cutoffs can be earlier than the IRS midnight deadline, and those times may vary by transmitter. If a return transmits close to a deadline and is rejected, the IRS e-file rejection codes guide covers the most common reject codes and step-by-step resolution to get the return accepted before the deadline passes.
Frequently Asked Questions
Can I e-file after the MeF shutdown?
No. During the annual MeF maintenance shutdown, the IRS does not accept electronic submissions of any kind, including prior-year returns and amended returns. Any returns that must be filed during the shutdown window must be submitted on paper. Once the system reopens in January for the new filing season, electronic filing resumes. Plan extension-deadline work to clear before the shutdown, not up to it. The specific shutdown date for the 2026-2027 cycle has not been announced; check IRS.gov QuickAlerts for the current announcement.
What if a filing deadline falls on a weekend or federal holiday?
When a statutory filing deadline falls on a Saturday, Sunday, or federal legal holiday, the deadline shifts to the next business day. This rule is established in IRC section 7503. In 2026, this shift moves the S-corp and partnership deadline from Sunday, March 15 to Monday, March 16. The same shift moves the Form 941 Q3 deadline from Saturday, October 31 to Monday, November 2, and the Form 941 Q4 and Form 940 deadline from Sunday, January 31, 2027 to Monday, February 1, 2027. Always verify any deadline that falls near a weekend or observed federal holiday for the current tax year.
Does the October 15 extended deadline apply to all returns?
No. The October 15 extended deadline applies to individual Form 1040 returns that received a six-month automatic extension via Form 4868, and to C-corp (Form 1120) and trust/estate (Form 1041) returns extended via Form 7004. S-corps (Form 1120-S) and partnerships (Form 1065) on extension have a September 15 extended deadline, not October 15. Verify the extended deadline for each return type before assuming October 15 applies across your client list.
When does ATP stop accepting new e-file submissions?
ATP transmits through the IRS MeF system. When the IRS shuts MeF down for annual maintenance, ATP cannot process returns because the IRS system is unavailable. ATP follows the IRS shutdown schedule, which means the practical ATP cutoff is the MeF shutdown date, not the statutory filing deadline. Contact ATP directly for deadline-day cutoff times; same-day submission windows can close before the IRS midnight deadline. See ATP E-File Services for contact information.
Related Guides for Professional Preparers
- ATP E-File Transmission Services -- IRS-authorized transmitter for TaxWise users
- TaxWise Software -- IRS-approved professional tax preparation software
- How to Get an EFIN -- step-by-step EFIN application guide
- How to Get a PTIN -- PTIN registration and annual renewal
- How to Become an ERO -- Electronic Return Originator requirements and process
- IRS e-file mandate -- when preparers are required to file returns electronically