District of Columbia Business Tax Extension 2026: 2025 Tax-Year Filing Guide
LLC & Partnership · S Corporation · C Corporation · Fiduciary
For calendar-year 2025 returns, District of Columbia business income-tax returns are generally due April 15, 2026, with a six-month extension generally available to October 15, 2026. The applicable return depends on the entity, including Form D-20 for corporations and Form D-30 for unincorporated businesses. Last updated: September 10, 2026.
Need a pro? Connect with a U.S.-based CPA or EA to prepare and file your DC return.
Remember, payment is still due by the original deadline. In other words, extensions only extend filing time.
District of Columbia (DC) rules depend on entity type. Next, confirm the entity’s classification, file the required extension or retain federal proof when applicable, and pay required tax by the original deadline.
District of Columbia LLC Tax Extension: Filing Details
A calendar-year partnership or LLC taxed as a partnership generally files Form D-30, when applicable, when a District of Columbia filing obligation applies. For the 2025 calendar-year return, the extended filing deadline is October 15, 2026.
In addition, the extension applies to filing time only. Therefore, pay required District of Columbia tax by the original deadline to limit penalties and interest.
The extension applies to filing time only. Pay required District of Columbia tax by the original deadline to limit penalties and interest.
District of Columbia S Corporation Tax Extension: Filing Details
For an S corporation, a calendar-year business generally files Form D-20 when it has a District of Columbia filing obligation. For the 2025 calendar-year return, the extended filing deadline is October 15, 2026.
District of Columbia C Corporation Tax Extension: Filing Details
For a C corporation, a calendar-year business generally files Form D-20 and must follow District of Columbia corporate-income-tax extension rules. For the 2025 calendar-year return, the extended filing deadline is October 15, 2026.
The extension applies to filing time only. Pay required District of Columbia tax by the original deadline to limit penalties and interest.
The extension applies to filing time only. Pay required District of Columbia tax by the original deadline to limit penalties and interest.
Fiduciary, Estate, and Trust Filing Details
Finally, a calendar-year estate or trust generally files Form D-41 when it has a District of Columbia fiduciary filing obligation. For the 2025 calendar-year return, the extended filing deadline is October 15, 2026.
Quick Reference: Deadlines and Forms
The table below provides a quick reference to District of Columbia business tax extensions.
| Entity Type | DC Return Form | Extension Method | Extended Deadline |
|---|---|---|---|
| LLC / Partnership | D-30 | Federal 6-month; FR-130 | Oct. 15, 2026 |
| S Corporation | D-20 | FR-127F | Oct. 15, 2026 |
| C Corporation | D-20 | FR-127F | Oct. 15, 2026 |
| Fiduciary / Estate / Trust | D-41 | FR-127F | Oct. 15, 2026 |
Frequently Asked Questions
Quick answers about District of Columbia business tax extensions – but always confirm the current rules with the District of Columbia Division of Taxation.
Visit DC tax agencyYes. However, the applicable entity-specific requirements listed above must be satisfied. For federal filing details, see our guide to IRS Form 7004. District of Columbia grants extensions to LLCs, partnerships, S corporations, C corporations, and fiduciaries, but the rules – including which form to file, how long the extension lasts, and the payment threshold – vary by entity type.
Generally no. In other words, pay required tax by the original deadline and confirm the current state payment rules. An extension of time to file does not extend the time to pay – failing to pay by the original deadline can result in penalties and interest, even if the return is filed within the extended window.
No. In practice, partnerships, S corporations, C corporations, and fiduciaries can use different original dates, extension periods, or forms. If you need an individual rather than business extension, see our DC individual tax extension page. For 2025 calendar-year returns filed in 2026, partnerships and LLCs taxed as partnerships get a six-month extension (Sept. 15), while the others generally get a six-month extension (Oct. 15).
Review the District of Columbia Division of Taxation guidance for the entity’s return. Additionally, the DOR publishes the most current forms. For broader business-extension guidance, see our business tax extension guide. The DOR publishes the most current forms (FR-127F, FR-130, FR-127F, etc.) and any changes to extension periods or payment thresholds.
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