SEC EDGAR Release 26.3 Adds 2026q3 Fund Taxonomy and Retires 2024 XBRL Taxonomies

Key Takeaways

• The SEC upgraded EDGAR to Release 26.3 on September 14, 2026, adding support for the 2026q3 Fund (FND) taxonomy and ending acceptance of all 2024 taxonomy versions, including quarterly releases.
• Filers still using 2024 taxonomies in their XBRL submissions risk filing rejections, so compliance and reporting teams should confirm their filing tools and templates are updated.

Deep Dive

The SEC upgraded EDGAR to Release 26.3 on September 14, 2026, adding support for the 2026q3 Fund (FND) taxonomy and ending acceptance of all 2024 taxonomy versions, including quarterly releases. Filers still using 2024 taxonomies in their XBRL submissions risk filing rejections, so compliance and reporting teams should confirm their filing tools and templates are updated.

Release 26.3 makes two main changes. First, EDGAR now supports the 2026q3 FND taxonomy, which adds new elements to distinguish between portfolios within unit investment trusts registered on Forms N-8B-2 and S-6. This matters mainly for sponsors and depositors of unit investment trusts that need to report portfolio-level data. Second, the 2024 versions of 21 standard taxonomies, including quarterly releases, are no longer accepted. The affected taxonomies are U.S. GAAP, IFRS, SRT, CEF, COUNTRY, CURRENCY, CYD, DEI, ECD, EXCH, FFD, FND, NAICS, OEF, RXP, SBS, SRO, SIC, SNJ, STPR, and VIP.

The change was effective with the upgrade on September 14, 2026, and the SEC published the announcement on September 15, 2026. No grace period is described, so any submission that references a retired 2024 taxonomy should be treated as at risk of suspension or rejection. The SEC also noted that the 2025 IFRS taxonomy remains the current version for the 2026 reporting period, per IFRS Foundation guidance. IFRS filers should therefore not expect a newer IFRS taxonomy for this period.

The taxonomy list is broad. It covers financial statement reporting (U.S. GAAP, IFRS, SRT), entity and cover page data (DEI, EXCH, COUNTRY, CURRENCY), and specialized disclosures such as cybersecurity (CYD), executive compensation (ECD), filing fees (FFD), resource extraction payments (RXP), and security-based swaps (SBS). Fund complexes are affected through the CEF, OEF, FND, and VIP taxonomies. Any template, filing agent workflow, or software tool that still points to a 2024 version could fail validation.

Recommended actions:
- Inventory all XBRL filing templates, tagging software, and filing agent configurations to identify any use of 2024 taxonomy versions.
- Confirm with software vendors and filing agents that they support current taxonomy releases.
- Test upcoming submissions in advance, particularly for Forms 10-K, 10-Q, 8-K, N-CSR, and fee exhibits.
- Have unit investment trust sponsors assess whether the new FND elements apply to their N-8B-2 and S-6 related reporting.
- Document the review and update the filing calendar and controls.

The SEC strongly encourages filers to use the most recent taxonomy releases to capture current tags for new accounting standards and disclosure requirements. The main risks are operational and regulatory: rejected or delayed filings, missed deadlines, and data quality problems. The overall impact is low for filers with current tooling and moderate for those relying on legacy templates or third-party providers that have not yet updated.

Source: Securities and Exchange Commission