The XBRL U.S. GAAP Taxonomy has been updated to reflect the FASB Acunting Standards dification and is effective for interim and annual periods ending after Sept.15, 2009, FASB and XBRL US announced Tuesday.

The dification, which became effective July 1, reanizes thousands of U.S. GAAP pronouncements into roughly 90 acunting ics using a nsistent structure. It also includes relevant SEC guidance that follows the same ical structure in separate sections in the dification.

A new dification extension taxonomy that inrporates the new dification references is available on the XBRL US Web Preparers using the U.S. GAAP Taxonomy to create XBRL-formatted financial statements can now link directly from the taxonomy extension to the specific dification reference as posted on FASB’s dification Web

The U.S. GAAP Taxonomy was developed by XBRL US—the nonprofit nsortium for XML business reporting standards—under ntract with the SEC as a digital dictionary ntaining a mprehensive set of reporting elements that include GAAP requirements and mmon reporting practices. 

In December, the SEC mandated the use of XBRL for all public mpanies over a three-year phase-in period. Approximately 500 of the largest public mpanies, with a worldwide public float greater than $5 billion, began filing for interim financial statements with periods ending on or after June 15, 2009.

The XBRL data, which the SEC calls “interactive data,” is required to supplement—but not replace—a mpany’s traditional electronic filing formats (ASCII or HTML) for annual and quarterly reports, transition reports for a change in fiscal year and reports that ntain updated or revised versions of financial statements. mpanies also are required to post the XBRL version on their rporate Web , if they maintain one.

All other large aelerated filers (with public floats below $5 billion that file under U.S. GAAP), are expected to start filing in XBRL next June.

In 2011, all remaining mpanies using U.S. GAAP and all foreign private issuers that prepare their financial statements in acrdance with IFRS as issued by the International Acunting Standards Board will be subject to the same requirements.

mpanies will be able to adopt interactive data earlier than their required start date. All U.S. public mpanies will have filed interactive data financial information by December 2011 for use by investors, acrding to the SEC.