Under the form's General Instructions, the annual report is due within four months after the end of the fiscal year it covers, a longer window than a domestic 10-K. It is organized into numbered items rather than the 10-K's Parts. Item 3.D holds the risk factors, Item 4 describes the company, Item 5 (Operating and Financial Review and Prospects) plays the role of MD&A, and Items 17 and 18 cover the financial statements. Item 16 sections cover governance topics such as the audit committee and code of ethics.
The cover page records which basis of accounting the company used: U.S. GAAP, IFRS as issued by the International Accounting Standards Board, or another framework. That choice matters. A company reporting under IFRS as issued by the IASB does not have to reconcile its results to U.S. GAAP, while one using a home-country framework must follow Item 17 or 18, which can require a reconciliation. When the financial statements follow U.S. GAAP or IFRS as issued by the IASB, the annual report must include XBRL data, so a foreign issuer's figures are machine-readable on EDGAR in the same way a domestic company's are. A 20-F filer that cannot file on time can use Form 12b-25 for an extension.