This document analyzes how Apple accounts for revenue from iPhone sales under GAAP and non-GAAP methods. Under GAAP, Apple uses a subscription method to defer most revenue over 24 months. This matches Apple's obligations to buyers but understates earnings. Apple's non-GAAP method fully recognizes upfront revenue, better reflecting its business model but not following GAAP. While this benefits Apple, changing the rules for one company could set a precedent and give it an unfair advantage over competitors. On balance, GAAP subscription accounting currently provides the most reliable numbers for investors, though non-GAAP better represents Apple's economic reality.