IBM's Q3 2026 software revenue, which accounts for roughly 45% of total sales and features about 80% recurring revenue, faces scrutiny following the company's October 2026 guidance cut. Customers shifted budgets toward AI infrastructure hardware, deferring mainframe-linked software licenses and causing Q2 software growth to slow to 5% with flat organic results and a $400-500 million shortfall. Management lowered full-year constant-currency revenue growth to 4-5% and software growth to 6-8%, citing persistent hardware-first spending patterns. Traders will focus on whether Q3 shows transaction processing recovery, Red Hat acceleration, and closure of deferred deals ahead of the October 21 earnings release, where total revenue consensus sits near $16.3-16.8 billion.