SOC 2 vs ISO 27001: what is the difference?

SOC 2 and ISO 27001 both address information security controls, but they are architecturally different. ISO 27001 produces a certificate: issued by an accredited certification body, three-year validity, globally recognized, and publicly verifiable. SOC 2 produces an attestation report: issued by a licensed CPA firm, privately distributed, renewed annually, and standard in US enterprise markets. ISO 27001 requires a formal Information Security Management System (ISMS) with documented scope, risk assessment, and a Statement of Applicability for 93 Annex A controls. SOC 2 is organized around the AICPA Trust Services Criteria — Security (CC) is mandatory, the other four categories are optional. The control overlap is significant: CC6 (logical access controls) maps closely to ISO 27001 A.5.15–A.5.18; CC9.2 (vendor monitoring) maps to A.5.19–A.5.23; CC7 (operations) maps to ISO 27001 A.8.x controls. Organizations running both frameworks map once and reuse evidence across both rather than maintaining parallel control sets. The choice depends on where your buyers are. ISO 27001 is the expectation in EU enterprise and global markets. SOC 2 is the US market standard and is frequently required by US enterprise procurement before a contract is signed. Many organizations operating across both markets pursue both.