Every Brazilian founder selling software upmarket eventually faces the same fork: SOC 2 or ISO 27001. They’re not interchangeable, but they overlap enough that doing both feels redundant, until you realize different buyers ask for different things.

Buyer-driven, not auditor-driven

The first question isn’t “which framework”. It’s “what do my buyers ask for in their security questionnaire”. Pull the last 10 RFPs your sales team handled. Count the SOC 2 mentions versus ISO 27001 mentions. That’s your starting point.

For most Brazilian SaaS selling to US customers: SOC 2. For SaaS selling into European enterprise or global FT 500: ISO 27001. For regulated Brazilian buyers (banks, insurers): both, plus LGPD.

Cost and timeline

SOC 2 Type I lands faster, 30 to 60 days from kickoff. ISO 27001 takes longer because it requires a stage-1 + stage-2 audit and a documented ISMS, typically 90 to 120 days. Cost is roughly comparable when you account for the auditor fee plus internal effort.

If you can only do one, pick the one your top-three target accounts ask for. Don’t optimize for theoretical buyers.

The lift to do both

Most controls overlap. If you’ve done SOC 2 well, you’re 70% of the way to ISO 27001. The deltas are mostly documentation: ISMS scope, statement of applicability, internal audit program, management review.

Decision tree

If you’re early-stage and resources are tight: do SOC 2 Type I first, then add ISO 27001 once you’ve closed the first wave of US enterprise deals.