ISO 27001 vs SOC 2: Which One First?
ISO 27001 and SOC 2 both show customers that you take security seriously, but they work differently. Here is how to decide which one to do first.
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If you sell software or services to larger companies, sooner or later a customer will ask for proof of your security. The two names that come up most often are ISO 27001 and SOC 2. Founders and CTOs then face a practical question: which one should we do first?
There is no single right answer for every company. The choice depends on where your customers are, what they ask for in their questionnaires and how your team works. This guide compares the two in plain terms and offers a simple way to decide.
1. How the two differ
ISO/IEC 27001 is an international standard for an information security management system. An accredited certification body audits your system and, if it meets the standard, issues a certificate. The 2022 edition includes 93 controls in four themes, and you select the ones that apply through your own risk assessment.
SOC 2 is an attestation report, not a certificate. An independent CPA firm examines your controls against the Trust Services Criteria: Security, Availability, Processing Integrity, Confidentiality and Privacy. Security is always included; the others are added when they match what you promise customers. The result is a detailed report that customers usually read under a non-disclosure agreement.
| Question | ISO 27001 | SOC 2 |
|---|---|---|
| What you receive | A certificate from a certification body | A report from an independent CPA firm |
| What it is measured against | The standard and your selected controls | The Trust Services Criteria you choose |
| How customers use it | A short certificate they can check quickly | A detailed report they review in depth |
| Where it is most often asked for | Widely recognised across many regions | Very common with buyers in the United States |
| Report types | One certificate, with surveillance audits | Type 1 at a point in time, Type 2 over a period |
Both are serious pieces of work. Neither is a shortcut, and both expect the controls to operate in practice, not only on paper.
2. What your customers are really asking for
The most reliable guide is your sales pipeline. Look at the last few security questionnaires and procurement checklists you received. Did they ask for "ISO 27001 certification", "a SOC 2 Type 2 report" or simply "an independent security assessment"? Customers often tell you exactly what they need, if you read the requests carefully.
Geography matters. Enterprise buyers in the United States commonly ask for a SOC 2 report. Buyers in Europe, the Middle East and many parts of Asia, including large Indian enterprises, often recognise ISO 27001 more readily. If your customers are spread across regions, you may eventually need both.
Deal size and timing matter too. If one large prospect needs a report this year, the fastest credible route for that prospect may decide the first step. Talk to the customer’s security team. They will often accept a plan and a date if you are clear and honest about it.
3. Doing one, then the other
The good news is that the two overlap heavily. Access control, change management, risk assessment, vendor management, incident response, logging and security awareness appear in both. Work you do for one is rarely wasted on the other.
A common path for SaaS companies selling into the United States is to start with SOC 2, often a Type 1 report followed by a Type 2, and then add ISO 27001 when international customers ask for it. Companies selling mainly to European or Indian enterprises often start with ISO 27001 and add SOC 2 later. Both paths work.
Whichever you choose, build one control set rather than two separate programmes. Write policies once, map each control to both frameworks and collect evidence in a way that serves both audits. A compliance automation platform can help with this mapping, but a well-organised spreadsheet also works for a small team.
Plan the people side as well. Each framework needs owners for its controls, an internal review rhythm and leadership attention. If the same people run both, give them time in their week to do it properly. Rushing a second framework on top of the first, without extra capacity, is where many programmes stall.
Keep the end goal in view. Customers do not want a pile of certificates for their own sake. They want confidence that you protect their data. The certificate or the report is how you show that confidence in a form their procurement team accepts.
Finally, be careful with promises. Do not tell a customer you are "compliant" before the audit is complete. Say what you are doing, when you expect the report or certificate, and what you can share in the meantime, such as policies or a summary of controls. Honest updates build more trust than optimistic ones.
If you are weighing the two, our SOC 2 consulting service and ISO 27001 consulting service teams can help you read your customer requests and plan a sensible order. We are happy to talk it through.