Which security credential you need depends on your buyer. ISO 27001 is an internationally recognised certification favoured by global and enterprise customers. SOC 2 is an attestation report common with United States buyers. The Essential Eight is an Australian Government baseline expected in government and regulated contexts. Ask your buyer which they require rather than guessing.
Three credentials, three different buyers
ISO 27001, SOC 2 and the Essential Eight all signal that you take security seriously, but they are not interchangeable, and pursuing the wrong one wastes time and money. The right question is not which is best in the abstract, but which one the buyer in front of you actually wants. Each is favoured by a different type of buyer, so the answer usually depends on who you are trying to sell to or satisfy.
Here is what each one is, and who tends to ask for it.
ISO 27001: the international standard
ISO 27001 is an internationally recognised certification for an information security management system. It is auditable and certifiable by an accredited body, and it is recognised across the world through international accreditation arrangements.
Who wants it: enterprise and global customers, and organisations that sell internationally. Because it is recognised everywhere, ISO 27001 is often the credential that satisfies the widest range of buyers. If your customers are large or spread across markets, ISO 27001 is frequently the one they ask for, and it tends to answer the most security questionnaires.
SOC 2: the attestation report
SOC 2 is not a certification but an attestation report, produced by an auditor, on how well your controls meet defined trust criteria. It comes in two types: Type I, a point-in-time view, and Type II, which assesses how controls operated over a period. It originated in the United States and is deeply embedded in how US companies assess vendors.
Who wants it: United States buyers, and SaaS companies selling into the US market. If your customers are American, they are more likely to ask for SOC 2 than ISO 27001, because it is the credential they know and trust. For a company focused on the US market, SOC 2 is often the priority.
Essential Eight: the Australian baseline
The Essential Eight is a set of eight mitigation strategies defined by the Australian Signals Directorate, with maturity levels that indicate how thoroughly they are implemented. It is a practical security baseline rather than a certification, and it is specifically Australian.
Who wants it: Australian Government agencies and organisations in government supply chains, along with some regulated Australian sectors. If you are bidding for government work or operating in a context where the ASD baseline is expected, the Essential Eight is what matters. It is less relevant for international commercial sales.
How to choose: ask your buyer
The single most useful piece of advice is to ask your buyer directly which credential they require, rather than assuming. Guessing is expensive, because each of these is a substantial undertaking. A quick conversation, or a look at the security questionnaire, usually reveals exactly what unlocks the deal.
As a rough guide: global or enterprise customers tend to want ISO 27001, US customers tend to want SOC 2, and Australian Government and regulated buyers tend to want the Essential Eight. But your specific buyer’s requirement always beats the general pattern.
When you need more than one
Some organisations genuinely need more than one, and the good news is they overlap. ISO 27001 and SOC 2 share a large proportion of their underlying controls, so evidence and work done for one substantially supports the other. Achieving ISO 27001 first, then adding SOC 2, is a common and efficient path for companies selling both internationally and into the US. The Essential Eight can be mapped to ISO 27001 controls as well, so an Australian company can pursue both without duplicating effort.
The point is to sequence deliberately based on your buyers, not to pursue everything at once.
Getting it right
The efficient approach is to identify what your key buyers actually require, choose the credential that unlocks the most valuable deals, and build in a way that supports adding others later if needed. That turns a confusing choice into a clear, buyer-driven decision.
If you want help deciding which credential fits your buyers and implementing it, our virtual CISO services can guide the choice and lead the work, and a security risk assessment gives you the foundation that supports whichever path you take. For the Australian baseline specifically, see our Essential Eight assessment and implementation.
For the standards, see ISO/IEC 27001 and the ASD Essential Eight.
Frequently asked questions
What is the difference between ISO 27001, SOC 2 and the Essential Eight?
ISO 27001 is an internationally recognised certification for a management system. SOC 2 is a US-originated attestation report on how well controls meet trust criteria. The Essential Eight is an Australian Government set of eight mitigation strategies with maturity levels. Each suits a different type of buyer.
Which do buyers usually want?
As a general pattern, global and enterprise customers want ISO 27001, United States customers want SOC 2, and Australian Government and regulated buyers want the Essential Eight. Your specific buyer’s requirement always beats the general pattern, so ask them directly.
Do you need more than one?
Sometimes. ISO 27001 and SOC 2 share many underlying controls, so work on one supports the other, and companies selling internationally and into the US often pursue both. The Essential Eight maps to ISO 27001 controls too. Sequence them deliberately based on your buyers.
How do you decide which to pursue?
Ask your key buyers which credential they require, then choose the one that unlocks the most valuable deals, and build in a way that supports adding others later. Guessing is expensive because each is a substantial undertaking.
