ISO 27001 vs SOC 2, from the ISO side
Written for the reader who is already on the ISO path. The question is rarely which standard is better. It is whether a SOC 2 report is worth adding, how much of the ISMS you can reuse, and in what order to do them.
If you already hold ISO 27001, or you are part way through building the management system, adding SOC 2 is usually a three to five month project rather than a second full program, and the audit fee lands in the range of $20,000 to $60,000 CAD depending on scope and observation period. Most of the technical evidence carries over. None of the management system does, because SOC 2 does not ask for one.
That is the practitioner's version of the comparison. If you have not committed to either yet and want the neutral framework-choice walkthrough, GetAudited covers that ground. This page assumes ISO is already on your table.
They are different kinds of object
The most common error in procurement conversations is treating these as two brands of the same thing. They are not.
ISO 27001 certifies a management system. An accredited body checks that you have defined a scope, assessed risk, selected controls, and that leadership reviews and improves the whole apparatus. The output is a one-page certificate naming the scope, valid three years.
SOC 2 is an attestation engagement performed by a CPA firm under the AICPA attestation standards. The auditor tests controls you described against the Trust Services Criteria and writes an opinion. The output is a report of several dozen pages containing the auditor's opinion, your system description, and the tests performed with any exceptions found. It is not a certificate, and nobody is SOC 2 certified regardless of what the marketing says.
| ISO 27001 | SOC 2 | |
|---|---|---|
| Output | Certificate, one page | Report, typically 40 to 100 pages |
| Issued by | Accredited certification body | CPA firm |
| Governed by | ISO/IEC 27001:2022 and accreditation rules | AICPA attestation standards and Trust Services Criteria |
| Control set | 93 Annex A controls, selected by risk | Criteria you map your own controls to |
| Management system required | Yes, that is the subject | No |
| Validity | Three years with surveillance | Covers a stated period, typically 12 months, then repeats |
| Who can read it | Anyone, it is public | Restricted use, usually under an NDA |
| Usual buyer | EU, UK, global tenders, regulated procurement | North American enterprise vendor reviews |
The distribution difference is underrated
An ISO certificate can go on your website, in a tender response and in a marketing page. A SOC 2 report is restricted-use and normally released under an NDA, one prospect at a time, which means someone in your company owns the job of sending it out. If you sell to many small buyers, the certificate is far less operational overhead. If you sell to a handful of large ones who will read every page, the report tells them more.
What carries over from an ISMS to a SOC 2
The overlap is real but it is lopsided. Roughly two thirds of the underlying control work is shared, and it is concentrated in the technical and operational layer. The management system layer, which is the expensive part of ISO, buys you nothing directly in a SOC 2 report other than confidence that the controls are actually running.
| ISO artifact | Value in a SOC 2 engagement |
|---|---|
| Access control, onboarding and offboarding records | Direct reuse, tested against the common criteria |
| Change management and SDLC records | Direct reuse |
| Logging, monitoring and incident records | Direct reuse |
| Risk assessment | Reusable, the criteria expect a risk assessment process |
| Supplier and vendor reviews | Direct reuse |
| Policies | Mostly reusable, though a SOC 2 auditor reads them against what your system description claims |
| Business continuity and backup testing | Direct reuse if availability is in scope |
| Statement of Applicability | No equivalent, not used |
| Internal audit and management review | No equivalent, not required |
| Certificate scope statement | Replaced by the system description, which you must write from scratch |
The item that consistently takes longer than teams expect is the system description. It is a narrative document describing your services, infrastructure, people, procedures and data, written by you and included in the report. Nothing in your ISO documentation is a substitute for it, and a weak one produces a weak report even when the controls are strong.
What adding SOC 2 costs and takes, from here
All figures are Canadian dollars and are ranges. Starting from a working ISMS, expect the readiness effort to be modest and the audit fee to be the main line.
| Line | Range (CAD) | Note |
|---|---|---|
| SOC 2 Type 1 audit | $15,000 to $30,000 | Point in time. Useful as a bridge while the Type 2 window runs. |
| SOC 2 Type 2 audit | $20,000 to $60,000 | Tests operation over a period, repeated annually. |
| Readiness support | $8,000 to $25,000 | Lower than a first-time engagement because the controls already run. |
| Internal effort | Tens of hours, not hundreds | Mostly the system description and criteria mapping. |
The gating item is the observation period, not the auditor. A Type 2 tests whether controls operated across a window, commonly three months at minimum and twelve months for a mature report. You cannot compress it, only start it earlier. If a deal needs evidence next quarter, a Type 1 now with a Type 2 window already running is the usual answer. For Canadian audit fee detail see SOC 2 cost in Canada, and for the certification mechanics see how SOC 2 works in Canada.
Which order to do them in
If both are coming, the order depends on which deal is real.
- ISO first, then SOC 2. Sensible when your near-term demand is European, UK or tender-driven, or when you also want ISO 42001 later, since that extends the same management system. The ISMS gives you the discipline that makes a Type 2 window pass cleanly.
- SOC 2 first, then ISO. Sensible when a North American enterprise deal is on the table this quarter. SOC 2 is faster to a first usable artifact, and the evidence you build feeds the ISO program later. You will still have to build the management system afterwards, and that is the part that takes months.
- Both at once. Only with a dedicated owner and a platform collecting evidence once for both. The saving is real, perhaps a quarter of the combined effort, and it is entirely lost if nobody is accountable for the calendar.
What settles the argument in most cases is not this page, it is asking your three largest prospects which artifact they need. Buyers are specific, and building the wrong one is the most expensive error available.
Not sure whether to add SOC 2
Tell us who is asking and what you already have in place, and we will tell you whether a report earns its cost this year.
Get matchedCommon questions
Will an ISO 27001 certificate satisfy a customer asking for SOC 2?
Sometimes, and it is worth asking. Buyers with a security team that understands both will often accept a certificate plus the Statement of Applicability and a recent penetration test. Buyers running a procurement checklist that says SOC 2 usually will not, because the person you are talking to has no authority to accept a substitute.
Can one auditor do both?
Rarely the same legal entity. SOC 2 requires a CPA firm, ISO 27001 requires an accredited certification body, and impartiality rules limit what a certification body can do alongside the audit. Some larger firms have both capabilities under one brand through separate entities. Using two suppliers is normal and not a disadvantage.
Is SOC 2 cheaper than ISO 27001?
In year one, usually yes, mainly because there is no management system to build. Across three years the gap narrows: a Type 2 report is repeated in full every year, while ISO surveillance audits are shorter and cheaper than the initial certification. See the ISO cost breakdown for the comparison line by line.
Does SOC 2 have anything like the Statement of Applicability?
No. SOC 2 has you select the Trust Services categories in scope, security plus any of availability, confidentiality, processing integrity and privacy, and then describe your own controls against the criteria. There is no prescribed control catalogue to include or exclude from, which is why two SOC 2 reports can look very different from each other.
We serve Canadian customers only. Which one do we need?
Ask them, because Canadian buyers split. Enterprises with US parents or US-trained procurement teams tend to ask for SOC 2. Public sector, health networks and companies with European ties tend to ask for ISO 27001. Neither answers Canadian privacy law, which applies on its own terms regardless of which you hold.