General7 min read
Accredited vs non-accredited ISO certificate: what differs
An accredited ISO certificate follows an independent audit by an approved body. A non-accredited one does not. Here is when each makes sense for your business.
By Zertify Redaktion
An accredited ISO certificate is issued by a certification body that a national accreditation body has assessed and approved, usually after an independent audit of your company. A non-accredited certificate is issued without that chain of oversight, for example after a self-assessment, and it documents your own commitment rather than third-party proof.
Both can be useful. They answer different questions. This article explains where the line runs, what each type can and cannot do, and how to choose without overspending or being turned away by a customer.
What ISO does and does not do
ISO, the International Organization for Standardization, writes standards. It does not issue certificates to companies. When a company says it is "ISO certified", some other organisation has confirmed, in some way, that the company meets a standard.
Who that organisation is, and who checks it, decides whether the certificate is accredited or not.
What accreditation means
Accreditation is a layer of oversight above certification. It works in three steps:
- A certification body audits your company against a standard, such as a quality or information security management system.
- The certification body itself is assessed by a national accreditation body. Examples are SAS in Switzerland, DAkkS in Germany, Akkreditierung Austria and COFRAC in France.
- The accreditation body confirms that the certification body works competently, impartially and consistently.
For management system certification, the requirements for certification bodies are set out in ISO/IEC 17021-1. Accreditation bodies cooperate internationally, which is why an accredited certificate is usually recognised across borders.
The practical result: a third party has examined your company on site or remotely, collected evidence, and a second party has checked that the first one is qualified to do so.
What a non-accredited certificate is
A non-accredited certificate is issued by an organisation that is not accredited for that scope. There is no independent audit by an approved body behind it. The basis may be a self-assessment, a document review or a questionnaire.
This is not the same as fake. A non-accredited certificate can be honest, clearly labelled and based on a structured assessment. It becomes a problem only when it is presented as something it is not, for example as an accredited certification.
The key word is evidence. With a self-assessment, you answer the questions and you state what is true. Nobody external has verified it on site. Anyone reading the certificate should understand that.
Side by side
| Accredited certificate | Non-accredited certificate | |
|---|---|---|
| Who verifies | Independent auditors of an accredited body | Your own self-assessment, evaluated by the issuer |
| Oversight of the issuer | National accreditation body | None of this kind |
| Typical effort | Audit preparation, audit days, follow-up audits | A structured assessment, usually much shorter |
| Typical cost | Higher, with recurring audit cycles | Considerably lower |
| Recognised in tenders | Usually yes | Often not, if the tender names accreditation |
| Best used for | Contract or regulatory requirements | Structure, credibility and a first step |
We have kept the cost row qualitative on purpose. Prices vary by company size, scope and body. For a closer look at what drives the cost, see our guide to ISO certification cost.
When you need an accredited certificate
Choose accredited certification when someone else sets the rules. That is the simple test. Typical cases:
- A tender names it. Public and large private tenders often ask for certificates from accredited bodies. If the document says "accredited", a self-assessment will not qualify.
- A customer contract requires it. Large customers sometimes write certification into supplier requirements. Read the exact wording.
- A regulator expects it. Some regulated sectors expect independent, accredited verification.
- You sell into risk-sensitive supply chains. Where your customer must demonstrate its own supplier controls, an independent audit helps them.
- You need the strongest possible proof. If a failure on your side would cause serious harm to others, independent verification is worth the effort.
In all these cases, a non-accredited certificate may still help internally. It will not satisfy the requirement.
When a non-accredited certificate is enough
Many small businesses never face a formal requirement. They want something else:
- A clear, structured way to show customers that processes are documented and considered.
- A reason to look at their own quality, security or environmental practices in an organised way.
- A credible signal on a website, an offer or a pitch, without a long project.
- A first step before a possible accredited audit later.
For these goals, a self-assessment based certificate can be a sensible, proportionate choice. The condition is honest wording. You say "certified by SICE on the basis of a self-assessment", not "accredited ISO certification". Our guide on accredited or not goes deeper into how to word this.
A common trap: the unclear word "certified"
Customers often read "ISO certified" as "audited by an independent body". That is the default assumption. If your certificate is non-accredited, the assumption is wrong, and the gap can cause trouble later.
To avoid it:
- State the issuer by name.
- Say that the certificate rests on a self-assessment.
- Never use accreditation marks or logos that do not belong to your certificate.
- Do not claim compliance with a standard that you have not assessed.
- If a customer asks, answer directly. Most respect a clear answer more than a vague one.
Honesty protects you. A buyer who later discovers that a certificate was not what they assumed will question everything else you told them.
Checklist: which certificate do you need?
Work through this list before you spend money on either route.
If you tick the first three boxes and the answer is "accredited required", go to an accredited body. If the answer is "not required", the other options open up.
How Zertify fits in
Zertify issues ISO certificates based on a self-assessment. The certificates are issued by SICE, the Swiss Institute of Certification and Education. They are not accredited certifications, and we say so plainly.
The process is short. You complete an online assessment that covers the requirements of the chosen standard. The structure follows the logic of the management system clauses, from context and leadership to planning, support, operation, performance evaluation and improvement. When you pass and have paid, the certificate is issued within 4 hours.
This suits owners of small and medium businesses, agencies and start-ups who want a structured, credible document without a months-long project. It is not a replacement for an accredited audit where one is demanded. If you want to understand how a route without an audit works in detail, read our guide on ISO certification without an audit.
Next steps:
- See which standards are available on the standards overview.
- Check the fees on the pricing page.
- When you are ready, start the assessment.
If your customer or tender needs accreditation, choose an accredited body instead. Better to know that before you buy than after.
A sensible path for many small businesses
The two routes are not rivals. Some companies start with a self-assessment because it forces them to write down how they work. They fix gaps, gather records and clarify responsibilities. Later, if a customer demands accreditation, they are far better prepared for a formal audit.
The work you do for one route is rarely wasted on the other. What matters is that you choose by requirement, not by habit or by marketing pressure.
Summary
An accredited certificate means an independent audit by a body that is itself approved by a national accreditation body. A non-accredited certificate means no such chain. Use the accredited route when a tender, a contract or a regulator asks for it. Use a self-assessment based certificate when you want structure and credibility without that requirement, and describe it honestly every time.
Frequently asked questions
Is a non-accredited ISO certificate worthless?
No. It has a different purpose. It shows that a company has worked through the requirements of a standard in a structured way. It does not carry the weight of an independent audit, so it will not meet requirements that explicitly demand accreditation.
How can I tell whether a certificate is accredited?
Check whether the certificate shows the mark of a national accreditation body, and then verify the issuer in that body's public directory. If the issuer or the mark cannot be found, treat the certificate as non-accredited and ask the issuer directly.
Does Zertify issue accredited certificates?
No. Zertify certificates are issued by SICE, the Swiss Institute of Certification and Education, on the basis of a self-assessment. They are not accredited certifications. If a tender or customer requires accreditation, you need an accredited certification body.
How fast does Zertify issue a certificate?
Within 4 hours after you have passed the assessment and paid. The time you need for the assessment itself depends on your company and the standard you choose.
Can I move from a non-accredited to an accredited certificate later?
Yes. The two routes are independent, and you can book an accredited audit at any time. The documentation and processes you prepared for the self-assessment usually help you prepare for a formal audit.
