ISO 27001 vs. TISAX®: The Ultimate Comparison for 2025

What Is the Difference Between ISO 27001 and TISAX®?

ISO 27001 or TISAX® – which standard is right for your organisation? This article explains the key differences and overlaps – and when you need one or both. It also includes practical tips on how to integrate both standards efficiently into your ISMS.

Key Takeaways

• ISO 27001 is the international gold standard for ISMS and applies across all industries.
• TISAX® is tailored to the automotive industry and widely used across Europe.
• Both standards complement each other – a dual strategy maximises market access and trust.

Why This Distinction Is Business-Critical

The cybersecurity landscape in 2025 is shaped by major regulatory change. NIS2 significantly expands the number of companies subject to mandatory cybersecurity requirements, while BSI IT-Grundschutz is evolving into IT-Grundschutz++ with the ambition to make cybersecurity measurable and automatable.

Against this backdrop, companies face a strategic decision: ISO 27001, TISAX® – or both?

This choice is not a mere technical detail. It directly affects:

• Market access (e.g. automotive OEMs, international clients)
• Competitiveness in tenders and RFPs
• Compliance evidence towards regulators, partners and investors

While ISO 27001 certifications continue to grow globally, TISAX® has become a de-facto standard in the European automotive ecosystem. The real challenge is not picking a single standard, but combining both intelligently.

Understanding the Basics: ISO 27001 and TISAX® in Detail

ISO 27001 – The International Gold Standard

• leading global standard for Information Security Management Systems (ISMS) since 2005
• maintained by the International Organization for Standardization (ISO)
• applicable across all industries, latest major revision in 2022

Core elements:

• Risk-based approach to protecting confidentiality, integrity and availability
• the PDCA cycle (Plan–Do–Check–Act) as engine for continuous improvement
• Annex A with 93 security controls as a structured control catalogue
• Flexible scope definition, from a single product or service to the entire organisation
• Certification by accredited bodies, typically valid for 3 years with annual surveillance audits
• strong marketing and trust effect, as the certificate can be used publicly in communication and sales.

TISAX® – Automotive Security Excellence

• TISAX® (Trusted Information Security Assessment Exchange)
• introduced in 2017 by the German Association of the Automotive Industry (VDA)
• managed internationally by the ENX Association

Specifics:

• originally derived from ISO 27001, now a distinct, industry-specific standard

• based on the VDA ISA questionnaire, covering:

  • general information security
  • data protection
  • prototype protection

• assessment focuses not only on implementation, but also on maturity levels (1–3)

• always covers the entire organisation – no scoped-down certification possible

• assessments may only be performed by ENX-accredited audit providers

• results are valid for up to 3 years, but:

  • no public certificate for marketing purposes
  • assessment results are shared exclusively via the ENX portal with authorised TISAX® participants (e.g. OEMs and suppliers).

Leveraging Common Ground and Synergies

Shared DNA: ISMS as the Core

Despite their differences, both standards share the same foundation: a functioning ISMS that systematically reduces information security risks.

Commonalities:

• Risk-based approach: controls are prioritised based on actual threats and business risks.
• Continuous improvement: both rely on recurring reviews and updates.
• Management responsibility: information security is a leadership task, not just an IT problem.

Technical Synergies

In practice, there is significant overlap in areas such as:

• Asset management (applications, systems, information assets)
• Access control and identity/permission concepts
• Vulnerability and patch management
• Business continuity & incident management

Synergies in implementation:

• a shared policy framework (e.g. password policy, logging, incident handling, BCP)
• common governance structures and roles (ISMS steering committee, CISO, IR team)
• one integrated GRC/ISMS platform covering both ISO 27001 and TISAX® requirements
• unified monitoring & reporting via shared dashboards for management and auditors

This makes it possible to run both standards on one integrated architecture rather than building parallel systems.

Which Standard Do You Need? – Decision Guide

Automotive Industry

For organisations active in the automotive value chain, TISAX® is essentially mandatory:

• OEMs:

  • TISAX® to meet supply chain and VDA requirements
  • ISO 27001 for additional international credibility and global partners

• Tier-1/2/3 suppliers:

  • TISAX® as prerequisite for RFQs, long-term contracts and strategic partnerships

• Service providers (IT, engineering, cloud, etc.):

  • TISAX® depending on OEM requirements
  • increasingly required when handling development data, prototypes or confidential OEM information.

Other Industries

• CRITIS sectors: ISO 27001 is often the standard of reference to demonstrate “state of the art” security and prepare for NIS2.
• B2B service providers & SaaS vendors: ISO 27001 as a strong trust signal in competitive sales and due diligence processes.
• International organisations: ISO 27001 as a globally recognised baseline standard that aligns security expectations across countries and partners.

Current Trends and Future Developments

Regulatory Developments

• NIS2 implementation massively increases the number of regulated entities and introduces new sectors to cybersecurity obligations.
• IT-Grundschutz++ aims to make cybersecurity measurable and automatable, which will impact how ISMS are designed and operated.
• In the automotive domain, UN-R155 and ISO/SAE 21434 are gaining importance as vehicle-specific cybersecurity standards complementing TISAX®.
• The upcoming EU Cyber Resilience Act will add another layer of compliance for digital products.

The direction is clear: integrated compliance across multiple standards will become the norm.

Technology Trends

• Automated compliance through AI-driven monitoring and reporting
• Cloud-native ISMS integrated directly into DevSecOps pipelines
• Machine-readable rule sets (e.g. inspired by IT-Grundschutz++) that also support automated checks for ISO 27001 and TISAX® controls
• modern GRC platforms that capture KPIs and maturity indicators once – and reuse them for ISO 27001 reporting and TISAX® assessments

As a result, it becomes increasingly feasible to operate both standards in parallel with limited additional overhead.

Step by Step to a Certifiable ISMS

With the fuentis Suite 4 ISMS Tool, you can implement both standards efficiently – ISO 27001 and TISAX® as well as IT-Grundschutz and NIS2.

• Multi-Compliance ISMS A complete ISMS solution that guides you to ISO 27001 certification while also supporting IT-Grundschutz, TISAX® and NIS2.
• Automated processes Guided workflows that lead you step by step through the certification process – even without deep prior knowledge.
• Review questionnaires Simple, customisable questionnaires that help you determine protection needs quickly and transparently.
• Personal support Experienced consultants support you from the first gap analysis through to audit preparation.

Now continue reading about NIS2 and how it interacts with ISO 27001, IT-Grundschutz and TISAX®.