What is a legitimate interest assessment (LIA) under the GDPR?

A legitimate interest assessment is the balancing test used when an organisation relies on Article 6(1)(f) GDPR as the lawful basis for processing. It weighs the identified interest against the data subject’s rights and freedoms and assesses necessity and proportionality.

How should a legitimate interest assessment be documented?

Documentation should describe the purpose and legitimate interest, explain the necessity and proportionality analysis, record the balancing of risks to individuals, and set out safeguards. The record should be retained to demonstrate compliance in the event of supervisory review.

Legitimate interest assessment

Q: When is a GDPR legitimate interest assessment required?

It is required when an organisation intends to rely on legitimate interests as the lawful basis, typically where consent, contract, or another legal basis is not suitable. Common examples include security measures such as CCTV, IT logging, or certain targeted communications to existing customers.

Read more about the GDPR legitimate interest assessment as the evaluation of a legitimate interest under the GDPR.

Glossary
Legitimate interest assessment

Explained – what does a GDPR legitimate interest assessment mean?

A legitimate interest assessment is the balancing test required when a controller seeks to justify the processing of personal data on the lawful basis of legitimate interests under article 6 1 f GDPR. The assessment weighs the identified interest against the data subject’s fundamental rights and freedoms and determines whether the processing is necessary and proportionate to achieve the purpose.

Organisations often carry out a GDPR legitimate interest assessment where there is a need to process personal data—for example for security, marketing or internal administrative purposes—whilst keeping privacy protection at the centre. The outcome may be that a legitimate interest exists, but it may also be that processing cannot rely on this lawful basis for processing personal data.

When is a GDPR legitimate interest assessment required?

The question arises when an organisation considers using legitimate interests as a lawful basis for processing personal data. This typically occurs where consent, contract or another explicit legal basis is not suitable, yet there remains a strong and legitimate business, security or service need for the processing. Many teams ask what is legitimate interest under gdpr; in short, it refers to the balancing mechanism connected to article 6 1 f gdpr.

Examples include CCTV to prevent theft, IT logging to detect attempted intrusions, or targeted communications to existing customers with information considered relevant to them, all aligned with gdpr article 6 1 f legitimate interest.

Business person surrounded by arrows, documents, lock shield and megaphone, illustrating GDPR legitimate interest assessment for marketing and data processing.

Points to consider in a legitimate interest assessment

A well-executed assessment is essential to avoid the processing being rejected during supervision by the Data Protection Agency or another Data Protection Authority. Key steps include:

Identify the legitimate interest that underpins the processing.
Assess whether the processing is necessary to achieve the purpose.
Balance the interest against the data subject’s right to the protection of personal data.
Consider whether the data are sensitive and whether additional safeguards are needed.
Assess whether a less intrusive alternative exists.
Provide clear information to the data subject about the processing and its legal basis.
Offer the data subject an opportunity to object.
Document the entire process to demonstrate that the assessment has been performed and is justified.

By following these steps, the organisation can show it has considered both organisational needs and individual privacy. This clarity also helps answer what is legitimate interest under gdpr in practice.

Legitimate interest assessment

Why is the assessment important?

The legitimate interest assessment is central to ensuring that reliance on article 6 1 f gdpr as a lawful basis for processing personal data complies with the GDPR. It enables organisations to carry out necessary processing while protecting data subjects’ rights.

A deficient assessment can render the processing unlawful, exposing the organisation to enforcement and loss of trust. Both legal analysis and practical risk evaluation are required.

Properly conducted, the assessment supports transparent and accountable processing, strengthening the organisation’s reputation and fostering trust among customers, users and other stakeholders.

It is the evaluation performed when legitimate interests are considered as a lawful basis. The purpose is to weigh the identified interest against the data subject’s rights and freedoms.

It is needed where consent, contract or another basis is not appropriate but the organisation considers that processing can rely on legitimate interests.

A correct assessment involves:

Identifying and describing the legitimate interest.
Assessing necessity and proportionality.
Analysing and balancing against the individual’s rights and risks.

Legitimate interests are the lawful basis in article 6 1 f gdpr. The assessment is the process to test whether that basis can be used in the specific case.

Flawed assessments may lead to privacy intrusions, regulatory action, fines and reduced trust among customers and partners.

The organisation should: