Data Protection Impact Assessment (DPIA)
What is a Data Protection Impact Assessment (DPIA)?
A Data Protection Impact Assessment (DPIA) is a process carried out by a Data Controller to identify, assess, and address the privacy risks associated with a new or significantly changed data processing activity. Under Regulation (EU) 2016/679 (GDPR), a DPIA is mandatory where processing is likely to result in a high risk to the rights and freedoms of individuals.
Why It Matters
A DPIA is not simply a compliance formality — it is a structured risk management tool that helps organisations identify and mitigate privacy risks before they materialise. Carrying out a DPIA early in the design of a new processing activity allows problems to be addressed at a stage when changes are still practical and cost-effective.
Where a DPIA is required and not carried out, the organisation is in breach of the GDPR, regardless of whether any harm actually occurs. Supervisory authorities may treat the failure to conduct a required DPIA as evidence of a broader failure of accountability, increasing the likelihood and severity of enforcement action.
For organisations introducing new technologies, processing sensitive data, or conducting large-scale monitoring of individuals, understanding when and how to carry out a DPIA is a key part of GDPR compliance.
Key Requirements
When Is a DPIA Required?
A DPIA is mandatory when processing is likely to result in a high risk, particularly where:
- Large-scale processing of special categories of personal data is involved
- Systematic and extensive profiling or automated decision-making takes place
- Large-scale systematic monitoring of a publicly accessible area is conducted
This requirement applies under:
- Regulation (EU) 2016/679 – General Data Protection Regulation (GDPR), Article 35
Supervisory authorities may also publish lists of processing activities for which a DPIA is always required or never required in their jurisdiction. Controllers should consult the relevant national guidance alongside the GDPR’s own criteria.
What a DPIA Must Include
Under the GDPR, a DPIA must contain at minimum:
- A systematic description of the processing activity and its purposes
- An assessment of the necessity and proportionality of the processing
- An assessment of the risks to the rights and freedoms of data subjects
- The measures envisaged to address those risks, including safeguards and security measures
The Role of the DPO in a DPIA
Where a Data Protection Officer has been appointed, the controller is required to seek the DPO’s advice when carrying out a DPIA. The DPO’s involvement does not transfer responsibility for the assessment to the DPO — accountability remains with the controller — but their expertise is an important input into the process.
Where the DPIA identifies a high residual risk that cannot be mitigated, the controller must consult the relevant supervisory authority before proceeding with the processing activity.
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