Privacy Impact Assessment
A process to systematically identify and address privacy risks in a project, system, or business process.
Full Definition
A Privacy Impact Assessment (PIA) is a risk assessment tool used to identify and address privacy risks in a project, system, or process before implementation. While the term 'DPIA' (Data Protection Impact Assessment) is used specifically in GDPR, 'PIA' is a broader term used in frameworks including NIST Privacy Framework, Canada's PIPEDA, and Australia's Privacy Act. A PIA typically includes: describing the data flows and processing, identifying applicable legal requirements, assessing privacy risks, and documenting how risks will be mitigated. PIAs should be living documents, updated when significant changes occur to the processing.
How each law treats it
The GDPR uses 'DPIA' for what many jurisdictions call a PIA. The two terms are often used interchangeably.
DPIAs are mandatory for Significant Data Fiduciaries. The DPDP Rules 2025 specify scope and independent-audit touchpoints.
The ISO reference for conducting a PIA. The DPIA process in most organisations aligns to ISO 29134 even where not formally certified.
In practice
- Start the PIA at project kickoff. Running one after launch is remediation, not design.
- Consult data subjects or their representatives where appropriate — GDPR Article 35(9) requires it.
- Record the DPO's opinion as a documented step. The regulator will ask whether the DPO advised and what the advice was.
Common pitfalls
- Running the PIA as a one-shot exercise. The methodology requires it to be a living document that's reviewed if the processing changes.
- Mixing the PIA with a security risk assessment. Security is one input to the PIA, not a replacement.
- Not escalating residual high risk. GDPR Article 36 requires prior consultation with the supervisory authority before the processing starts.
Frequently asked questions
Is a PIA the same as a DPIA?+
Operationally, usually yes. GDPR uses 'DPIA'; other jurisdictions and some ISO standards prefer 'PIA'. The content and the methodology are close enough that organisations run one document for both.
Who signs off a PIA?+
The DPO's opinion is required under GDPR Article 35(2). Senior management typically signs off the final document — the auditor will ask for both signatures.
What's the PIA cadence?+
At kickoff, again before launch, and whenever the processing changes materially. Many DPOs run an annual review of all live PIAs as part of the privacy programme.
Related terms
DPIA
Data Protection Impact Assessment — a systematic process to identify and minimise privacy risks in new processing activities.
Data Minimisation
The principle that only personal data that is adequate, relevant, and limited to what is necessary should be collected and processed.
Privacy by Design
An approach that embeds privacy protections into the design and architecture of systems and processes from the outset.
Relevant regulations
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