Data protection impact assessments (DPIAs): your startup's practical guide
Last updated: 25 July 2026
As a UK or EU startup, you're likely innovating with new technologies, processes, or data types. While exciting, this can also introduce new risks to people's privacy. That's where a Data Protection Impact Assessment (DPIA) comes in.
A DPIA isn't just another piece of GDPR bureaucracy; it's a valuable tool to help you identify, assess, and mitigate data protection risks before they become problems. For many activities, it's also a legal requirement.
what is a DPIA?
A DPIA is a process designed to identify and minimise the data protection risks of a project. It’s essentially a risk assessment, but specifically focused on your processing of personal data. The Information Commissioner's Office (ICO) in the UK defines it as a "process for building and demonstrating compliance."
Think of it as a pre-mortem for your data operations. Instead of waiting for a data breach or a complaint, you're proactively looking for potential issues and putting solutions in place.
when is a DPIA legally required?
Under Article 35 of the UK GDPR and EU GDPR, a DPIA is mandatory when a type of processing "is likely to result in a high risk to the rights and freedoms of natural persons." This can sound a bit vague, but the ICO provides helpful guidance and lists some examples:
- Systematic and extensive evaluation of personal aspects: This includes profiling, especially when decisions are made with legal effects on individuals or significantly affect them.
- Large-scale processing of special categories of data or data relating to criminal convictions/offences: Special categories include health data, genetic data, biometric data, racial or ethnic origin, political opinions, religious or philosophical beliefs, or trade union membership.
- Large-scale systematic monitoring of a publicly accessible area: Think CCTV in public spaces, not just a small office.
- Using new technologies or innovative organisational solutions: This is particularly relevant for startups. If you're building something novel that processes personal data, a DPIA is often a good idea, and sometimes legally required.
- Processing that involves a high volume of data subjects: While 'large-scale' isn't explicitly defined, consider the number of individuals affected, the volume of data, the duration, and the geographical scope of your processing.
- Transfers of personal data outside the UK/EU: Especially if data is going to a country without an adequacy decision.
Even if not legally required, conducting a DPIA for any new project involving personal data processing is considered best practice. It helps you build trust and can improve your overall data governance.
the key steps of a DPIA
While there's no single mandatory format, a typical DPIA process involves these core steps:
- Describe the processing operation: What data are you collecting? Why? Where is it coming from? Who will have access? How long will you keep it? What are the data flows?
- Assess necessity and proportionality: Is this data processing really necessary to achieve your purpose? Is there a less intrusive way to achieve the same goal? Are you collecting too much data? Are your retention periods justified?
- Identify and assess risks to individuals: What are the potential harms if something goes wrong? (e.g., discrimination, identity theft, financial loss, reputational damage, psychological distress). Consider confidentiality, integrity, and availability risks.
- Identify measures to mitigate risks: What safeguards can you put in place? This could include technical measures (encryption, pseudonymisation, access controls) and organisational measures (training, policies, DPIA review schedule).
- Record and review: Document your findings, the decisions made, and the reasons for them. A DPIA isn't a one-off; you should review it regularly, especially if the processing changes significantly.
practical tips for startups
- Integrate it early: Don't treat a DPIA as an afterthought. Build it into your project planning and development lifecycle. It’s much easier to address privacy concerns early on than to refactor a nearly finished product.
- Collaborate: Involve relevant stakeholders, including product, engineering, marketing, and operations teams. Data protection is a collective responsibility.
- Start simple: You don't need a huge, complex document from day one. Use a template (like those available on StartupDocs!) to guide you. Focus on clearly articulating the challenge and solution.
- Keep it focused: Avoid jargon where possible. Explain what you're doing and why it matters for data protection in plain language.
- Seek expert advice: If you're dealing with particularly sensitive data or complex processing activities, consider consulting a data protection officer (DPO) or a solicitor specialising in data protection. StartupDocs' GDPR/UK DPA compliance checks can also help you identify potential red flags.
By conducting DPIAs, you're not just complying with the law; you're demonstrating to your users that you take their privacy seriously, building trust, and reducing the likelihood of costly data incidents down the line. It's a key part of responsible innovation.
Please note: This article provides general information and does not constitute legal advice. Always consult with a qualified legal professional for advice tailored to your specific circumstances.