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Ransomware & Incident Response·Updated 2026-10-21

How quickly must a business report a data breach?

Short answer

It depends on the law and sector. Under the EU GDPR, organizations must notify the supervisory authority without undue delay and, where feasible, within 72 hours of becoming aware of a personal data breach that poses a risk to individuals. Other countries, states and industries set their own deadlines.

The details

Know which laws and contracts apply before an incident, and list the deadlines in your incident response plan. Customer contracts and cyber insurance policies often have their own notification requirements.

Terms explained

GDPR
The General Data Protection Regulation (GDPR) is the European Union’s law on the processing of personal data, including security and breach notification duties.
Incident response
Incident response is the organized process of preparing for, detecting, containing, eradicating and recovering from security incidents, then learning from them.

Sources

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