What is Residual Risk?

Residual Risk

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Residual Risk

Residual risk refers to the remaining risk after controls and mitigation efforts have been applied to a particular risk scenario. It’s the risk that persists after all risk management efforts have been implemented.

In many contexts, especially in finance and IT security, risk management is a continuous and iterative process that involves:

  • Risk Identification: Recognizing potential threats or vulnerabilities.
  • Risk Assessment: Evaluating the potential impact and likelihood of the identified risks.
  • Risk Treatment: Applying controls, methods, or processes to reduce the risks.
  • Risk Monitoring and Review: Continually observing and analyzing the risk environment to detect any changes or new risks.

Even after all these steps, it’s almost impossible to mitigate all risks entirely. The remaining risks—those that haven’t been fully mitigated—are known as residual risks.

For example, consider a company that stores sensitive customer information in an online database. To protect this data, the company might:

  • Use encryption to safeguard data.
  • Install firewalls to deter unauthorized access.
  • Conduct regular security training for employees.
  • Implement multifactor authentication for system access.

Even after all these measures, there’s still a chance, however small, that a sophisticated hacker could breach the system. The risk of such a breach, after all the aforementioned controls have been put in place, represents the residual risk.

Decision-makers should be aware of residual risks to determine if they are within acceptable levels. If a residual risk is still too high, additional controls or mitigation strategies may be necessary. Conversely, if the costs or downsides of further mitigation outweigh the benefits, an organization might choose to accept the residual risk.

Example of Residual Risk

Let’s delve into a more detailed example related to cybersecurity, a context where the concept of residual risk is often discussed.


Suppose the ABC Corporation relies heavily on its online platforms to conduct business. The company has identified a potential risk: cyberattacks that could compromise its customer data.

Initial Risk Assessment:

Upon assessment, they realize that without any protective measures, the potential for a cyberattack is high, leading to a significant potential financial loss, legal repercussions, and reputational damage.

Risk Treatment:

To reduce this risk, ABC Corporation takes several measures:

  • Encryption: They encrypt all customer data to ensure it’s unreadable without the correct decryption key.
  • Firewall Installation: A state-of-the-art firewall system is put in place to deter unauthorized access.
  • Employee Training: All employees undergo mandatory cybersecurity training to avoid common pitfalls, such as falling for phishing scams.
  • Regular Backups: The company decides to back up its data daily to off-site servers.

After implementing these controls, the likelihood of a successful cyberattack is significantly reduced.

Residual Risk Assessment:

However, even with these measures in place, there’s a smaller chance that a sophisticated hacker, using a novel technique, might breach the system. This remaining risk, after all mitigation efforts, represents the residual risk.

ABC Corporation assesses this residual risk and determines it’s now low. But it’s not zero. They must decide if this level of risk is acceptable or if they need to invest in further controls, like hiring a dedicated cybersecurity team or purchasing more advanced intrusion detection systems.


After a cost-benefit analysis, ABC Corporation realizes that while they could reduce the residual risk further by investing heavily in more advanced security solutions, the cost of those solutions would outweigh the potential benefits. They decide the current level of residual risk is acceptable, but they will continuously monitor for emerging threats to reevaluate this decision in the future.

In this scenario, the residual risk is the remaining vulnerability to cyberattacks after all the current mitigation efforts. ABC Corporation’s acknowledgment and management of this risk demonstrate a proactive approach to risk management.

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