Proactive service delivery overcomes the traditional duty-to-apply principle, where citizens must take the initiative themselves. Instead, authorities automatically identify entitlements based on existing register data and initiate corresponding services or actively inform citizens. Examples include automatic payment of child benefits upon birth registration, proactive pension notifications or event-based social benefit notifications upon unemployment. The technical prerequisite is cross-register networking of government data and mature identity management. From a data protection perspective, proactive service delivery requires clear legal bases and often the consent of those affected. The concept is closely linked to the once-only principle and register modernisation and is considered an indicator of mature e-government systems.