METHODOLOGY & SOURCES
Base cost: IBM Cost of a Data Breach Report 2024 (Ponemon Institute) sets the professional services sector average at $5.08M. This calculator scales from that baseline using firm size, practice area sensitivity, and security posture — the three primary cost variables IBM identifies.
Cost breakdown: IBM 2024 report attributes ~38% to lost business/churn, ~27% to detection/escalation, ~20% to post-breach legal/regulatory response, and ~15% to notification activities.
Security posture multiplier: IBM data shows organizations with mature incident response programs incur up to 54% lower breach costs. Organizations with minimal security posture pay up to 30% above sector average.
Downtime: Statista and Coveware report an industry average of 24 days of operational downtime following a ransomware attack. Adjusted by posture per IBM's finding that tested IR plans reduce identification and containment time by 54 days on average.
Client churn: Ponemon Institute Consumer Aftermath of a Data Breach study: 70% of consumers would stop doing business with an organization after a breach. Adjusted upward for high-sensitivity legal matters where trust is the primary client relationship driver.
Disclaimer: Estimates are for planning purposes only. Actual costs vary by incident type, jurisdiction, and firm-specific factors. Consult a qualified cybersecurity professional for a firm-specific assessment.
Sources: IBM Cost of a Data Breach Report 2024 • Ponemon Institute Consumer Aftermath of a Data Breach Study • ABA 2023 Legal Technology Survey Report • Statista / Coveware Ransomware Benchmarks 2024