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P&C Reserving

Loss Reserving & IBNR Calculator

Upload loss development triangles or enter data directly. Actua applies Chain Ladder, Bornhuetter-Ferguson, Cape Cod, and other reserving methods to calculate IBNR and ultimate loss estimates — with every development factor and calculation step shown.

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Supported Methods

Chain Ladder (Development)

The standard development method. Actua calculates age-to-age factors, selects development factors (simple average, volume weighted, or custom), projects ultimate losses, and derives IBNR for each accident year.

Bornhuetter-Ferguson

Combines prior loss expectations with actual development. Useful when early development periods are volatile. Actua derives the BF ultimate as: Incurred + (Expected Ultimate × % Unreported).

Cape Cod (Stanard-Bühlmann)

A credibility-weighted blend that derives the expected loss ratio from the data itself, avoiding reliance on external loss ratio assumptions.

Paid-Incurred Chain (PIC)

Uses both paid and incurred triangles jointly for a more robust reserve estimate, particularly useful when paid and incurred development patterns diverge.

Frequency-Severity

Separate projection of claim counts and average claim costs, with ultimate reserves derived from the product. Supports trend analysis on both components.

Excel Upload Support

Upload your loss triangle as an Excel file (.xlsx, .xls, or .csv). Actua automatically detects the triangle structure, identifies accident years and development periods, and applies the reserving methods. Results can be exported as an audit-ready workbook with development factors, ultimate loss projections, and IBNR estimates — complete with live Excel formulas.

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5 free queries per day. Upload your triangle and get results instantly.

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