Underwriting (Insurance)
Underwriting in the insurance context is the process by which an insurer evaluates an applicant's risk profile to decide whether to offer coverage and, if so, at what premium and under what conditions.
Insurance underwriting is fundamentally the practice of risk selection and pricing. An underwriter reviews information provided by or about the applicant — medical history, lifestyle factors, occupation, geographic location, property characteristics, or claims history — and applies actuarial models and underwriting guidelines to assess the probability and likely severity of future claims.
In life and health insurance, underwriting typically involves reviewing an application, ordering medical records, requesting a paramedical exam or blood work for larger face amounts, and potentially applying for attending physician statements. The outcome is an underwriting decision: standard approval (at the filed rate class), approval with a rating (an added premium surcharge reflecting elevated risk), exclusion of specific conditions, or declination.
In property and casualty insurance, underwriting focuses on physical characteristics of the insured property, the applicant's loss history, credit-based insurance score, and geographic risk factors such as flood zones, wildfire exposure, or crime rates. Commercial lines underwriting also assesses business operations, management experience, and industry-specific hazards.
Underwriting profit, or underwriting income, is a key metric for evaluating insurance company performance. It equals earned premiums minus incurred losses and loss adjustment expenses minus underwriting expenses. The combined ratio — the sum of the loss ratio and the expense ratio — is the standard industry shorthand: a combined ratio below 100% indicates underwriting profitability; above 100% indicates an underwriting loss.
Social inflation — the tendency of jury awards and litigation costs to rise faster than general inflation — is a growing pressure on casualty underwriters in the US, particularly in lines such as commercial auto, general liability, and directors and officers coverage.