U.S. private passenger auto insurance net premiums written reached $345.9 billion in 2024, marking another year of double-digit growth for one of the largest segments of the American property and casualty insurance market.
According to data compiled by the Insurance Information Institute (Triple-I) from the National Association of Insurance Commissioners and S&P Global Market Intelligence, private passenger auto net premiums written increased 12.8% from $306.6 billion in 2023.
The increase followed a 14.4% gain in 2023, giving the personal auto insurance market two consecutive years of double-digit premium growth.
The $345.9 billion figure represents net premiums written after reinsurance transactions and excludes state funds. Private passenger auto accounted for 37.1% of total property and casualty net premiums written in 2024, making it the largest individual line of insurance in the category.
The rapid increase in premiums came after a period of relatively weak growth during the early years of the pandemic. Triple-I says insurers have been adjusting rates as vehicle replacement costs, parts prices, repair expenses, and liability claim costs have risen.
That makes insurance an increasingly important part of the cost of owning a vehicle. Although consumers often focus on the purchase price of a new or used car, insurance can add thousands of dollars to annual ownership costs, depending on the vehicle, driver, location, and coverage.
Liability Insurance Accounted for $193.4 Billion.
Liability coverage represented the largest portion of private passenger auto insurance premiums in 2024. Net liability premiums written reached $193.4 billion, compared with $173.2 billion in 2023. That represented an 11.7% increase.
Liability insurance covers a driver’s legal responsibility for injuries or property damage caused to other people. Because medical expenses, vehicle repair bills, and legal costs can become substantial after a crash, liability coverage represents a major exposure for insurers.
Collision and comprehensive coverage generated another $152.4 billion in net premiums written during 2024, compared with $133.4 billion in 2023. That represented a 14.3% increase, meaning physical-damage coverage grew faster than liability insurance during the year.
The difference between these coverage categories also reflects changes in vehicle technology and repair costs. Modern vehicles increasingly use cameras, sensors, electronic systems, and advanced driver-assistance features. Damage to a relatively small section of a vehicle can therefore require expensive replacement parts, specialized labor, or electronic calibration.
Triple-I found strong correlations between consumer price changes for vehicles and vehicle-related expenses and the rate changes implemented by auto insurers. New-vehicle prices had an 88% correlation with average insurance rate changes when the consumer-price change was shifted forward one year.
Motor vehicle parts and equipment had a 74% correlation, used vehicles 79%, and motor vehicle maintenance and repair 78%.
These relationships help explain why insurance premiums have remained under pressure even as some pandemic-era disruptions have eased. When vehicles and repairs become more expensive, insurers can face higher claim costs and may adjust premiums accordingly.
The premium data also show how quickly the market has changed. Private passenger auto premiums increased just 6.0% in 2022 before accelerating to 14.4% in 2023 and 12.8% in 2024.
Premium Growth Remains in Double Digits
The 2024 results represent a significant departure from the relatively moderate premium growth seen before the pandemic.
Private passenger auto liability premiums increased 2.0% in 2019 and declined 2.2% in 2020. Collision and comprehensive premiums also fell 0.9% in 2020. The declines occurred as driving patterns changed substantially during the initial stages of the COVID-19 pandemic.
Growth returned as driving activity recovered. Liability premiums increased 4.5% in 2022, while collision and comprehensive premiums rose 8.1%. The acceleration became much more pronounced in 2023, when liability premiums increased 11.6%, and collision and comprehensive premiums climbed 18.1%.
The momentum continued in 2024. Liability premiums increased another 11.7%, while collision and comprehensive premiums rose 14.3%.
At the same time, insurers achieved a significant improvement in underwriting performance. Triple-I reported a personal auto net combined ratio of 95.3 in 2024, the industry’s best underwriting result of the post-pandemic period. A combined ratio below 100 indicates an underwriting profit, while a ratio above 100 indicates an underwriting loss.
The liability and physical-damage segments produced different results. Liability coverage recorded a combined ratio of 101.2 in 2024, while collision and comprehensive coverage posted a combined ratio of 87.9. The broader personal auto result was therefore pulled below the 100 mark by improving performance in physical-damage coverage.
The improvement in underwriting performance does not necessarily mean consumers immediately receive lower insurance bills. Premiums are based on insurers’ expectations about future losses as well as historical claims. Rates can therefore remain elevated while insurers work to bring profitability back to sustainable levels.
Rising Claim Costs Continue to Pressure Insurers
One of the clearest indicators of the changing insurance environment is the increasing cost of individual claims.
Triple-I reported that personal auto liability claim severity increased 54.2 points cumulatively between 2019 and 2024. During the same period, the pure premium trend, which incorporates both claim frequency and claim severity, increased 25.0 points cumulatively. Triple-I reported a compound annual growth rate of 4.6 points for the pure premium trend.
The distinction between claim frequency and severity is important. Frequency measures how often claims occur, while severity measures how expensive those claims become. Triple-I said liability claim frequency remained below pre-pandemic levels, but the average cost of claims continued to increase.
The 2024 figures show how expensive individual incidents can be. The average auto liability claim for property damage was $6,770, while the average bodily injury liability claim reached $28,278. The average collision claim was $5,489, and the average comprehensive claim was $2,306.
Claim frequency remained relatively low compared with the number of insured drivers. In 2024, 0.80% of people with liability insurance had a bodily injury liability claim, while 2.50% had a property-damage liability claim. Collision coverage recorded a 4.16% claim frequency, and comprehensive coverage recorded a 3.95% frequency.
Those figures illustrate why severity can have such a large effect on insurance costs. Even when claims do not occur frequently, a significant increase in the average cost of each claim can raise the amount insurers need to collect through premiums.
Triple-I has also identified legal-system abuse as an additional source of pressure on liability losses. Its analysis with the Casualty Actuarial Society estimated that increased litigation, larger jury awards, and greater attorney involvement drove auto liability losses and defense and cost-containment expenses up by between $76.3 billion and $81.3 billion from 2014 through 2023.
The regulatory environment can also influence how quickly insurers can adjust rates. Triple-I, citing Insurance Research Council research, reported that the time required to obtain approval for rate changes increased 40% between 2010 and 2023. The share of filings receiving less rate impact than insurers requested also increased by 10 percentage points.
The combination of higher vehicle costs, more expensive repairs, rising liability severity, and regulatory constraints has therefore created a complicated environment for insurers and drivers alike.
The 2024 figures show that the personal auto insurance market is in a stronger financial position than it was during the most difficult years following the pandemic. Triple-I reported that the direct incurred loss ratio improved by 21.7 percentage points from its peak of 86% in the fourth quarter of 2022 to 64% at the end of 2024.
However, improved underwriting performance has not eliminated the cost pressures behind insurance pricing. Parts, labor, vehicle replacement costs, and liability claims remain important factors in determining what insurers ultimately need to charge.
For American drivers, the $345.9 billion in private passenger auto net premiums written in 2024 represents a major financial component of vehicle ownership. The 12.8% increase from 2023 also shows how quickly the market has expanded after years of relatively modest growth.
The data suggest that rising auto insurance costs cannot be attributed to a single factor. More expensive vehicles and repairs, increasing claim severity, liability losses, legal expenses, and state-level regulatory conditions have all influenced the market.
At the same time, insurers are beginning to show stronger underwriting results. The 95.3 combined ratio recorded in 2024 indicates that the industry has made substantial progress in restoring profitability after the severe underwriting pressure experienced earlier in the decade.
For motorists, however, the improvement in insurer finances does not automatically translate into cheaper policies. The underlying costs of repairing vehicles, replacing parts, and resolving liability claims remain elevated.
As vehicles become more technologically complex and the cost of accident-related losses continues to influence insurers’ results, car insurance is likely to remain a significant part of the affordability equation for American drivers.
