If you're a manager at a bus transportation company, you probably ask yourself the same question every renewal season.
“We didn’t have many accidents this year, so why did the contribution go up again?”
This isn’t surprising. That’s because contribution fees consist of both factors your company can control and those it cannot—and the uncontrollable factors are structurally set to rise over time.
This article explains how bus mutual aid association contribution rates are determined, why they keep rising, and what variables transportation companies can actually influence.
First, let me make one thing clear. This article is not intended to criticize the mutual aid association. The mutual aid system is designed to reflect the realities of the transportation industry, and as we’ll see below, there are structural causes behind the contribution increases that even the association cannot control. The purpose of this article is to understand that structure and identify what transportation companies can do within it.
Mutual aidassociations arenot insurance companies but mutual aid organizations. They operate by pooling the contributions paid by members (transportation companies) to collectively cover accident compensation claims for those members. The National Bus Mutual Aid Association and the Chartered Bus Mutual Aid Association, among others, operate under this model.
Within this structure, the variables that influence contribution amounts fall into two main categories.
Our company’s accident and compensation history is factored into the calculation of contributions at renewal. Companies with a high number of accidents cannot have the same contribution amount as those with few accidents.
However, the specific calculation method varies depending on the association and contract terms, and the detailed criteria are not publicly disclosed. What is certain is the general trend— if accident performance worsens, the contribution burden increases; if it improves, the company gains an advantage in negotiations and renewals.
This is an aspect that many transportation companies overlook. In a mutual aid structure, if the association’s total claims payments increase, the premium rate itself goes up.
In other words, even if our company has no accidents, our contribution may rise if accidents and compensation payments increase across the entire industry. This is where the answer to the question, “Why did it go up even though we had no accidents?” usually lies.
To summarize— Contribution = Our company’s accident record × The association’s total claims cost. We can influence the first variable, but we cannot influence the second.
Why does the association’s total claims cost keep rising? Regardless of the number of accidents, there are structural factors causing the compensation paid per accident to increase.
In a February 2019 plenary session ruling (2018Da248909), the Supreme Court raisedthe working life expectancy (the age at which a person is deemed capable of earning an income through work) for manual laborers from 60 to 65. This extended the period used to calculate lost earnings—a major component of compensation—by five years. As a result, compensation amounts have increased accordingly, even for the same type of accident.
Medical expenses, which constitute the cost of personal injury compensation, are rising sharply. According to statistics from the Health Insurance Review and Assessment Service, medical expenses for traditional Korean medicine under auto insurance have increased approximately fivefold over the past 10 years, from about 350 billion won in 2015 to about 1.7 trillion won last year, and now account for over 60% of total medical expenses under auto insurance. This structure means that even if the number of accidents remains the same, the cost per claim for personal injury compensation is increasing.
The same is true for property damage. As vehicle prices, parts costs, and repair labor costs have risen, the cost of repairs has increased accordingly.
Loss of earnings and compensation for pain and suffering are linked to income levels. As society’s overall income rises, the standards for calculating compensation amounts rise as well.
The common thread among these three factors is that they are variables beyond the control of transportation companies. The same applies to the association. If premium rates are frozen while compensation costs rise, the association’s finances will not be able to sustain the burden. An increase in contribution rates is not so much the fault of any one party as it is the inevitable result of this structural reality.
Therefore, the conclusion boils down to one thing: as long as the latter variable continues to rise, the only way to protect our company’s contribution rate is through the former variable—our own accident record.
Let’s examine just how significant the cost of an accident actually is. These are the actual figures confirmed through interviews with domestic bus transportation companies.
| Company Type | Confirmed Accident Cost Range |
|---|---|
| Group of 5 Companies in the Seoul Metropolitan Area | Numerous cases of compensation for passenger injuries on board ranging from 60 to 70 million won per incident |
| Operators with approximately 250 buses in the Seoul Metropolitan Area | Approx. 100 million won per month (approx. 1.2 billion won annually) |
| Operators with approximately 150 vehicles in South Chungcheong Province | Approx. 620 million won annually |
Source: Interviews with safety management officials at transportation companies (3 companies)
This amounts to approximately 4 million to 4.8 million won per vehicle per year. Furthermore, all three companies confirmed one common fact: accidents involving passengers inside the vehiclesaccount for the largest share, and as these costs accumulate over many years, they effectively function as fixed costs.
These payment records directly correspond to the accident records in Tier ①. Reducing these figures provides the basis for a successful renewal defense.
Ultimately, the way to lower the accident record is to reduce the number of accidents, and the proven method for reducing accidents is to intervene before risky driving leads to an accident.
AI-Matic’s AI safe driving solutionperforms this intervention using data.
Its effectiveness has been verified. In a pilot project conducted by the Korea Transportation Safety Authority for route buses (13 transport companies, 500 buses, 1,615 drivers, based on 1,000 km of driving) confirmed reductions of 99.7% in drowsy driving, 93.4% in failure to monitor the road ahead, and 87.6% in traffic signal violations.
There is also data directly relevant to the topic of this article. This is the result of analyzing accident data from the National Charter Bus Mutual Aid Association, focusing on 18 transportation companies and 1,077 busesthat adopted the AI Safe Driving Solution for commuter buses operated by major domestic corporations.
| Comparison Period | Change in Insurance Payouts | Decrease |
|---|---|---|
| Second half of 2023 → Second half of 2024 | 2.165 billion won → 692 million won | -1.473 billion won (68% decrease) |
| Second half of 2022 → Second half of 2024 | 1.169 billion won → 692 million won | -477 million won (40.8% decrease) |
It is worth noting that the source of these figures isnot the claims of the implementing companies themselves, nor the marketing materials of the solution providers, but rather the mutual insurance association’s accident statistics data. This follows the structure we saw earlier—when accidents decrease, the compensation paid by the association decreases, and that performance is recorded in the mutual insurance association’s data. This is an example confirmed by the association’s data showing that Level ① (the company’s own accident record) actually changes.
Let me be honest about one thing: a decrease in accidents does not automatically or immediately lead to a reduction in premium contributions. Premium calculation is the association’s responsibility, and the renewal cycle and method of reflection vary by contract. However, the structure is clear — Fewer accidents → Fewer compensation payments → Improved accident record → A favorable position in renewals and negotiations. In a situation where uncontrollable variables drive up premium rates, this is the only leverage a transportation company can wield.
And above all else—a decrease in accidents means that drivers and passengers are not getting hurt. The premium is merely a figure that follows from that result.
👉Get a diagnostic assessment of your company’s accident performance management system
We’ll use data to analyze the frequency of risky driving behaviors and identify the top priorities for reducing your accident rate.
A. Since mutual insurance associations operate on a mutual aid structure, your premium reflects not only your company’s accident record but also the association’s overall loss ratio and claims costs. Due to rising medical and repair costs, court rulings expanding the scope of compensation (such as raising the age limit for loss of earning capacity to 65), and rising income levels, the compensation amount per accident is increasing. Consequently, when industry-wide costs rise, the contribution rates for accident-free companies may also increase.
A. There is no publicly available formula. Operational matters, such as contribution amounts, are outlined in the mutual aid regulations and approved by the Ministry of Land, Infrastructure and Transport; however, the specific calculation methods and the extent to which factors are reflected are not routinely disclosed to the public and vary depending on the association, contract terms, and renewal timing. One thing is certain—if accident and claims performance worsens, the premium burden increases; conversely, if performance improves, you’ll be in a more favorable position during renewal and negotiations. Please check the terms of your contract with your association for specific details.
A. A mutual aid association is an organization established by transportation operators for mutual aid and is operated pursuant to **Article 64 (Mutual Aid Business) of the Passenger Motor Vehicle Transportation Business Act**. To conduct mutual aid business, an association must establish mutual aid regulationscovering operational matters such as contribution fees, mutual aid payments, and liability reserves, and obtain approval from the Minister of Land, Infrastructure, and Transport. General property and casualty insurance companies, on the other hand, are for-profit entities subject to supervision by financial authorities under the Insurance Business Act, so their governing laws and supervisory frameworks differ. Most commercial buses are enrolled in mutual aid associations, and a key structural difference is that, due to the nature of the mutual aid structure, the association’s overall loss ratio is reflected in the contribution amounts.
A. Since the only controllable variable is your company’s own accident record, the first step is to identify the extent and types of risky driving occurring within your company. Accidents do not happen suddenly; they are preceded by repeated risky behaviors such as drowsy driving, failure to watch the road ahead, and sudden acceleration. Detecting and warning drivers of these behaviors in real time, and managing them on an individual basis, will lead to actual improvements in accident rates. This approach was confirmed to reduce drowsy driving by 99.7% in a pilot program involving 500 route buses.
A. They do not decrease immediately or automatically. Calculating contribution rates falls under the union’s jurisdiction, and there is a renewal cycle for reflecting performance data. Additionally, in years when the union’s overall costs rise, the rate of increase may be mitigated even if performance is strong. However, improved accident performance serves as a strong basis for favorable renewal terms and negotiations, and even before that, the direct costs of accidents—such as compensation payments, repair costs, and administrative responses—are reduced.
A. All three transportation companies interviewed cited accidents involving passengers on board (such as passengers falling during sudden stops) as accounting for the largest share of compensation payments. This is because the system generally recognizes the company’s liability for such accidents, leading to a high rate of compensation claims, and because the proportion of serious injuries—such as fractures among elderly passengers—is also high. The financial impact of a single passenger accident on board is detailed in the article “Can AI Prevent Accidents Involving Passengers Falling or Doors Opening While the Bus Is Moving on Route Buses?”
The explanation of the contribution structure in this article is based on the general operating principles of the mutual aid system; specific calculation criteria and application methods vary depending on the union and contract terms. Accident cost data is based on interviews with transportation company officials (anonymous). Please check with your affiliated union for exact contribution terms.