What Does an Actuary Do?

An actuary uses mathematics, statistics, economics, and financial analysis to measure uncertainty and help organizations make informed decisions. Actuaries study what could happen in the future, estimate the financial effect of those events, and design strategies that keep risks manageable. Their work is especially important in insurance and pensions, but actuaries also support investment decisions, business planning, healthcare financing, and public policy.

How actuaries turn uncertainty into financial information

Most organizations face decisions involving events that have not happened yet. An insurer needs to estimate how many policyholders will make claims and how expensive those claims could be. A pension plan needs to estimate how long members will receive payments. A company considering a new product needs to understand the chance of losses and the amount of capital required to absorb them.

An actuary cannot predict an individual event with certainty. Instead, the actuary examines patterns in historical data and combines them with assumptions about future conditions. The result is a financial model that estimates possible outcomes. That model allows decision-makers to compare risk with the resources available to handle it.

This work involves more than entering information into a formula. Actuaries decide which data is relevant, assess whether it is reliable, choose appropriate assumptions, and test how results change when those assumptions change. They also explain the limits of a model. A projection is useful only when decision-makers understand what it represents and where it could be wrong.

What does an actuary do in insurance?

Insurance is the field most closely associated with actuarial work. An insurance company collects premiums from many customers and uses that money to pay claims made by a smaller number of customers. The actuary helps estimate how much the company should charge and how much money it should hold for future claims.

One important responsibility is pricing. An actuary analyzes factors that affect the likelihood and cost of claims. In auto insurance, that could involve driving history, vehicle characteristics, location, and patterns in repair costs. In health insurance, the analysis can involve expected use of medical services and changes in treatment costs. In life insurance, the actuary studies mortality patterns and the financial effect of policy benefits.

The purpose of pricing is not simply to charge the highest possible premium. The price needs to reflect expected claims and the insurer’s operating costs while remaining suitable for the market and consistent with applicable requirements. If prices are too low, the insurer can struggle to pay claims. If prices are too high, customers may choose another provider.

Actuaries also estimate reserves. A reserve is money that an insurer sets aside for claims and related expenses that it expects to pay. Some claims are reported quickly, while others take time to settle. A claim can also develop in value after it is first reported. Actuaries use available claim information and historical patterns to estimate the total future cost.

Reserve estimates require judgment because the final cost is not known when the estimate is made. Medical prices can change, repair costs can rise, and legal decisions can affect claim payments. Actuaries monitor actual results against earlier projections and update their models when experience changes.

How actuaries support pensions and employee benefits

Actuaries who work with pension plans measure whether a plan is likely to have enough assets to provide promised benefits. Their calculations connect several uncertain factors. These include how long members will live, when they will retire, how much they will earn before retirement, and how plan investments may perform.

For a defined benefit pension plan, the actuary estimates the present value of future payments. A payment expected many years from now is worth less today than the same payment due immediately, so the calculation uses assumptions about investment returns or discount rates. The result helps the plan sponsor understand the funding needed to support the benefits.

The actuary also studies how changes in assumptions affect the result. If members live longer than expected, the plan may need to make payments for more years. If investment returns are lower than expected, the plan may have fewer assets available. These changes do not automatically mean a plan is failing, but they can affect funding decisions and long-term planning.

Actuaries may advise employers, trustees, government bodies, or plan administrators. Their work can help explain funding requirements and the financial effect of changing a benefit design. The exact rules for pension calculations depend on the jurisdiction and the type of plan, so actuaries apply the relevant professional and legal framework rather than relying on a single universal method.

What does an actuary do outside insurance?

Actuarial methods apply wherever organizations must make financial decisions under uncertainty. In enterprise risk management, an actuary can help a company identify risks that could affect earnings, capital, or long-term stability. The analysis might examine losses from operational problems, changes in customer behavior, or unusual events that are difficult to estimate using ordinary budgeting methods.

Some actuaries work in healthcare. They can estimate the cost of providing care under a health plan and evaluate how changes in membership or service use affect financial results. Their analysis can help a healthcare organization set reserves, compare plan designs, or assess whether expected funding is sufficient.

Actuaries also work in investments and financial services. They may analyze the risk of different investment strategies or assess whether an institution has enough capital to withstand unfavorable market conditions. In these roles, the actuary does not remove investment risk. Instead, the actuary helps decision-makers see how risk could affect future financial outcomes.

Government agencies and public organizations can use actuarial analysis when planning programs that involve long-term payments or uncertain costs. The work can inform projections for public benefits, healthcare programs, or disaster-related financial exposure. The actuary’s role is to provide a reasoned estimate and make the assumptions behind it clear.

What does an actuary do during a typical project?

An actuarial project begins with a business question. The question might be whether an insurance product is priced appropriately or whether a pension plan can support its expected benefits. A clear question matters because the same data can support different analyses depending on the decision that must be made.

The actuary then gathers and examines data. This can include policy records, claims information, payment histories, demographic information, financial statements, or investment results. The actuary checks how the information was collected and looks for missing values, unusual results, or changes in definitions. Poor data can produce a precise-looking answer that is still misleading.

After reviewing the data, the actuary selects a method and establishes assumptions. Some assumptions come from observed historical experience. Others require professional judgment because the future will not exactly repeat the past. For example, an actuary might need to assess how medical costs, interest rates, mortality, or claim settlement patterns could change.

The actuary builds or updates a model that combines the data and assumptions. The model could be a spreadsheet, a specialized software system, or a more advanced statistical program. The model estimates expected outcomes and can also show a range of possible results. Testing different assumptions helps reveal which factors have the strongest effect on the decision.

The final stage is communication. Actuaries prepare reports, explain findings to clients or executives, and answer questions about the analysis. A strong report does not hide uncertainty behind a single number. It explains what the estimate means, which assumptions support it, and what could cause actual results to differ.

Why models and assumptions matter

An actuarial model is a structured representation of reality, not reality itself. It simplifies complicated events so that they can be analyzed. That simplification makes decisions possible, but it also creates a responsibility to identify what the model leaves out.

Two actuaries can reach different results while using sound professional methods if they select different assumptions. One model might assume that claim costs will rise faster than another model. The difference does not necessarily indicate an error. It shows why assumptions must be documented, reviewed, and compared with actual experience over time.

Actuaries use sensitivity testing to examine this issue. They change one assumption or a group of assumptions and observe how the result moves. If a small change creates a large financial difference, that factor deserves close attention. Sensitivity testing helps organizations prepare for uncertainty instead of treating the main estimate as a guaranteed outcome.

How an actuary differs from related professionals

Actuaries and accountants both work with financial information, but their central questions differ. An accountant focuses on recording, reporting, and interpreting financial activity that has occurred. An actuary focuses more heavily on uncertain future events and the financial consequences those events could create.

Actuaries also differ from data scientists in their professional context. Both can use statistical models and programming tools. An actuary applies those techniques to financial risk and must connect the results to decisions involving pricing, reserves, capital, or long-term obligations. A data scientist may work on a wider range of prediction problems that do not involve the same financial reporting or risk-management requirements.

Financial analysts study investments, company performance, and market conditions. Their work can overlap with actuarial analysis, especially in financial services. The distinction depends on the role, but actuaries are particularly concerned with uncertain liabilities and the resources required to meet them.

What skills does an actuary need?

Actuaries need strong quantitative reasoning because their work depends on probability, statistics, finance, and mathematical modeling. They must understand how a calculation works rather than treat software output as automatically correct. That understanding helps them recognize unreasonable results and choose methods suited to the problem.

Communication is equally important. An actuarial finding may be presented to people who do not work with probability or financial models. The actuary must explain the result in plain language and connect it to the decision at hand. A technically correct analysis has limited value if the people responsible for acting on it cannot understand it.

Professional judgment also matters. Historical data can reveal patterns, but it cannot answer every question about the future. An actuary must decide when a past pattern remains useful and when changing conditions require a different assumption. Ethical conduct is central because actuarial advice can affect customers, employees, investors, and the financial stability of an organization.

How actuaries help organizations make better decisions

The main value of an actuary is the ability to connect uncertainty with financial planning. Instead of asking only what an organization hopes will happen, actuarial analysis examines what could happen and what each outcome could cost. That perspective supports more disciplined choices about prices, reserves, funding, and capital.

An actuary does not guarantee that an organization will avoid losses. No model can eliminate uncertainty. The actuary helps decision-makers recognize risk early, compare possible outcomes, and develop a financial response that is proportionate to the exposure.

In practical terms, an actuary might show that a proposed product needs a different price structure, that a pension plan requires a revised funding approach, or that a company should hold more capital for an uncertain liability. The recommendation comes from analyzing evidence and assumptions rather than relying on intuition alone.

That combination of mathematics, financial understanding, and judgment explains what an actuary does. Actuaries measure the cost of uncertain future events, test how those costs could change, and communicate the results so organizations can make responsible long-term decisions.