LEGAL CALCULATIONS
By Lisa M. Serra
2 + 2 = IT DEPENDS.
A stereotype about lawyers disliking math is widely held, including by lawyers themselves; however, many lawyers happen to have excellent math skills. In fact, there are various connections between the law and mathematics, and having a certain level of math competence enhances legal representation, including with regard to critical thinking, financial management, and client-specific needs.
THE PROCESS
The actual methodology of math — proving a fact, stating rules, and applying the rules to the facts to reach a conclusion — parallels the “IRAC” organizational scheme used in legal writing. As you may recall from your 1L year of law school, IRAC is an acronym that stands for “Issue, Rule, Application, Conclusion.” IRAC is taught to law students as an organizational structure for legal writing. Indeed, while lawyers are not solving the Riemann hypothesis, they do use inductive reasoning much like the mathematical thought process.
UTILIZING MATHEMATICS IN LAW
Below are various examples of how mathematics is commonly utilized in the practice of law.
Analytical and Logical Thinking
The various math disciplines train lawyers to be logical and critical thinkers. Analytical thinking and logical reasoning are especially important in emotionally charged cases, courtroom negotiations, and witness examinations. Lawyers with strong analytical skills can better solve legal problems, make strategic decisions, and advocate for their clients.
Furthermore, analyzing and drafting documents and contracts also requires a strong analytical mind to ensure client interests are protected. A minor drafting error can have major mathematical (and financial) consequences. Drafting errors (or drafting without an understanding of math) can lead to money loss for clients. For example, a settlement is $500,000 at 5% interest over five years. Is that simple interest or compound interest? A lack of specificity in the settlement agreement can cost the client thousands of dollars. Another example: Suppose a client negotiating a settlement agrees to receive the payout by way of retirement assets in the future over dollars today. Due to the time value of money, a dollar today holds greater value than a dollar received in the future. A lawyer’s analysis should account for both the tax implications and the appropriate discount rate when evaluating future dollar amounts.
Calculating Damages
Lawyers routinely calculate various types of damages. For example, in a personal injury case, lawyers work to calculate compensatory damages (monetary awards intended to compensate a plaintiff for losses and injuries they suffered due to the defendant’s actions). They may use methods like the per diem or multiplier method to assess damages. The per diem method assigns a daily rate (often based on daily earnings) and multiplies it by the number of days suffering occurs. The multiplier method multiplies special damages by a factor (usually 1.5 to 5) reflect-ing injury severity and impact. This involves totaling economic damages (like medical bills and lost wages) and applying a multiplier based on injury severity.
In business and contract disputes, lawyers calculate lost profits, lost earnings, and diminution in business value. Lost profits are calculated by subtracting the costs associated with lost sales from the lost sales revenue. Lost earnings are estimated by multiplying expected earnings by work-life expectancy, taking into account factors like age, sex, and education level. Diminution in business value involves comparing the business’s value before and after the wrongful act. In truth, while some types of damages are straightforward additions, others may require various mathematical methods to arrive at a reliable estimation of damages.
Other Applications in the Law
Several areas of law heavily rely on mathematical concepts and calculations. In family law, lawyers calculate child support, alimony, and property division, which often involves mathematical formulas and calculations. In tax law, financial documents and accounting are crucial. In estate planning, valuating assets and property, calculating the net worth of a person, and dividing the estate for beneficiaries are all commonplace. In criminal law, statistical analysis is essential for interpreting evidence. In medical malpractice, lawyers must calculate damages, including medical bills, lost wages, and pain and suffering. In business, corporate, and financial securities law, lawyers deal with various financial statements and accounts and investment principles, requiring them to understand math and accounting principles. In patent law, lawyers need to understand technical aspects of inventions and assess their novelty and inventiveness, often involving mathematical and logical reasoning. As you can see, lawyers need to be comfortable with basic arithmetic operations and potentially more complex financial calculations.
Divorce and Family Law Focus
Let’s look deeper at divorce and family law as an example. In divorce and family law cases, understanding financial records and planning for the future are tasks that will help your clients protect their lifestyle and assets and make informed decisions throughout the legal process. Below are examples of divorce and family law topics commonly entwined with mathematics:
- Computation and analysis of the marital estate and separate property.
- Division of marital property.
- Calculation of child support and spousal support.
- Evaluation of property and business appraisals and valuations.
- Present-value calculations and amortization schedules.
- Estimation of tax implications.
- Organization, analysis, and interpretation of bank, financial, and retirement accounts.
- Review and analysis of individual and business tax returns.
- Interpretation of the financial implications of employment benefits and plans.
- Estimation of future budgets.
In divorce and family law matters, lawyers commonly work with financial experts in cases involving complex financial issues. These experts can provide impartial analysis and testimony in complex cases to help the court understand more-difficult financial concepts like business valuations, damages, and lost profits.
Family law practitioners are frequently required to hire a financial expert to determine the marital interest of a privately held business. Effectively representing your divorcing client requires an understanding of multiple math and financial concepts, such as the type of valuation approach (asset, market, or income?), how reasonable compensation is determined, what adjustments to income need to be made, and whether a discount should be applied based on the ownership structure and ability of the spouse to control the sale of the business, just to name a few.
Business Management
Lastly, lawyers who own their own law firm or are managing partners at larger firms need strong math, financial, and accounting skills to handle budgeting, billing, expenses, and taxes. A lawyer with strong financial instincts will help run the firm most efficiently.
CONCLUSION
While lawyers are commonly known for their ability to read, write, and, of course, argue, they also commonly use some level of math in their careers daily. Just as mathematicians teach us the importance of being better analytical thinkers, this way of critical thinking is important for lawyers, too. We need to be able to see our cases logically to generate the best outcome for our clients. Critical thinking is crucial to analyzing evidence and making informed decisions that can ultimately determine the outcome or settlement of a case. In essence, critical thinking equips lawyers with the ability to reason effectively, make sound judgments, and navigate the complex legal landscape to provide effective representation for their clients.
As you can see, you cannot practice law without mathematics! While advanced math may not be required, strong analytical skills, logical reasoning, and basic arithmetic are crucial for success in the legal field.
