Mental Accounting: How Your Mind Tricks You Into Spending
By Alex Yang

Imagine receiving $100 for your birthday. How would you decide to use it? Would you splurge on an extravagant meal, deposit it into a savings account, or put it towards monthly expenses? Behavioral economics suggests that you’re more likely to spend this money impulsively compared to money you earn through your salary.
This tendency is explained by a concept known as mental accounting, introduced by economist Richard Thaler. Mental accounting refers to the way individuals categorize and value financial transactions based on their source or intended use. Rather than viewing all money as fungible, people often divide it into mental “buckets”, such as expenses, savings, entertainment, or travel.
Sorting money into different mental accounts may seem like a sensible process, but mental accounting can drive individuals to make irrational, often arbitrary decisions. Take, for example, someone who maintains a savings account earning little to no interest while also carrying substantial credit card debt. Despite the high interest rates on credit cards, they may be reluctant to dip into their savings to alleviate their debt, ultimately reducing their net worth. Here, the money in savings is treated differently compared to the money used for repayment, despite the financial gains that may result from using the savings.
Thaler identifies three key components that form the basis for mental accounting, the first of which covers how individuals perceive outcomes. Thaler gives the example of his friend who went to buy a double-sized bedspread. The department store offered double, queen, and king-sized bedspreads priced at $200, $250, and $300, respectively, all discounted to $150 due to a sale. Although needing a double-sized bedspread, the woman ultimately chose to purchase the king-sized one, perceiving more value in the $150 discount than the $50 she would have otherwise “saved”. Her mental account weighed the deal more heavily than the fit or practicality of the item.
The second component involves how people assign finances. Expenditures are grouped into categories and assigned different mental accounts, with individuals placing more emphasis on some accounts than others. The earlier example of an individual juggling a savings account and a mountain of credit card debt illustrates this well. Having dedicated one portion of his funds to savings and another to repayment, this individual failed to recognize the financial benefits of using the savings to pay off his debt. A bias stemming from this is the windfall effect, or the tendency to spend unexpected income more impulsively. Case in point: Tax returns. Individuals often treat tax returns as “found money”, or funds that don’t fit into their financial plans, and spend them lavishly. Despite the fact that tax returns represent overpaid money returned to the taxpayer, many individuals treat the funds as disposable income, spending them on entertainment or travel instead of allocating them thoughtfully as they would regular income.
Additionally, mental accounting involves choice bracketing – how frequently people evaluate their mental accounts. These accounts can be assessed daily, weekly, or yearly, and can be defined narrowly or broadly. The scope at which an account is balanced can provide substantially different anchor points and significantly influence decisions. For instance, a college student buying a cup of coffee every day may consider the $5 spent per day as a negligible purchase. However, considering their yearly $1825 expense and thousands of extra calories consumed, the consequences are no longer so insignificant.
Another important aspect of mental accounting is the pain of paying, which refers to the emotional responses associated with spending money. This pain varies depending on the timing and method of payment. For example, using cash tends to produce more psychological discomfort than swiping a credit card or using a digital wallet, which feels more abstract and less immediate. Additionally, many consumers experience less pain when a payment is separated from the moment of consumption, such as preordering an expensive product, making the item feel “free” when it is received. Similarly, subscription services reduce the pain of paying, as the cost is mentally written off after the initial payment, hiding any subsequent payments and undermining the true cost of the service. These dynamics highlight how mental accounting can influence not only what we buy, but how we feel when we buy it.
While mental accounting offers a useful lens for observing our everyday financial decisions, it may also distort perceptions and override logical decision-making. Understanding mental accounting is imperative to combating consumer biases and leads to a more rational approach to weighing financial decisions.