Why People Spend Bonuses Differently Than Regular Salary

Mental accounting is the cognitive habit of placing income into separate mental “buckets” based on source, purpose, or perceived stability. Workers treat an annual bonus as discretionary “found money” rather than income—even though it’s deferred compensation they worked for—and therefore spend it on splurges instead of saving. This gap between identical after-tax dollars demonstrates how emotion and categorization override rationality.

The Core Mechanism: Bucketing Income

Mental accounting is the process by which people mentally segregate and label different sources of money. A worker might have one mental bucket for “salary I need to live on” and another for “bonus I can play with.” The same $100 bill triggers different spending rules depending on which bucket it enters.

This framing effect is powerful. A person earning $60,000 salary plus a $10,000 annual bonus has $70,000 annual income. But psychologically, that bonus feels “extra”—outside the monthly budget. If the bonus is deposited into a separate account or thought of as a one-time gift, the person is far more likely to spend it on a vacation, a watch, or home renovations rather than routing it to the mortgage or retirement account.

The reason is that the budget is built around the salary, not the total income. The salary is recurring, predictable, and essential for paying rent, utilities, and food. It’s mentally anchored to survival and stability. The bonus, by contrast, is uncertain (you might not get one next year; it might be smaller) and feels like an addition, not a core part of income.

Why Bonuses Feel Like Windfalls

Several psychological factors reinforce the bonus-as-windfall frame:

Temporal separation. A bonus is often paid once a year, in a lump sum, separated by months from the paycheck rhythm. This discontinuity signals “different” in the brain. A regular paycheck, even though it’s the same $5,000 every two weeks, blends into the expected flow of life. A bonus arrives suddenly, in a larger amount, breaking the routine.

Earned vs. awarded. Many workers feel they “earn” their salary through showing up and doing their job, but they feel they’ve “been awarded” or “gotten lucky with” a bonus. Even though the bonus is contractual and earned, the language of surprise (“Are you getting a bonus this year?”) frames it as uncertain or discretionary.

Fragility. Bonuses are often the first thing cut in downturns. A company might maintain salaries but slash bonuses by 50%. This fragility reinforces the idea that bonuses are marginal, not core to income. A worker thinks, “I can’t count on it, so I won’t budget around it.” That frees mental permission to spend it differently.

Comparative thinking. A worker compares the bonus size to the salary, not to the total annual income. If salary is $120,000 and the bonus is $15,000, the bonus is 12.5% of the salary. That framing—“a little extra”—triggers different behavior than reframing it as earning $135,000 total.

The Spending-Rate Gap: Empirical Evidence

Research in behavioral economics documents that people save a much smaller fraction of bonuses than they save of equivalent salary increases.

In one typical study, workers were told they would receive either an extra $5,000 added to their annual salary (paid monthly) or a $5,000 one-time bonus. The marginal propensity to save was roughly double for salary (workers saved 30–40% of the salary increase) versus the bonus (workers saved 15–25% of the bonus). The rest went to consumption.

The effect is robust across income levels, ages, and countries. Even financially sophisticated workers—accountants, economists, people who understand the math—fall into the mental accounting trap. The phenomenon isn’t a lack of knowledge; it’s a cognitive default.

Over a career, this matters enormously. A worker who receives $20,000 in total bonuses over a decade but spends 80% of it will have saved $4,000. That same $4,000 could have compounded at 5% annually and become $6,500 by retirement. On a $10 million lifetime earnings (salary plus bonuses), the difference in retirement savings is hundreds of thousands of dollars.

Loss Aversion and Regret

Mental accounting also interacts with loss aversion—the tendency to feel the pain of losing money twice as acutely as the pleasure of gaining it.

Because salary is budgeted and expected, cutting it feels like a loss. A salary cut from $60,000 to $55,000 provokes anger and regret. A bonus cut from $10,000 to $7,500 feels disappointing but less like a violation. Since the bonus was never “locked in” as part of the core budget, losing some of it is less painful than losing salary.

This asymmetry extends to saving. A worker resists cutting salary consumption (they feel a loss), so they maintain spending. But they’ll accept saving a bonus, because the bonus wasn’t factored into the budget anyway. It’s “found” money, so putting 25% into savings feels like a “gain” (better than expected), not a sacrifice.

How to Override the Effect

Knowing about mental accounting allows people to consciously reframe their finances:

Merge accounts. If a bonus lands in a separate account, it stays mentally separated. Depositing it into your main checking account, where it mingles with salary, makes it harder to treat differently.

Automate savings. Before the bonus hits your discretionary consciousness, route a fixed percentage (50%, 75%) directly to savings or a Roth IRA. You don’t deliberate; the decision is made upfront.

Rename it. Call your bonus “deferred salary” or “equity compensation” rather than “bonus.” Reframing changes the mental bucket.

Create sub-buckets consciously. Instead of fighting the mental accounting instinct, use it. Decide in advance that the bonus is 70% savings and 30% discretionary. Give yourself permission to “splurge” on the 30%, so you’re less tempted to raid the 70%.

Track regret. After spending a bonus unwisely, many workers regret it within months. Remembering that regret next year—or tracking it explicitly in a journal—can shift behavior without requiring willpower.

Broader Implications

Mental accounting is why tax refunds often get spent rather than invested (they’re “free” money, or feel like it), why inheritance recipients often spend it faster than earned income (it’s a windfall, not labour), and why a $10,000 annual raise divided into monthly increases ($833/month) is saved at lower rates than a $10,000 lump-sum bonus.

It also explains why companies can sometimes boost employee morale and behaviour by restructuring compensation. Switching from a fixed bonus to a monthly “performance bonus” (same total) might reduce actual savings—but it can boost perceived income stability and reduce anxiety about income uncertainty, which may offset the mental accounting loss.

Understanding mental accounting doesn’t make the effect disappear, but it highlights why personal financial planning can’t rely on rational income math alone. Human money decisions are shaped by psychology, framing, and categorization as much as by math.

See also