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Look... every euro I ever earned was exactly the same. But I did not treat them the same. My salary I saved a portion of automatically, every single month, without thinking twice. My bonus I spent. Almost all of it. Every single year. Also without thinking twice. Same money. Same bank account. Same person. Two completely different rules.
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Not financial advice. For educational purposes only. I am not a financial advisor. Always do your own research and consult a qualified advisor before making any investment decisions.
Look... every euro I ever earned was mathematically identical. Same currency. Same bank account. Same purchasing power. But I did not treat them the same. My salary I saved a portion of automatically, every single month, without thinking twice. My bonus I spent. Almost all of it. Every single year. Also without thinking twice.
Same money. Same bank account. Same person. Two completely different rules. And I had no idea I was doing it until I finally ran the numbers.
"I had created invisible compartments in my mind for money that existed in exactly the same place."
Mental accounting is a concept developed by Nobel Prize-winning economist Richard Thaler. It describes the tendency of people to treat money differently depending on where it came from, where it is kept, or how it is intended to be used. In practice, people create mental "accounts" for different types of money — salary, bonus, tax refund, gambling winnings, inheritance — and apply different rules to each one, even though the money is fungible and economically identical.
A bonus feels like "extra" money. It did not form part of the mental budget. There was no plan for it. So it flows toward consumption — a holiday, a piece of technology, a restaurant run. Salary feels like "real" money. It is planned around. It carries obligations. It is treated carefully.
The irony is that the bonus is often larger than a month's salary and arrives at a moment of peak financial capability. It is exactly the money that should be invested most aggressively. Instead it is the money most commonly spent impulsively.
Look... the numbers are uncomfortable. Over fifteen years of Big 4 consulting, bonuses arrived annually. Each one was treated as unexpected extra income rather than as planned investment capital. If even half of each annual bonus had been invested at a 7% average annual return, the compound growth over that period would represent a very significant sum. Running the exact numbers for your own situation — using any compound interest calculator — is worth doing. The results tend to be sobering.
Look... the fix is simple but it requires making the decision before the money arrives. Before the bonus hits the account, decide what percentage goes directly to investment. Automate the transfer for the day after the bonus lands. The remaining amount can be spent without guilt — because the investment has already been protected before the mental accounting kicks in. You cannot spend what is already gone.
What is mental accounting in behavioural finance?
Mental accounting is the tendency to treat money differently based on its source or intended use, despite money being fungible. Described by Nobel laureate Richard Thaler, it explains why people spend windfalls, bonuses and tax refunds more freely than regular income, even when the money is economically identical.
Why do people spend their bonus instead of saving it?
Because bonus money is mentally categorised as extra income rather than planned income. It bypasses the budget rules that apply to salary and flows toward discretionary spending. This is mental accounting in action. Deciding how to allocate a bonus before it arrives is the most effective way to counter this tendency.
How much of my bonus should I invest?
There is no universal answer. A common approach is to treat bonus income with at least the same savings rate as salary income, or higher, since bonus income is typically unbudgeted. The key is deciding the allocation before the money arrives, not after.