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26 July 2026

Understanding the house money effect and mental accounting

Discover the psychology behind prize money and how it can teach valuable lessons about budgeting and financial management

Understanding the house money effect and mental accounting

The house money effect is a phenomenon where people tend to take more risks and make different financial decisions when they are playing with money they consider ‘house money’, or money that is not their own. This concept is often illustrated through sports prize stories, where winners of large sums of money may make impulsive and risky financial decisions. For example, a tennis player who wins a large prize may be more likely to splurge on luxuries or invest in risky ventures, rather than saving or investing their winnings wisely.

This behavior is closely related to mental accounting which refers to the way people tend to categorize and manage their money mentally. When people receive a windfall, they may mentally account for it as ‘extra’ money, rather than integrating it into their This can lead to poor financial decisions, as they may be more likely to spend or invest the money impulsively, rather than considering their long-term financial goals.

Understanding the 50/30/20 rule

To avoid the pitfalls of the house money effect and mental accounting, it’s essential to have a solid understanding of budgeting principles. The 50/30/20 rule is a simple and effective way to allocate your income. This rule suggests that 50% of your income should go towards necessary expenses such as rent, utilities, and groceries. 30% should be allocated towards discretionary spending such as entertainment, hobbies, and travel. Finally, 20% should be dedicated to saving and debt repayment.

Building an emergency fund

Having an emergency fund in place is crucial for managing unexpected expenses and avoiding debt. A general rule of thumb is to save 3-6 months’ worth of living expenses in an easily accessible savings account. This fund can help you cover unexpected expenses, such as car repairs or medical bills, without having to go into debt or dip into your long-term savings.

Micro-investing and long-term savings

Micro-investing involves investing small amounts of money regularly, rather than trying to invest a large sum all at once. This approach can be a great way to get started with investing, as it allows you to take advantage of compound interest and build wealth over time. By setting aside a small portion of your income each month, you can make progress towards your long-term financial goals, such as saving for retirement or a down payment on a house.

Creating a windfall plan

If you’re lucky enough to receive a windfall, such as a prize or inheritance, it’s essential to have a plan in place for managing the money. A windfall plan should include strategies for saving, investing, and spending the money wisely. This may involve consulting with a financial advisor, paying off high-interest debt, and allocating the money towards your long-term financial goals.

Author

Henry Anderson

Henry Anderson of Edinburgh, sharp-corporate in demeanour, famously argued to run a council budget deep-dive after a packed Holyrood briefing, choosing public-accountability over easy headlines. Prefers evidence-led interrogation of institutions and collects annotated maps of the Lothians as a private quirk.