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The Hidden Trap in Your Finances: How Mental Accounting Can Distort Financial Decisions (and How to Fix It)

6 March 2025

Have you ever splurged on a luxurious item because you found a ‘great deal’? Or are you more relaxed spending on your credit card than spending your physical cash?

This is called "mental accounting", a common bias that affects how we view our money, leading to different spending and saving habits.

Welcome to 10 Years Wealthier With Miriam! In this blog, we'll dive into how mental accounting can hold you back from financial success and show you how a financial adviser can help. Pay close attention, as this information will help you understand how to make better financial decisions!

The value of an investment with St. James's Place will be directly linked to the performance of the funds you select and the value can therefore go down as well as up. You may get back less than you invested.

What is Mental Accounting?

Think of Mental accounting as having separate mental compartments for your money. We tend to categorise our money based on its source or intended use, even though it all holds the same value. It's' like having a monthly budget and organising your spending meticulously (which is a good thing) but then having excess income at the end of the month (disposable income) which you just 'waste' because it doesn't form part of the 'said' budget.

Imagine receiving a hefty Tax rebate, which you did not expect to receive, you might be inclined to spend it impulsively, it's technically free money… right?'

Or you might have a monthly gym membership, which is costing you a fortune, and you haven't visited in a long while. However, you refuse to cancel because you will go tomorrow and it is an investment into your future health (unfortunately, tomorrow never seems to arrive). In reality, you are wasting your hard-earned money - is it time to revisit that budget?

Thinking in these ways can lead to numerous poor financial choices and connects to the concept of behavioural finance, which emphasises that emotions and biases often cloud our financial judgement.

Key Concepts In Behavioural Psychology: How do these concepts relate to the Stock Market?

While mental accounting can influence investor behaviour, leading to both holding onto losing stocks and panic selling, it can also present opportunities. Savvy investors understand that market downturns can be ideal times to increase investments. Investors that have a long-term perspective should understand that lower pricing is normal, and won't necessarily stay lower in the long run. This gives the potential for growth although there is no guarantee that the price will rise. If it does this could take a significant amount of time and you cannot predict by how much. In the worst case it could drop even lower.