This is one of the most if not, the most important concept to understand of how money works. I wrote about it before the widespread accessibility of AI in The 8th Wonder of the World. Even tracking your net worth, along with expenses to income will not create the immense impact of knowing this concept.
Now that we have Perplexity, Claude, ChatGPT, Gemini, I queried several of them on “how to explain the time value of money and compounding interest.” And I was sorely disappointed with the straight-out-of-textbook answers using examples of $100, $1,000 or $10,000 over a 1 – 3-year time period. That does not truly capture the capacity of this concept, nor does it even remotely represent what you should be aiming for in your investment and retirement accounts.
The textbook definition doesn’t create that visual “wow factor” that most people need. The time value of money (TVM) states that a sum of money is worth more now than the same sum will be in the future. This is because money available today can be invested and earn a return, increasing its value over time. Conversely, a dollar received in the future is worth less today because of factors like inflation, which erodes its purchasing power.
These articles emphasize the importance of knowing technical financial equations, but who actually whips out the financial calculator on their phone to calculate these equations when they contribute to a 401(k) plan or negotiate a new vehicle or house? You either have the financial scenarios built out in a spreadsheet or you kind of wing it because you are somewhat blindly driven by the need to have it without a complete understanding of what you are getting yourself into. Understanding the Time Value of Money The Power of Compound Interest: Calculations and Examples
It’s hard to think about a year into the future, let alone 30 – 50 years. Some don’t even allow their mind to wander that far. But that is where the magic of compounding lies and the key to understanding the time value of money.
In the Excel file, I have run a compounding calculation out for 30+ years starting at $100,000 to show how it works without adding or subtracting any amounts to that milestone amount. It creates the context needed between the starting amount of $100,000 and the resulting amount of $814,511 after 31 years. Instead of only showing the starting and ending amounts that conventional textbooks, the internet and AI show, it gives you how much the amount grows each year.
It creates perspective when you run various scenarios at different amounts, ages, years and rates of return. This can create contentment for some or momentum for others depending on your mindset, desires and plans for the future. Your focus shifts from the tangible, short-term, tactical thinking to the intangible, long-term, strategic thinking. It also helps you ride the roller coaster of investing through the down years.
Once you see this and connect the numbers (dots), your mind will never go back to seeing the one dimensional view.
I did check all the 30-year calculations with a quick AI query. When I input 31 years, it skewed the calculation slightly.
Featured Image – Devils Island, WI – photographer Cary Wauters
People will play devil’s advocate and challenge you, but you can always run different scenarios to find options and a different way.