
Albert Einstein is rumored to have said “the most powerful force in the universe is compound interest.” I say rumored because as much as his quote is used in financial circles, its debated whether he really said it or not. Regardless, it’s a pretty valid statement.
Compound interest arises when interest is added to the principal, so that from that moment on, the interest that has been added also itself earns interest. This addition of interest to the principal is called compounding (i.e. the interest is compounded). A loan, for example, may have its interest compounded every month: in this case, a loan with $100 initial principal and 1% interest per month would have a balance of $101 at the end of the first month, $102.01 at the end of the second month, and so on. Wikipedia
Compound interest can be for or against you. It is for you when it is applied to the money you’ve saved. It is against you when it is applied to money you owe (either a loan or credit card debt for example). For now I’ll be talking about how you make it work for you by saving and investing your money.
Now before I get any further, let’s be clear that this subject for most people falls into the category of I wish I knew about this sooner! So I’m hoping you’re getting this sooner than later. If not, than let’s remind ourselves that late is better than never.
Let’s look at some examples of what will happen if you start early verses starting late. For these examples we’ll assume the interest we earn will be 10%. Admittedly this is ambitious in today’s economy, however this has been the traditional long-term return on investments in the stock market, particularly when observing the S&P 500 index.
An 18-year-old named Mike who begins saving only $100 a month ($1,200 per year) and invests it with a 10% return until the age of 65 will have $1,151,006.81! He will be a millionaire.
Now assume the same scenario of $100 per month invested at 10% until the age of 65 except Mike doesn’t begin saving until he’s 28. He will than have only $435,652.12. In order to catch up to where he could have been, if he waits until 28 to start saving he would have to now save $250 a month at the same interest rate.
If Mike waits until 38, at 65 he will have $159,851.92. Or he could catch up by saving about $700 per month.
One more example and then we’ll move on.
If Mike as an 18-year-old begins saving $200 a month ($2,400 per year) at 10% interest until the age of 65 he will have $2,302,013.61!
Depending on your age, the numbers will change. Also, your interest rate will change based on a number of factors. So to figure out where you could be, play around with a compound interest calculator. Run some different scenarios for yourself. What will happen if you start sooner than later? If you invest more per year than less?
It is exciting to see that even with modest savings ($100 a month from the time we start our first job), we see the potential to become a millionaire! If you’re starting later, it is still possible with a little more discipline. But in any event, the key is to leverage your time and your money through the power of compound interest.
In short:
- Save early as possible
- Save as much as possible