Compound Interest: How To Earn $ On Your Money

Have you ever had a terrible day that just seemed to keep getting worse? You didn’t hear your alarm go off, so you woke up 20 minutes late. When you jumped out of bed in a panic, you stubbed your toe on the nightstand (who put that there?!). At least you still had time to make yourself a fresh, steaming-hot cup of coffee! Unfortunately, on your way to work, an idiot cut you off in traffic and that steaming-hot cup of coffee flew out of your hand and on to your favorite white shirt.

Nice. Huffing and puffing, you barely make it into the office when a coworker stops you and says, “Are you ready for your presentation in the meeting this morning?” (Oh, sh*t. I thought that meeting was tomorrow!) Later on, you realized that you packed a can of cat food instead of chicken salad for your lunch (ew), gave your crush a fist bump in return to a high-five (awkward), dropped a stack of important documents everywhere, and ripped your pants when you bent down to pick them up (tragic). It’s 4:58pm. You’ve almost made it through the day (thank goodness), but you decide to send one last email before you head home. You need to send your coworker, Danielle, a spreadsheet she requested, and decide to mention how annoying your boss has been lately. Sent! Then your heart stops. That email didn’t go to Danielle. It went to Daniel…your boss.

We’ve all had one of those days. But, what makes a day like this so bad? It’s not because just one little thing went wrong. Oh no. It’s because one bad experience seemed to lead to another, which led to another and another, compounding into a terrible day overall.

While this example of a bad day demonstrates how compounding can work against you, compounding interest is a financial tool that can actually work for you in a very positive way, even on a crappy day. Holla!

First of all, what is compound interest? Compound interest is a basic financial concept where interest is not only calculated on your initial investment (simple interest), but is calculated on your initial investment PLUS any interest you have earned previously. Your money is earning money on its money.

Let’s break it down:

Say you put $1,000 into an account that is earning 5% simple interest for 10 years. At the end of the 10 years, you would have a total of $1,500. ($1,000 x .05 = $50 x 10 Years = $500). However, let’s also say that you put $1,000 into an account that is earning 5% compound interest for 10 years. In this case, at the end of 10 years, you would have a total of $1,628.89. How did you end up with more money using compounding interest vs. simple interest? Let’s break it down even further:

For the DIY-ers out there, here’s the formula used to calculate compound interest:

P [(1 + i)ⁿ – 1]

P= Principal (Original Investment)

i = Annual Interest

n = Number of Compounding Periods

So, to plug in the numbers from above:

$1,000 [(1 + .05)¹⁰ – 1] = $628.89

And here’s a comparison between simple and compound interest over time:

If you’re like me, you probably just glazed over that last section like a Krispy Kreme donut. (I donut blame you). So, we see how the numbers work. Why does it matter?

Compound interest could be the single most important factor either making or breaking your bank account over time. You could either be using compounding interest to your advantage by putting funds into a retirement or investment account and allowing it to compound (grow) more quickly over time. Or, compounding interest could be your worst nightmare if you’ve got high interest credit card or student loan debt, which would compound just as quickly, but in the wrong direction. (Yikes!)

As we can see in the chart above, compounding interest produces a greater return (grows faster) than simple interest over the same period of time. And the key word here is TIME. The concept of compounding interest is pretty spectacular on its own. However, without the crucial ingredient of time (no, not thyme, sorry G’ma), your compound interest will produce very bland results. The longer you wait to withdrawal any of your funds, the more powerful – and flavorful – the compounding effect will be. (Can you tell I’m hungry? Did someone say pizza??)

If you put $1,000 in a retirement account that grows through compounding interest, congratulations! You’re #winning at this game of life. But, if you become impatient and decide to take out $10 here or $20 there, you’ll quickly undermine all the positive benefits of compounding, while likely getting slapped with some hefty tax penalties as well (if you’re under 59 ½). Ouch – Game Over.

If you’re someone who struggles with delayed gratification (aka ME), here’s a life hack to make you think twice about taking money out of your compounding accounts. It’s called the Rule of 72, and it’s a fast calculation to show how quickly your money can double inside a compounding account (without taking withdrawals – no touchy).

Simply divide 72 by the annual interest percentage to see how many years it will take for your money to double. For example, if you’re earning an average of 8% annually in an investment account, your money will double in 9 years (72 / 8 = 9). You put in $1,000 today and you’ll have $2,000 in 9 years. Cha-ching! Obviously, the more money you can invest early on, and the longer you can let it grow, the better your outcome will be.

This is exactly why the best time to start saving is today. Like, NOW. (Actually, the best time to start saving was yesterday…but there’s no time like the present!)
If you want to see for yourself how compound interest works, check out this, this, and this. You’re welcome.

Written By: Kaitlyn Duchien

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