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What Is Compounding Interest?

Compounding Interest Is King

The beauty of long-term investments is the compounding effect. Compounding allows you to generate earnings from previous earnings. This is a powerful tool as a small investment can generate huge payout over time.  Below are a few examples of how understanding compounding interest can lead to huge gains. 

Example 1: Set It and Forget It

  • Principal (starting value invested): $10,000
  • Annual growth rate: 10%
  • Period of time money is left to grow: 30 years

Using the above investment parameters, you’d end up with $200,000 at the end of 30 years. Not bad for a $10,000 investment! 

Example 2: Double the Principal

  • Principal (starting value invested): $20,000
  • Annual growth rate: 10%
  • Period of time money is left to grow: 30 years

Using the above investment parameters, you’d end up with $400,000 at the end of 30 years. All we did was invest an extra $10,000 at the beginning, but we ended up gaining an extra $200,000 over our example 1 investment. That is the power of compounding interest! 

Understandably, most people don’t have an extra $10,000 in the couch cushions to reinvest. The good news is, adding to your retirement incrementally will pay huge dividends. 

Example 3: Incremental Investments

  • Principal (starting value invested): $10,000
  • Incremental additional funds invested: $500 per month
  • Annual growth rate: 10%
  • Period of time money is left to grow: 30 years

If you invest $10,000 into a retirement fund today that gains 10% annually and now you add $500 per month over the next 30 years, you’ll have nearly $1.35 million. By putting some money away each month towards your retirement, you can now live out your Golden Years in style!

To get a better understanding of how this works, check out this compounding interest calculator

Check out additional topics to make personal finance SLIGHTLY EDUCATIONAL on our Personal Finance page.

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