The Extraordinary Power of Compound Interest
Published on - April 2nd, 2008 (Modified on - December 4th, 2011) (by J.D. Roth) If you’re young, you may not think you need to open a retirement account. You probably think it’s easier to worry about it five years from now. Or ten. You’re wrong. No matter what your age, now is the time to begin saving for retirement. In The Automatic Millionaire, David Bach writes, “The single biggest investment mistake you can make [is] not using your [retirement] plan and not maxing it out.”
Saving is the key to wealth
If you do not spend less than you earn, and if you do not save the difference, you cannot build the wealth you desire. The rich are not rich because they earn a lot of money; the rich are rich because they save a lot of money.
You may be skeptical — I was once skeptical, too. But over the past three years I’ve read a lot on the subject of wealth-building. Books like Stanley and Danko’s The Millionaire Next Door make it abundantly clear that it’s not a high income that leads to wealth — though obviously a high income does not hurt — but the ability to save. Those who become wealthy do so by spending less than they earn.
If saving is the key to wealth, then time is the hand that turns the key to unlock the door. There is no reliable method to quick riches. There are, however, proven methods to get rich slowly. If you are patient, and if you are disciplined, you can produce a golden nest egg that will hatch later in life.
The power of compounding
The best way to ensure your future financial success is to start saving today.
“The amount of capital you start with is not nearly as important as getting started early,” writes Burton Malkiel in The Random Walk Guide to Investing. “Procrastination is the natural assassin of opportunity. Every year you put off investing makes your ultimate retirement goals more difficult to achieve.”
The secret to getting rich slowly, he says, is the miracle of compound interest. Even modest returns can generate real wealth given enough time and dedication.
On its surface, compounding is innocuous, even boring. “So what if my money earns 3.85% in a high-yield savings account?” you may ask. “What does it matter if it averages 8% annual growth in a mutual fund? Why is it important to start investing now?”
In the short-term, it doesn’t make a huge difference, but on the slow, sure path to wealth, we take the long view. Short-term results are not as important as what will happen over the course of twenty or thirty years.
For example, if 20-year-old Britney makes a one-time $5,000 contribution to her Roth IRA and earns an average 8% annual return, and if she never touches the money, that $5,000 will grow to $160,000 by the time she retires at age 65. But if she waits until she’s my age (39) to make her single investment, that $5,000 would only grow to $40,000. Time is the primary ingredient to the magic that is compounding.
Compounding can be made more powerful through regular investments. It’s great that a single $5,000 IRA contribution can grow to $160,000 in 45 years, but it’s even more exciting to see what happens when Britney makes saving a habit. If she contributes $5,000 annually to her Roth IRA for 45 years, and if she leaves the money to earn an average 8% return, her retirement savings will total over $1.93 million. A golden nest egg indeed! She will have more than eight times the amount she contributed. This is the power of compound returns.
The cost of waiting one year
It’s human nature to procrastinate. “I can start saving next year,” you tell yourself. “I don’t have time to open a Roth IRA — I’ll do it later.” But the costs of delaying are enormous. Even one year makes a difference. Here’s a chart to illustrate the cost of procrastination. Again, we’re using 20-year-old Britney as a basis.
![The power of compounding is on the side of the young [Chart demonstrating the effects of compound interest]](http://www.getrichslowly.org/images/compoundspreadsheet.jpg)
If Britney makes $5,000 annual contributions to her Roth IRA, and she earns an 8% return, she’ll have $1,932,528.09 saved at retirement. But if she waits even five years, her annual contributions would have to increase to nearly $7,500 to save that same amount by age 65. And if she were to wait until she was my age, she’d have to contribute nearly $25,000 a year!
To make compounding work for you:
- Start early. The younger you start, the more time compounding has to work in your favor, and the wealthier you can become. The next best thing to starting early is starting now.
- Make regular investments. Don’t be haphazard. Remain disciplined, and make saving for retirement a priority. Do whatever it takes to maximize your contributions.
- Correct your reports. Get hands on a free copy of your credit report to correct your serious mistakes.
- Be patient. Do not touch the money. Compounding only works if you allow your investment to grow. The results will seem slow at first, but persevere. Most of the magic of compounding returns comes at the very end.
Compounding creates a snowball of money. At first your returns may seem small, but if you’re patient, they’ll become enormous.
This article is part of Financial Literacy Month. Look for a companion guest post on compounding later today.
SEARCH FOR RECENT ARTICLES




Heather, there is a distinction between being rich and being independently wealthy. If you are rich, you have a lot of money. If you are independently wealthy it means that you live within your means and are not dependent on others.
You might enjoy the book Your Money or Your Life by Joe Domingez.He talks about the trade-offs people make between having time and doing what you want to do, and making money. Your choices are reasonable, you just have to understand the consequences.
Also, if you get in the habit of saving even a little on a regular basis, it will come easier to you.
BondGuru
loading....
Heather –
I highly recommend you check out some investment calculators which are linked to throughout this website (or just google ‘retirement calculator’). A few hundred thousand dollars will probably /not/ be enough money saved if you intend to just live off of the interest. If you have $300,000 saved up and retire at age 65, it will likely only last you 10 to 12 years (even if you live off of the equivalent of $40,000 or so per year), if that long.
This website
http://moneycentral.msn.com/retire/planner.aspx
estimates that if you have a little over $300k at age 65 and retire, you’ll run out of money around age 79 – assuming that the government gives you $13k per year in social security (which may or may not happen by the time any of us retire!). Without that $13k per year, your money will run out at age 73. 8 years is not a long time to live on $300k in savings! So, a million dollars or more at retirement isn’t really “wealthy” for people who plan to live more than 10 or 15 years, especially if they would like to travel or anything like that in retirement.
I’m not trying to bring you down, just trying to show that many of us who are young grossly underestimate how much retirement will cost! (I’m 23, and I include myself in this category.)
loading....
I’m 54 now. Man I wish I had listened to someone when they told this to me when I was 24. My wife and I have started saving but we are way behind. Better late than never but oh man. What a waste of Money.
loading....
Hi, I discovered your blog very recently and have been benefited to a large degree due to the learning I extracted from it.
In this post,should we not talk abt the impact on inflation and hence the real interest rate. for example, in India the inflation is much higher than the savings yield, and hence even after compounding, the investor would be losing wealth although gaining in currency. The interest rate is also critical while thinking about any investment. What are your views on this?
loading....
OK, here’s a question: should I be saving my money or using it to pay off my debt?
loading....
One other thing to note is that Roth IRA currently has income limits, so it is also advantageous to start investing early in your career before your income rises above the Modified Adjusted Gross Income (MAGI) cap.
loading....
Hi. Those investment calculators always seem to overstate what one needs. Personally, I’ll be happy to die broke (I come from a long line of “don’t expect an inheritance” folks).
Just think about how much less people would need to put away for retirement if we had a reasonable national health care option. I certainly hope we develop one soon!
loading....
@elisabeth
So you’re happy with other people taking care of you. As long as you don’t have to take care of yourself.
I’m sorry, but I rather you die broke before having to pay for your health care.
This is coming from someone who lived under a National Health Service.
This rational makes me sick.
loading....
@plonkee
That would be very useful – although some 90% of the US advice around here is directly transferably to UK finances (see today’s article for example, makes plenty of sense!) I would definitely feel more comfortable reading a UK perspective on the stocks and shares ISA. A friend of mine is doing the same thing as me only contributing to one of those rather than cash, and he’s sweating a little at the moment. However I think we both know long-term his investment plan will beat mine!
loading....
Mike Kingscott, here is the answer. Yes!
loading....
@ elisabeth –
There is a difference between “dying broke” and dying with a huge amount of debt that someone else will have to pay off for you. Leaving that kind of debt to loved ones or society isn’t fair to anyone. And that national health plan? You’ll still be paying for it, just through higher taxes instead of through your insurance premiums and co-pays. Nothing is free. (But then again we all know the US government is an excellent money manager and is known for making bureaucratic decisions that are favorable for the general public, right? Oh wait . . . )
@ Mike Kingscott -
Check out Wesabe.com. Its a personal finance site with tips and information, but includes tons of message boards where you can ask questions of other members and explain more about your personal situation. (No one can answer your “save or pay debt” question without knowing some more background information. Or rather, people can answer, but they won’t know what is actually best in your situation.)
loading....
Relax — I don’t have any debt now and don’t intend to leave any when I die broke. BUT I’d still rather have all of us taxpayers paying for health services for all of us than some of us paying for the emergency room and other costs of having so many people unemployed. I suspect JD doesn’t want to turn this blog into a discussion of national health care, but I will say that I think I can get rich slowly even while I live in a society that doesn’t let anyone suffer from a lack of health care.
loading....
The differences in the returns are truly amazing. And part of me agrees with elisabeth on the health insurance question… in the hospital where I work part-time we recently had a patient who stayed just over a week in intensive care and ended up with a bill of well over a million dollars, because of the overwhelmingly high cost of his life-saving treatments. Unless he was independently wealthy, which he did not appear to be, this illness could likely lead to his financial demise. Sobering…
Jerry
http://www.leads4insurance.com
loading....
That chart makes a fantastic point! If only someone had shown me this chart in high school.
loading....
Saving money is great. Investing money is wise. Starting business is a MUST to became richer…remember is not money that make you rich is business skill what really make you rich. It’s a lifetime learning thing…
loading....
I am convinced if people truly understood the principle of compound interest that a lot of people would be wealthy, and we wouldn’t be in the credit crunch we happen to be in. It was Albert Einstein said it is the most powerful force in the universe there is something behind that.
Brice
http://financialzip.com
loading....
Thank you for your blog post about the effect of compounding interest. I cited your article in a blog post of my own regarding what to do with money that is made online. In my mind, I believe that money made online should be transferred, through EFT, into a bank whose presence is most pronounced on the internet. ING Direct comes to mind.
http://www.shop-network.org/blog/internet-banking-makes-dollars-not-cents/
loading....
I wrote a primer on the power of compound interest, which you can find here:
http://www.btgnow.net/2008/08/compound-interest-is-free-money-part-3-time-is-money-friend/
Time is definately of the essence when you consider the power of compounding. I’m still working on a way to figure out what to do if you hadn’t started investing early (and I think I have a prety feasable idea). Hopefully one day I’ll crack the code and everyone can be millionaire, not just the early birds!
loading....
Einstein did not develop the theory of compound interest. That he did is a myth.
Read BONDS: The Unbeaten Path to Secure Investment Growth to find out how to make compound interest work for you.
You may not make 10% on your money, but you won’t lose money either if you invest in safe bonds.
loading....
@Hildy:
Yes, actually you can lose money, just not the way most people think:
Safe bonds such as Treasury Bills (bonds backed by safe governments like the US or Canada) will be safe in the sense that they will likely not cause you to lose any of your initial investment. Of course, there are many bonds that are incredibly risky as well, so an investor shouldn’t start thinking that ALL bonds are safe investment vehicles.
Even with “safe” bonds, however, there is something called interest rate risk: it’s the risk that inflation will rise faster than the interest rate the bonds are offering. For example: if you bought a bond today that paid 5% per year for 5 years, and for the next five years the annual inflation rate was less than or equal to 5%, you’d either make a little bit of a positive return (if inflation is less than 5%), or you’d be just keeping pace with inflation (5%). If the annual inflation rate during those 5 years is GREATER than 5%, then your bond payments are lagging behind inflation and your are losing purchasing power.Inflaton is outpacing your returns, and you are in a very real sense losing money in the form of lost purchasing power.
The value of your bond will also have decreased if you tried to sell it to compensate the person you sold your bond to.
The book you pointed out sounds interesting though, I’ll definately have to to check it out.
loading....
You are correct in stating that there is a risk of inflation in every investment, including bonds. Interest paying bonds, however, soften the blow if the interest can be invested at the higher rates. That is how an investor gets growth in bonds- through the investment of interest and the reinvestment of returned principal at higher rates.
For the serious bond investor an even more serious problem is the decline of interest rates. Though the bonds might appreciate, all the interest is invested at lower rates, and maturing bonds must be reinvested at lower rates. This risk is exacerbated by keeping your assets liquid and in short-term maturities. Investors tend to overlook this problem and focus on the effects of inflation.
In BONDS: The Unbeaten Path to Secure Investment Growth, we outline different bond investment strategies for many investment situations and types of investors.
loading....
I quoted you on my blog the other day and credited you and everything.
“The rich are not rich because they earn a lot of money; the rich are rich because they save a lot of money.”
Please let me know if that is not ok. This was an excellent post that I had to pass along!
loading....
The rich have money for many reasons, Liz. However, they will remain rich if they do not understand the power of compound interest. They must save enough to continue to replenish their depleting capital.
Those of us who start out with no money must save. If you start early enough, a small amount of money can make you a millionaire.
The savings must be invested in bonds or another investment that provides a stream of income. I prefer bonds because bonds pay interest without any additional work on my part.
Conservative, plain vanilla bonds are less risky as well. The income from the bonds or other investments must be re-invested to have growth. The growth comes from the compounding of the income, paying interest on interest.
This is different from putting money into stock and hoping someone will buy you out at a higher price. It is the stalactite hanging from a cave wall, continuously dripping water onto the stalagmite below.
Thank you for posting my statement on your website, Liz.
Please check out my book BONDS: The Unbeaten Path to Secure Investment Growth, Bloomberg Press, 2007.
loading....
I prefer equity fund or mutual funds because the higher returns. Government bonds and Treasury bills are also good if you need to invest it short time. However, time is also a major key player in compound interest so start early!
loading....
You have to work for the IRA the first 4 months out of the year, just to pay income/sales tax for the year!
There is something very wrong about that…
loading....
I mean the IRS…
loading....
There is a new class of bonds coming to market. They are municipal bonds that are taxable and will grouped under the title Build America Bonds (BAB). They are suitable for retirement accounts and for people seeking taxable income. They will be municipal bonds, supported by your taxpayer dollars and revenues received by municipalities. The Federal government will be supporting the issuance of these bonds through tax credits. They are new, so the yields may be attractive.
loading....
I’m 19 and putting myself through school, I want to start saving what other instruments earn compoud interest. I’m also putting a little into a 401k but I don’t plan on staying with this company very long what will happen to that money? And should I stop contributing?
loading....
Hi Thomas,
Plain vanilla bonds will enable you to earn compound interest on your savings. It is a simple answer, but also quite complex in executing it.
After you leave this employer, you can roll you 401K into an IRA and invest the money yourself.
loading....
Why isn’t anyone talking about equity indexed universal life insurance?
loading....
wow what a eye opener
i’m 26 years old & i just closed my first business
i owe about 11000 and at the moment spend more than i earn, i have a plan to eliminate my debts by the end of the year however i work for a min wage and would like 2 go to school to get my degree it just seems so hard building an emergency fund save for IRA for school and for a home down payment-where i live houses r very expenses(Israel)
what to do first?
loading....
I HAVE A QUESTION…SORRY FOR THE IGNORANCE, BUT HOW OR WHERE DO YOU START A COMPOUNDING ACCOUNT? AT YOUR LOCAL BANK? IF SO WHAT IS THE ACCOUNT CALL?
loading....
I came across this site recently http://www.inspiredtosave.com whilst trying to each my kids about compound interest and why they should save from a young age. It seems to have sparked their imagination…
loading....
I’ve been investing in my Fidelity IRAs since I was 18. I am now 40 years old. I’ve been contributing $3000 annually for 22 years.
I have put more than $66,000 into my IRAs and my balance now stands at $104,000.
The “Magic of Compound Interest” is a crock of sh*t in the real world. Nobody makes a consistent 8% interest annually.
loading....
Where do I sign up for 8% interest..?
I understand the value of compound interest. It’s a great thing, if one can get an interest rate worth a darn.
But I’m really tired of example after example being posted online showing regular folks getting annual rates of 7-10%.
Sure, it illustrates the value of compound interest. But this isn’t 1983 here. The best CD rate I can currently find is still under 2%.
So, while using high interest rates is a good way to show the effect of compounding, the examples are so unrealistic as to be near worthless.
loading....
Barbara Fussmuller wrote that she is tired of being told she can get 8% on her investments, when all she sees is 2 percent on Certificates of Deposit. Actually, Barbara, most professional investors are not getting 8 percent either, as we can see from the underfunding of public pension plans. However, you can get 4 percent on some high quality corporate bonds and sometimes better than that on high quality taxable municipal bonds. You do have to look beyond the C.D. however.
loading....