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How Much Money You Need to Retire

How Much Money You Need to Retire

How much money do you need to retire?

If you’re a software developer and you’re earning, which you might very well be—or soon to be—because software development is in demand, you might find yourself asking this question. And when you do, I assume you mean how much money you need so you never again have to generate outside sources of income beyond your investments and investment income (e.g., interest and dividends)?

Because retirement to you does not mean sitting on a beach and drinking piña coladas. It’s simply the ultimate expression of financial freedom such that you have the time and space to do what you want to do. Perhaps that means spending more time working on open source projects or learning a new programming language or even picking up a new skill altogether outside of coding.

I’ve been asked this retirement question many times in person, and so today I give you an answer in writing.

First off there’s good news and bad news.

The bad news is there is no such thing as one, big, blinking bright light retirement number that once you reach, it’s all flowers and balloons and candy and retirement from here on out. Because personal finance is personal and thusly your retirement number is unique to you. And because life is fluid and circumstances change, which means your retirement number might vary over time and you’ll have to make mid-game adjustments.

The next best thing is a number you can use as a compass of sorts, as a North Star to help guide you on your journey to avoid working for the man or the woman. And the good news is such a number exists. And you can use it as your North Star to approximate your way towards retirement. The number is derived from what I call the Chocolate Retirement Formula:

25 x your yearly expenses = Chocolate Retirement Number

Which means you need to accumulate an amount of money that’s equal to 25 times your yearly expenses. When you’ve achieved that figure, at that point you can “retire” (I put in quotes because remember life is uncertain and nothing is guaranteed, particularly in investing).


For example if your yearly expenses are $10,000 per year, then you need $250,000 to retire because:

$10,000 x 25 = $250,000.

If your yearly expenses are $50,000, you need $1,250,000.

If your yearly expenses are $100,000, you need $2,500,000.

And so on and so forth.

Trinity Study

The Chocolate Retirement Formula comes from a seminal paper titled Retirement Savings: Choosing a Withdrawal Rate That Is Sustainable written by three finance professors at Trinity University in San Antonio, Texas. For which the paper is commonly referred to as the Trinity Study.

And the focus of the Trinity Study was to look at “the historical success of various withdrawal rates from portfolios of stocks and bonds.” Success defined as outliving your portfolio. Meaning, the authors sought to determine at what annual withdrawal rate(s) — given 1) an investment time horizon and 2) a certain asset allocation between stocks and bonds — would you not deplete your retirement funds during your lifetime?

And they concluded that 25 times your yearly expenses gives you a good probability (but no guarantee) of outlasting your retirement savings.

If you’re skeptical of this 25x Chocolate Retirement Formula, you should be. In a world as uncertain as investing, you can only arrive at such a formula if you make assumptions. And the Trinity Study 100% made assumptions, which I’ve yet to discuss.

And so let’s get into it: what are the main assumptions behind the Chocolate Retirement Formula?

Three Big Assumptions of the Chocolate Retirement Formula

Assumption 1: Savings are Invested in Market

The assumption is your savings are exposed to Market. That is, your money is invested in some asset allocation between stocks and bonds.

And the probability of success (i.e., not running out of money) is impacted by 1) your investing time horizon (e.g., for how many years will you be in retirement?) and 2) the makeup of your asset allocation (e.g., 75% stocks vs 25% bonds or 80% stocks vs 20% bonds, etc., etc.).

Assumption 2: The Future Looks (Kind of) Like the Past

The authors of the Trinity Study analyzed portfolio success rates under a number of investment scenarios during the years 1926 to 1995. And what would have happened to the funds of a hypothetical investor whose:

  • Retirement lasted any 10, 15, 20, 25, or 30 year period between 1926 and 1995
  • Portfolio withdrawal rate was from 3% to 12%
  • And asset allocation was composed of 100% stocks, 75% stocks — 25% bonds and vice versa, 50% stocks — 50% bonds, or 100% bonds.

And after running the numbers, an annual withdrawal rate of 3% would have predicted a 100% portfolio success rate (i.e., you wouldn’t have run out of money under any scenario). And 4% not too far behind.

The assumption is, however, that in order for a 4% withdrawal rate to make any sense for you going forward, future market conditions are somewhat similar to the market conditions the authors studied.

You might be thinking this is a big assumption. And it is. Because past performance is not a guarantee of future results by any stretch of the imagination. That’s why it’s one of the Three Big Assumptions of the Chocolate Retirement Formula. And that’s why the “25 times” yearly expenses figure is a rule-of-thumb, not a hard and fast rule. Therefore, if you plan to structure your financial life around a Chocolate Retirement Number, be aware there’s no certainty Market will, over time, trend upward.

And the only way I know how to protect against this is to invest in yourself and in skill development—like learning to code or anything to do with software—because that way, even if something happens to your investment portfolio, you can tap your skills portfolio and do something of value.

Assumption 3: You Live on a 4% Annual Withdrawal Rate

The assumption is while living off your Chocolate Retirement Funds, you withdraw 4% of your funds each year to cover your spending needs during that year.

Why 4%?

Remember, the Trinity trio set out to answer the questions:

What is a reasonable withdrawal rate from a portfolio for purposes of planning retirement income? Or stated differently, what withdrawal rate is likely to be sustainable during a specified number of years?

And they determined 4% to be considered more or less the “safe withdrawal rate” at which you can pull money annually from your portfolio over a 15 to 30 year period and not deplete your retirement funds.

If you’d like to see this in action, take a look at the Retirement Nest Egg Simulator by Wealth Meta. This a nifty tool that calculates whether you would outlive your portfolio, just as the Trinity Study aimed to do.

Pretend you have a hypothetical retirement plan that consists of:

  • A $500,000 Chocolate Retirement Number
  • A 4% annual withdrawal rate, which means you live on $20,000 per year
  • A 50 year retirement
  • And an asset allocation of 80% stock and 20% bond

If you plug those numbers into Wealth Meta’s Retirement Nest Egg Simulator, which I’ve done here, you’ll see the results suggest you’d have an 89.9% chance of outliving your funds. And that’s assuming you don’t earn any more money in retirement. Imagine if you did earn some extra cash.


And to bring this full circle, consider once again the Chocolate Retirement Formula:

25 x your yearly expenses = Chocolate Retirement Number

Suppose you spend $10,000 per year. Meaning you need $250,000 to retire. How does the 4% safe withdrawal rate come into play?

Well, what’s $250,000 multiplied by 4%?

Take a second.

It’s $10,000. That is, $250,000 x 4% equals $10,000. And what’s $10,000?

Your yearly expenses.

Which means 4% of an amount of money that’s equal to 25x your yearly expenses equals your yearly expenses! And therefore, so long as your money is invested in Market and paying you interest and dividends and compounding, according to the Trinity Study, you can effectively retire at a 4% withdrawal rate once you’ve accumulated 25 times your yearly spend.

Two Corollaries of the Chocolate Retirement Number and 4% Safe Withdrawal Rate Rule-of-Thumb

1: You know how much money you spend in a year.

This doesn’t mean you have a budget, per se. But it means, you know how much money you spend in a year. Because, in order to calculate your Chocolate Retirement Number, you need to know what your annual expenses are.

2: The less money you need to spend, the faster you can retire because the lower your Chocolate Retirement Number is.

And so it follows that the more expensive the lifestyle, the longer it’ll take to to retire.

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