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The 4 Percent Rule is one of the most highly debated and widely discussed retirement planning strategies out there. This rule is used by financial advisors and retirees alike to determine how much money you need to retire comfortably.

In this article we’ll answer some key questions about the 4 Percent Rule:

  • What is the 4 Percent Rule?
  • Does it Actually Work?
  • How Do You Calculate it?
  • Can it be used for FIRE (Financial Independence Retire Early)?

I’ll also talk about my personal experience with the 4 percent rule and how it has shaped my personal FIRE journey.


What is the 4 Percent Rule for Retirement?

The 4% rule is a widely used retirement planning strategy that basically says that someone can safely withdraw 4% of their retirement portfolio each year and not run out of money.

This rule is based on historical market returns and has been widely adopted as a safe withdrawal rate for retirees.

It assumes that an individual has a diversified portfolio of stocks and bonds and can expect to earn a long-term average return of 7% on their investments.  From this 7%, 4% is used to spend each year and 3% goes towards inflation meaning that your starting amount should continue to grow with inflation as time goes on.


The Trinity Study and the 4% Rule

The Trinity Study is a famous research paper in the field of retirement planning that helped establish the 4% rule as a widely accepted guideline for determining a safe withdrawal rate. The study was conducted by three professors at Trinity University in Texas: William Bengen, David Blanchett, and Philip Cooley.

The Trinity Study analyzed historical stock and bond market data from 1926 to 1995 and concluded that a portfolio consisting of 50% stocks and 50% bonds, with an initial withdrawal rate of 4%, had a high likelihood of lasting for at least 30 years. This conclusion was based on the assumption that the withdrawal rate would be adjusted annually for inflation.

The 4% rule has since become a widely recognized guideline for retirees to determine their safe withdrawal rate, although it’s important to keep in mind that past performance is not a guarantee of future results and that other factors, such as an individual’s age, spending habits, and portfolio mix, can impact the sustainability of retirement income.


Does the 4% Rule Really Work?

The basic idea is that you can safely withdraw 4% of your portfolio and never run out of money.  The math is actually pretty simple, average a 7% return on investments, take out 4% and that leaves 3% left over to cover inflation.

The main problem is that the 4 percent rule relies on assumptions and historical data and for any given year, the stock market return (or loss) and inflation might be wildly different than the historical averages.  2022 was an extreme example of this where the stock market went down about 20% and inflation went up about 6.5%.  

For the 4% rule to work, years like 2022 need to be an anomaly and the average returns of the stock market, as well as inflation need to return to their historical averages.


In 2023 the S&P 500 returned about 24% and inflation was at 4.1%.

As of June 2024 the S&P 500 is up by about 14% and inflation continues to fall towards the Fed’s target of 2%.

Is 4% a Safe Withdrawal Rate?

The safe withdrawal rate (SWR) is the amount that you can withdraw annually from your retirement savings without running out of money. It is a crucial factor to consider when planning for retirement, as it helps determine the sustainability of your retirement income.

The traditional rule of thumb for the safe withdrawal rate is 4% of your initial retirement savings, adjusted annually for inflation. However, this figure is based on historical stock and bond market returns and may not hold true in the future.

It’s important to understand that the safe withdrawal rate can vary depending on a number of factors, including your age, the size of your retirement savings, the investment mix in your portfolio, and your spending habits. A financial advisor can help you determine a personalized safe withdrawal rate based on your individual financial situation.

It’s also crucial to have a plan in place for dealing with market downturns, inflation, and other potential challenges to ensure that your retirement savings last throughout your lifetime.

How to Calculate the 4 Percent Rule:

The Standard 4 Percent Rule:

This method involves determining the amount of savings you will have at retirement, and then multiplying that figure by 4% to determine your annual withdrawal amount.

For example, if you have $500,000 saved for retirement, you would multiply $500,000 by 4% to arrive at an annual withdrawal amount of $20,000 ($500,000 x 0.04 = $20,000).

This approach is based on the assumption that you will withdraw 4% of your savings in the first year of retirement, adjust the withdrawal amount annually for inflation, and continue this withdrawal rate for a period of 30 years or more.


The Inverse 4 Percent Rule:

The Inverse method is also known as the 25x Rule for Retirement involves determining the amount you expect to spend annually in retirement and then multiplying that figure by 25 to determine the size of the retirement portfolio you will need.

For example, if you expect to spend $20,000 per year in retirement, you would multiply $20,000 by 25 to arrive at a retirement portfolio of $500,000 ($200,000 x 25 = $500,000).

4% Rule vs Inverse 4% Rule

$500,000 x 4% = $20,000

$20,000 x 25 = $500,000

Factors that Affect the 4% Rule

The 4% rule is a useful tool for retirement planning, but it is important to note that it is based on historical market returns and may not hold true in the future. The following are some factors that can affect the 4% rule and the amount you need to retire comfortably:

Market performance: The performance of the stock market and the return on your investments will affect the amount you can safely withdraw each year. A downturn in the market can reduce the value of your portfolio, leading to a lower withdrawal rate.

Inflation: Inflation is a measure of the increase in prices over time and can significantly impact the amount you need to retire comfortably. The 4% rule assumes a 3% inflation rate, which has been the average for decades but was much higher in 2022 and 2023.

Longevity: The average lifespan of individuals is increasing, leading to longer retirement periods. This can affect the amount you need to retire comfortably and may require you to save more or reduce your withdrawal rate.

Social Security: Social Security is a significant source of retirement income for many individuals. The amount you receive from Social Security can impact the amount you need to retire comfortably.

Four Percent Rule and FIRE Financial Independence

The 4% rule is often used as a starting point for retirement planning, and many FIRE enthusiasts may use a lower withdrawal rate to ensure that their portfolio lasts longer. For example, some FIRE proponents may use a withdrawal rate of 3% or 2.5% to provide a larger margin of safety and ensure that their portfolio lasts through their lifetime.  It all depends on which type of FIRE you’re going for.  You can also work part time (BaristaFIRE) so that you can give yourself some extra leeway.

So while the 4% rule can be a useful starting point for FIRE planning, it’s important to consider your own financial situation and goals, and to be flexible and adjust your withdrawal rate as needed. Working with a financial advisor or retirement planning specialist can help you determine the right withdrawal rate for your specific needs and goals.


4% Rule Variations

Dynamic Withdrawal Strategy:

This strategy adjusts the withdrawal amount based on the performance of your portfolio. In years where your portfolio performs well, you can withdraw more than 4%. Conversely, in years where your portfolio doesn’t perform well, you may need to withdraw less than 4%.  If you can be flexible with your fixed expenses, then you will not NEED to withdraw the full 4% every year.

Another way to achieve a Dynamic Withdrawal Strategy is to not take the inflation increase in a down year.

For example, if you have $1,000,000 in year 1 then the 4% Rule will give you $40,000 to withdraw for that year.

With an average inflation rate of 3%, you can then withdraw 4% from $1,030,000 which is $41,200 which is an increase of $1,200 from the previous year.

However, if the stock market was down this year, then don’t give yourself the 3% increase.  Keep your withdrawals at the same amount as last year.  This will help balance things out in a down year and give you a sense of control over the situation.


Pros and Cons of the 4 Percent Rule


Simple and easy to understand: The 4% rule is a simple and straightforward guideline for retirement planning that is easy for most people to understand and apply.

Provides a starting point: The 4% rule provides a good starting point for retirement planning, allowing individuals to estimate how much they need to save and how much they can safely withdraw.

Historically proven: The 4% rule is based on historical data and has been shown to be effective in providing retirement income for many retirees over the years.

Offers flexibility: The 4% rule offers a flexible approach to retirement planning, allowing individuals to adjust their withdrawals based on their changing financial needs and market conditions.

Provides peace of mind: Following the 4% rule can provide retirees with peace of mind, knowing that they have a reliable source of retirement income that is likely to last throughout their retirement.


Assumes a static withdrawal rate: The 4% rule assumes a static withdrawal rate, which may not be appropriate for retirees who have changing financial needs or who experience significant market fluctuations.

May not be appropriate for all retirees: The 4% rule may not be appropriate for all retirees, especially those who have significant debt, health issues, or other financial obligations.

Doesn’t consider taxes: The 4% rule doesn’t consider taxes, which can have a significant impact on a retirees’ income and spending.   Withrawing Long Term Capital Gains instead of Short Term can be an effective strategy to avoid a big tax bill during retirement.

Relies on past performance: The 4% rule is based on historical data and may not be applicable to future market conditions or changes in the economy.

Overall, the 4% rule can be a useful starting point for retirement planning, but it’s important to consider all factors that may affect your retirement income and consult with a financial advisor to determine the best approach for your individual situation.


My Personal Experience with the 4% Rule

I started out on my FIRE journey in 2022 when I sold my online business and reached about $500,000 in net worth at the age of 36.  With the 4% rule, that meant that I could spend $20.000 a year and never have to get a job.

To most people, $20.000 a year isn’t nearly enough but luckily for me I had already been living abroad for the past 10 years and was living comfortably on about $20,000 in Taiwan.

The Results:

2022 – This was a rough year for stocks and I ended up down $34,000 for a total networth of $466,000

2023 – Things started turning around and I gained about $66,000 without having to work for a total networth of $532,000

2024 – The S&P 500 has reached numerous all time highs and so far I’m up about $43,000


The four percent rule is a decent starting point for retirement planning and while it might look simple on a spreadsheet, in reality it is a roller coaster and you just need to stay the course and hang on.