Lean FIRE is an extra-frugal approach to the Financial Independence, Retire Early (FIRE) movement that emphasizes minimal living expenses and a simplified lifestyle.
Historically, Lean FIRE (also known as LeanFIRE or Lean FI) meant aiming for early retirement by curating a lifestyle that works on less than $40,000 a year, or about $3,300 per month. But these numbers are from 2000s and 2010s internet forum culture. Broadly, Lean FIRE places more emphasis on frugality best practices.
In this article, we'll do an overview of Lean FIRE, including how to calculate your FIRE number and whether this financial goal is right for you.
- Lean FIRE promotes early retirement through frugal living.
- Proponents live below their means, historically aiming for an annual budget of $40,000 or less.
- The Lean FIRE approach includes strict budgeting and smart investing.
- Adapting the Lean FIRE philosophy to one’s personal life involves careful planning, since there is less wiggle room in the budget.
What is lean FIRE?
Financial Independence, Retire Early (FIRE) is a movement gaining momentum around the globe, and Lean FIRE is one of its popular subsets. It’s a lifestyle built on the principles of simplicity, minimalism and frugality.
Perhaps you know someone who follows Lean FIRE principles. Perhaps that person is you! It's stuff like living in a smaller home, driving a used car, and engaging in DIY projects to keep expenses low. Lean FIRE people pinch pennies, and for good reason: They want to achieve financial independence and retire early.
Tip:In some online forums, Lean FIRE is styled as one word: LeanFIRE. This formatting applies to other subsets of FIRE, too.
Generally, Lean FIRE adherents aim for an annual retirement budget of around $40,000 or less. This number is derived from the FIRE number, the amount of invested assets you need to live off of annual interest alone.
The FIRE number and the 4% rule
So how do you calculate your FIRE number?
The way FIRE works is that you save up enough money such that you could live off annual interest gains on your investments, without having to touch the principal.
Many use the 4% rule as a benchmark for how much they expect their investments to gain each year. This percentage comes from The Trinity Study, a 1998 research paper that measured withdrawal rates from stock and bond portfolios using historical data. It found that a draw of 4% per year had a near-zero chance of depleting savings after 30 years.
To calculate your FIRE number using the 4% rule, divide your expected annual retirement expenses by 4% (divide by 0.04). Another way to think of this is to multiply by 25.
Formula:Annual Expenses x 25 = FIRE Number (approximate).
For example, if you want $40,000 a year in passive income, your FIRE number would be $1 million ($40,000 x 25). Know that this figure is an estimate and will depend on inflation and your own circumstances.
Essentials of lean FIRE
At its core, the Lean FIRE movement is about minimalist living, strict budgeting and smart investing. From downsizing your living space to cutting non-essential expenses, every decision you make is a factor in reaching your financial independence and early retirement goals.
First and foremost, a lean budget
Budgeting is the lifeblood of the Lean FIRE lifestyle. It’s not just about tracking your expenses; it’s about understanding where your money goes and finding ways to cut costs without sacrificing your quality of life.
Creating a Lean FIRE budget helps you:
- Identify cost-cutting opportunities.
- Set a savings goal, often referred to as your FIRE number.
- Calculate your FIRE number as 25 times your annual expenses in retirement.
Tip:Some savers take a more conservative approach to their FIRE number, using a 3% rule, or 33 times annual expenses in retirement.
To reduce expenses, Lean FIRE enthusiasts align their spending with true value. This may involve:
- Purchasing used items.
- Utilizing public transportation.
- Cooking at home.
- Downsizing your home or apartment.
Eliminating or reducing debt can further alleviate financial stress and bolster your financial foundation.
Invested assets
While budgeting is crucial to Lean FIRE, investing is the engine that drives your wealth growth.
Building a diversified portfolio through low-cost, passive investment methods such as index funds and ETFs is key to accelerating your wealth creation. Lean FIRE enthusiasts often invest a significant portion of their savings, harnessing the power of compound interest to grow their wealth over time.
By navigating market ups and downs with wisdom and resilience, you can ensure the long-term viability of your Lean FIRE plan.
A minimalist lifestyle
Your lifestyle choices play a significant role in your Lean FIRE journey. The Lean FIRE lifestyle is about more than just saving and investing; it’s about living within your means and making conscious decisions that align with your financial goals.
Crafting your lean FIRE plan
Formulating a custom Lean FIRE plan involves the following steps:
- Calculate your FIRE number.
- Set milestones.
- Craft an investment strategy.
- Continuously monitor your expenses.
Calculate your FIRE number
Your FIRE number is a crucial factor in your Lean FIRE journey. It’s the total amount you need in your investment portfolio to be considered financially independent.
Remember, the goal is not to amass a fortune, but to achieve financial independence that allows you to retire early and live a life of freedom and fulfillment.
Set milestones along the way
Setting financial milestones is another crucial step in crafting your Lean FIRE plan. These milestones help you track your progress, stay motivated, and stay focused on your early retirement goals.
Short-term milestones can involve achieving a particular saving rate or fully funding an emergency account. Long-term milestones, on the other hand, could involve reaching a certain net worth or investment portfolio size.
Celebrating these milestones can provide a psychological boost, reinforcing your positive financial habits and keeping you focused on your goals. When you reach a milestone, take the time to celebrate your progress. Every step you take brings you closer to your dream of financial independence and early retirement.
Lean FIRE drawbacks
As with any journey, the Lean FIRE path comes with its own set of challenges. Life circumstances change, and unexpected hurdles can crop up along the way. Being adaptable and flexible is key to navigating these challenges and staying on track towards financial independence.
Unexpected costs are harder to manage
Unexpected costs can throw a wrench in your Lean FIRE journey.
Building an emergency fund is one way Lean FIRE followers manage unexpected costs. This fund serves as a safety net, helping you cover surprise expenses without dipping into your retirement savings.
On top of building an emergency fund, Lean FIRE individuals also prioritize personal health to prevent costly medical expenses that can threaten their financial security. Some even relocate to areas with lower living costs as a proactive approach to mitigating unexpected costs.
These strategies not only help manage unexpected costs but also ensure that you stay on track towards achieving your financial independence.
Markets inevitably shift
Market fluctuations are another challenge that you may face on your Lean FIRE journey.
Investing in a diversified portfolio and focusing on stable assets can lead to steadier returns and help you navigate market turbulence effectively. Consider guaranteed-income options like bonds, which can also offer a reliable source of income in retirement and reduce your dependency on market performance.
Other types of FIRE
Despite Lean FIRE presenting a route to early retirement and financial independence, it’s not for everyone. There are several alternative paths to financial freedom, each with its own advantages and challenges.
What's the difference between Lean FIRE and Coast FIRE?
Lean FIRE means you can start working, whereas Coast FIRE is a point at which you've frontloaded investments enough that you can start to save less and still get to your FIRE number on time. In Coast FIRE, you’re not actually retiring. Instead, you hustle earlier in life to frontload your retirement assets, then let compound interest carry you the rest of the way. You could then free up retirement contributions in your budget and use that money for other things, or downshift to a less stressful job. Once you hit your Coast FI number, you'll have that option.
Lean FIRE is a higher wealth target, but lets you be fully work-optional.
What's the difference between Lean FIRE and Barista FIRE?
Lean FIRE means you're fully financially independent, whereas Barista FIRE means you can stop working a stressful or demanding job and move down to something that's easier, but still produces earned income. Barista FIRE is another alternative path to financial freedom. It involves saving enough to retire, then subsequently working less or part-time while continuing to engage in income-generating activities. For many, Barista FIRE represents a gradual transition into retirement, offering structure and a sense of purpose.
Barista FIRE isn’t just about working part-time. It’s also about diversifying your income streams. This could involve part-time employment, entrepreneurship, or even real estate. For some, the decision to pursue Barista FIRE is motivated by a desire to focus on work that aligns with personal values and leads to satisfaction.
If you’re looking for a balanced approach to early retirement, Barista FIRE could be a good option.
What's the difference between Lean FIRE and regular FIRE?
Lean FIRE requires a lower FIRE number, so you can retire sooner, but you'll have to live on a more frugal budget. Regular FIRE serves as a middle ground between Lean FIRE and Fat FIRE, as is often considered a more traditional fire approach. It targets financial independence with a balance between living modestly and having extended financial coverage.
Those who follow the Regular FIRE path usually save less aggressively than Lean FIRE adherents but more so than those aiming for Fat FIRE. In online circles, this target number is typically $1 million to $2.5 million, although these numbers were established in the 2000s and may no longer be realistic.
Investment strategies for Regular FIRE often involve:
- A diversified portfolio of stocks, bonds, and other assets to grow wealth over time while managing risk.
- A balanced approach that allows for the occasional indulgence without derailing your financial goals.
- A lifestyle that includes some discretionary spending and comfort but avoids the excesses of a Fat FIRE lifestyle.
What's the difference between Lean FIRE and Fat FIRE
Lean FIRE means a lower FIRE number because you're willing to keep expenses very low in retirement, whereas Fat FIRE requires a much higher FIRE number. For those who dream of a luxurious retirement, or need the funds to continue living in a city or take care of loved ones, Fat FIRE is the way to go.
This approach targets a higher standard of living in retirement, which means you’ll need to save significantly more than you would with Lean FIRE or Regular FIRE, usually at least $2.5 million in assets.
Achieving Fat FIRE requires a disciplined approach to finances, high levels of income, and a strategic savings and investment plan.
The benefits of the Fat FIRE lifestyle are enticing. You’ll have the luxury of retiring without mandatory work and the financial freedom to provide substantial support to family members. It’s a path that requires more effort and resources, but the rewards are equally substantial.
What are some good books about FIRE?
- Your Money or Your Life by Vicki Robin & Joe Dominguez is a foundational read that offers a unique perspective on money and time.
- Money Proud is an introduction to the principles that lead to FIRE, tailored toward LGBTQ+ people and written by Out magazine finance columnist Nick Wolny.
- The Simple Path to Wealth by JL Collins simplifies the complex topic of investing for financial freedom.
Other notable reads include Early Retirement Extreme: A Philosophical and Practical Guide to Financial Independence by Jacob Lund Fisker and Playing with FIRE by Scott Rieckens. Both provide comprehensive FIRE strategies and engaging personal narratives that inspire and guide you on your financial journey.
Frequently asked questions
How do you calculate lean FIRE?
To calculate your Lean FIRE number, multiply your annual expenses by 25. This will allow you to withdraw 4% per year from your portfolio relatively safely.
What is the minimum for lean FIRE?
To achieve lean FIRE, it's historically been suggested to have at least $1 million in after-tax investments generating $40,000 a year in passive income, assuming the 4% rule.
Is Lean FIRE right for you?
Embracing the Lean FIRE lifestyle means dedicating oneself to frugality. It’s a journey that requires discipline and commitment, but can ultimately lead you to time freedom and simplicity. And that might be the meaning of life.
Take the time to figure out which financial freedom path resonates with you before it's too late. ◆
