Money Management

How to Make Your Pursuit of FIRE Sustainable (Without Being Miserable)

By 
Opher Ganel, Ph.D.
Opher Ganel is an accomplished scientist (particle physics), instrument designer, systems engineer, instrument manager, and professional writer with over 30 years of experience in cutting-edge science and technology in collider experiments, sub-orbital projects, and satellite projects.

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What this article covers

Opher Ganel explains why many people chasing FIRE (Financial Independence, Retire Early) burn out: retiring decades early usually means years of extreme frugality, strained relationships and side hustles that turn into a second job. He lays out a three-step framework for a sustainable plan: clarify your top priorities, decide honestly what you’re willing to give up, and choose a side hustle you’d enjoy enough that it doesn’t feel like extra work.

Key Takeaways

1

Your savings rate largely determines how many years it takes to reach FIRE

Using his FIRE matrix, Opher Ganel shows that saving 10% of income to replace 90% in retirement takes about 51 years, while saving 50% to replace 50% takes about 19 years. Saving 75% of income and living on 30% in retirement cuts the timeline to about 10 years, which requires years of ultra-frugal living.

2

Extreme frugality and side hustles make many FIRE plans unsustainable

People pursuing early retirement report skipping weddings, date nights and vacations, and some delay buying a home or having children. Side hustles such as gig work, ride-sharing or renting rooms are really another job, often with difficult clients and underbidding competitors, and many people quit FIRE after months or years of stress.

3

A sustainable FIRE plan starts with priorities, trade-offs and a side hustle you enjoy

Ganel recommends deciding what matters most to you, choosing a maximum savings rate you can live with for years, and running the numbers with his FIRE matrix, including reduced Social Security benefits and the gap until you can claim them. If you add a side hustle, pick one you’d enjoy and set a limit on the hours you can sustain.

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Why Do People Pursue FIRE (Financial Independence, Retire Early)?

“You’re not the boss of me!”

You can almost see the defiant 5-year-old trying to establish his independence.

You can probably still feel that way deep inside where your childhood self lives. Especially when your boss tells you to…

  • stay late on an evening where you set a date with your significant other
  • come in on the weekend when you really needed to unwind
  • “Get me a coffee, sweetheart” when that’s not part of your job description

I used to have a supervisor who would say to us…

  • “Evenings and vacations are for secretaries!”
  • “Working evenings and weekends [without any overtime pay, of course] is for your benefit, letting you get your job done!”
  • “Meetings are no excuse for not getting your job done on time!” This while setting up the 12th multi-hour meeting of the week.

When you experience this sort of thing daily, it becomes crystal clear that something has to change, and if it happened the following day it wouldn’t be quite soon enough.

You start fantasizing about firing your boss.

The term FIRE, standing for Financial Independence, Retire Early, starts taking on a second, more viscerally satisfying meaning.

How Many Years Does It Take to Reach FIRE? It Depends on Your Savings Rate

In “How Soon Can You Reach Your Personal FIRE Point?” I present a matrix that tells you how many years it will take for you to become financially independent, based on the fraction of your income that you save, and the fraction of your income you want to live on in retirement. Here are some examples:

  • You save 10% of income and want to replace 90% of your income in retirement: 51 years
  • Your saving rate is 20% and you want to replace 80% of your income in retirement: 38 years
  • You save 30% of income and want to replace 70% of your income in retirement: 30 years
  • Your saving rate is 50% of income and you want to replace 50% of your income in retirement: 19 years
  • You save 75% of income and want to replace 30% of your income in retirement: 10 years

As you can see, if you haven’t yet saved much for retirement, firing your boss tomorrow isn’t in the cards. In fact, you’d have to become ultra-frugal for years and years, if not decades.

The Hidden Costs of FIRE: Extreme Frugality and Side Hustle Burnout

As stories shared online show, there are real-life costs for being frugal enough to retire super-early. People report turning down close friends’ wedding invitations, skipping date nights, not going on vacation, etc. Others put off plans of buying a home, or in extreme cases even having children.

To increase their income instead of just cutting spending, FIRE adherents often take up a side hustle, such as:

  • Blogging
  • Taking on gigs on Upwork, Fiverr, or similar sites
  • Driving for Uber or other ride-sharing companies
  • Renting out rooms in their house on AirBnB
  • House-hacking by buying a multi-family home, living in one unit and renting out the others.

What these people often don’t realize is that these side hustles and gigs are really another job. One requiring you to deal with some awful clients, where you need to learn to market and compete. In many online gigs, your competitors may live in cheaper countries, so they keep underbidding you.

In general, cutting decades off your FIRE journey requires that you give up enjoying life now for a long time. Realizing it isn’t worth it, many throw in the towel after months or years of misery and stress.

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How Can You Make Your Pursuit of FIRE Sustainable?

If you’re like most people, denying yourself everything that makes life enjoyable for years isn’t sustainable. Similarly, working 70+ hours a week isn’t sustainable for years and decades. This even if you’re well compensated, let alone when starting a side hustle without much to show for it.

So, does that mean your quest for FIRE is doomed?

Not exactly.

Here’s what you should do.

Step 1: Decide What Your Top Priorities in Life Really Are

If your top priority is becoming a couch potato as soon as possible.

  1. Research the least expensive place you can live that sort of life
  2. Figure out the minimum possible amount you need to save to finance that sort of low-cost “retirement”
  3. Resolve to truly give up everything else in service of that future. This might include sharing a home with housemates to reduce your housing costs, giving up vacations and eating out, and moving someplace where you don’t need to own a car.

If instead, your top priority is making a difference in the world without being trapped in a job that holds no meaning for you:

  1. Brainstorm how to change your career path so you can become that person now
  2. Get whatever training you need to be effective in that chosen path
  3. Be relentless in networking with people who are already doing it, so you can change course without having to give up an income-producing job or business

Step 2: Decide What You’re Willing to Give Up to Reach FIRE

If you know yourself to be one of the few who truly can commit to ultra-frugality along with the likely result that most of your relationships will wither away, go for it.

  1. Use my FIRE matrix to figure out how much you need to save and how much you can live on in retirement given the number of years you’re willing to suffer now
  2. Automate your savings and invest those saved amounts as aggressively as possible
  3. Find free or extremely cheap ways of having at least some fun in your current life

If you know that you’re not willing to put most of your relationships and life on pause and on the line, be more strategic.

  1. Decide on a maximal savings rate you’d be willing to live with for many years
  2. Figure out the fraction of your current income you’d be willing to live on in retirement
  3. Subtract from that the fraction of your current income that 77% of promised Social Security benefits will trim
  4. Use my FIRE matrix to figure out how many years you’d need to work given the above numbers
  5. Figure out how much extra you’d need to cover for your Social Security benefits from when you plan to retire until you can claim them

Step 3: Choose a Side Hustle You’d Enjoy Enough That It Doesn’t Feel Like Extra Work

In “Shhhh… The Dirty Little Secret about Money,” I talk about a few possible side hustles.

  • Monetizing your knowledge
  • Buying rental property
  • Creating a product that you can easily and quickly get to market
  • Buying and selling stuff you know about

There are of course other options, including Uber, AirBnB, and various freelancing websites.

  1. Would one of these work for you? If not, think of something else. Consider that you’re already living on your current income, so bringing in more will make it easier to save more.
  2. How many hours would you be willing and able to spend on this side hustle before it becomes unsustainable?
  3. What would you need to make per hour to make FIRE come close enough?

The Bottom Line: Align Your FIRE Plan With Your Priorities

The best way to make your pursuit of FIRE sustainable is to:

  1. Figure out your true priorities in life
  2. Figure out the kind of person you want to be and become that person now – you don’t have to wait until you’re financially independent
  3. Align your choices with your priorities and the person you want to be – this includes where and how you live, what you spend on and how much, and adding only the sort of side hustle that wouldn’t feel like just more work.

Frequently Asked Questions

What does FIRE stand for?

FIRE stands for Financial Independence, Retire Early. Opher Ganel notes that for people frustrated with demanding bosses, the acronym often takes on a second meaning: the appeal of being able to fire your boss.

How long does it take to reach financial independence?

It depends mainly on how much of your income you save and how much of it you want to live on in retirement. In Opher Ganel’s FIRE matrix examples, saving 20% to replace 80% of income takes about 38 years, saving 30% to replace 70% takes about 30 years, and saving 75% to replace 30% takes about 10 years.

What are the downsides of pursuing FIRE?

Retiring super-early usually requires years of extreme frugality. People report turning down wedding invitations, skipping date nights and vacations, and putting off buying a home or having children. Many also take on side hustles that become a second job, and some give up after months or years of misery and stress.

How can you make a FIRE plan sustainable?

Start by identifying your top priorities in life and what you’re truly willing to give up. If you won’t put your relationships on hold, pick a savings rate you can live with for many years, decide what fraction of your income you’d live on in retirement, and use those numbers to estimate how many years you need to work.

Should you start a side hustle to reach FIRE faster?

A side hustle can help, since you’re already living on your current income and extra earnings can go toward savings. Opher Ganel suggests choosing one you’d enjoy enough that it doesn’t feel like extra work, deciding how many hours you can sustain, and figuring out what you’d need to earn per hour to make FIRE realistic.

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Disclaimer: This article is intended for informational purposes only, and should not be considered financial advice. You should consult a financial professional before making any major financial decisions.

Opher Ganel, Ph.D.

About the author

Opher Ganel, Ph.D.

Contributing Writer, Wealthtender

My career has taken some unexpected turns, from earning a PhD in experimental high-energy physics, to conducting cosmic-ray research in Antarctica, to supporting NASA projects and programs, to running my own consulting business. I also run several other small businesses and help my wife run her Marriage and Family Therapy practice.

Those experiences taught me to question assumptions, think critically, and recognize that real-world decisions of any significance rarely have simple answers that apply to everyone. Today, I bring that perspective to writing about personal finance. Drawing on my analytical background, business experience, and research, I explore financial decisions, challenge conventional wisdom, and help readers understand the tradeoffs that can affect their financial well-being. To complement my own research and experience, I also weave insights from financial professionals into my articles, drawing on their expertise and real-world experience helping clients navigate financial decisions and challenges.

At medium.com/@opher-ganel, you can read more of my articles and subscribe to receive email notifications when new ones come out.

Wealthtender is a trusted, independent financial directory and educational resource governed by our strict Editorial Policy, Integrity Standards, and Terms of Use. While we receive compensation from featured professionals (a natural conflict of interest), we always operate with integrity and transparency to earn your trust. Wealthtender is not a client of these providers. ➡️ Find a Local Advisor | 🎯 Find a Specialist Advisor