Creating a Passive Income Symbiote

dollar bills

One of my favorite websites is the fantastic Mr. Money Moustache (MMM).  This website and the book Early Retirement Extreme (ERE) by Jacob Lund Fisker caught my attention a few years ago and the concept of financial independence has been stuck in my head ever since.  There are a number of great podcasts, books, and articles, on the topic and the “FIRE” movement (financial independence / early retirement) has grown into a semi-mainstream concept.

The biggest lesson I took from MMM and ERE is the impact that a person’s savings rate has on the ability to grow wealth.  The flip side to the savings rate is the consumption rate – together they equal 100% of earnings.  The money you earn is either spent and disbursed to another party via consumption – the pizza place, daycare, car payments, etc. – or it is kept and accrued in your accounts – savings, investment account, real estate, etc.

The impact of the consumption / savings rate is laid out most excellently in this post from MMM:

The Shockingly Simple Math Behind Early Retirement

I decided to take a stab at making a simple calculation along the same lines – using a few basic inputs to see the time required to create a “Passive Income Symbiote”.  The goal is to create a passive stream of income equivalent to gross earnings – to entirely replace wage earnings with passive income.  If you can live on what you currently earn then it’s easy to imagine living on that same amount, but with all of your time free to use as desired.  I chose the word symbiote with the idea that the goal is to have the Passive Income Symbiote be the “host” and the person becomes the “parasite”, living on the efforts of the host.

The basic elements for the calculation (spreadsheet attached, feel free to use and share if you like) are:

  • Income / earnings – how much you make
  • Consumption rate – how much of your earnings you spend
  • Return on investments – what you earn on your savings
  • Earnings increase – if you expect an annual raise, how much it is
  • Earnings increase spent – how much of any earnings increase you spend (also known as lifestyle inflation)

Many of these factors are hard to change or controlled by outside forces – bosses, annual evaluations, how the stock market performs – the spending / saving ratio is the factor easiest to quickly adjust.  It’s also the factor that has the most impact on the time required to fully fund a PI Symbiote.  I’ve included some suggested ranges for items like return on investments and annual earnings increase.  There’s a relative limit on some items and I’ve tried to based the suggested ranges on my perception of those general limits. (You might get a 100% raise at your job but it’s more likely to be a moderate increase of 3-5%, for example.)

Good luck on your journey and creating your own pet Symbiote. Cheers!

Screenshot of sample Symbiote calculation
a journey of a thousand miles starts with a shaky bridge

Download Excel Below:

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John P Anderson

I'm a Kansas native living in San Diego. I enjoy learning about environmental issues and connecting with good people that want to make the world a better place. Cheers!

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