How much should you invest - the Goldilocks Rule

I'm currently engrossed in James Clear's insightful book, "Atomic Habits." In a recent chapter, Clear introduces the fascinating concept of the Goldilocks Rule for habit formation. This principle suggest that individuals are more likely to abandon habits that fall on either extreme of the difficulty spectrum - those that are excessively challenging or overly simplistic. Clear's argument is that people naturally gravitate towards activities that hover just at the periphery of their current capabilities - tasks that are neither overwhelmingly difficult nor boringly easy. This sweet spot of challenge is what gives the rule its "Goldilocks" moniker, reminiscent of the classic fairy tale where the protagonist seeks the perfect balance.

Interestingly, the realm of personal finance harbors a parallel concept, particularly in the domain of investment risk-taking. The Goldilocks rule of investing advocates for a carefully calibrated equilibrium between risk and potential reward. It's a fundamental tenet in finance that generally, the higher the risk an investor is willing to shoulder, the greater the potential returns they might reap. However, this relationship isn't linear, and finding the right balance is crucial.

Building on this concept, I believe there's yet another application of the Goldilocks Rule that's particularly relevant to personal finance - determining the ideal amount to invest. This application seeks to find the 'just right' investment level that balances current financial needs with future financial security.

In my latest publication, "Stress-Free Finances," I propose a guideline of allocating 15% of your take-home pay towards investments as a solid starting point. This benchmark serves as a balanced target that can help many individuals build substantial wealth over time without overly constraining their current lifestyle.

It's crucial to note, however, that the true 'Goldilocks number' for investing is not a one-size-fits-all figure. It's a highly personalized metric that fluctuates based on your unique financial landscape. Factors such as your income level, living expenses, debt obligations, short-term financial goals, and long-term aspirations all play pivotal roles in determining your optimal investment rate. What might be the perfect amount for one person could be insufficient or excessive for another.

To help you navigate this complex terrain and pinpoint your personal Goldilocks investment rate, I've developed a comprehensive, step-by-step approach:

Determining How Much You Should Invest

Step 1: Ascertain Your Discretionary Income

The foundation of this process is creating a detailed, comprehensive budget. Understanding your discretionary income - the money left over after accounting for all necessary expenses - is crucial in determining how much you can comfortably allocate to investments. If you haven't already established a budget, now is the perfect time to do so. This exercise will provide invaluable insights into your financial situation.

When constructing your budget, it's important to factor in any existing investments you're making. This includes contributions to retirement accounts such as 401(k)s or IRAs. These are often overlooked but form a significant part of many people's investment portfolios.

Step 2: Prioritize Other Financial Objectives

While I may not align with all of Dave Ramsey's financial philosophies, there's one point on which we find common ground: it's generally inadvisable to prioritize investing if you're lacking an emergency fund or burdened with substantial high-interest debt. These financial elements form the bedrock of financial stability and should typically be addressed before ramping up your investment efforts.

However, it's worth noting that there's an important exception to this rule. If your employer offers a company-matched investment plan, such as a 401(k) with employer contributions, it's often beneficial to participate in these programs even if you're still building your emergency fund or paying down debt. The potential for 'free money' in the form of employer matching can provide a significant boost to your long-term financial health.

Step 3: Initiate Your Investment Journey

Don't let perfection be the enemy of progress. If you find yourself unable to immediately hit the 15% investment benchmark, don't let that deter you from starting. The key is to begin investing with whatever amount you can currently afford, rather than postponing until you can meet a specific target. This approach leverages the power of compound interest, allowing even modest initial investments to grow substantially over time. Remember, every dollar you invest today has the potential to work for you in the future.

Step 4: Establish a Concrete Retirement Goal

Determining how much to invest becomes significantly easier when you have a clear goal in mind. Through my complimentary financial planning service, I assist clients in calculating the amount they need to have invested by retirement to meet their desired income goals. This process is comprehensive and takes into account various factors including inflation rates, projected investment returns, and the client's target retirement age.

Setting a specific retirement goal is invaluable as it illuminates any potential shortfalls in your current financial strategy. If you identify a gap between your projected savings and your retirement goals, you'll need to explore ways to increase your investments over time or adjust your expectations for retirement income. This foresight allows you to make informed decisions and necessary adjustments well in advance.

Step 5: Exercise Spending Discipline

While this step might seem even less appealing than adhering to a strict budget, it's absolutely crucial for achieving long-term financial peace of mind. Controlling your spending habits is often the key to unlocking your investment potential.

I've come across numerous reports indicating that between 50% to 60% of individuals proportionally increase their spending when they receive a pay raise. Here's the pivotal insight: as your income grows, resist the temptation to increase your spending at the same rate. Instead, channel that additional income into your investments. This strategy, often referred to as "avoiding lifestyle inflation," can dramatically boost your investing power without feeling like a significant sacrifice in your day-to-day life.

By incrementally increasing your investment contributions as your income grows, you'll find yourself steadily approaching - and potentially surpassing - that 15% benchmark. It's important to remember that the Goldilocks Rule isn't about achieving perfection; it's about finding the right balance for your unique situation and consistently working towards your financial goals. This approach allows for flexibility and growth, ensuring that your investment strategy evolves alongside your financial journey.


Ok, if you’ve made it this far, I should take this opportunity to point you towards my latest book, Stress-Free Finances. In it I share 25+ years of experience in personal finance, where I teach you everything I know about creating a stress-free financial life.

Thank you for subscribing!
Please check your inbox for a link to confirm your email address.

Read past issues

Oct 20
How much should you invest - the Goldilocks Rule
Oct 13
From Idea to Bookshelf: How to Self Publish Your Next Book
Oct 06
Your value proposition sucks
Oct 02
Rich Dad Poor Dad (Robert Kiyosaki) - Book Notes & Summary
Sep 29
4 Skills that will Drastically change your life
Aug 03
Die With Zero (Bill Perkins) - Book Notes & Summary
Jul 28
Afraid of giving away too much equity to investors? Here’s the fix.
Jul 14
"Known (Mark W. Schaefer) - Book Summary and Notes"
Jul 06
The surprisingly simple purpose of a seed round of funding
Jun 29
When it's an easy decision to pass on startup funding
Jun 15
Go-to-Market Made Easy: Your Roadmap to Customer Acquisition
May 24
Planning for a Second Act + a sabbatical
May 05
This isn't 2008. But, it's not that much better
Apr 20
Market Whisperer: Knowing Your Customer Better Than Investors
Apr 14
Energized > Rested
Apr 07
Numb the pain, silence the teacher
Mar 31
The Myth of the Big Exit
Mar 23
Growth Gears: Equity vs. Debt - Fueling a Startup’s Journey
Mar 16
A candid conversation about fear
Mar 09
The Technical Product Managers Guide to Go-to-Market
Mar 03
My goal was 100 financial plans. I did 10x that goal.
Feb 25
Poor MVP, no one likes you
Feb 24
Beyond Bytes: Why Interpersonal Skills are the New Power Tools for Success
Feb 17
This one question changed how I looked at contingency plans
Feb 10
From $100k -> $75M - this week's fundraising lessons
Jan 27
The next big finance opportunity
Jan 20
This is how long a startup funding round lasts
Jan 09
How I'd market a loan broker business
Jan 02
25+ years of finance experience in less than 5 minutes
Dec 28
How to have a stress-free relationship with money
Dec 17
How to buy a business with little money down
Dec 12
Want to 10x your business? Try the strategy that most people fear.
Dec 05
Why being loan-specific as a loan broker is best
Nov 28
The Power of Micro Markets
Nov 19
Defining success criteria helps remove analysis paralysis
Nov 12
Lessons from acquisitions
Nov 07
My business plan cheat code
Oct 28
Everyone is missing the real point about being overworked
Oct 22
Why you should have a "How to work with me" manual
Oct 18
Selling eggs - my quiet ambition
Oct 13
Breaking Free from 'Meh': The Hidden Impact of a 7 Rating in Life
Sep 24
From Software Engineer to Commercial Loan Broker
Sep 23
A personal message about the importance of your health
Sep 16
Is the SBA 8(a) program going away?
Aug 21
What is a search fund?
Aug 14
My guidelines for speaking engagements
Aug 07
The Ultimate Guide to Picking the Perfect Lender for Your Business
Aug 05
Built to sell - pricing strategies that work
Jul 22
My framework for building impervious value propositions
Jul 12
How to force tradeoff decisions
Jul 09
How I'd Start a Freelance Business Today
Jul 05
The Bookends of Product Management
Jun 28
From the C-suite to Product; How I got here and what you can learn from that
Jun 17
My Digital Detox Experience
Jun 10
AI copywriters wrote this blog post
Jun 03
The SBA Just Made Business Acquisitions Easier
May 27
The power of index investing funds
May 20
The most important skill for entrepreneurs
May 06
I churned out 46,000 words in 90 days using this writing process
Apr 29
⏰ NOW is the time to turn your finance career into entrepreneurship!
Apr 22
How to build your own financial plan in under 1 hour
Apr 15
Define your audience first, then design your product
Apr 08
Getting a business loan just got harder
Mar 25
This one question is jet fuel for productivity
Mar 24
Are the rate hikes over?
Mar 18
This tool removes decision fatigue
Mar 11
The one stat keeping us out of a recession
Mar 05
One key reason raising startup funding is so hard right now
Mar 04
My framework for quickly launching profitable products
Feb 16
What’s the average business loan interest rates?
Feb 13
Everything you need to know about business loan rates
Feb 10
This one tool made me a better entrepreneur
Jan 25
This one-pager is perfect for brainstorming business ideas
Jan 18
Stop making this mistake with your startup’s target market
Jan 11
Powerful tools for researching competitors
Jan 08
User persona template demo
Jan 04
They should take my Marketing degree away
Jan 01
How to confidently charge your worth
Oct 02
Building wealth with Restricted Stock Units (RSUs)
Sep 11
What I’ve learned as a startup analyst for an angel investing syndicate
Jun 24
My favorite economic analysis tools
May 29
Which SBA Loan Has the Lowest Down Payment?
May 01
The Power of a Decision Matrix
Apr 24
Things to consider when buying a business
Apr 17
Buy a Business vs. Start One
Mar 31
How do Micro SBA Loans work?
Mar 03
Common Investor Term Sheet Components
Feb 15
3 Step Process for Generating Business Ideas
Feb 06
Thoughts on <my first Angel Investment>
Jan 11
Lessons from writing over 1,000 words per day
Jan 06
There Are Two Main Types of Business Plans
Dec 09
The Best Pitch Deck Templates