Making Decisions with a Margin of Safety

Among all his teachings, one of my favorites is the idea of evaluating opportunities using a margin of safety. While rooted in investing, it’s really a decision-making framework you can apply to any meaningful choice in life. It can help us navigate uncertainty, leave room for error, and make better choices.

Success isn’t about nailing every decision. It’s about staying in the game long enough for your good decisions to compound while simultaneously avoiding disastrous ones.

Applying a Margin of Safety to Your Finances

As advisors, we’re fortunate to see a wide range of how people live, spend, save, and make decisions. We work with young professionals, families in their peak earning years, and retirees living the dream. Through those experiences, we see patterns of what tends to work, what tends to break, and how people’s priorities and needs evolve over time.

When we build financial plans, we use conservative but realistic assumptions around investment returns, inflation, future costs, savings rates, and more. Then we bake in a margin of safety, knowing that the future is unpredictable. This gives our clients a clear roadmap, but also the flexibility to pivot when life inevitably shifts. Here are some ways to build a margin of safety into your own life and finances:

Cash is King

Cash is boring until it’s not. Having a healthy emergency fund prepares you for the unexpected, and not every “unexpected” moment is a crisis. Sometimes it’s a much-needed vacation, a few celebratory nights out, or maybe even a Seattle Mariners playoff push that you have to buy tickets for… (I’m still sad).

All of these, not just emergencies, can squeeze your budget. It’s easy to skip ahead to the idea of investing and take for granted the peace of mind that comes with having a comfortable cushion of cash.

Leaping at the Right Opportunity, Not the First Opportunity

Having patience is hard. When something becomes attainable, the temptation to act can be overwhelming. We see this play out in different ways whether it’s buying your first home, upgrading to a larger one, changing careers, starting a business, or even retiring early.

On the surface, these are major life milestones that feel great in the moment until you realize there are hidden tradeoffs that you didn’t account for because you didn’t give yourself enough time to think it through. Sometimes we make choices because we can, not because they’re necessarily right. 

At the same time, that doesn’t mean you should be slow or indecisive as some opportunities require quick action. But in most instances, it’s worth it to evaluate your options and ensure your actions are intentional rather than emotional. Check out my latest post on this topic: Making Space to Think About the Future.

Borrow Conservatively, Save Aggressively

Debt is a valuable tool when used properly, but it can also lock you into a lifestyle that leaves little room for flexibility or fun. Borrowing conservatively keeps your financial risk manageable.

Saving aggressively is how you keep your budget from feeling tight. Life gets expensive at times (Seattle in the summer, iykyk), and during those moments you’ll want the ability to splurge a bit. If you are consistently saving, whether it’s every paycheck, month, or quarter, you’ll have a buffer you can tap into during those irregular expensive months. 

The sooner you build this habit, the more choices you’ll have in the future. Here’s my favorite hack on building this habit: Automating Your Savings. 

Plan Conservatively

One of the best ways to manufacture happiness is to manage your expectations.

• If you estimate something will cost X, assume it’ll cost X + 15%
• If a remodel is supposed to take three months, assume it’ll take twice as long.
• If investment returns have averaged 10%, expect lower going forward.

Conservative planning protects you from overextending yourself and reduces stress when things don’t go exactly as planned. If it’s better than expected, you’ve created a built-in financial bonus and some happiness. When we build financial plans for clients or help them establish new habits, we naturally lean conservative. It creates a greater likelihood of underpromising and overdelivering on your expectations.

Investing with Patience

I firmly believe that investing early and investing wisely is one of the most effective ways to build wealth, which inherently builds a margin of safety. The earlier you start the better. Check out here and here for more on long-term investing.

A simple, well-diversified, tax-efficient portfolio will allow you to enjoy the good times and ride out the bad, never getting too high or too low. Investing smartly allows people to attain a level of financial security that they otherwise wouldn’t have reached or would’ve taken twice as long or twice the effort to get there. 

Peace of Mind

Building a margin of safety isn’t about living cautiously or approaching life with pessimism. It’s about structuring your life and finances so that surprises don’t derail you and can be a valuable tool for managing your expectations. 

Warren Buffett’s genius isn’t just about picking great investments. It’s his decision making, temperament, and systems that allowed him to take big swings with confidence, knowing he had a margin of safety to fall back on. A margin of safety ultimately creates peace of mind, and in a world full of uncertainty, having that sense of peace is priceless.

If you’re interested in how we might be able to help you, check out our services page.