How Much Is Enough to Retire? Understanding Your Satiation Number

Pick a retirement number. Any number. Perhaps you already have one in mind. 

Now answer this: what does that number buy you? 

What does the day after you hit it look like? What changes, specifically, and what doesn’t?

Most people can’t answer these questions. While a number is directionally helpful, it doesn’t conceptualize the life it’s supposed to fund.

So, I’d like to share the concept we use instead: the satiation number. What it is, how to calculate yours, and why getting this right is integral to a fulfilling retirement.

The Limits of Standard Retirement Rules 

The financial planning industry has spent decades building frameworks to answer “how much do I need to retire?” 

Two have become standard:

The 4% rule — a guideline suggesting that withdrawing 4% of your portfolio annually is historically sustainable over a 30-year retirement horizon, assuming a diversified portfolio and moderate inflation. It’s well-researched, widely cited, and useful as a starting point.

The 25x rule — its corollary. Multiply your expected annual living expenses by 25 and you have your retirement target. A $200,000 annual lifestyle implies a $5 million portfolio. Clean, simple, directionally accurate.

However, these standards for financial independence are intrinsically defensive. They are designed to prevent you from running out of money, not to ensure you enjoy the one life you get to live. They treat your retirement spending as a static, flat-line cost, like a utility bill, ignoring the reality that human life is messy and inherently inconsistent.

We are told that if we solve for the math, the life will naturally follow. That’s the great lie of wealth management. You can optimize a portfolio for 30 years and still reach the finish line only to realize you’ve built a massive engine for a car you no longer want to drive.

The Case for a Satiation Number

The satiation number is a different kind of target. Not a portfolio balance derived from a withdrawal rate, but a personalized threshold, the point at which more stops adding optionality or peace of mind to your life.

Behavioral economics has been making this case for years. Research has found that beyond a certain level of financial security, additional wealth produces diminishing returns on wellbeing. A 2023 study by Killingsworth, Kahneman, and Mellers found that while experienced happiness continues to rise with income for most people, the rate of gain slows substantially. More money doesn’t stop helping. It just helps less.

The satiation point isn’t the same for everyone. It depends on what you want your money to make possible. But it tends to organize around three things:

Freedom: the ability to stop doing things you don’t want to do. Stop working for income you don’t need. Stop tolerating relationships or obligations that don’t serve you. Freedom is the baseline.

Optionality: the ability to pursue the things you do want to do, without constraint. Travel when you want, give generously, support the people you love, change course when life asks you to. Optionality is what freedom makes possible.

Psychological safety: the underlying confidence that your plan can withstand stressors. A bad market year doesn’t upend it. An unexpected health event doesn’t cripple your personal finances. 

Once all three are present, you’re at the satiation point. If the number keeps moving, one of them usually isn’t.

How to Calculate Your Satiation Number

Step One: Define Your Target Lifestyle

Before touching a spreadsheet, be specific about your version of retirement. 

Where do you live, and in what kind of home? How often do you travel, and how? What does your household spend annually on the things that genuinely matter? What do you want to be able to do for your children, your grandchildren, the causes you care about?

Then put a present value on all of it. Every major spending category, every anticipated one-time cost, every commitment or obligation you anticipate. Healthcare across a 30-year horizon. Education if grandchildren are part of the picture. A second home, if that’s part of your envisaged life. Charitable giving, if that’s a priority.

Then translate that into annual expenses, broken into three categories:

This exercise almost always produces a number that’s different from the spending figure people originally plug into the 25x formula, and the gap tends to be illuminating.

Step Two: Model Your Income Sources

On the other side of the equation is a complete picture of your financial resources, not just your primary investment portfolio, but every account, income stream, and asset that will contribute to funding the life above.

Start with the accounts themselves: taxable brokerage accounts, traditional and Roth IRAs, 401(k)s, and any other investment vehicles. Then add other income sources, including:

• Social Security, if applicable, with the caveat that timing changes the number substantially — claiming at 62 versus delaying to 70 can mean a meaningfully different monthly benefit for the rest of your life
• Deferred compensation distributions, if you have an NQDC balance, which arrive on a schedule set years earlier and taxed as ordinary income upon receipt
• Pension benefits, for the dwindling number of people who have them
• Rental income from investment real estate
• Part-time consulting or board work, if that’s part of your post-career plan
• Business sale proceeds, if a liquidity event is part of the picture and hasn’t happened yet

Each source has different timing, tax treatment, and reliability, which is why inventorying them and modeling when each becomes available is important. A pension that starts at 65 and Social Security delayed to 70 don’t show up in the same year, and a financial plan that doesn’t sequence them properly can create either an income gap or an unnecessary tax spike.

Here’s a hypothetical example of this exercise:

Consider a couple, both 61, planning to step back from full-time work at 64. Through Step One, they’ve identified $230,000 in annual essential and discretionary spending, plus a one-time $150,000 gift to help their daughter buy a home. In present value terms, accounting for a 30-year horizon and moderate inflation, their dream life costs roughly $7 million.

Their inventory of resources:

After accounting for rental income, consulting income, and eventual Social Security, the portfolio doesn’t need to fund the full $230,000 every year; it needs to cover a much smaller gap in the early innings. Run against a reasonable withdrawal rate, their $5.8 million portfolio comfortably covers what’s left.

Step Three: Stress-Test It

A satiation number that only works in average conditions is merely an optimistic projection. Before you trust it, run it against scenarios that are uncomfortable but possible:

Inflation running hotter than expected. Model your plan at 3.5% average inflation over 30 years instead of the standard 2.5–3% assumption. Healthcare costs in particular have historically outpaced general inflation, which compounds the effect on one of your largest essential categories.

A market downturn in the first few years. Sequence-of-returns risk means a bad market early in retirement does more damage than the same bad year a decade in, because you’re drawing down a smaller portfolio while it’s already declining. Model what happens if the first two years of retirement look like 2008 or 2022 (a 20–30% decline) before any recovery happens.

A long-term care event. The median cost of a private room in a nursing facility now exceeds $135,000 per year. Even a two- or three-year care need for one spouse can dent a plan that wasn’t built with this in mind.

A material change in family obligations. An adult child who needs help, an aging parent who needs support, an unexpected health event in the family. These don’t show up in a standard projection, but they show up in real life with some regularity.

If your number holds across these scenarios without requiring a drastically different lifestyle, you’ve found a number you can trust. If it doesn’t hold — if a bad sequence of returns or a long-term care event forces major sacrifices — the number isn’t there yet, or your spending assumptions in Step One need to be revisited with more discipline.

The Lifestyle Inflation Trap: Why the Goalposts Keep Moving

Every time your wealth grows, your “enough” number grows with it. You find yourself thinking, “I’ll be ready to retire once I hit $5 million,” but by the time you reach $5 million, your lifestyle has scaled up so that you now need $6 million to maintain the “new normal.” The goalposts have been dragged further down the field.

Let’s be honest: you didn’t work this hard to live a life of austerity. There is nothing wrong with upgrading your world as your income rises. But there is a massive difference between enjoying your success and anchoring your financial freedom to a standard of living that scales exponentially with your income.

This is lifestyle inflation. And if you don’t account for it, it will turn your satiation number into a mirage. 

At Five Oceans, we start every retirement conversation with the dream life, not the portfolio. That’s the foundation of what we call Life Strategy — defining what you actually want before we ever touch an allocation. What does your day-to-day look like? What does this wealth make possible that you haven’t yet given yourself permission to pursue? What does “enough” mean as both a number and as a lifestyle?

Those questions have a way of moving the goalposts back to where they belong.

If you’re ready to find your number, I welcome the conversation.

Talk with me.