The Retirement Rule That Makes Planning Much Easier
One of the biggest mistakes in retirement planning is assuming you will spend the same amount every year for the rest of your life. That idea may feel tidy, but it is usually not how retirement actually works. Real retirement is dynamic. People do not live the same way at 67 that they do at 82. Their priorities shift, their activity changes, and their spending often follows a pattern that is much more predictable than many generic planning rules suggest. That is why a phased retirement framework can be so useful. It gives people a more realistic way to think about what retirement will actually cost instead of relying on one flat number stretched across two or three decades.
A simple way to understand that pattern is through what might be called the 80-70-60 rule. In the early years of retirement, often the first 10 to 15 years, spending tends to be highest. These are the so-called go-go years, when people are more active, more likely to travel, more likely to pursue hobbies, and more willing to spend on experiences they delayed while working. In that phase, a reasonable planning target may be around 80% of pre-retirement income. That does not mean everyone will spend exactly 80%, but it offers a useful benchmark because some work-related costs disappear while lifestyle spending often rises.
Then comes the next stage, often called the slow-go years. Travel usually tapers off. Big-ticket discretionary spending becomes less frequent. Daily life often becomes more settled. In this phase, spending commonly declines to around 70% of pre-retirement income. People are still living comfortably, but they are often doing less of the more expensive activity that defined the first chapter of retirement. The point is not deprivation. It is simply that retirement evolves. What feels exciting and necessary at 66 may feel less relevant at 76.
Later comes the no-go stage, when spending often declines further to around 60% of pre-retirement income. At that point, priorities usually shift even more toward comfort, routine, and healthcare rather than travel, entertainment, or large purchases. Many retirees find they are not spending as much because they simply are not doing as much. There may be a modest rise in medical or care-related expenses later in life, but even with that bump, total spending often remains below the levels seen in the earlier retirement years. That is one reason the common fear of endlessly rising retirement costs is often overstated. For many households, the most expensive retirement years are actually the first ones, not the last.
This framework matters because it changes how much portfolio income you may truly need. If spending declines over time, then your withdrawals from savings may also decline over time, especially once Social Security is layered into the plan. That is a major difference from the traditional assumption that you need to generate the same inflation-adjusted income every year forever. In reality, Social Security can cover a larger share of spending as retirement progresses, not because benefits explode higher, but because the spending target itself often comes down.
Take a household earning around $78,000 before retirement. Under this framework, their early retirement spending might be roughly $62,400 per year, or 80% of pre-retirement income. Mid-retirement, that might fall to about $54,600. Later in retirement, it could decline to around $46,800. If a couple is receiving around $42,000 per year from Social Security, that benefit may cover a large share of the spending target from the start and an even larger share as time goes on. That means the investment portfolio may only need to cover a relatively modest gap, and that gap can shrink over time.
That is where this kind of planning becomes much more practical than generic rules of thumb. Instead of asking, “How big does my portfolio need to be to replace my full income forever?” you can ask a much more useful question: “What does my portfolio need to cover after Social Security, and how does that need change over time?” That often leads to a lower and more realistic savings target than people fear, especially for households with meaningful guaranteed income. In the example provided, the math may suggest a portfolio need of around $300,000, but adding a safety margin for market risk, longevity, and unexpected costs pushes a more practical target closer to $400,000 to $450,000.
That safety margin is important because retirement planning is never only about averages. Life does not arrive in neat, predictable stages. Healthcare costs can vary. Longevity can stretch well beyond expectations. Markets can disappoint early in retirement. A spouse can die, changing both expenses and income. So while the mathematical estimate may point to one number, a buffer often makes the plan sturdier in real life. A retirement strategy should not just work in a perfect spreadsheet. It should hold up reasonably well when life gets messy.
The difference between married and single retirement planning also becomes much clearer through this framework. Couples often benefit from having two Social Security checks, which can reduce the burden on the portfolio. Singles, by contrast, may rely much more heavily on savings because they only have one Social Security benefit. That changes the drawdown picture substantially. A single retiree may need a significantly larger portfolio relative to income because the guaranteed income floor is lower and there is less ability to spread costs across two people. In the example outlined, a single retiree could need a portfolio more in the range of $680,000 to $700,000 mathematically, with a more conservative target of roughly $750,000 to $800,000 once a prudent cushion is added.
That is one reason broad retirement rules can be so misleading. A number that looks sufficient for a married couple may be far too low for a single person. Likewise, a target that works for someone with strong Social Security income may be very different from what someone else needs if their benefit is smaller. Personalized planning matters because retirement is not only about total savings. It is about how those savings interact with guaranteed income, health, lifestyle, and support systems.
Another benefit of this framework is psychological. Many people approaching retirement feel overwhelmed because the planning problem seems too large. They assume they need to solve for 25 or 30 years of identical spending, inflation, and uncertainty all at once. Breaking retirement into phases makes the problem more manageable. It reflects what people actually experience. It also allows for more honest conversations about what matters at different points in life. The travel-heavy years are not likely to last forever. Neither are the lower-spending years. Planning in stages better matches reality.
This does not mean everyone should blindly apply 80%, 70%, and 60% to their own life without thinking. Some households will spend more. Some will spend less. Some will have chronic healthcare needs that push late-life costs higher. Others may downsize, relocate, or receive family support that changes the picture dramatically. The framework is not meant to eliminate personalization. It is meant to replace one unrealistic assumption with a more useful starting point.
The larger lesson is that retirement planning gets easier when it becomes more realistic. Spending usually does not remain flat forever. Social Security matters more than many people think. A portfolio does not have to do all the work alone. And building in a buffer can make the difference between a fragile plan and a confident one. Too often, people either underestimate retirement because they fail to think through later-life risks, or they overestimate what they need because they assume peak spending lasts forever. This phased approach helps avoid both mistakes.
The retirement rule that makes planning easier is not magic. It is simply a reminder that life changes, and your spending changes with it. When you plan for retirement the way people actually live it, the numbers start to make more sense. And once the numbers make more sense, retirement itself often feels a lot less intimidating.
All writings are for educational and entertainment purposes only and does not provide investment or financial advice of any kind.
