Most people spend decades learning how to invest for retirement. Very few adjust their thinking once they actually retire.
That distinction matters more than most realize.
While you’re still working and contributing to your 401(k) or IRA, market volatility can actually work in your favor. Once you retire and begin withdrawing money, that same volatility can work against you — sometimes in powerful and permanent ways.
There are two forces in particular that change the math.
How Dollar Cost Averaging Helps You While You’re Still Saving
Dollar Cost Averaging is simple. You invest a fixed amount of money on a regular schedule — every paycheck or every month.
- When the market is up, your contribution buys fewer shares.
- When the market is down, that same contribution buys more shares.
Over time, this process can lower your average cost per share. Market declines, while uncomfortable, often allow you to accumulate more shares for the same amount of money. This is one reason continuing to contribute during downturns has historically been a smart long-term approach during the accumulation years.
In short: while you’re still saving, volatility can help you.
Force #1: Reverse Dollar Cost Averaging
Once you retire and start taking money out, the process flips.
When the market drops and you need to withdraw funds for living expenses, you’re forced to sell more shares to generate the same amount of income. Those shares are sold at lower prices and are gone for good. They no longer participate in any future recovery.
This is the opposite of what happened while you were saving. Instead of buying more shares when prices are low, you’re selling more shares when prices are low.
That’s Reverse Dollar Cost Averaging.
Here’s a simple example. Two retirees both start with $1 million and withdraw $50,000 a year. Both end up with the exact same average return over 20 years. The only difference is the sequence of those returns.
One experiences strong returns early and weaker returns later. The other experiences weak returns early and stronger returns later.
Even though their average returns are identical, the person who faced poor returns early in retirement often ends up with significantly less money — and in many cases runs out years earlier.
Same average return. Very different outcome. The order of the returns made the difference.
Force #2: The 50/100 Rule
The second force is pure mathematics.
If your portfolio drops 50%, many people assume they only need a 50% gain to break even. That’s not how the math works.
Start with $100,000. A 50% loss leaves you with $50,000. To get back to $100,000, that $50,000 must double. You need a 100% gain — not a 50% gain.
This is the 50/100 Rule:
- A 50% loss requires a 100% recovery just to break even.
- A 30% loss requires roughly a 43% gain to recover.
- A 20% loss still needs a 25% gain to get back to even.
Large losses hurt more than most people realize — especially when you’re also withdrawing money at the same time.
Why the Early Years of Retirement Matter Most
When you combine Reverse Dollar Cost Averaging with the 50/100 Rule, the first three to seven years of retirement become critical. A significant market drop early on doesn’t just feel painful in the moment. It can create a hole that becomes very difficult to climb out of.
This is why simply chasing the highest possible average return is often the wrong goal once you retire. Reducing the size of the big down years can matter more than squeezing out a little extra return in the good years.
How to Protect Yourself
Here are six practical steps:
- Separate Live On money from Leave On money The dollars you’ll need to spend should be treated differently than the dollars you intend to leave to your heirs.
- Use a bucket or layered approach Keep the first few years of expenses in cash or very conservative investments so you’re not forced to sell stocks during a downturn.
- Increase guaranteed income Social Security timing, pensions, and in some cases annuity income can cover more of your essential expenses, reducing the need to sell investments in a down market.
- Add more stable income sources Bond interest and dividend income are not guaranteed, but they can provide steadier cash flow than relying solely on selling shares.
- Stress-test your plan Don’t just look at average returns. Model what happens if the market drops 20–30% in the early years of retirement while you’re withdrawing money.
- Be flexible with early withdrawal rates Having some spending flexibility in the first few years can make a meaningful long-term difference.
The goal is not to eliminate all risk. The goal is to make sure a period of poor returns early in retirement does not permanently damage your plan.
If you’re within five years of retirement or recently retired, understanding Reverse Dollar Cost Averaging and the 50/100 Rule is one of the most important steps you can take.
You can listen to the full episode of this discussion on the A Smarter Way to Retire podcast or watch it on my YouTube channel.
I also still offer a complimentary Smart Retirement Model while openings are available, and the Smart Tax Shield Legacy Playbook is available for free on my website.
→ Website: LeonardiFamilyWealthcare.com → YouTube: @LeonardiFamilyWealthcare → Podcast: Available on Apple Podcasts & Spotify