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There is a meaningful difference between being a good investor and having a good retirement income plan.
Many people who arrive at retirement have done everything right during the accumulation phase. They saved consistently. They invested in low-cost index funds. They did not panic during market downturns. They built a sizable portfolio to enter into their “work optional” phase of life.
And then they retire and discover that the skills that grew their wealth are not the same skills required to distribute it wisely.
The transition from accumulation to distribution is the most complex financial shift most people will ever make. The risks change. The decisions that seemed obvious during the saving years can work against you during the spending years.
Here are five blind spots we see most often among experienced, capable investors who are managing their own retirement planning.
During your working years, market volatility is often an opportunity. When the market drops 20%, you are buying shares at a discount and giving them time to recover. A bad year in the market when you’re 40 is very different from a bad year in the market when you’re 65.
When you are withdrawing from your portfolio to fund living expenses, a significant market decline in the early years of retirement can permanently impair your long-term financial security, not because the market does not recover, but because you are forced to sell shares at depressed prices to fund your spending while the recovery is still happening. The shares you sold at a loss are not there to participate in the rebound.
This is sequence of returns risk.
Consider two retirees with identical portfolios and identical average returns over 20 years. One experiences strong returns early and poor returns late. The other experiences the same returns in reverse — poor early, strong late. The first retiree ends up significantly wealthier, purely because the sequence was more favorable.
The practical response is to hold one to two years of planned withdrawals in cash or short-term fixed income, creating a buffer that allows you to avoid selling stocks during a downturn. You draw from the buffer during down markets and replenish it when markets recover. At Arcadia, we prefer to use US Treasury Bills/Notes and money market funds for the short-term buffer fund.
Many DIY investors understand this concept intellectually but never implement a formal buffer fund. They manage a single portfolio and make ad hoc decisions about what to sell each month. That approach works adequately in good markets and poorly in bad ones.
In retirement, the tax questions multiply.
You have multiple account types — Traditional IRA, Roth IRA, taxable brokerage — each taxed differently. You have Social Security, which may be 0%, 50%, or 85% taxable depending on your total income. You have Required Minimum Distributions that begin at age 73 and push income up whether you need the money or not. You have Medicare premiums that are income-sensitive through IRMAA surcharges, creating cliff effects where a single dollar of additional income can cost thousands per year in higher premiums for two years forward.
The order in which you draw from your accounts has a direct impact on your lifetime tax bill. Most DIY investors draw from pre-tax accounts first because that is where the money is. This is often the wrong sequence.
A more sophisticated approach typically involves:
This requires continuous coordination across multiple accounts, multiple income sources, and a forward-looking view of tax brackets. The gap between an optimized withdrawal sequence and an unoptimized one is often tens of thousands of dollars in lifetime tax savings.
The most common assumption in DIY retirement modeling is that spending will increase steadily with inflation, year after year, for 30 years.
That is not how retirement typically unfolds.
Research by David Blanchett, published in the Journal of Financial Planning, documented what he called the retirement spending smile. Spending follows a curve, not a line.
In the early years, the Go-Go years, spending is highest. Travel, experiences, activities, time with family, pursuing the things deferred during a career. Then, gradually, spending declines as energy and mobility naturally slow. Then, in the final chapter, spending rises again. This time driven by healthcare costs, long-term care, and sometimes large gifts to family.
The practical consequence of modeling a flat line is that retirees often under-spend in the most valuable years of retirement and then discover they have more money than they need at a point in life when they can no longer use it the same way.
We have worked with clients who reached their mid-80s with a larger portfolio than they had at retirement, having spent 20 years living more conservatively than their finances required, waiting for certainty about a future that never felt fully certain. The window for the experiences they had planned had largely passed.
A realistic retirement income plan models spending in phases, not as a single inflation-adjusted line. It builds in higher discretionary spending in the early years, and explicitly plans for the healthcare cost spike that often comes later.
The best-performing asset in your portfolio last year feels like the right thing to own more of this year.
This instinct is nearly universal. It is also nearly always wrong at the extremes.
Recency bias leads investors to overweight whatever has performed well recently and underweight whatever has underperformed. Over time, this produces portfolios that are concentrated in yesterday's winners at precisely the moment when mean reversion is most likely.
Individual stocks that became top-10 by market cap have historically underperformed the broader market in the decade following their peak. The companies that seemed like permanent winners (i.e., AT&T, Exxon, GE, Citigroup) eventually gave back significant ground in subsequent years
The specific version of this we see most often among pre-retirees today is technology and AI concentration. The Magnificent Seven stocks drove the majority of S&P 500 returns in 2023 and 2024. Many investors who experienced this are now more concentrated in large-cap technology than they realize, and more concentrated than a well-constructed retirement portfolio should be.
The discipline required to trim winners (to sell something that has performed extraordinarily well) and redeploy the proceeds into something that has lagged is genuinely difficult to sustain emotionally without a systematic framework. This is one area where a structured investment policy statement, or working with an advisor who applies a disciplined rebalancing process, materially improves outcomes over self-directed investing.
The 4% rule is one of the most useful concepts in retirement planning. It is also one of the most misapplied.
The concept originates from research by William Bengen published in 1994. He found that a 4% initial withdrawal rate, increased annually by inflation, historically sustained portfolios over 30-year retirements. He actually calculated 4.15% and rounded down for simplicity. He later described this as the SAFEMAX — the safe maximum for the worst-case historical scenario, specifically someone who retired in October 1968 and faced a decade of stagflation. For the average retiree across historical periods, the sustainable rate was meaningfully higher.
Bengen has since updated his work. In his new 2025 book, he revised his sustainable withdrawal rate to approximately 4.7% for a more diversified portfolio that includes small-cap and international stocks. He has also noted that the original research was intended as a floor for worst-case planning, not a universal target and that rigid adherence to 4% often produces what he calls the Spend-Down Paradox: retirees live so conservatively in their best years that they end up leaving enormous unspent wealth to heirs.
The deeper problem with treating the 4% rule as a plan is that it is static. It sets a withdrawal amount at the start of retirement and mechanically adjusts it for inflation regardless of what markets actually do. In a strong market environment, the static rule leaves significant spending capacity unused. In a poor market environment, it can draw portfolios down faster than is sustainable.
A more robust approach replaces a fixed rule with a dynamic withdrawal strategy, one that increases spending when markets perform well and reduces spending modestly when they do not. The guardrail approach, which we covered in a recent article applies this logic: retirement income should respond to your actual circumstances, not a calculation made at age 65 that runs on autopilot for 30 years.
To be clear: competent DIY investors get many things right. They tend to keep costs low. They avoid chasing individual stocks. They maintain broadly diversified portfolios. They do not panic during market downturns. These are genuine advantages.
The gaps appear not in investment selection but in coordination.
Retirement income planning requires simultaneously managing investment allocation, tax sequencing, Social Security timing, Medicare costs, healthcare planning, estate coordination, and spending strategy — across multiple accounts, multiple income sources, and a 25-to-30-year time horizon during which tax laws will change, family circumstances will evolve, and the plan will need ongoing recalibration.
The cost of getting it wrong, in taxes overpaid, in experiences missed during the Go-Go years, in sequence-of-returns damage absorbed without a buffer tends to be significantly higher than most people estimate when they are deciding whether to hire an advisor.
The relevant question is not whether you are capable of managing your own retirement. Many people are. The relevant question is whether the coordination value of having an integrated plan managed by someone whose only job is to optimize your outcomes exceeds the cost of that service.
Disclosure: This article is for informational purposes only and does not constitute personalized financial, tax, or investment advice. All investing involves risk. Please consult a qualified financial advisor for guidance specific to your situation. Arcadia Private Wealth LLC is a Registered Investment Advisor.
Grant Webster, CFP®, TPCP®
Founder, Wealth Advisor