Why Retirement Planning Goes Wrong
Building a retirement plan is one of the most important financial undertakings of your life and also one where small missteps can compound over time. The good news is that most retirement planning mistakes are preventable. They tend to stem from common misconceptions, outdated assumptions, or simply not asking the right questions early enough.
Here are six of the most consequential retirement mistakes. What they look like, why they happen, and how to avoid them.
Mistake 1: Not Writing Your Plan Down
Why does a written retirement plan matter?
It’s common for people approaching retirement to have a general sense of their plan without ever committing it to paper. They may have a rough idea of when they want to retire, what they expect to spend, and what they assume Social Security will cover. But without a written plan, these assumptions are rarely stress-tested and they’re often wrong.
One of the most significant misunderstandings involves Social Security. According to the Social Security Administration, most financial advisors recommend having 80% of pre-retirement income to live comfortably in retirement. Social Security, by design, replaces only around 40% of pre-retirement income for an average earner, meaning the gap between what Social Security provides and what you actually need must come from personal savings, investments, and other income sources.
A written plan closes that gap on paper before it becomes a problem in practice. It should account for projected expenses, income sources, withdrawal strategies, healthcare costs, and contingency scenarios. Equally important: revisit and update it regularly. A plan written at 50 may need major revisions by 60.
Mistake 2: Counting on Unrealistic Investment Returns
How should you project investment growth in a retirement plan?
It’s human nature to anchor expectations to recent bull market performance. But retirement planning built on optimistic return assumptions is fragile and market history is humbling.
The more durable approach is to plan conservatively. Rather than modeling returns at peak expectations, use a moderate baseline and treat stronger performance as a buffer rather than a baseline. Your plan should be able to survive a difficult sequence of returns in the years immediately before and after retirement, typically a period where losses are hardest to recover from.
One practical strategy: maintain 12–24 months of living expenses in cash or cash equivalents within your overall portfolio. This liquidity reserve allows you to cover expenses during a market downturn without being forced to sell investments at a loss. According to Ned Davis Research, the average bear market has lasted approximately 289 days (about 9.6 months), and over the last 95 years of market history, stocks have been in positive territory 78% of the time. A cash buffer gives you the ability to wait out the other 22%.
Mistake 3: Taking on Too Much Investment Risk
How do you know if your portfolio is too risky for retirement?
Many retirees and pre-retirees believe their portfolios are more conservative than they actually are. They may have made aggressive allocation decisions years ago and never revisited them, or they may not fully understand the risk profile of the funds they hold.
The years immediately surrounding retirement, the five years before and after, are sometimes called the “retirement red zone.” A severe market decline during this window can permanently impair your retirement income, because you have less time to recover and may be drawing down assets simultaneously.
The antidote is to take a measured, intentional risk aligned with your goals and timeline. A financial advisor can stress-test your portfolio against historical downturns, assess your actual risk exposure versus your perceived exposure, and help build a strategy that pursues growth while protecting the foundation you’ve spent a career building.
Mistake 4: Being Too Frugal
Is it possible to be too cautious with retirement savings?
Yes, and it’s more common than people expect. After decades of disciplined saving and resisting the urge to spend, many retirees find it psychologically difficult to shift into spending mode. The result is an overly restrictive approach to retirement income that undermines the quality of life those savings were meant to provide.
One useful framework is to segment your retirement assets into distinct pools by purpose:
- Emergency / Safety Fund: Liquid assets you can access at any time without market risk
- Income Fund: Reliable income streams, such as bonds, annuities, or dividend-producing assets, designed to cover regular living expenses
- Growth Fund: Longer-horizon investments that can absorb more volatility and help your portfolio keep pace with inflation over time
This structure provides both security and permission. When you know your monthly expenses are covered by your income fund and your emergency needs are handled separately, it becomes easier to enjoy the growth fund’s resources without anxiety and to actually use the retirement you worked so hard to build.
Mistake 5: Giving Too Much to Your Children Too Soon
How do financial gifts to children affect retirement security?
The impulse to help adult children, paying off student debt, co-signing a mortgage, providing a down payment, is noble. But it can become a serious threat to retirement security if done without a clear-eyed view of the financial impact.
The critical principle: you cannot effectively provide for others in retirement if you have not first secured your own financial foundation. There is a reason airline safety instructions tell you to put on your own oxygen mask before helping others.
This doesn’t mean you can’t be generous with your children. It means that generosity should be intentional, planned, and budgeted and not reactive. Before making any financial commitment to an adult child, review your withdrawal projections with your financial advisor to understand the long-term impact on your own retirement income.
Mistake 6: Being a Passive Participant in Your Own Plan
How involved should you be in your retirement planning?
Your financial advisor’s job is to build and manage your plan with expertise. But expertise is not a substitute for engagement. The most successful retirement outcomes come from clients who understand their strategy, ask questions when something is unclear, and stay actively informed as circumstances change.
Markets shift. Tax laws change. Your own health, family situation, and goals evolve. A plan that was perfectly calibrated five years ago may need meaningful revision today and catching that early requires an ongoing dialogue between you and your advisor.
At a minimum, this means regular check-ins, reviewing statements, and speaking up when something in your financial life changes. Your advisor may have information and context you don’t. But you have information about your life that your advisor doesn’t. The best retirement plans are built on that two-way exchange.
Frequently Asked Questions About Retirement Planning Mistakes
How much of my pre-retirement income will I need in retirement? According to the Social Security Administration, most financial advisors recommend planning for approximately 80% of pre-retirement income to maintain a comfortable lifestyle. Social Security replaces roughly 40% for average earners, meaning the remaining 40% must come from personal savings and other sources.
How much cash should I keep in retirement? A common recommendation is to hold 12–24 months of living expenses in cash or cash equivalents. This provides a buffer during market downturns and reduces the risk of selling investments at a loss to cover near-term expenses.
When should I start working with a financial advisor on retirement planning? The earlier the better, but it’s never too late to start. Ideally, a comprehensive retirement plan is in place at least 10 years before your target retirement date, giving time to course-correct if needed.
What is the “retirement red zone” and why does it matter? The retirement red zone refers to the five years before and after retirement, the period when a major market downturn can do the most lasting damage, because you have less time to recover and may be drawing down assets simultaneously. Portfolio risk management is especially critical during this window.
How do I know if I’m being too frugal in retirement? If you’re consistently spending less than your withdrawal plan allows, and you’re restricting activities or expenses you had planned to enjoy, it may be worth revisiting your plan with an advisor to confirm your current spending level is sustainable and to give yourself permission to use the assets you’ve saved.
The Bottom Line
Retirement planning mistakes rarely happen all at once. They tend to accumulate quietly, in assumptions that go unexamined and plans that go unreviewed. The six mistakes above are common precisely because they’re easy to rationalize: “I’ll write it down later,” “the market will recover,” “I just want to help my kids.”
The most retirement-ready people are those who plan with clear eyes, revisit their assumptions regularly, and stay engaged with their financial strategy at every stage.
A financial advisor at Barnum Financial can help you identify where your current plan may be exposed, correct course before small mistakes become large ones, and build a retirement strategy designed to last as long as you need it to.
