The most common retirement planning mistakes rarely start with a bad investment. Ask most people what could go wrong in retirement, and they’ll picture a market crash or a bad stock pick — but in practice, the more common failure point is simpler and less dramatic: reaching retirement with no written plan for how savings will actually become income. Accumulation — the decades spent working and saving — and distribution — the years spent drawing that money down — are genuinely different phases of financial life, and treating them the same way is where most retirement planning mistakes start.
Why Retirement Requires a Different Strategy
During your working years, the goal is straightforward: earn, save, and let the portfolio grow. There’s a paycheck arriving regularly, and market swings mostly just change how fast the balance climbs. Retirement removes that paycheck entirely. Now the portfolio itself has to produce reliable income, on a schedule, while still lasting for a retirement that could run 20 or 30 years.
Think of it the way you’d think about switching sports mid-season. The skills that make someone a strong basketball player — quick cuts, a good jump shot, reading a fast-moving court — don’t transfer to baseball, even though both are competitive team sports played with a ball. Retirement is a similar switch: the tools that worked well for building the portfolio, mostly a single-minded focus on long-term growth, aren’t the same tools that reliably turn it into income on a predictable schedule.
Without recognizing that shift, it’s easy to keep managing money the way you did at 45, and to run into problems you simply didn’t have during your working years, when a bad market year just meant a slower year of growth rather than a real threat to your spending.
This is also why so much retirement advice aimed at accumulation falls flat once someone actually retires. “Maximize long-term growth” is a fine rule when there’s no distribution schedule to protect. It stops being sufficient the moment a market downturn coincides with the years you’re actually withdrawing money to live on.
Financial planners sometimes call the years immediately before and after retirement the “retirement risk zone” — roughly the five years leading up to retirement and the first five to ten years into it. A downturn during accumulation, decades before you need the money, is mostly just a paper loss that time and continued contributions can erase.
The same downturn hitting during the risk zone is a different problem entirely, because you’re now selling shares to cover living expenses at the same time those shares are worth less, which permanently reduces how much of the portfolio is left to recover when the market eventually turns around. That’s the core reason a plan built purely around long-term average returns misses something a real income plan has to account for directly.
The Most Common Retirement Planning Mistakes Retirees Make Without a Plan
A few patterns show up again and again in retirees who haven’t mapped out a real income strategy, and each one is avoidable once you can see it coming.
Overspending and Underspending
Some retirees spend too freely simply because there’s no framework telling them what’s sustainable — no number to check spending against, so there’s no signal that anything is wrong until the portfolio balance itself starts telling a worrying story. Just as often, the opposite happens: retirees who are so nervous about running out of money that they underspend for years, skipping trips and experiences they could actually afford, out of fear rather than fact. Both are symptoms of the same underlying issue — no plan that shows, in real terms, what a sustainable withdrawal actually looks like given this specific portfolio, this specific spending pattern, and this specific set of other income sources.
Tax Inefficiency
Without a strategy, it’s easy to pull from accounts in the wrong order or take more than necessary from taxable IRAs in a given year. This is one of the more expensive retirement planning mistakes because the cost isn’t always obvious in the moment — it shows up later, in a tax bill or a premium increase that seems to arrive out of nowhere.
How to Avoid IRMAA When You Don’t Have a Plan
One concrete, recurring cost of tax inefficiency is triggering IRMAA — the Income-Related Monthly Adjustment Amount, a surcharge Medicare adds to Part B and Part D premiums for retirees whose income crosses certain thresholds. The standard 2026 Part B premium is $202.90 a month, but retirees above the income thresholds pay more, and how much more depends directly on income reported roughly two years prior (see Medicare’s own cost breakdown for the current premium tiers). Because IRMAA looks back at a prior tax year, the way to avoid it isn’t a decision you make in the moment you get the bill — it’s a decision made one or two years earlier, when the account withdrawal actually happened.
The practical way to avoid IRMAA is straightforward, even if executing it takes real planning: know your MAGI (modified adjusted gross income) threshold before you cross it, and decide account withdrawals for the year with that threshold in mind rather than discovering it after the fact. Retirees also frequently miss lower-income years — often early in retirement, before Social Security starts — that would have been a good window for a Roth conversion or for claiming healthcare tax credits, precisely because nobody was tracking income levels closely enough to notice the opportunity while it was open.
Required minimum distributions add another layer to this. Once you reach the age the IRS requires withdrawals from tax-deferred accounts, those distributions count as income whether or not you actually need the money that year, which can push MAGI over an IRMAA threshold on its own. Retirees who did proactive Roth conversions in the years before RMDs began often end up with smaller required distributions and more control over their own tax bracket later — one more reason the years immediately after retiring, before RMDs start, tend to be some of the highest-leverage tax-planning years available. (See how to reduce your RMD for the mechanics of that specific decision.)
Sequence of Returns Risk
A generic 60/40 portfolio with no real spending strategy behind it can be a costly mistake heading into retirement. The order in which you experience market returns matters far more once you’re withdrawing money than it did while you were still contributing to the account — a downturn in the first few years of retirement can do lasting damage that the same downturn, experienced later or during accumulation, would not.
Two retirees can earn the identical average annual return over a 25-year retirement and end up in completely different places, purely based on which years the bad returns landed in. The retiree who hits a market decline in year one or two, while still withdrawing the same dollar amount to cover living expenses, locks in losses at the worst possible time. The retiree who hits the identical decline in year twenty, after two decades of growth built up a much larger cushion, barely notices it by comparison. Average returns don’t capture this difference at all — only the sequence does.
This is a large enough topic that it deserves its own deep dive; the short version relevant here is that a real income plan has to account for the order of returns, not just their long-term average, and a bucket-based investment approach (below) is one of the most direct ways to do that.
What a Retirement Income Plan Should Actually Include
A retirement plan isn’t a single number — it’s a map of everything that changes as you move through retirement.
Income timing. Income rarely arrives evenly. If Social Security or a pension is delayed, the early years of retirement may need to come entirely from portfolio withdrawals, which is a very different situation than the later years once those other income sources start. A retirement income plan should map that out year by year rather than relying on a single average withdrawal rate.
Taxes. Tax exposure shifts substantially throughout retirement depending on which accounts you’re drawing from, your income sources in a given year, your marital status, and ongoing changes to tax law. Planning for that shift in advance — rather than reacting to it each April — is part of what separates a real income plan from a rough estimate.
Healthcare. Coverage changes are a real cost, not a footnote. Before 65, many retirees rely on healthcare.gov for coverage; after 65, most transition to Medicare, where premiums, deductibles, and — as covered above — IRMAA surcharges all depend on income. Each stage comes with different costs and different planning considerations, and both need to be built into the plan rather than addressed as they come up.
The Retirement Bucket Strategy
Rather than one blended portfolio, a retirement bucket strategy separates money by when you’ll actually need it. A typical structure: cash to cover roughly the next 12 months of spending, bonds and CDs to cover the next two to ten years, and an equity portfolio to keep growing over the long term as the furthest-out bucket. The tradeoff is real — holding more in cash and short-term bonds means giving up some long-term growth potential compared to a portfolio invested entirely for growth.
But it’s what allows a temporary market downturn to be an inconvenience rather than a crisis. If a downturn hits, you’re spending from the cash and short-term bond buckets while the equity bucket is left alone to recover, which is precisely the mechanism that manages sequence-of-returns risk in practice rather than just in theory.
The strategy isn’t a one-time setup — it requires periodic refilling. In a normal or up market, the plan typically calls for trimming some gains from the equity bucket each year to refill the cash and short-term bond buckets, keeping roughly the same number of years of spending on hand in the safer tiers.
In a down market, that refilling pauses, and spending draws down the cash and bond buckets instead, buying the equity bucket time to recover before it has to be touched again. Retirees who set up the buckets once and never revisit the refilling step tend to end up drifting back toward whatever their original blended allocation was, which quietly undoes the entire point of separating the buckets in the first place.
Don’t Forget Estate Planning
Estate planning isn’t something you set once and forget. Many people establish trusts while raising a family specifically to protect minor children, and those documents often need updating as kids grow into self-sufficient adults — age restrictions written in years ago may no longer make sense once the people they were written for are adults with their own careers and families. Charitable goals also tend to shift in retirement as priorities change and as more time becomes available to actually act on them.
Two of the most commonly neglected pieces aren’t the will or the trust itself — they’re the supporting documents and the paperwork that actually makes those documents work. A durable power of attorney signed years ago can be refused by a bank or brokerage that requires its own specific, more recent authorization form, which is a genuinely bad time to discover the gap. Beneficiary designations on retirement accounts, life insurance, and transfer-on-death accounts also override what a will or trust says entirely — an outdated beneficiary form from a previous marriage or an account opened decades ago routinely sends money somewhere the account owner never actually intended, simply because nobody thought to check it again.
A retirement plan that maps income, taxes, and healthcare but leaves estate planning conversations on autopilot is still an incomplete plan — and revisiting it periodically, rather than only after a major life event forces the issue, is what keeps it aligned with what you actually want.
You don’t win retirement by running up the score — you win by making sure your money lasts as long as you do. Of all the retirement planning mistakes covered here, the costliest is the simplest to fix: entering retirement without a comprehensive plan for turning what you’ve saved into the income you’ll actually live on.
