Retired man recalculating his spendable money

The 5 Retirement Mistakes That Are Catching People Off Guard in 2026

May 03, 2026•11 min read

New rules, rising costs, and a retirement income gap are creating expensive surprises. Here's what to watch for, and exactly what to do instead.

Category: Retirement PlanningTags: retirement mistakes 2026, retirement planning mistakes to avoid, Medicare IRMAA 2026, retirement tax mistakes, sequence of returns risk, retirement income plan, healthcare costs before MedicareSuggested Read Time: 13 minPublication Date: April 28, 2026Author: The Team at Turnkey Retirement Survival Pro

Retirement planning has never been simple. But 2026 has introduced a specific set of new rules, rising costs, and economic uncertainties that are catching even well-prepared retirees off guard, sometimes to the tune of thousands of dollars a year.

We've been watching these patterns closely in our community, and we want to make sure you see them coming before they arrive. The five mistakes we're covering here are not hypothetical. They are happening right now, to real people who did many things right but missed a few critical details. The good news is that every one of them is preventable, if you know what to look for.

Mistake 1: Not Stress-Testing Your Retirement Plan

Most people build their retirement plan around a single set of assumptions: a certain rate of return, a certain inflation rate, a certain spending level, a certain lifespan. They run the numbers, they look good, and they retire with confidence.

The problem is that retirement doesn't happen in a spreadsheet. It happens in the real world, where markets drop, inflation spikes, health costs surge, and lifespans exceed expectations. A plan that looks solid under average conditions can unravel quickly when conditions are anything but average.

Sequence of returns risk is the most underappreciated danger here. This is the risk that a significant market downturn in the early years of your retirement, before your portfolio has had time to recover, can permanently damage your long-term financial security in a way that the same downturn in year 15 simply would not. A 30% market decline in year two of retirement, combined with ongoing withdrawals, can reduce a portfolio's longevity by a decade or more compared to the same decline in year twelve.

The 2026 economic environment, with ongoing market volatility, elevated inflation, and uncertainty around interest rates, makes this risk particularly relevant right now. If you retired in the last two to three years, or are planning to retire in the next two to three years, stress-testing your plan against a bad-sequence scenario is not optional. It is essential.

What to do instead: Ask your financial advisor to run a "bad sequence" scenario, what happens to your plan if markets drop 25–30% in your first three years of retirement? If the answer makes you uncomfortable, consider building a two-to-three-year cash or short-term bond buffer that you can draw from during downturns, allowing your equity portfolio time to recover without being forced to sell at a loss.

Mistake 2: Getting Blindsided by Medicare IRMAA

Here is a surprise that catches a remarkable number of retirees completely off guard: your Medicare premium is not fixed. It is income-dependent. And if your income in a given year was higher than certain thresholds, even for a perfectly legitimate reason, like selling a rental property, taking a large IRA withdrawal, or receiving a severance package, you may find yourself paying dramatically more for Medicare than you expected.

This surcharge is called IRMAA, the Income-Related Monthly Adjustment Amount, and in 2026 it can push your Medicare Part B premium from the standard $202.90 per month all the way to $628.90 per month for high earners. That's a difference of more than $5,100 per year, per person. For a couple, that's over $10,000 per year in additional Medicare costs, triggered by a single year of elevated income that may have occurred two years earlier (IRMAA is calculated on a two-year lookback).

The 2026 IRMAA thresholds are:

Filing Status - Income Threshold - Monthly Part B Premium - Individual - Up to $109,000 - $202.90 (standard) - Individual $109,001 – $136,000 -$289.20

Individual - $136,001 – $163,000 - $375.50

Individual - $163,001 – $196,000 - $461.80

Individual - $196,001 – $500,000 - $548.10

Individual - Above $500,000 - $628.90

Joint - Up to $218,000 - $202.90 (standard)

Joint - $218,001 – $272,000 - $289.20

Joint - $272,001 – $326,000 - $375.50

Joint - $326,001 – $392,000 - $461.80

Joint - $392,001 – $750,000 - $548.10

Joint - Above $750,000 * $628.90

What to do instead: Work with a tax advisor or financial planner to project your income in the two years before Medicare eligibility and in every year thereafter. If you are planning a large IRA withdrawal, a Roth conversion, or a property sale, model the IRMAA impact before you act. In some cases, spreading a large withdrawal over two years instead of one can save thousands of dollars in Medicare premiums. And if your income drops significantly after a high-income year, because you've retired, for example, you can file an appeal with Social Security to have your IRMAA recalculated based on your current income.

Mistake 3: Underestimating Healthcare Costs Before Medicare

If you retire before age 65, you face a gap period during which you are no longer covered by employer health insurance but are not yet eligible for Medicare. Bridging that gap is one of the most expensive and least-discussed challenges in early retirement planning.

A 65-year-old retiring in 2025 can expect to spend up to $172,500 on healthcare costs over the course of their retirement, according to a recent report cited by the National Council on Aging. For those who retire at 60 or 62, the costs in the pre-Medicare years alone can be staggering. Individual health insurance premiums on the ACA marketplace for a 62-year-old can easily run $800 to $1,500 per month or more, depending on the state and coverage level, and that's before deductibles and out-of-pocket costs.

Many people who plan to retire early simply don't budget for this. They focus on their portfolio, their Social Security strategy, and their living expenses, and then discover in year one that healthcare is consuming a far larger share of their budget than they anticipated.

What to do instead: If you are planning to retire before 65, build a dedicated healthcare budget line that accounts for premiums, deductibles, and out-of-pocket maximums for each year until Medicare eligibility. Research ACA marketplace options in your state and understand how your income in retirement will affect your subsidy eligibility, because managing your taxable income carefully in early retirement can significantly reduce your healthcare costs. A health savings account (HSA), if you have access to one, is one of the most powerful tools available for bridging this gap.

Mistake 4: Having Savings but No Retirement Income Plan

This is the mistake that surprises people most, because it sounds paradoxical: you can have a substantial retirement nest egg and still run into serious trouble if you don't have a clear plan for converting that savings into reliable, sustainable income.

The accumulation phase of retirement planning, saving money, is relatively well understood. The distribution phase, turning savings into income you can actually live on without running out, is far more complex, and far fewer people have thought it through carefully.

The core challenge is this: when you are drawing down a portfolio in retirement, the order of your returns matters enormously (see Mistake 1 on sequence risk). But beyond that, you also need to manage taxes across multiple income sources, Social Security, RMDs from traditional IRAs and 401(k)s, Roth withdrawals, taxable brokerage accounts, and any pension income, in a way that minimizes your lifetime tax burden. Getting this wrong can cost tens of thousands of dollars over a 20 or 30-year retirement.

A 2026 rule change has added a new wrinkle for high earners: if you earned $150,000 or more in FICA wages in 2025, your 401(k) catch-up contributions must now be made as Roth contributions rather than pre-tax. This changes the tax math for many people who are still in their peak earning years and planning their final pre-retirement contributions.

What to do instead: Before you retire, ideally two to five years before, work with a fee-only financial planner to build a comprehensive retirement income plan that addresses: which accounts to draw from in which order, when to claim Social Security, how to manage RMDs, and how to minimize taxes across all income sources. This is not a one-time exercise. It should be reviewed annually, because tax laws, market conditions, and your personal circumstances all change.

Mistake 5: Planning the Finances but Not the Life

This is the mistake that the financial industry almost never talks about, and it may be the most consequential one of all.

You can have a perfect financial plan, a fully funded portfolio, a carefully optimized Social Security strategy, and a tax-efficient withdrawal plan, and still be deeply unhappy in retirement. Because retirement is not primarily a financial event. It is a life event. And the life side requires just as much planning as the financial side.

The 2026 EBRI Retirement Confidence Survey found that confidence in having enough money for retirement has declined even as savings rates have improved, and researchers believe a significant part of that anxiety is driven not by financial insecurity but by the emotional and psychological uncertainty of what retirement will actually feel like. People don't just worry about running out of money. They worry about running out of purpose.

The research on this is unambiguous. As we explored in our piece on the 85-year Harvard Study of Adult Development, the quality of your relationships and the depth of your sense of purpose are stronger predictors of happiness and health in retirement than financial security. And as we detailed in seven things the happiest retirees do differently, the retirees who thrive are the ones who retire to something, a purpose, a community, a set of meaningful activities, not just from a job.

The most common version of this mistake is what we call the "vacation that never ends" trap. Many people imagine retirement as an extended vacation, travel, golf, leisure, freedom from obligation. And for the first six to twelve months, it often feels exactly like that. But without structure, purpose, and genuine connection, the novelty fades and a quiet emptiness can set in that no amount of travel or leisure can fill.

What to do instead: Give your non-financial retirement plan the same rigor you give your financial plan. Before you retire, answer these questions in writing: What will I do with my mornings? Who will I see regularly? What am I contributing to that is larger than myself? What am I learning? What does a great week in retirement actually look like for me? If you can't answer these questions clearly, that's not a sign that you're not ready, it's a sign that you have important work to do before you are.

We've written a full guide on how to enjoy retirement fully that walks through this process in depth, and we encourage you to read it alongside your financial planning.

The Bigger Picture

These five mistakes share a common thread: they are all the result of planning for the obvious and missing the less obvious. The financial industry does an excellent job of helping people save money. It does a much less consistent job of helping people think through the tax traps, healthcare gaps, income conversion challenges, and life-design questions that determine whether retirement is actually good.

The good news is that every one of these mistakes is avoidable. Not by being smarter or luckier, but by asking the right questions early enough to act on the answers.

As we noted in our piece on what YouTube's most popular retirement videos are saying in 2026, the retirement content that is resonating most with people right now is not about maximizing returns or optimizing withdrawal rates. It's about building a retirement that is genuinely worth living, financially secure, yes, but also purposeful, connected, and full of life. That's what we're here to help you build.

Your Action Steps This Week

1. Schedule a retirement stress test. Call your financial advisor and ask them to model a bad-sequence scenario, a 25–30% market decline in your first three years of retirement. If you don't have an advisor, this is a good reason to find one.

2. Check your IRMAA exposure. Pull your tax return from two years ago and check your modified adjusted gross income against the 2026 IRMAA thresholds in the table above. If you're close to a threshold, talk to a tax advisor about strategies for managing your income.

3. Write down your non-financial retirement plan. Spend 30 minutes answering the life-design questions above. What will you do with your mornings? Who will you see regularly? What are you contributing to? What does a great week look like? The answers matter as much as the numbers.

For more on building a retirement that's rich in both financial security and genuine happiness, explore our full library at Turnkey Retirement Survival Pro. And don't miss our smart downsizing tips for retirees one of the most practical financial and lifestyle moves you can make in the years leading up to or just after retirement.