Every American With a 401(k) Has Until End of 2026 to Do This — The Window Closes Permanently

Added: 2026-05-24

[00:00:00]Diane Kowalsski stared at her $387,000 401k statement and realized the money was not fully hers. She was 64 years old, a retired high school principal in Boise, Idaho, and she had just learned the IRS would eventually force that money out whether she needed it or not.

[00:00:19]Last October, she called her nephew, a CPA in Denver, and said seven words she had never said before in her life. I think I made a very expensive mistake.

[00:00:30]Every dollar she pulled out of that 401k would be taxed as ordinary income on top of her social security, on top of whatever other income she had. She had assumed the government would leave her retirement savings alone. Nobody told her it would not. What Diane did not know, and what most Americans with a 401k still do not know, is that 2026 is not just another retirement year. It is a year where several retirement tax decisions have to be made before the calendar closes.

[00:00:59]Some rules continue after 2026. Some deductions continue through 2028. But your 2026 401k contribution window, your 2026 catch-up window, and your 2026 tax year Roth planning window close on December 31st. And once a tax year closes, you do not get to go back and redo it. That is the window, not a rumor, not a scare tactic, a real calendar year deadline that disappears when the year ends. If you have a 401k, a traditional IRA, or any pre-tax retirement account, this video is for you. My name is Jonathan Mercer. Every week on Tax-Free Retirement, I break down the tax rules, the hidden traps, and the strategies that protect retirees from the things nobody else is explaining. Before we go any further, I am not your financial adviser. I am not your CPA. Nothing in this video is personalized financial or tax advice.

[00:01:53]You should always speak with a licensed professional before making any changes to your retirement plan. What I am doing today is explaining what the law actually says so you can walk into that conversation fully informed. Most people with a 401k believe the same thing. They believe they are doing everything right.

[00:02:11]They contributed every year. They got the employer match. They watched the balance grow. And they think that when they retire, they will simply pull money out slowly and pay a little tax here and there. That sounds reasonable. Here is what they are missing. A traditional 401k is not just a retirement account.

[00:02:29]It is a future income machine. And when that income comes out, the tax code does not treat it gently. It stacks. It stacks on top of social security. It stacks on top of pension income. It stacks on top of interest, dividends, part-time work, and capital gains. And in retirement, stacked income can quietly trigger taxes, Medicare sir charges, and forced withdrawals that people never planned for. Nobody sits you down and shows you the numbers.

[00:02:57]There is no letter in the mail at age 55 saying, "Here is what your 401k could cost you at age 73." So today, we are going to walk through five things every 401k owner should check before 2026 ends. Number three is the one many workers between 60 and 63 miss completely. And number five changes how your children or grandchildren may inherit your retirement money. Stay with me because one missed year can become a lifetime tax bill. Number one, the rule that turns your 401k into a tax time bomb. This is where everything starts.

[00:03:32]Under current secure 2.0 rules, most people with a traditional 401k or traditional IRA must begin taking required minimum distributions at age 73. These are called RMDs. The IRS calculates how much you must withdraw each year based on your account balance and your life expectancy. You do not get to choose the minimum. You do not get to say no. You do not get to wait forever.

[00:03:57]If you miss an RMD or take less than you are supposed to, the penalty can be 25% of the amount you should have taken.

[00:04:04]That is not a typo. 25%. Now, here is where it gets uncomfortable. Let's go back to Diane. She has $387,000 in her 401k today. If she does nothing, makes no changes, takes no action, and simply lets it grow, that account could be worth somewhere between $500,000 and $600,000 by the time she turns 73, depending on market performance. At that point, the IRS may require her to withdraw roughly $19,000 to $23,000 per year from that account every single year. whether she needs the money or not, that income gets stacked on top of her social security. It gets stacked on top of any pension income. It gets stacked on top of whatever interest, dividends, or part-time income she has.

[00:04:54]And here is the cruel irony nobody talks about. When your income rises in retirement, Medicare can use that number against you. This is not technically an IRS penalty. It is part of the Medicare IRMA system. the income related monthly adjustment amount. The Roth conversion 401k withdrawal or RMD is reported as taxable income on your federal tax return. Then Medicare and Social Security use that income information to determine whether your future Medicare Part B and Part D premiums should be higher. For 2026, the standard Medicare Part B premium is $22.90 per month. But if your modified adjusted gross income is above $19,000 as a single filer or above $218,000 as a married couple filing jointly, you begin paying higher Medicare premiums.

[00:05:45]So the RMD forces income up. That higher income may trigger higher Medicare costs. And the retiree gets hit twice.

[00:05:53]Once through income tax and again through higher Medicare premiums. That is not because Diane was careless. The system was built this way. Nobody explains this when you start contributing to your first 401k at age 29. Nobody says congratulations on saving. By the way, someday the government will force this money out and count it against you. That is why 2026 matters. Not because every retirement rule disappears at midnight, but because every tax year you fail to plan gives the system one more year to build a larger tax problem. And the next piece is where the planning window gets real.

[00:06:27]Number two, the Roth conversion window.

[00:06:30]and why 2026 matters.

[00:06:33]For years, financial professionals have recommended Roth conversions as one way to reduce future RMD pressure. Here is how it works. You take money from a traditional 401k or traditional IRA, money that has not yet been taxed, and you convert it to a Roth IRA. You pay ordinary income tax on the amount you convert today. In exchange, that money can grow tax-free in the Roth and qualified Roth withdrawals can be federal income taxfree later. Most importantly, Roth IAS do not have lifetime RMDs for the original owner.

[00:07:07]That one detail can change an entire retirement. But I won't sugarcoat this.

[00:07:13]A Roth conversion is not always the right move. If you convert too much in one year, you can push yourself into a higher tax bracket. You can increase the taxable portion of social security. You can trigger IRMAa sir charges. You can create a tax bill you were not ready to pay. That is why the question is not should everyone convert everything. The real question is how much can you convert safely in the right year? And 2026 matters because current law gives some retirees extra room to plan. The One Big Beautiful Bill Act introduced a new senior deduction for taxpayers aged 65 and older. Under current IRS guidance for tax years 2025 through 2028, eligible taxpayers aed 65 or older may claim an additional $6,000 deduction.

[00:08:02]For a married couple where both spouses qualify, that can be $12,000.

[00:08:06]This is on top of the existing standard deduction rules, but it is not unlimited. The deduction phases out for taxpayers with modified adjusted gross income above $75,000 for single filers and above $150,000 for joint filers. So, here is the strategic point. A retiree aged 65 or older may have more deduction room available during this 2025 through 2028 window than they expected. That deduction room may help absorb part of a Roth conversion, but only if the conversion is calculated carefully. Let me give you a clean example. Imagine a 66-year-old married couple in Tennessee.

[00:08:45]They have little taxable income because they are delaying social security. They have no pension and they are living partly from cash savings. Their standard deduction, age-based deduction, and new senior deduction together may create a large amount of income that is offset before federal taxable income begins. If they convert a carefully chosen amount from a traditional IRA to a Roth IRA, part of that conversion may fit into a very low tax or even near zero tax zone.

[00:09:12]But if that same couple already has pension income, social security income, dividends, interest and capital gains, the result can be completely different.

[00:09:21]Same Roth conversion, different tax result. That is why you do not guess, you calculate.

[00:09:28]Most people hear Roth conversion and think it is all or nothing. Here is what they are missing. The smartest conversions are usually partial conversions, not emotional, not random, not based on a YouTube comment, based on tax brackets, deductions, Medicare thresholds, and your future RMD projection. Diane did not know this. She thought the decision was simple. Leave the 401k alone and deal with it later.

[00:09:53]But later is where the trap lives. And number three is the one that surprises people the most. Number three, the super catch-up most people have never heard of. Here is the fact that sounds wrong but is completely true. If you are age 60, 61, 62, or 63 in 2026, you may be allowed to contribute more to your 401k than almost anyone else in the country.

[00:10:18]Under secure 2.0, certain workers in that age range get a higher catch-up contribution limit. In 2026, the regular 401k contribution limit is $24,500.

[00:10:30]Workers aed 50 and older can generally add an $8,000 catch-up contribution.

[00:10:35]That means many workers aged 50 and older can contribute up to $32,500 in 2026. But workers who are aged 60, 61, 62, or 63 may qualify for a higher catch-up amount of $11,250 instead of $8,000.

[00:10:53]That makes the total potential employee contribution $35,750 in 2026. That is not a small difference.

[00:11:01]That is an extra $3,250 above the normal age 50 catch-up amount.

[00:11:07]For someone in the 22% federal tax bracket, that extra $3,250 pre-tax contribution may reduce federal income tax by about $715 for the year.

[00:11:19]And the full $35,750 contribution, if made pre-tax and if allowed by the plan, could shelter thousands of dollars from current federal income tax. But the bigger point is not just one year of tax savings. The bigger point is that age 60 to 63 is a narrow window. Once you age out of it, you do not get to go back. A 64 year old cannot say, "I forgot to use my age 62 super ketchup. Can I apply it now?" No, that year is gone. The paycheck year is gone. The deferral opportunity is gone.

[00:11:53]That is gone. And here is the catch nobody mentions enough. Beginning in 2026, certain high earners must make catch-up contributions on a Roth basis if their prior year wages from that employer were more than $150,000.

[00:12:08]That means the plan's Roth feature matters. If your employer's plan does not properly allow Roth catchup contributions, you need to know that before the year is over. Not in January, not after payroll closes, not after the W2 is already issued. If you are between 60 and 63, you need to call HR or your plan administrator and ask a simple question. Am I eligible for the 2026 higher catchup contribution? And does this plan support Roth ketchup contributions if required? One phone call, under 30 minutes, potentially thousands of dollars in tax planning preserved. This is why the title of this video matters. The end of 2026 is not some dramatic date pulled out of thin air. It is the end of a real tax year.

[00:12:53]It is the end of a real payroll year. It is the end of a real contribution year.

[00:12:58]And when it closes, you cannot reopen it. Number four, two fictional retirees, one decision, completely different outcomes.

[00:13:09]Let me show you what this can look like through two fictional but realistic retirees. Same age range, similar retirement balances, different decisions. Meet Robert Hensley. He is 62 years old, recently retired, and lives in Scottsdale, Arizona. He spent 28 years as an aircraft maintenance technician. He has $420,000 in a traditional 401k. He receives a small pension of $18,000 per year. He plans to claim social security at 67. Robert heard about Roth conversions 3 years ago. A coworker mentioned it at lunch.

[00:13:43]He meant to look into it. Life got busy.

[00:13:45]He never did. Now meet Carol Espinosa.

[00:13:48]She is 62 years old and lives in Albuquerque, New Mexico. She spent her career as a registered nurse. She has $390,000 in a traditional 401k.

[00:14:00]She receives about $20,000 per year from a pension. She also plans to claim social security at 67. Carol started asking questions in 2024. Not because she was rich, not because she loved tax planning, because she realized that her 401k balance was not the same as her after tax retirement money. In 2026, Carol sits down with a CPA and reviews a partial Roth conversion. They do not convert everything. They do not guess.

[00:14:29]They look at her pension, her deductions, her tax bracket, her social security timing, and her future RMD projection. They decide that a $28,000 Roth conversion fits her situation. She pays tax on that conversion. Now, it is not painless, but it is controlled.

[00:14:47]Robert pays nothing this year. He is waiting. That feels good today. But here is the math over time. If Robert's account keeps growing and reaches roughly $700,000 by age 73, his first RMD could be around $27,000.

[00:15:02]That $27,000 stacks on top of his pension. Later, it stacks on top of social security. It may increase the taxable portion of his social security.

[00:15:12]It may push him closer to Medicare RMA thresholds, and he will be forced to repeat that process every year. Carol's future looks different. By converting partial amounts over several lower income years, she may reduce the size of her future traditional balance. That can reduce future RMD pressure. That can reduce taxable income later. That can reduce the chance of accidentally crossing Medicare thresholds. The difference over 15 or 20 years can be tens of thousands of dollars. For some households, it can be $40,000. For others, $70,000. For larger balances, even more. That is a car. That is a roof. That is years of Medicare premiums. That is money that stays in the family instead of leaking out because nobody explained the timing.

[00:15:58]Most people here wait until retirement and stop thinking. Here is what they are missing. Retirement is not one tax event. It is a sequence. Age 60, age 62, age 65, age 67, age 70, age 73. Each age changes something. Each age opens or closes something. And if you treat all retirement years the same, the tax code quietly wins.

[00:16:26]Number five, the counterintuitive reveal nobody talks about. Here is the thing most people miss. A Roth conversion is not only about your retirement. It may also be about what your children inherit. Most people think a Roth conversion is a tax you pay today to avoid tax tomorrow. That is how it gets sold. Pay now, save later. That framing is incomplete. When you convert traditional 401k or IRA money to Roth money, you are not only changing your future tax bill, you may also be changing the tax character of the money your children or grandchildren receive.

[00:17:02]Under the Secure Act rules, many non-spouse beneficiaries who inherit a traditional IRA or traditional retirement account must empty the inherited account within 10 years. Every dollar they withdraw from a traditional account is generally taxable to them as ordinary income. That matters because your children may inherit during their peak earning years. Imagine a 52-year-old engineer in North Carolina.

[00:17:28]She earns $148,000 per year. Then she inherits a $400,000 traditional IRA from a parent. She cannot just ignore it forever. Under the 10-year rule, she may need to empty that inherited account within the required period. If she pulls out $40,000 per year, that $40,000 stacks on top of her salary. If she pulls out more in one year, the tax impact can be even worse.

[00:17:55]She inherited money, but she also inherited the tax bill. Now, compare that with a qualified Roth account. The 10-year rule may still apply to many non-spouse beneficiaries. But qualified Roth distributions can be federal income tax-free. That means the beneficiary may still have to empty the account within the required period, but the tax character is very different. They inherit the money. They keep more of the money. This is not a loophole. This is planning. And it is one of the reasons the Roth decision cannot be reduced to one question. Will my tax rate be lower today or tomorrow?

[00:18:31]That matters, but it is not the only question. You also have to ask, will RMDs force income I do not need. Will social security become more taxable?

[00:18:42]Will Medicare premiums rise? Will my spouse be left with a worse tax situation? Will my children inherit a tax bill instead of an asset? That is the bigger picture. And this is where the system feels so unfair. People did what they were told. They saved in the plan. They took the match. They delayed gratification. They built a balance.

[00:19:04]Then decades later, they discover the balance was never fully theirs. Part of it always belonged to future taxes.

[00:19:11]Nobody told them. Every single year, the too late warning and the hopeful exit. I want to tell you about another fictional but realistic example. Marcus Webb is 76 years old. He is a retired federal employee living in Columbus, Ohio. He spent 31 years with the postal service.

[00:19:30]He has $510,000 in the Thrift Savings Plan, the federal government's version of a workplace retirement plan. Marcus started RMDs at 73. Now he is withdrawing about $21,000 per year. That is on top of his federal pension of $38,000.

[00:19:47]That is on top of Social Security. His income is no longer something he controls easily. The withdrawals are required. The pension is fixed. the social security is already turned on.

[00:19:58]Then one year, a larger withdrawal, extra interest income, and a small capital gain push his modified adjusted gross income above a Medicare IRMA threshold. His part B premium goes up.

[00:20:10]His Part D premium may also carry an extra sir charge. And here's the part that hurts. Paying IRMAa does not give him better Medicare. It does not give him a better doctor. It does not give him a better hospital room. It is just a higher premium because his income crossed a line. That is $81.20 more per month for part B in the first 2026 Irma tier. That is $974.40 per year. If his part D also has the first tier Irma amount, that adds $14.50 per month. That is another $174 per year. together that is $1,14840 per year. Over 10 years that is $11,484.

[00:20:59]Over 20 years that is $22,968.

[00:21:05]That is not a vacation. That is not a gift to the grandkids. That is not home repairs. That is a sir charge. Marcus is not stupid. He is not irresponsible. He is simply late. The conversions he could have considered in his early 60s are harder now. The low income years he could have used are gone. The catch-up contribution windows are gone. The planning flexibility is smaller. You are not Marcus. Not yet. If you are 55, 60, 62, 65, or even early 70s, the window may still be open, but it is not open in the same way forever. If you are still working, your 2026 contribution window closes when payroll closes. If you are 60 to 63, your higher catch-up window is age limited. If you are 65 or older, the enhanced senior deduction currently exists only through 2028. If you are approaching Medicare, your income today can affect your future premiums because IRMA uses prior year tax information.

[00:22:09]That is why waiting can become expensive. Not because the system sends you a bill labeled mistake. It just quietly applies the rules.

[00:22:18]Your action checklist. Five steps under 30 minutes each.

[00:22:23]Here are five specific actions you can take right now. Every one of them can be completed in under 30 minutes. Step one, pull your most recent 401k, 403b, TSP, or IRA statement. Find the total pre-tax balance. Write it down. That is your starting number. You cannot plan around a number you have never looked at. This takes 10 minutes. Step two, go to IRS.gov and search for publication 590-B.

[00:22:56]This is the IRS publication that explains distributions from IAS, including required minimum distribution concepts. You do not need to become a tax professional. You just need to understand the basics before someone else explains them too late. This takes 20 minutes. Step three, if you are aged 60, 61, 62, or 63 in 2026, call your HR department or plan administrator, ask two questions. First, am I eligible for the higher secure 2.0 catch-up contribution in 2026?

[00:23:30]Second, does this plan allow Roth ketchup contributions if I am required to make ketchups on a Roth basis? This one call could protect a contribution opportunity you cannot recreate later.

[00:23:41]It takes 15 minutes. Step four, go to ssa.gov or medicare.gov and review the 2026 Medicare IRMA income thresholds for 2026. The first Irma threshold begins above $19,000 for single filers and above $218,000 for married couples filing jointly.

[00:24:04]Estimate your income for the year.

[00:24:06]Social Security, pension, withdrawals, interest, dividends, capital gains, Roth conversions. Know your number before it surprises you. This takes 20 minutes.

[00:24:19]Step five, call a fee onlyly fiduciary financial adviser or a CPA who specializes in retirement tax planning.

[00:24:27]Do not ask a vague question like, "Should I do a Roth conversion?" Ask a better question. Can you help me calculate a partial Roth conversion strategy for 2026 that considers my tax bracket, future RMDs, Social Security taxation, Medicare IRMA, and the current senior deduction rules if I qualify?

[00:24:47]That is a serious question. That is the kind of question that can change a retirement. Bring your 401k balance.

[00:24:54]Bring your pension estimate. Bring your social security estimate. Bring last year's tax return. This conversation may be the most valuable 30 minutes you spend this year. You do not have to fix everything today, but you do need to start before the year closes. The tax code does not wait.

[00:25:12]Closing. Call to action.

[00:25:15]If this video gave you one number you did not know before or one rule you are going to act on, hit like. It takes 1 second and it puts this information in front of retirees who need these numbers and have no idea this window exists.

[00:25:28]Subscribe if you want to keep getting this kind of breakdown every week. No fluff, no products, just the rules, the numbers, and the strategies. And drop a comment below. Tell me the number that surprised you most in this video. 2 seconds. I read every single one. This is Jonathan Mercer with Tax-Free Retirement.