Why Do Retirement Taxes Surprise So Many People — Even Those Who Planned Ahead?
Retirement taxes don't automatically go down once you stop working. For a lot of retirees, taxes actually become more complicated once Social Security starts, retirement account withdrawals begin, and required minimum distributions kick in. And most people don't discover this until it's already happening.
In this video, we walk through how retirement taxes really work in plain English, where the surprises tend to come from, and how smart planning during the right window may help reduce them.
If you're between 55 and 70, this may be one of the most important tax-planning windows of your life. The decisions you make during these years can dramatically affect how much you keep in retirement. You may also find our video on the retirement tax mistake most people miss helpful for understanding how account structure creates tax problems down the road.
The Three Tax Buckets of Retirement Income
One of the biggest misconceptions retirees have is that all retirement income is taxed the same way. It isn't. Retirement income typically comes from three different buckets, and each one has its own tax treatment.
Bucket One: Tax-Free Income
This includes Roth IRA and Roth 401(k) withdrawals, assuming certain rules are met. Qualified withdrawals from Roth accounts generally don't increase your taxable income. That gives retirees more flexibility to manage their tax picture later in life, particularly when managing Social Security taxation thresholds and Medicare premium surcharges.
Bucket Two: Tax-Deferred Income
This is where most people have the majority of their retirement savings. Traditional IRAs, 401(k)s, 403(b)s, and SEP IRAs. These accounts offered a tax deduction when the money went in. The tradeoff is that the IRS eventually wants their share back. When you withdraw money from these accounts in retirement, those withdrawals are generally taxed as ordinary income, stacking on top of Social Security and any other income sources.
Bucket Three: Taxable Investment Accounts
Brokerage accounts where you own stocks, ETFs, or mutual funds. These accounts are taxed differently because you're typically taxed on gains, dividends, and interest rather than on every dollar you withdraw. In many situations, those taxes come at capital gains rates, which are often significantly lower than ordinary income tax rates. For some retirees, long-term gains may even fall into the 0% capital gains bracket depending on their income level.
The Social Security Tax Surprise
Many people assume Social Security is tax-free because they paid into the system their entire working life. But depending on your income, up to 85% of your Social Security benefits can become taxable.
The IRS uses a formula called combined income to determine how much of your Social Security is taxable. That formula includes half of your Social Security benefits, plus retirement account withdrawals, plus other income sources, and even certain tax-exempt interest.
What often happens is this: someone begins taking Social Security while also withdrawing from a traditional IRA or 401(k), and suddenly a larger portion of their Social Security benefit becomes taxable. Their spending hasn't changed. But their tax bill has. That's the surprise most retirees don't see coming.
For a deeper look at how this calculation works, see our video on why your Social Security may be taxed more than you expect .
Required Minimum Distributions and the Planning Window Before Them
At a certain age, the IRS requires you to start taking withdrawals from tax-deferred retirement accounts whether you need the money or not. Under current law, that age is generally 73, or age 75 if born in 1960 or after. These are called required minimum distributions, and they're taxed as ordinary income in the year you take them.
This is one reason why the years between retirement and the start of required minimum distributions can be one of the most valuable tax-planning windows of your life. During those years, you may temporarily be in a lower tax bracket. Social Security may not have started yet. RMDs haven't begun. Your income is lower overall.
That window creates meaningful opportunities for strategies like Roth conversions or more intentional withdrawal sequencing. But if you wait too long, that flexibility narrows significantly.
Capital Gains and Tax Diversification
Capital gains taxes are an area that often gets overlooked in retirement planning. When you sell investments held longer than a year, you may qualify for long-term capital gains rates, which are often lower than ordinary income tax rates. Depending on your income level, some gains may even fall into the 0% capital gains bracket.
This is why diversification in retirement isn't just about investment mix. It's also about tax diversification. Having money spread across accounts with different tax treatments creates more flexibility when building retirement income each year. You can choose which bucket to pull from based on your tax situation rather than being forced to take everything from one source.
For a broader look at how this strategy works in practice, see our video on why $2 million isn't enough if it's in the wrong accounts .
Frequently Asked Questions About How Retirement Taxes Work
Do taxes go down in retirement?
Not necessarily, and for many retirees they actually increase or become more complicated. Once Social Security begins, retirement account withdrawals start, and required minimum distributions kick in, multiple income sources stack together and interact with each other in ways that can push taxable income higher than expected. The IRS taxes Social Security benefits based on combined income, Medicare premiums are income-based, and required minimum distributions force taxable withdrawals regardless of need. Retirees who didn't plan for this are often surprised by a higher tax bill than they anticipated.
How is retirement income taxed?
Retirement income is taxed differently depending on where it comes from. Withdrawals from traditional IRAs, 401(k)s, and other tax-deferred accounts are taxed as ordinary income. Qualified withdrawals from Roth IRAs and Roth 401(k)s are generally income-tax-free. Income from taxable brokerage accounts is typically taxed at capital gains rates, which are often lower than ordinary income rates. Social Security benefits may be partially taxable depending on your combined income. Understanding which bucket each source of income comes from is one of the most important parts of retirement tax planning.
How much of Social Security is taxable?
Depending on your combined income, up to 85% of your Social Security benefits can be subject to federal income tax. The IRS calculates this using a formula that includes half of your Social Security benefits plus all other income sources including retirement account withdrawals and certain tax-exempt interest. For married couples filing jointly, once combined income exceeds $44,000, up to 85% of the benefit is included in taxable income. These thresholds haven't been adjusted for inflation since 1993, which means more retirees are affected each year.
What are required minimum distributions and why do they matter for taxes?
Required minimum distributions are mandatory annual withdrawals from traditional IRAs, 401(k)s, and most other tax-deferred retirement accounts. Under current law, the starting age is generally 73, or age 75 if born in 1960 or after. The amount is calculated based on your account balance and IRS life expectancy tables. Every dollar withdrawn is taxed as ordinary income in the year it's taken. If your account balances are large, required minimum distributions can push you into a higher bracket, increase the taxable portion of your Social Security benefit, and trigger Medicare premium surcharges, regardless of whether you actually need the money.
What is a Roth conversion and when does it make sense?
A Roth conversion moves money from a traditional pre-tax retirement account into a Roth IRA. You pay income tax on the converted amount in the year of conversion, and from that point the money grows tax-free and qualified withdrawals are generally income-tax-free. Conversions tend to make the most sense during lower-income years, typically after retirement but before Social Security and required minimum distributions begin. During that window your tax bracket may be lower, making the cost of conversion more favorable. Done strategically over several years, Roth conversions can reduce the pre-tax balance that generates forced taxable income later in retirement.
What is tax diversification in retirement?
Tax diversification means having retirement savings spread across accounts with different tax treatments: tax-deferred accounts like traditional IRAs and 401(k)s, tax-free accounts like Roth IRAs, and taxable brokerage accounts. When you have assets in all three buckets, you can choose which source to draw income from each year based on your tax situation. That flexibility lets you manage taxable income to stay below key thresholds for Social Security taxation, Medicare premium surcharges, and capital gains rates. Two retirees with identical balances can have very different tax outcomes based entirely on how those balances are distributed across account types.
What is the best tax-planning window before retirement?
The years between retirement and the start of required minimum distributions, typically between your early 60s and age 73 or 75, are often the most valuable tax-planning window available. During this period, income may be lower because you're no longer working, Social Security may not have started, and RMDs haven't kicked in yet. That lower-income window creates opportunities for Roth conversions at favorable rates, strategic brokerage account harvesting, and deliberate withdrawal sequencing. Waiting until after RMDs and Social Security have both started reduces your options significantly.
How do capital gains fit into retirement tax planning?
Long-term capital gains, from investments held more than a year, are taxed at lower rates than ordinary income. Depending on your income level, the rate is 0%, 15%, or 20%. For retirees who manage their taxable income carefully, some gains may fall entirely into the 0% bracket. Taxable brokerage accounts can serve as a flexible income source that generates lower-taxed income compared to traditional IRA withdrawals. This is one reason why having assets outside of retirement accounts, in addition to pre-tax and Roth accounts, gives retirees more tools to manage their annual tax picture.
Want a Clear Picture of Your Retirement Readiness?
Take our free Retirement Readiness Assessment. It takes less than a minute and gives you a high-level view of your retirement readiness across income, investments, taxes, healthcare, and overall planning.
Investment advice is offered through Bayntree Wealth Advisors, LLC, an SEC-registered investment adviser. Insurance and annuity products are offered separately through Bayntree Wealth Advisors. Bayntree does not provide, and no statement contained herein shall constitute, tax or legal advice. You should consult a tax or legal professional on any such matters. Opinions expressed herein are solely those of Bayntree Wealth Advisors. All content is for informational purposes only and is not intended to provide the basis for any financial decisions.
Bayntree Wealth Advisors is not affiliated with the U.S. government or any governmental agency, including the Social Security Administration.
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