Last reviewed: July 2026
Most people carry one assumption into retirement planning: when the paycheck stops, so does most of the tax bill. For retirees with substantial pre-tax savings, that assumption is often wrong. The retirement tax rate for many households ends up well above what they projected, because Social Security taxation, required minimum distributions, and investment income interact in ways that most pre-retirees never model.
Key Takeaways
- The assumption that taxes fall in retirement often fails for households with large pre-tax savings.
- Per the IRS, up to 85% of Social Security is taxable above $44,000 combined income for joint filers, a 1993 threshold never indexed.
- RMDs stack on Social Security and pensions; at 73 the factor is 26.5, so a $1,200,000 IRA forces about $45,283.
- The ‘tax torpedo’ can drive effective marginal rates above 40% as each dollar also taxes more of your Social Security.
- Roth distributions don’t count toward these thresholds, so pre-73 conversions can lower your retirement tax rate.
About the Author
About the Author: Jeff Judge, CFP®, AEP®, ChFC®, CLU® is a financial planner who writes Viewpoints for JeffJudgeCFP.com. He helps families and business owners project the stacked retirement tax picture before 65 and lower it with conversions and withdrawal sequencing, using the R.U.D.D.E.R. Method™, the financial planning process Jeff developed. “This stacking problem tends to hit the people who did everything right. The reward for decades of disciplined saving is a tax bill in retirement that nobody warned them about.”
What Determines Your Tax Rate in Retirement?
This is where the assumption breaks down. Retirement tax rates aren’t set by a single income source. They’re built from multiple streams stacking on top of each other, each one affecting how the others get taxed.
What income sources count in retirement?
Required minimum distributions from traditional IRAs and 401(k)s, Social Security benefits (partially or fully taxable), pension income, withdrawals from any pre-tax accounts, and investment income from taxable brokerage accounts all figure into your taxable income picture. These sources don’t just add up arithmetically. Some of them trigger taxation on others.
How is Social Security taxed in retirement?
According to the IRS, up to 85% of Social Security benefits become taxable when combined income (adjusted gross income plus nontaxable interest plus half of Social Security) exceeds $44,000 for married filing jointly. That threshold was written into law in 1993. The IRS has never adjusted it for inflation, which means far more retirees cross it today than Congress originally intended.
What is the Net Investment Income surtax?
The IRS imposes a 3.8% Net Investment Income surtax on dividends, capital gains, and interest for married filing jointly households with modified adjusted gross income above $250,000. This sits on top of ordinary income rates. Retirees with significant taxable portfolios often discover this surcharge in years when capital gain distributions hit from mutual funds they’ve held for decades.
Does Roth income count toward these thresholds?
Qualified Roth distributions don’t count. This is the fundamental reason Roth conversions done before RMDs begin can meaningfully lower your retirement tax rate. Pre-tax money converted in lower-income years doesn’t show up in the combined income calculation when Social Security benefits are in play later.
Why does Social Security taxation catch people flat-footed?
The $44,000 MFJ threshold for maximum Social Security taxation has been in place since 1993. When it was written, only a small fraction of Social Security recipients owed tax on their benefits. Forty-plus years of inflation and wage growth have changed that math entirely.
Consider a married couple retiring today with $36,000 in combined Social Security income. Their combined income formula already starts at $18,000 (half of benefits) before they add anything else. Add a $40,000 RMD and modest dividend income, and they’ve cleared the 85% inclusion threshold without doing anything unusual. For most retirees with meaningful pre-tax savings, crossing $44,000 in combined income is the default outcome, not the exception.
The practical result is what’s often called the “Social Security tax torpedo” (a band of income where effective marginal rates spike above the published bracket because each additional dollar simultaneously makes more Social Security benefits taxable). In some income ranges, the effective marginal rate on an extra dollar of income can run 40% or higher due to this stacking effect. That’s not a hypothetical. It’s the math that applies when two things are taxed at once.
Most people discover this at tax time during their first full year of retirement. By then, the income is already locked in.
What is the Social Security tax torpedo?
It’s the band of income where each extra dollar makes more of your Social Security taxable at the same time it’s taxed itself. In that range the effective marginal rate can top 40%, well above the published bracket. It catches retirees who assumed leaving work meant a lower rate.
How do RMDs and investment income create a tax stacking problem?
Required minimum distributions start at age 73 under SECURE 2.0, per the IRS. Using the IRS Uniform Lifetime Table, the distribution factor at age 73 is 26.5. A retiree with a $1,200,000 IRA at that point owes an RMD of roughly $45,283 in year one. By age 80, the factor drops to 20.2, which means each dollar in the account forces a larger percentage withdrawal year over year.
That RMD hits taxable income directly. It stacks on top of Social Security. It stacks on top of any pension. And in years when taxable accounts also generate dividends, capital gain distributions from mutual funds, or the retiree sells appreciated positions, those amounts layer in too.
Long-term capital gains are taxed by the IRS at 0%, 15%, or 20%, depending on income level. But the income level that determines the rate includes RMDs. A retiree who projects paying 0% on long-term gains because they’ve left the workforce may find that RMDs push total income into the 15% or 20% bracket. Add the possibility that total modified AGI crosses IRMAA thresholds and Medicare Part B and Part D premiums rise as well. The taxes aren’t just the rate on the gain. They’re the rate plus the downstream effects that arrive the following year.
This is the retirement tax stacking problem. It’s not a penalty for doing something wrong. It tends to affect the people who did the right things: consistent 401(k) contributions for decades, a long career that built substantial Social Security credits, a taxable investment account accumulated alongside retirement accounts. The more prepared you were, the more this math applies to you.
Why can your capital gains rate jump once RMDs begin?
Because the rate on long-term gains, 0%, 15%, or 20%, depends on total income, and RMDs count. A retiree expecting 0% on gains can be pushed to 15% or 20% once required distributions stack on top, and the higher income can also trigger IRMAA the next year.
Frequently Asked Questions
Will my tax rate really be lower in retirement?
Not necessarily. For households with large pre-tax balances, required minimum distributions, taxable Social Security, and investment income stack into a higher rate than expected. The common assumption that taxes drop when the paycheck stops often fails precisely for the people who saved diligently.
How much of Social Security is taxable?
Per the IRS, up to 85% of benefits become taxable once combined income, which is adjusted gross income plus tax-free interest plus half of Social Security, exceeds $44,000 for joint filers. That threshold has not been indexed since 1993, so most retirees with pre-tax savings now cross it.
How do RMDs raise your taxes?
Per the IRS, RMDs begin at 73 using a factor of 26.5, so a $1,200,000 IRA forces roughly $45,283 in year one. That income stacks on Social Security and pensions, can lift your capital gains rate, and may push you across IRMAA thresholds the following year.
How can you lower your retirement tax rate?
Act in the lower-income years before 73. Roth conversions shrink the balance that drives future RMDs, tax-loss harvesting trims future gains, and withdrawal sequencing across Roth, taxable, and pre-tax accounts keeps annual income below key thresholds. Roth dollars do not count toward Social Security or surtax thresholds.
What can you do before the tax picture gets set?
Once RMDs start, your flexibility narrows. The years between your last paycheck and age 73 are the clearest window for reducing future taxable income before it becomes mandatory.
Roth conversions in lower-income retirement years reduce the traditional IRA balance that eventually generates RMDs. A smaller RMD means less income sitting on top of Social Security later. Conversions also let you lock in today’s rates on amounts that would otherwise be taxed at whatever rates apply when distributions are forced.
Tax-loss harvesting in taxable accounts reduces future capital gain exposure. Gains that don’t appear on the return don’t interact with the Social Security combined income threshold or the Net Investment Income surtax.
Withdrawal sequencing matters more than most people realize. Which account type you pull from in a given year determines your effective tax rate. Pulling $50,000 from a Roth has no income tax consequence. Pulling $50,000 from a traditional IRA does. Mixing sources intentionally can keep annual taxable income below thresholds that would otherwise be crossed. Done consistently over a 20-year retirement, the difference compounds.
None of this eliminates the problem for everyone. Tax laws change, income needs shift, and markets don’t cooperate on schedule. But running the math before 65, not after 73, is the difference between having options and working with whatever the balances and the rules dictate.
If you want to see where your retirement tax rate is likely to land, schedule a no-obligation call with Jeff. Bring a sense of what you have saved and where it’s held. That’s enough to start.
The information provided is for educational purposes only and should not be construed as investment advice. Investment strategies should be tailored to individual circumstances, risk tolerance, and goals. Past performance doesn’t guarantee future results. Consult with qualified financial professionals regarding your specific situation. Securities offered through LPL Financial, Member FINRA/SIPC. Investment advice offered through Great Valley Advisor Group, a registered investment advisor and separate entity from LPL Financial. © 2026 JeffJudgeCFP.com | Not to be reproduced in whole or in part. All rights reserved.