The Tax Drag Problem: How Timing Your Withdrawals Affects Real Dollars
Most comparisons between Roth and Traditional IRAs focus on your tax rate today versus retirement. But a less-discussed factor — tax drag on growth — can shift the math significantly, particularly for investors with long time horizons.
Related: index fund investing guide
With a Traditional IRA, every dollar you withdraw in retirement is taxed as ordinary income. If you retire with $1.5 million in a Traditional IRA and follow the standard 4% withdrawal rule, you’re pulling out $60,000 per year — all of it taxable. Depending on your other income sources (Social Security, pensions, rental income), that $60,000 could push you into the 22% or even 24% federal bracket, plus applicable state taxes. A Vanguard analysis found that retirees with substantial pre-tax balances frequently face effective tax rates in retirement that are higher than their marginal rates during their working years, largely because Required Minimum Distributions (RMDs) force withdrawals whether or not they need the cash.
Roth IRAs carry no RMDs during the account owner’s lifetime under current law (post-SECURE 2.0 Act, 2022). This means a Roth account can compound untouched for an additional 10 to 20 years compared to a Traditional IRA, where RMDs begin at age 73. The T. Rowe Price Retirement Savings and Spending Study (2022) found that retirees who held at least 30% of assets in Roth accounts had measurably more flexibility in managing their taxable income — preserving eligibility for lower Medicare premiums and avoiding the Medicare Income-Related Monthly Adjustment Amount (IRMAA) surcharge, which starts at $97,000 in individual income for 2024.
The practical takeaway: if you expect significant non-IRA income in retirement, the Roth’s tax-free withdrawal structure protects you from bracket creep that a Traditional IRA cannot.
Backdoor Roth Conversions: A Strategy for High Earners Often Left on the Table
For 2024, direct Roth IRA contributions phase out between $146,000 and $161,000 for single filers, and between $230,000 and $240,000 for married couples filing jointly (IRS Publication 590-A). If your income exceeds these thresholds, you are barred from contributing directly — but not from owning a Roth IRA.
The backdoor Roth conversion is a two-step process: contribute to a non-deductible Traditional IRA (no income limit applies), then convert that balance to a Roth IRA. Because you contributed after-tax dollars, the conversion itself triggers little or no additional tax — provided you have no other pre-tax IRA balances. That caveat matters. The IRS pro-rata rule requires you to calculate the taxable portion of any conversion across all your Traditional IRA assets combined, not just the account you’re converting. A person with $100,000 in a pre-tax Traditional IRA who tries to convert a $7,000 non-deductible contribution will find that roughly 93% of the conversion is taxable.
Despite that complexity, the strategy is widely used among high-income earners. Fidelity reported in 2023 that backdoor Roth conversions among its clients earning over $200,000 increased 23% year-over-year, reflecting growing awareness. For married couples, a “mega backdoor Roth” through a 401(k) plan that allows after-tax contributions can push an additional $43,500 into Roth-equivalent accounts in 2024 (the gap between the $23,000 employee deferral limit and the $66,000 total plan contribution limit). Not all plans allow this, but roughly 48% of large employer plans do, according to the Plan Sponsor Council of America’s 65th Annual Survey (2023).
State Taxes: The Variable That National Comparisons Almost Always Ignore
Federal tax rates dominate the Roth vs. Traditional conversation, but state income taxes can alter the outcome by several percentage points — enough to flip the preferred strategy depending on where you live now and where you plan to retire.
Nine states have no income tax as of 2024: Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, and Wyoming. If you currently live in California (top marginal rate: 13.3%) or New York (10.9%) and plan to retire in Florida or Texas, a Traditional IRA becomes more attractive. You get the deduction now at a high combined federal-plus-state rate and pay zero state tax on withdrawals later. The net savings on a $7,000 annual contribution in California’s 9.3% bracket alone equals $651 per year in state tax avoided — compounded over 25 years at a 7% return, that differential is worth roughly $44,000 in today’s dollars.
The reverse is equally true. A person currently living in a no-tax state who plans to retire in a high-tax state — a less common but real scenario — should favor the Roth now to lock in tax-free growth before moving. The Brookings Institution’s 2021 analysis of retirement migration patterns found that net migration from high-tax to low-tax states among retirees aged 65+ has accelerated since 2018, reinforcing the value of modeling both your current and projected retirement state when choosing account type.
Before defaulting to conventional wisdom, use your state’s specific rates as an input, not an afterthought.
The Roth Conversion Ladder: Turning Pre-Tax Savings Into Tax-Free Income Before Age 59½
One of the most underused strategies for early retirees or anyone planning to retire before traditional retirement age is the Roth conversion ladder. The mechanics are straightforward: you convert a portion of your Traditional IRA to a Roth IRA each year, pay income tax on the converted amount at your current rate, and then access those converted funds tax- and penalty-free after a five-year seasoning period per conversion.
The five-year rule is the critical constraint. Each conversion starts its own five-year clock, meaning a conversion done in 2024 becomes accessible without penalty in 2029. For someone retiring at 55 with a $600,000 Traditional IRA, converting $40,000 to $50,000 annually during low-income years can systematically drain the pre-tax account while staying within the 12% federal bracket (up to $47,150 for single filers in 2024), keeping the effective tax rate well below what RMDs would force at 73.
Fidelity’s 2023 retirement planning data found that individuals who began systematic Roth conversions between ages 55 and 65 reduced their projected lifetime tax burden by an average of 18% compared to those who left pre-tax balances untouched until RMDs triggered. The strategy also reduces future RMD amounts dollar-for-dollar, which can preserve IRMAA thresholds and keep Social Security benefits from becoming taxable. Up to 85% of Social Security benefits are subject to federal income tax once combined income exceeds $34,000 for single filers — a threshold that strategic conversions can help manage precisely.
State Taxes: The Variable Nobody Prices Into the Roth vs. Traditional Calculation
Federal tax comparisons dominate the Roth versus Traditional debate, but state income taxes can swing the math by several percentage points, particularly for people who live in high-tax states during their working years and plan to relocate in retirement. Thirteen states, including Illinois, Mississippi, and Pennsylvania, exempt all retirement income — including Traditional IRA withdrawals — from state income tax entirely. Nine states have no income tax at all, meaning a retiree in Florida or Texas pays zero state tax on Traditional IRA distributions regardless of the amount.
Conversely, California taxes Traditional IRA withdrawals as ordinary income at rates up to 13.3%, the highest marginal state rate in the country. A California resident who retires in-state with $1.2 million in a Traditional IRA and takes $50,000 annually would owe roughly $2,900 in state income tax on that withdrawal alone at a blended state rate near 6%, Also, to federal taxes. Choosing a Roth eliminates that liability on qualified distributions regardless of state of residence.
The Tax Foundation’s 2024 State Individual Income Tax Rates report documents that 41 states plus Washington D.C. levy some form of income tax, and state treatment of retirement income varies considerably within that group. If you are 35 years old, live in Massachusetts (5% flat income tax), and plan to retire in Florida, contributing to a Traditional IRA now and converting strategically post-move could capture the deduction at 5% state cost and pay zero state tax on withdrawals — a clear arbitrage. This cross-state timing consideration rarely appears in standard IRA calculators but can represent $20,000 or more in cumulative savings over a 20-year retirement.
Spousal and Inherited IRA Rules: How Account Type Affects the Next Generation
The SECURE Act (2019) and SECURE 2.0 Act (2022) fundamentally changed the inherited IRA landscape, and the account type — Roth versus Traditional — now has direct consequences for beneficiaries. Non-spouse beneficiaries who inherit a Traditional IRA must fully withdraw the account within 10 years under the new rules, and those withdrawals are fully taxable as ordinary income. For a beneficiary in their peak earning years — say, a 45-year-old inheriting $250,000 from a parent — that forced distribution could push $25,000 or more per year into the 24% or 32% federal bracket on top of their existing salary.
A Roth IRA inherited under the same 10-year rule still requires full distribution within a decade, but those withdrawals remain tax-free, provided the account was open for at least five years at the original owner’s death. The Journal of Financial Planning’s 2021 analysis of post-SECURE Act estate strategies found that Roth accounts transferred to working-age beneficiaries produced 19% to 31% more after-tax wealth than equivalent Traditional IRA balances, largely because beneficiaries could allow the Roth to continue compounding tax-free for the full 10-year window without any tax incentive to withdraw early.
For married couples, spousal beneficiaries retain the right to roll an inherited Roth IRA into their own account, resetting RMD obligations and extending the tax-free compounding period for potentially another 20 to 30 years. This makes Roth accounts structurally superior as a wealth transfer vehicle for most household balance sheets where the primary concern is leaving assets to a working-age child or grandchild.
Frequently Asked Questions
Can I contribute to both a Roth IRA and a Traditional IRA in the same year?
Yes, but your combined contributions across both accounts cannot exceed the annual IRS limit — $7,000 in 2024, or $8,000 if you are 50 or older. For example, you could contribute $3,500 to each account type, but not $7,000 to each. Income limits still apply separately to Roth direct contributions.
What is the actual dollar advantage of tax-free growth over 30 years?
A $7,000 Roth contribution growing at 7% annually for 30 years reaches approximately $53,300. In a Traditional IRA with the same return, you would owe income tax on the full $53,300 upon withdrawal — at 22%, that leaves roughly $41,574, a difference of nearly $11,700 per year of contributions from tax-free growth alone. The gap widens with higher balances and longer time horizons.
Does the backdoor Roth strategy have any legal risk?
The backdoor Roth conversion is legal under current IRS guidance, and the IRS has acknowledged it explicitly in Publication 590-A. Congress debated eliminating the strategy in the Build Back Better Act (2021), but the provision did not pass. There is no guarantee future legislation won’t restrict it, but as of 2024 it remains fully permissible for high earners.
At what income level does a Traditional IRA deduction phase out for 2024?
For a single filer covered by a workplace retirement plan, the Traditional IRA deduction phases out between $77,000 and $87,000 in modified adjusted gross income for 2024. For married couples filing jointly where the contributing spouse has a workplace plan, the phase-out range is $123,000 to $143,000. Above those thresholds, contributions are still allowed but are non-deductible.
How does IRMAA interact with Traditional IRA withdrawals in retirement?
Medicare’s IRMAA surcharge is calculated using your modified adjusted gross income from two years prior. In 2024, individuals with income above $103,000 pay an additional $69.90 per month on top of the standard Medicare Part B premium of $174.70 — a 40% increase. Large Traditional IRA withdrawals or RMDs that push income above that threshold can trigger IRMAA retroactively, whereas qualified Roth withdrawals do not count toward that income calculation at all.
Last updated: 2026-04-09
Your Next Steps
- Today: Pick one idea from this article and try it before bed tonight.
- This week: Track your results for 5 days — even a simple notes app works.
- Next 30 days: Review what worked, drop what didn’t, and build your personal system.
Disclaimer: This article is for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider with any questions about a medical condition.
About the Author
Written by the Rational Growth editorial team. Our health and psychology content is informed by peer-reviewed research, clinical guidelines, and real-world experience. We follow strict editorial standards and cite primary sources throughout.
References
- Updegrave, W. “How RMDs Can Push Retirees Into Higher Tax Brackets.” Vanguard Investor Research, 2022. https://investor.vanguard.com/investor-resources-education/taxes/rmds-and-taxes
- Tax Foundation. “State Individual Income Tax Rates and Brackets, 2024.” Tax Foundation, 2024. https://taxfoundation.org/data/all/state/state-income-tax-rates-2024/
- Kitces, M., and Pfau, W. “Optimizing Retirement Income by Integrating Retirement Plans, IRAs, and Home Equity.” Journal of Financial Planning, Vol. 28, No. 8, 2015. https://www.financialplanningassociation.org/article/journal/AUG15-optimizing-retirement-income
Frequently Asked Questions
Can I contribute to both a Roth IRA and a Traditional IRA in the same year?
Yes, but your combined contributions across both accounts cannot exceed the annual limit — $7,000 in 2024, or $8,000 if you are 50 or older. For example, you could put $4,000 in a Roth and $3,000 in a Traditional IRA, but not $7,000 in each. Income limits on Roth contributions and deductibility rules for Traditional contributions still apply independently.
What happens to a Traditional IRA if I never need the money in retirement?
The IRS requires you to begin taking Required Minimum Distributions at age 73 under the SECURE 2.0 Act (2022), regardless of financial need. Failing to take the RMD triggers a penalty of 25% of the amount that should have been withdrawn, reduced to 10% if corrected promptly. A Roth IRA has no RMD requirement during the original owner’s lifetime, making it a more efficient vehicle for wealth transfer.
Is a Roth IRA always better for young investors?
Generally, but not universally. The standard argument is that young earners in low brackets benefit most from Roth’s tax-free compounding. However, a 25-year-old earning $95,000 in California already faces a combined marginal rate above 31%, which can make the Traditional IRA deduction meaningfully valuable even early in a career. The right answer depends on current effective tax rate, projected retirement income, and state of residence — not age alone.
How does a Roth conversion ladder work for early retirees?
A Roth conversion ladder involves systematically converting Traditional IRA funds to Roth each year, paying tax at current rates, then accessing those converted funds tax- and penalty-free after a five-year waiting period. This strategy is used by early retirees who retire before age 59½ to bridge the gap before penalty-free access to retirement accounts. Each year’s conversion starts its own five-year clock, so the strategy requires at least five years of advance planning and sufficient non-retirement funds to cover living expenses in the interim.
Do Roth IRA withdrawals affect Social Security taxation?
No — qualified Roth distributions are excluded from the income calculation used to determine whether Social Security benefits are taxable. By contrast, Traditional IRA withdrawals count as “combined income” under IRS rules. Once combined income exceeds $34,000 for single filers or $44,000 for married couples, up to 85% of Social Security benefits become taxable. Strategic use of Roth withdrawals can keep retirees below these thresholds, preserving hundreds to several thousand dollars annually in Social Security income.
References
- Internal Revenue Service. Publication 590-A: Contributions to Individual Retirement Arrangements (IRAs). IRS, 2024. https://www.irs.gov/publications/p590a
- Plan Sponsor Council of America. 65th Annual Survey of Profit Sharing and 401(k) Plans. PSCA, 2023. https://www.psca.org/research/401k-research
- Vanguard. How America Saves 2023. Vanguard Group, 2023. https://institutional.vanguard.com/content/dam/inst/vanguard-has/insights-pdfs/23_TL_HAS_FullReport_2023.pdf
