Where Tax Rates Stand Today - and Where They Have Been
The Tax Cuts and Jobs Act of 2017 lowered individual income tax rates substantially. In 2026, married filers pay 12% on income up to $100,800, 22% on income up to $211,400, and 24% on income up to $403,550 before reaching the 32% bracket. These rates feel normal because they have been in place since 2018. But in historical perspective, they are among the lowest in nearly a century of federal income taxation. The top marginal rate in the United States was 94% during World War II. It was 70% as recently as 1980 - during the Carter administration. It was 50% in 1986, before the Tax Reform Act reduced it to 28%. It rose again in 1993 to 39.6%, then fell to 35% and 33% during the Bush-era tax cuts, then fluctuated before the Tax Cuts and Jobs Act set the current 37% rate. The relevance for retirement planning is direct. If you are contributing to a traditional 401(k) today at a 22% or 24% marginal rate, you are deferring tax in one of the lowest-rate environments of the past 80 years. The bet embedded in that deferral is that your future withdrawal rate will be lower than today's 22-24%. Given the historical trajectory of federal tax rates and the fiscal pressures building in the U.S. budget, that bet deserves scrutiny. For those in the 32% and higher brackets today, the calculation is even more pointed. Deferring income at 32% and withdrawing at 32% in retirement produces no tax benefit from deferral - the tax is simply postponed, not reduced. If rates rise during the deferral period, the bet actively backfires.
Key Stat: The current 37% top marginal federal income tax rate is the lowest since 1987. For most of the 20th century, the top rate exceeded 50%, and it exceeded 70% from 1936 through 1980.
The TCJA Sunset: Rates Were Already Scheduled to Rise
The Tax Cuts and Jobs Act of 2017 contained a critical structural feature: the individual income tax changes were temporary. Under the original legislation, the lower rates and expanded brackets were set to expire after 2025, reverting to pre-TCJA levels. The One Big Beautiful Bill enacted in 2025 extended and modified some provisions, adjusting the 10% and 12% brackets with an additional 4% inflation adjustment. But the broader landscape of uncertainty around future rates remains. For context, the pre-TCJA brackets at similar income levels were higher. The 25% bracket covered income up to roughly $153,100 for married filers in 2017 - the same income range that falls in the 22% bracket today. The 28% bracket covered income up to $233,350 for married filers in 2017 versus the current 24% bracket covering up to $403,550. For a retiree planning to withdraw $150,000 per year from a traditional IRA starting in 10 years, the question is not just what their tax rate will be at that income level - it is what tax rates will exist at that income level in 10-20 years. Even a relatively modest rate increase of 2-3 percentage points on $100,000 of annual withdrawals over 20 years of retirement costs an additional $40,000 to $60,000 in total tax over the retirement period. For higher earners with larger projected distributions, the exposure is proportionally greater.
The National Debt and Entitlement Obligations: Structural Pressure on Future Rates
Setting aside any political analysis, the fiscal mathematics of the U.S. federal budget present a compelling structural case for higher future tax revenues. The national debt has exceeded $36 trillion. Annual interest payments on that debt have surpassed $1 trillion per year for the first time in history - a recurring cost that did not exist at anything close to this scale even five years ago. As existing debt rolls over at higher interest rates than the historically low rates of 2010-2021, the interest burden increases further regardless of new spending decisions. The Social Security and Medicare trust funds face actuarially documented insolvency within the next decade. The 2024 Social Security Trustees Report projected trust fund depletion around 2033-2035. At that point, incoming payroll taxes would cover only approximately 77% of scheduled benefits - meaning either benefit cuts or additional revenue are required. Medicare faces similar structural funding pressures. The Congressional Budget Office's long-term projections consistently show federal debt rising as a share of GDP under current policy. The only lever that can reduce that trajectory without spending cuts is increased revenue - which means, at some point, higher taxes. This does not mean rates will necessarily rise to 1960s levels. It does mean the fiscal environment makes some form of increased revenue collection - whether through higher rates, eliminated deductions, or expanded taxable income - more likely over the coming 20 to 30 years than the historical average. A 55-year-old today who plans to draw retirement income from age 65 to age 85 is planning across a period when that fiscal pressure will be most acute.
What Tax Rate Uncertainty Means for Your Retirement Plan
The appropriate response to tax rate uncertainty is not to avoid all tax-deferred savings. Employer matching contributions to a traditional 401(k) remain among the highest guaranteed returns available - a 50% match is a 50% instant return regardless of future tax rates. Take the match. But beyond the match, the case for tax diversification - building balances in both tax-deferred and tax-free accounts simultaneously - grows stronger the more seriously you take the possibility of higher future rates. A portfolio that includes both traditional 401(k) or IRA assets and Roth assets gives you distribution flexibility in retirement. In years when tax rates are lower, draw from the traditional accounts. In years when rates are higher, or when a large distribution would push you into a higher bracket, draw from Roth accounts instead. The ability to blend income sources to manage your effective tax rate is the core value of tax diversification. Roth conversions during the pre-RMD window - between retirement and age 73 - are particularly valuable precisely because you are converting at today's known rates rather than gambling on tomorrow's unknown rates. Paying 22% today on a conversion to eliminate future taxes that might be 24%, 28%, or higher is a defensible hedge against rate uncertainty. The Roth conversion ladder strategy provides a systematic framework for this approach: convert just enough each year to fill your current bracket without crossing into the next tier, and avoid triggering IRMAA surcharges. Executed consistently over five to ten years, this approach can meaningfully reduce the proportion of your retirement income that is subject to future rate uncertainty.
Want to see how a tax-free retirement strategy would work in your situation? Explore your options here.