Roth vs Traditional 401(k) on $150k income? (married)
Tyler & Claire, 35 and 36, in Charlotte, NC
exampleMarried, no kids yet · $150k/yr household income
They're maxing their 401(k) in Charlotte and unsure whether Roth or traditional is quietly costing them.
Most married couples earning $150k assume Roth is the obvious move. Tyler & Claire are maxing their 401(k) in Charlotte, and the math says they're likely leaving $397k on the table by picking the wrong one.
The setup
Age
35
Household income
$150,000/yr
Household
Married, dual income
Liquid savings
$66,000
Retirement savings
$198,000
Investing return
7%/yr
Lean Traditional, your 20% rate drops to ~12% in retirement
20% → 12%
Rate drops 8% in retirement
Rate Now
20%
Rate Retired
12%
Best Strategy
All Trad
NW Diff
+$397k
The engine projects Tyler & Claire's effective tax rate dropping from 20% now to roughly 12% in retirement, an 8-point gap. Paying 20% today to avoid 12% later isn't a tax hedge, it's a tax penalty. Shifting entirely to Traditional captures that spread across every dollar they contribute between now and retirement, and the projected net worth difference is $397k.
Your current effective rate of ~20% (engine-computed) drops to ~12% in retirement. Traditional saves taxes now when your rate is highest. The All Trad strategy produces +$397k more at retirement.
| Scenario | Strategy | Retire NW | Lifetime Taxes | Retire SWR/mo | Coverage |
|---|---|---|---|---|---|
| All Trad | 100% Traditional | $11,403,965 ($4.7M in today's dollars) | $4.7M | $38,013 | 25 yrs |
| Current | Current mix | $11,006,933 ($4.5M in today's dollars) | $3.9M | $36,690 | 25 yrs |
| 50/50 | 50/50 Split | $11,044,096 ($4.6M in today's dollars) | $4.0M | $36,814 | 25 yrs |
| Roth 70% | Tilt Roth (70%) | $10,823,212 ($4.5M in today's dollars) | $3.5M | $36,077 | 25 yrs |
| All Roth | 100% Roth | $10,639,388 ($4.4M in today's dollars) | $3.2M | $35,465 | 25 yrs |
Tax laws change. Roth conversions, RMDs, and state tax changes can shift the calculus. This analysis uses current rates as a starting point.
Your rate spread could look nothing like theirs, so run your own numbers and find out which direction the math actually points.
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Roth or traditional 401(k) for a married household earning $150k?
Lean Traditional, your 20% rate drops to ~12% in retirement
Rate drops 8% in retirement
20% → 12%, modeled with Rightmont's projection engine for this exact scenario.
How was this calculated?
Rightmont runs your numbers through a year-by-year projection engine (taxes, compounding, Social Security, and your real cashflow) to model the outcome. Model your own version free in under a minute.
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For educational purposes only, not financial advice.