Roth vs Traditional 401(k) on $75k income? (single)
Devin, 35, in Kansas City, MO
exampleSingle, no kids · $75k/yr household income
They're maxing their 401(k) in Kansas City and unsure whether Roth or traditional is quietly costing them.
Devin is maxing their 401(k) in Kansas City and paying a 19% effective rate today to avoid a 4% rate in retirement. That's the wrong trade, and the $352k difference says so clearly.
The setup
Age
35
Household income
$75,000/yr
Household
Single earner
Liquid savings
$33,000
Retirement savings
$99,000
Investing return
7%/yr
Lean Traditional, your 19% rate drops to ~4% in retirement
19% → 4%
Rate drops 15% in retirement
Rate Now
19%
Rate Retired
4%
Best Strategy
All Trad
NW Diff
+$352k
The math here is unusually lopsided. Devin's effective rate in retirement is projected at just 4%, versus 19% today, so every dollar sheltered in a Traditional 401(k) now gets deducted at the higher rate and withdrawn at the lower one. That 15-point spread, held over decades, is what compounds into a $352k net worth difference between going all-Traditional versus Roth.
Your current effective rate of ~19% (engine-computed) drops to ~4% in retirement. Traditional saves taxes now when your rate is highest. The All Trad strategy produces +$352k more at retirement.
| Scenario | Strategy | Retire NW | Lifetime Taxes | Retire SWR/mo | Coverage |
|---|---|---|---|---|---|
| All Trad | 100% Traditional | $5,116,119 ($2.1M in today's dollars) | $2.9M | $17,054 | 25 yrs |
| Current | Current mix | $4,764,075 ($2.0M in today's dollars) | $2.0M | $15,880 | 25 yrs |
| 50/50 | 50/50 Split | $4,813,499 ($2.0M in today's dollars) | $2.1M | $16,045 | 25 yrs |
| Roth 70% | Tilt Roth (70%) | $4,612,053 ($1.9M in today's dollars) | $1.7M | $15,374 | 25 yrs |
| All Roth | 100% Roth | $4,458,666 ($1.8M in today's dollars) | $1.5M | $14,862 | 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 own rate spread is probably different from Devin's, so model your actual numbers and see what the gap really is.
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Get my verdict →Frequently asked
Roth or traditional 401(k) for a single household earning $75k?
Lean Traditional, your 19% rate drops to ~4% in retirement
Rate drops 15% in retirement
19% → 4%, 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.