Roth vs Traditional 401(k) at 30 on $100k income? (single)
Chris, 30, in Denver, CO
exampleSingle, no kids · $100k/yr household income
They're maxing their 401(k) in Denver and unsure whether Roth or traditional is quietly costing them.
30, single, $100k/yr. Roth or traditional 401(k)? "Always Roth" isn't always right at this income. Here's the lifetime-tax difference, modeled year by year.
The setup
Age
30
Household income
$100,000/yr
Household
Single earner
Liquid savings
$24,000
Retirement savings
$72,000
Investing return
7%/yr
Lean Traditional, your 22% rate drops to ~7% in retirement
22% → 7%
Rate drops 15% in retirement
Rate Now
22%
Rate Retired
7%
Best Strategy
All Trad
NW Diff
+$510k
Your current effective rate of ~22% (engine-computed) drops to ~7% in retirement. Traditional saves taxes now when your rate is highest. The All Trad strategy produces +$510k more at retirement.
| Scenario | Strategy | Retire NW | Lifetime Taxes | Retire SWR/mo | Coverage |
|---|---|---|---|---|---|
| All Trad | 100% Traditional | $10,362,371 ($3.7M in today's dollars) | $5.5M | $34,541 | 25 yrs |
| Current | Current mix | $9,852,671 ($3.5M in today's dollars) | $4.3M | $32,842 | 25 yrs |
| 50/50 | 50/50 Split | $9,746,026 ($3.5M in today's dollars) | $4.1M | $32,487 | 25 yrs |
| Roth 70% | Tilt Roth (70%) | $9,388,192 ($3.3M in today's dollars) | $3.3M | $31,294 | 25 yrs |
| All Roth | 100% Roth | $9,069,073 ($3.2M in today's dollars) | $2.7M | $30,230 | 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 real number depends on your savings, debts, and city. The averages above are a starting point. Model your exact situation and get your verdict.
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Get my verdict →Frequently asked
Roth or traditional 401(k) for a single household earning $100k at 30?
Lean Traditional, your 22% rate drops to ~7% in retirement
Rate drops 15% in retirement
22% → 7%, 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.