Roth vs Traditional 401(k) at 30 on $300k income? (married)
Nina & Jordan, 30 and 32, in Boston, MA
exampleMarried, no kids yet · $300k/yr household income
They're maxing their 401(k) in Boston and unsure whether Roth or traditional is quietly costing them.
30, married, $300k/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
$300,000/yr
Household
Married, dual income
Liquid savings
$72,000
Retirement savings
$216,000
Investing return
7%/yr
Lean Traditional, your 23% rate drops to ~23% in retirement
23% → 23%
Rate drops 0% in retirement
Rate Now
23%
Rate Retired
23%
Best Strategy
All Trad
NW Diff
+$482k
Your current effective rate of ~23% (engine-computed) drops to ~23% in retirement. Traditional saves taxes now when your rate is highest. The All Trad strategy produces +$482k more at retirement.
| Scenario | Strategy | Retire NW | Lifetime Taxes | Retire SWR/mo | Coverage |
|---|---|---|---|---|---|
| All Trad | 100% Traditional | $32,617,110 ($12M in today's dollars) | $16M | $108,724 | 25 yrs |
| Current | Current mix | $32,134,813 ($11M in today's dollars) | $15M | $107,116 | 25 yrs |
| 50/50 | 50/50 Split | $31,880,248 ($11M in today's dollars) | $14M | $106,267 | 25 yrs |
| Roth 70% | Tilt Roth (70%) | $31,500,087 ($11M in today's dollars) | $13M | $105,000 | 25 yrs |
| All Roth | 100% Roth | $31,136,422 ($11M in today's dollars) | $12M | $103,788 | 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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Roth or traditional 401(k) for a married household earning $300k at 30?
Lean Traditional, your 23% rate drops to ~23% in retirement
Rate drops 0% in retirement
23% → 23%, 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.