Roth vs Traditional 401(k) on $300k income? (married)
Nina & Leah, 35 and 37, 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.
35, 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
35
Household income
$300,000/yr
Household
Married, dual income
Liquid savings
$132,000
Retirement savings
$396,000
Investing return
7%/yr
Lean Traditional, your 26% rate drops to ~7% in retirement
26% → 7%
Rate drops 19% in retirement
Rate Now
26%
Rate Retired
7%
Best Strategy
All Trad
NW Diff
+$267k
Your current effective rate of ~26% (engine-computed) drops to ~7% in retirement. Traditional saves taxes now when your rate is highest. The All Trad strategy produces +$267k more at retirement.
| Scenario | Strategy | Retire NW | Lifetime Taxes | Retire SWR/mo | Coverage |
|---|---|---|---|---|---|
| All Trad | 100% Traditional | $10,157,986 ($4.2M in today's dollars) | $7.8M | $33,860 | 25 yrs |
| Current | Current mix | $9,891,017 ($4.1M in today's dollars) | $7.2M | $32,970 | 25 yrs |
| 50/50 | 50/50 Split | $9,538,469 ($3.9M in today's dollars) | $6.6M | $31,795 | 7 yrs |
| Roth 70% | Tilt Roth (70%) | $9,221,529 ($3.8M in today's dollars) | $6.3M | $30,738 | 5 yrs |
| All Roth | 100% Roth | $8,935,150 ($3.7M in today's dollars) | $6.5M | $29,784 | 4 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?
Lean Traditional, your 26% rate drops to ~7% in retirement
Rate drops 19% in retirement
26% → 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.