Roth vs Traditional 401(k) at 30 on $300k income? (single)

Chris, 30, in Boston, MA

example

Single, no kids · $300k/yr household income

They're maxing their 401(k) in Boston and unsure whether Roth or traditional is quietly costing them.

30, single, $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

Household income

$300,000/yr

Household

Single earner

Liquid savings

$72,000

Retirement savings

$216,000

Investing return

7%/yr

SHIFT

Lean Traditional, your 30% rate drops to ~23% in retirement

30% → 23%

Rate drops 7% in retirement

Projected net worth

Today: $470k$115M projected

Rate Now

30%

Rate Retired

23%

Best Strategy

All Trad

NW Diff

+$570k

Your current effective rate of ~30% (engine-computed) drops to ~23% in retirement. Traditional saves taxes now when your rate is highest. The All Trad strategy produces +$570k more at retirement.

Scenario	Strategy	Retire NW	Lifetime Taxes	Retire SWR/mo	Coverage
All Trad	100% Traditional	$31,757,747 ($11M in today's dollars)	$15M	$105,859	25 yrs
Current	Current mix	$31,187,968 ($11M in today's dollars)	$15M	$103,960	25 yrs
50/50	50/50 Split	$30,831,152 ($11M in today's dollars)	$14M	$102,771	25 yrs
Roth 70%	Tilt Roth (70%)	$30,336,023 ($11M in today's dollars)	$13M	$101,120	25 yrs
All Roth	100% Roth	$29,902,661 ($11M in today's dollars)	$12M	$99,676	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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Frequently asked

Roth or traditional 401(k) for a single household earning $300k at 30?

Lean Traditional, your 30% rate drops to ~23% in retirement

Rate drops 7% in retirement

30% → 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.