Roth vs Traditional 401(k) at 30 on $100k income? (married)

Aisha & Jordan, 30 and 30, in Minneapolis, MN

example

Married, no kids yet · $100k/yr household income

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

30, married, $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

Household income

$100,000/yr

Household

Married, dual income

Liquid savings

$24,000

Retirement savings

$72,000

Investing return

7%/yr

SHIFT

Lean Traditional, your 18% rate drops to ~12% in retirement

18% → 12%

Rate drops 6% in retirement

Projected net worth

Today: $143k$24M projected

Rate Now

18%

Rate Retired

12%

Best Strategy

All Trad

NW Diff

+$588k

Your current effective rate of ~18% (engine-computed) drops to ~12% in retirement. Traditional saves taxes now when your rate is highest. The All Trad strategy produces +$588k more at retirement.

Scenario	Strategy	Retire NW	Lifetime Taxes	Retire SWR/mo	Coverage
All Trad	100% Traditional	$8,585,150 ($3.1M in today's dollars)	$4.1M	$28,617	25 yrs
Current	Current mix	$7,996,833 ($2.8M in today's dollars)	$2.7M	$26,656	25 yrs
50/50	50/50 Split	$8,320,415 ($3.0M in today's dollars)	$3.2M	$27,735	25 yrs
Roth 70%	Tilt Roth (70%)	$8,134,803 ($2.9M in today's dollars)	$2.7M	$27,116	25 yrs
All Roth	100% Roth	$7,985,066 ($2.8M in today's dollars)	$2.4M	$26,617	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 married household earning $100k at 30?

Lean Traditional, your 18% rate drops to ~12% in retirement

Rate drops 6% in retirement

18% → 12%, 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.