Roth vs Traditional 401(k) at 45 on $100k income? (single)

Rosa, 45, in Minneapolis, MN

example

Single, no kids · $100k/yr household income

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

45, 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

Household income

$100,000/yr

Household

Single earner

Liquid savings

$84,000

Retirement savings

$252,000

Investing return

7%/yr

SHIFT

Lean Traditional, your 22% rate drops to ~5% in retirement

22% → 5%

Rate drops 17% in retirement

Projected net worth

Today: $408k$11M projected

Rate Now

22%

Rate Retired

Best Strategy

All Trad

NW Diff

+$147k

Your current effective rate of ~22% (engine-computed) drops to ~5% in retirement. Traditional saves taxes now when your rate is highest. The All Trad strategy produces +$147k more at retirement.

Scenario	Strategy	Retire NW	Lifetime Taxes	Retire SWR/mo	Coverage
All Trad	100% Traditional	$3,762,717 ($2.1M in today's dollars)	$1.8M	$12,542	25 yrs
Current	Current mix	$3,615,383 ($2.0M in today's dollars)	$1.5M	$12,051	25 yrs
50/50	50/50 Split	$3,617,451 ($2.0M in today's dollars)	$1.5M	$12,058	25 yrs
Roth 70%	Tilt Roth (70%)	$3,527,053 ($2.0M in today's dollars)	$1.4M	$11,757	25 yrs
All Roth	100% Roth	$3,446,052 ($1.9M in today's dollars)	$1.3M	$11,487	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 $100k at 45?

Lean Traditional, your 22% rate drops to ~5% in retirement

Rate drops 17% in retirement

22% → 5%, 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.