Roth vs Traditional 401(k) on $150k income? (married)
Most married couples earning $150k default to Roth because it feels safer — but for you, that instinct is quietly costing a fortune.
The setup
Age
35
Household income
$150,000/yr
Household
Married, dual income
Liquid savings
$66,000
Retirement savings
$198,000
Investing return
7%/yr
Lean Traditional — your 20% rate drops to ~16% in retirement
20% → 16%
Rate drops 4% in retirement
Rate Now
20%
Rate Retired
16%
Best Strategy
All Trad
NW Diff
+$423k
The math is blunt: you're paying a 20% marginal rate today, and the engine projects you'll draw down at roughly 16% in retirement — that 4-point spread, compounded across decades, translates to a $423k net-worth difference in favor of Traditional. Parking $66k in liquid savings and $198k in retirement accounts means you already have meaningful assets working, which makes the tax-deferral arbitrage even more valuable right now.
Your current effective rate of ~20% (engine-computed) drops to ~16% in retirement. Traditional saves taxes now when your rate is highest. The All Trad strategy produces +$423k more at retirement.
| Scenario | Strategy | Retire NW | Lifetime Taxes | Retire SWR/mo | Coverage |
|---|---|---|---|---|---|
| All Trad | 100% Traditional | $10,925,683 ($4.5M in today's dollars) | $4.9M | $36,419 | 25 yrs |
| Current | Current mix | $10,502,371 ($4.3M in today's dollars) | $4.1M | $35,008 | 25 yrs |
| 50/50 | 50/50 Split | $10,621,245 ($4.4M in today's dollars) | $4.1M | $35,404 | 25 yrs |
| Roth 70% | Tilt Roth (70%) | $10,425,204 ($4.3M in today's dollars) | $3.6M | $34,751 | 25 yrs |
| All Roth | 100% Roth | $10,246,785 ($4.2M in today's dollars) | $3.3M | $34,156 | 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.
Plug in your actual contribution rate and see exactly how many years it takes for that $423k gap to show up in your balance — the answer might surprise you.
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Get my verdict →Frequently asked
Roth or traditional 401(k) for a married household earning $150k?
Lean Traditional — your 20% rate drops to ~16% in retirement
Rate drops 4% in retirement
20% → 16% — 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.