A 56-Year-Old Couple Discovers Their $3.6M Portfolio Is Hemorrhaging $24,000 a Year in Avoidable Taxes

A 56-year-old couple with $1.4 million in a traditional 401(k), $400,000 in a Roth IRA, and $1.2 million in a taxable brokerage holds identical 60% bond and 40% stock allocations across all accounts. Different account types tax returns differently: traditional 401(k) withdrawals are taxed as ordinary income, Roth growth is tax-free, and taxable accounts tax interest as ordinary income while taxing qualified dividends and long-term gains at preferential rates and allowing a step-up in basis at death. Holding bonds in the taxable brokerage creates significant annual taxable interest. With bond yields around 4.5%, where bonds generate meaningful income, asset location becomes more important. The optimized approach places bonds in the 401(k), broad equities in the brokerage, and growth-oriented assets in the Roth IRA.

"Each account type taxes returns differently. A traditional 401(k) defers tax on everything until withdrawal, then taxes it as ordinary income. A Roth pays nothing on growth, ever. A brokerage account taxes interest at ordinary rates as it accrues, but taxes qualified dividends and long-term gains at preferential rates, and gets a step-up in basis at death."

"When the same 60/40 mix sits in all three, the bonds in the brokerage are the worst offender. $720,000 in brokerage bonds yielding about 4% throws off $28,800 a year in taxable interest. At a 32% federal bracket plus 6% state, that interest costs $10,944 in tax annually, none of which would have been owed had those bonds been held inside the 401(k)."

"That 4% assumption reflects today's rate environment. The 10-year Treasury yield sits around 4.5%, sitting in the 93rd percentile of the past twelve months. Bond income is meaningful again, which makes where you hold those bonds matter more than it has in years."

"The optimized layout follows one rule: match each asset to the account that taxes it most lightly. Bonds go in the 401(k). Interest compounds tax-deferred. The ordinary-income treatment at withdrawal is irrelevant because bond interest would have been taxed at ordinary rates anyway. The shelter is free."

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