We're in our 40s with a healthy portfolio: how a $1.3 million tax bomb forced us to act before retirement

"When we actually forecasted their income tax situation out into retirement, once they hit required minimum distribution age at 75, a tax bomb blew up in them. When they were so used to being in the 12% marginal tax bracket. Now all of a sudden they blow up into the 32% marginal tax bracket later on in life."

"Traditional 401(k) and IRA balances are pre-tax. Every dollar you withdraw is taxed as ordinary income. At age 75, the IRS forces you to begin Required Minimum Distributions whether you need the cash or not. The RMD divisor at 75 is roughly 24.6, meaning you must pull out about 4% of your balance that year, with the percentage rising annually."

"Run a realistic scenario. A couple, both 45, has $1.5 million in a traditional 401(k). Assume a 7% annual return and continued contributions. By age 75 that balance can plausibly reach $6 million to $8 million. A first-year RMD on $7 million is roughly $285,000, on top of Social Security and any pension or dividend income. That stacks a couple who lived comfortably in the 12% federal bracket into the 32% bracket."

"By executing strategic Roth conversions between retirement and the start of RMDs, the couple could end up with almost $3.5 million more in assets and pay almost $1.3 million less in taxes. That is the stakes-setter. If you are in your 40s with seven figures already in a traditional 401(k), the IRS is a silent partner whose share grows every year you ignore it."

Traditional 401(k) and IRA balances are pre-tax, so withdrawals are taxed as ordinary income. Required Minimum Distributions begin at age 75, regardless of whether cash is needed, and the required percentage increases each year. A realistic forecast can show that savers who spent years in a lower marginal tax bracket may later face much higher marginal rates once RMDs start. For example, a couple with a large traditional balance can generate first-year RMDs around hundreds of thousands of dollars, stacking with Social Security, pensions, and other income. Roth conversions between retirement and the start of RMDs can shift income into earlier years, potentially increasing assets and lowering taxes.

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