A 72-Year-Old Couple With $900,000 in IRAs Converts Nothing. Their Kids Inherit the Tax Bill Instead.

A 72-year-old couple sitting on $900,000 in traditional IRAs has a decision most retirees quietly skip: whether to pay taxes now, at rates they can predict, or hand the bill to their children later, at rates no one can. The couple who does nothing is making an active choice: to move a large, unrealized tax liability onto the next generation, and under current law, that liability comes due on a compressed schedule most heirs are not prepared for.

Start with where the couple stands in 2026. If Social Security and a modest pension keep their taxable income under $100,800, every dollar of ordinary income sits inside the 12% bracket for married couples filing jointly. The 22% bracket runs from $100,801 to $211,400, and the 24% bracket extends to $403,550. Layer in the $32,200 standard deduction for married filers, and there is usually meaningful room to convert traditional IRA dollars into Roth dollars at 12%, 22%, or 24% before the couple bumps into a higher rate.

The Math of Doing Nothing

At 72, required minimum distributions are close but not immediate. SECURE 2.0 pushed the RMD start age to 73 for most current retirees. That gives this couple a narrow window where their income is often at its lifetime low, before RMDs stack on top of Social Security and pension income and start pushing them into the 22% and 24% brackets involuntarily. A 2.8% Social Security COLA in 2026 also nudges taxable income higher, since more of the benefit becomes taxable as combined income rises.

The couple who convert nothing keeps that pre-RMD window closed. The IRA continues to grow tax-deferred, which sounds attractive until the balance is viewed as what it actually is: a partnership with the IRS in which the government’s share is set by whatever tax rates apply when the money comes out. The larger the balance grows, the larger the government’s stake.

What the Heirs Actually Inherit

When both spouses die, non-spouse beneficiaries, typically the children, inherit under the SECURE Act’s 10-year rule. The full balance must be distributed within a decade. For adult children in their peak earning years, that means layering IRA distributions on top of salaries that already sit in the 24%, 32%, or 35% brackets. The 32% bracket for married couples starts at $403,550, and 35% begins at $512,450. A child earning $250,000 who inherits a share of the $900,000 balance can easily see the marginal rate on those distributions land at 32% or higher.

The couple avoided paying 22% or 24% on conversions during their sixties and early seventies. Their children pay 32% or 35% during their forties and fifties. The tax bill moved, and it grew.

Why 2026 Is a Practical Window

Two macro data points frame the current opportunity. The federal funds target upper bound sits at 3.75% after 0.75 percentage-point cuts over the past year, and the 10-year Treasury yields 4.57%. Cash and short-duration bonds held outside a converted Roth can generate sufficient income to cover the conversion tax without tapping principal. On the inflation side, Core PCE has climbed from 126.43 in July 2025 to 130.08 in May 2026, quietly reducing the real purchasing power of every unconverted dollar.

The current bracket structure itself is temporary. The 37% top rate and the wide 22% and 24% bands were set by legislation that has already been extended once. Planning around today’s brackets is planning around a known quantity.

What to Do With the Window

Three moves fit most couples in this position. The first is to calculate how much room remains in the 22% or 24% bracket after Social Security, pension, and investment income, and convert up to that ceiling each year. The second is to front-load conversions before RMDs begin at 73, because once RMDs start, they consume bracket space that could otherwise be used for conversions. The third move is to coordinate with a tax professional on IRMAA thresholds, since Medicare premiums step up at defined income levels and a large conversion can trigger a two-year premium surcharge.

The couple who convert nothing may be correct on the arithmetic of any single year, yet miscalculate on the arithmetic of the estate. The $900,000 balance is a tax bill with a growth rate attached, and the SECURE Act’s 10-year rule decides who ultimately writes the check.

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