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 faces 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 forecast. Choosing to do nothing is itself an active choice. It moves 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. The standard deduction for married filers is $32,200 in 2026, and taxpayers 65 and older can claim an additional $1,650 per qualifying spouse on top of that. Taken together, there is often meaningful room to convert traditional IRA dollars into Roth dollars at 12%, 22%, or 24% before the couple reaches 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 push them into higher 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 converts nothing keeps that pre-RMD window closed. The IRA continues to grow tax-deferred, which sounds attractive until the balance is understood for what it actually is: a partnership with the IRS in which the government’s share is determined 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. A critical update applies here: IRS final regulations, effective January 1, 2025, clarify that if the original IRA owner died after their required beginning date for RMDs, heirs must take annual distributions in years one through nine and fully empty the account by year ten. Because this couple will reach RMD age before they die, that stricter annual-withdrawal path is the one their children will most likely face.

For adult children in their peak earning years, layering IRA distributions on top of salaries that already sit in the 24%, 32%, or 35% brackets creates a compounding tax problem. 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 arithmetic is straightforward: the parents 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 points of cuts in late 2025, and the 10-year Treasury yields approximately 4.7% as of late August 2026, near its highest level since 2007. Cash and short-duration bonds held outside a converted Roth can generate enough 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 adds another layer of urgency. The One Big Beautiful Bill Act, signed into law on July 4, 2025, made the TCJA’s lower tax rates and wider brackets permanent, removing the sunset cliff that once loomed at the end of 2025. That permanence sounds reassuring, but it also confirms that today’s rates are the baseline, not a temporary discount. Congress can always revise the code in the future, and planning around the known is still preferable to betting on the unknown.

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, then 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 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 converts 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, now carrying a mandatory annual distribution requirement for most heirs, decides who ultimately writes the check.

Editor’s note: This article was updated to reflect the 10-year Treasury yield near 4.7% as of late August 2026, the One Big Beautiful Bill Act’s permanent extension of TCJA tax brackets (signed July 4, 2025), the additional $1,650 standard deduction available per qualifying spouse aged 65 or older, and the IRS final regulations (effective January 1, 2025) requiring annual RMDs from inherited IRAs in years one through nine when the original account owner died after their RMD start date.

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