The 2030 Inherited IRA Tax Bomb — And How I Found It By Accident

I stumbled onto this problem while testing code.

I was implementing the RMD scheduling feature of WhenIm64, the part of the app that calculates required minimum distributions for each IRA account and surfaces them as an annual action item. I tested one case based on my wife's inherited IRA and it seemed simple enough. Her mother passed away in 2015, and since then my wife gets a small distribution check every January from the brokerage.

But when I added a second test case, another inherited IRA from someone who died in 2020, the model produced a number in 2030 that I had to read twice. I thought Claude Code had made a coding error. Claude insisted the data was correct.

I started researching. This is what I found:

A Tale of Two Rules

To understand what's coming, you need to know about a law that changed in 2020.

Before the SECURE Act of 2019, inheriting an IRA came with a powerful planning tool called the stretch IRA. If you inherited a traditional IRA from a parent, you could take distributions based on your own life expectancy, spreading the tax liability over decades. A 55-year-old who inherited a $300,000 IRA in 2015 might take small annual distributions over 30+ years, keeping each year's taxable income modest while the remaining balance compounded tax-deferred.

My wife's inherited IRA works exactly this way. Her mother died in 2015, before the SECURE Act. The distributions are calculated annually using the IRS Single Life Expectancy table, the factor decrements by 1.0 each year, and the account gradually depletes over her remaining life expectancy. Predictable, manageable, no surprises.

The SECURE Act ended this for most people. For IRAs inherited from people who died on or after January 1, 2020, most non-spouse beneficiaries now face a hard deadline: the entire inherited IRA must be withdrawn by December 31 of the tenth year after the original owner's death.

Congress sold this as a revenue acceleration measure. The policy argument was reasonable. The execution created something Congress and the IRS apparently didn't model carefully together: a structural time bomb embedded in the math.

The Math Nobody Explained

If the original owner had not yet started taking RMDs when they died, there are no annual distributions required from the inherited account. You just have to empty it and pay taxes within 10 years. If the original owner was already taking RMDs, the IRS requires annual distributions from the inherited account throughout the 10-year period as well.

Either way, the problem is the same. Those required annual distributions are calculated using the Single Life Expectancy table, which was designed for lifetime distributions spread over decades. A 55-year-old beneficiary would have a life expectancy factor of roughly 31.6, meaning the annual required distribution is about 3% of the balance. That formula was built to last 30+ years, not 10.

Applied to a 10-year window, those small distributions barely dent the account balance. The account keeps growing. By year 10, the remaining balance can actually be larger than the original inherited amount. You would think that following the IRS-mandated minimums would naturally spread the tax burden across the decade. It doesn't. Not even close.

The Number That Stopped Me

WhenIm64 has a reminder system that prompts you to act when things need to happen: apply for Medicare, file estimated taxes, take your RMD, etc. I was building the inherited IRA piece of that. The wizard confirms the prior year-end balance and calculates what the IRS requires for the current year.

Here is the scenario I tested. A spouse inherits a $175,000 traditional IRA in 2020 from a parent who was 76 at death and already taking RMDs. With the date set to 2026, the wizard calculated a required distribution of $9,375. Small, manageable, easy to absorb.

Then I set the date to 2030 to simulate the final year, when the account must be fully drained.

The wizard showed $178,512. The entire remaining balance, as a single ordinary income event in one tax year.

That was not a bug. The account had continued to grow for nine years while the small required distributions barely touched the principal. Everything left hits in year 10.

For a typical couple in their late 60s or early 70s in 2030, that $178,000 stacks on top of income that might already total $150,000 to $200,000 from their own RMDs, Social Security, and investment income. Total AGI in that single year: potentially $350,000 or more. Multiple IRMAA tiers breached. Tax brackets pushed to 32 or 35 percent on a significant portion. Medicare premiums spiking. A tax bill that looks nothing like any other year in the retirement plan.

That is the tax bomb. Small and quiet for nine years, then detonating in year 10 with full force.

What You Can Actually Do About It

If you inherited an IRA from someone who died in 2020 or later and still have years remaining in your 10-year window, you have options. The key insight is that the required minimum is not the recommended amount.

Take more than the minimum every year. Specifically, divide the current balance by the number of years remaining, including the final year, and take that amount annually. Recalculate every January using your year-end statement. This approach, applied consistently, eliminates the year-10 spike entirely.

For the $175,000 example with 5 years remaining including 2030:

• Required minimum (IRS formula): roughly $9,300
• Recommended distribution (equal spread over 5 years): $35,000
• Year-10 payment with this approach: $35,000

Yes, $35,000 per year is more taxable income in 2026 through 2029 than the $9,300 minimum. But you are choosing when to recognize the income, not whether to recognize it. Spreading it over five years at your current marginal rate is almost always better than concentrating it in one year at a potentially much higher rate.

If you are on Medicare: A $178,000 distribution in a single year will almost certainly push you into a higher IRMAA tier, adding $1,000 to $4,000 or more in Medicare surcharges that year. Spreading the same income over five years keeps you within your planned tier. The Medicare savings alone may justify the strategy.

If you have a Roth conversion plan: Inherited IRA distributions consume the same MAGI headroom as Roth conversions. A large year-10 spike in the middle of your conversion window compresses or eliminates conversion capacity in that year. Equal annual distributions preserve your strategy and keep the two from colliding.

What WhenIm64 Does With This

When I found this problem in the model, I built the solution into the app.

WhenIm64 now tracks inherited IRAs separately from your own retirement accounts, automatically identifies whether the pre-SECURE Act stretch rules or post-SECURE Act 10-year rules apply, and calculates both the required minimum and the recommended smoothed distribution. The annual RMD wizard, which fires every January when your year-end statements arrive, shows both numbers and explains why the difference matters. Voluntary distributions spread the balance equally across the remaining years, including the final year, to avoid a tax spike at the depletion deadline.

The Tax and IRMAA Projection chart shows the baseline scenario and the smoothed plan side by side.

Left panel: Following the required minimum distributions leads to a concentrated income spike in 2030. The spike is visible in the RMD tax layer, the effective rate jumps, and IRMAA exposure increases sharply in that single year.

Right panel: Combining a Roth conversion strategy with proactive inherited IRA smoothing reshapes the tax burden across multiple years, reducing peak rates and keeping IRMAA exposure in check. Total taxes paid are similar. What changes is the timing. You are not avoiding the tax. You are choosing when to pay it.

The deeper insight is this: smoothing the inherited IRA alone is not the full solution. The real gain comes from coordinating inherited IRA distributions with Roth conversions, IRMAA thresholds, and your own RMD timing so they don't collide in the same year. That is a planning problem, not just a rule quirk, and it is exactly what WhenIm64 is designed to model.

This is the kind of thing that should have been in your financial plan since 2020. For most people it wasn't, because advisors documented the rule change and moved on without modeling the consequences.

There are four years left before the first wave of 2030 depletion events. If you inherited a traditional IRA from someone who died in 2020, that clock is running.

Ben Sprachman is the founder of WhenIm64.ai, a retirement guiding tool for people navigating retirement. He is not a financial advisor or tax professional. This article is for educational purposes only. Consult a qualified tax advisor for guidance specific to your situation.