Inherited IRA Planning for High-Net-Worth Beneficiaries

High-net-worth families frequently inherit large IRAs — $500K to $3M+ — from parents or other relatives who spent a lifetime accumulating tax-deferred savings. What many beneficiaries don't realize until it's too late: the 10-year rule forces far more tax than most people expect, and IRS final regulations (T.D. 10001, July 2024) added a requirement that most professional advisors themselves didn't see coming. This guide explains what you're required to do, why the tax stacking problem can be severe, and how to plan distribution timing to minimize lifetime tax cost.

Who gets the 10-year rule — and who doesn't

Under SECURE 2.0 (§ 401(a)(9)(H)), most non-spouse IRA beneficiaries must empty the inherited account within 10 years of the original owner's death.¹ But Congress created a carve-out for Eligible Designated Beneficiaries (EDBs), who retain the old "stretch IRA" ability to take distributions over their own life expectancy:

For most HNW households, the inherited IRA beneficiary is an adult child — typically well over 10 years younger than the parent. That means the 10-year rule applies, and the annual RMD requirement discussed below is in play.

The T.D. 10001 twist: annual RMDs if the decedent was past RBD

When SECURE 2.0 passed in 2019, many tax professionals assumed the 10-year rule meant beneficiaries could take any amount in years 1–9 and distribute everything by year 10. The IRS final regulations (T.D. 10001, July 18, 2024) clarified otherwise: if the original IRA owner had already passed their Required Beginning Date (RBD) at the time of death, annual minimum distributions are mandatory in years 1 through 9.²

The annual RMD calculation uses the beneficiary's Single Life Expectancy factor:

1. Find your age in the year after the original owner's death — this determines your starting factor from IRS Table I (Single Life Expectancy).³
2. Divide the prior December 31 account balance by that year's factor.
3. Each subsequent year, reduce the factor by 1.0.
4. In year 10, distribute the entire remaining balance regardless of how much remains.

Example: You're 55 years old in the year after inheriting a $2M IRA from your 79-year-old parent (who was past RBD). Your starting Single Life Expectancy factor is 29.7 (age 55 from Table I).

• Year 1 RMD: $2,000,000 ÷ 29.7 = $67,340
• Year 2 factor: 28.7 → RMD = balance ÷ 28.7
• Year 3 factor: 27.7 → and so on…
• Year 10: entire remaining balance distributed

If the parent died before their RBD, beneficiaries have flexibility — there are no required annual distributions. You can take nothing for 9 years and distribute everything in year 10, or spread distributions however makes sense for tax planning. The 10-year rule is a deadline, not a schedule, in this scenario.

The income stacking problem

The core tax challenge with an inherited IRA isn't the rule itself — it's that distributions are taxed as ordinary income on top of whatever else you're already earning. For an HNW beneficiary, that stacking can be severe.

Scenario: adult child inheriting $2.5M IRA, age 55

At $494K MFJ, the inherited IRA distributions are taxed at 32–35% federal rates. Over a 10-year window with forced distributions growing as the factor shrinks, total federal and state income taxes on a $2.5M inherited IRA could exceed $900K–$1.1M — a 36–44% effective tax rate on the inheritance.

IRMAA interaction

If you or your spouse are on Medicare (age 65+) when receiving inherited IRA distributions, those distributions are included in MAGI — which determines Medicare Part B and Part D premiums through the IRMAA surcharge system. The 2026 IRMAA tiers for Married Filing Jointly:⁴

Because IRMAA uses a two-year lookback (2026 premiums are based on 2024 income), a large inherited IRA distribution in a given year won't show up in Medicare premiums until two years later — but it will show up. A beneficiary taking $200K from an inherited IRA in a year when their other income is $300K hits $500K total MAGI, landing in the top IRMAA tier two years later ($11,688/year extra for a couple). That adds $116,880 in Medicare surcharges over a decade on top of the income tax cost.

Planning strategies: controlling when and how much you distribute

Accelerate distributions in low-income years

The inherited IRA is a tax-timing problem, not an avoidance problem — you will pay tax on the money eventually. The goal is to pay at the lowest possible marginal rate. If you have a low-income year (sabbatical, partial-year retirement, a year before a business sale concentrates income), distributing more than the RMD that year at 22–24% beats distributing less at 37% a decade later.

Coordinate with Roth conversion planning on your own IRA

If you have a traditional IRA of your own and were planning Roth conversions, the year you take large inherited IRA distributions is generally not the year to do large conversions. Both distributions add to ordinary income. In years when the inherited IRA forces significant income, protect conversion headroom — and do conversions in years when the inherited RMD is smaller. See the Roth conversion guide for the bracket-filling framework.

State income tax timing

If you live in a high-tax state (California at 13.3%, New York at 10.9%, New Jersey at 10.75%) and plan to relocate, inherited IRA distributions taken after your domicile change are taxed at your new state's rate. On a $200K distribution, the difference between California and Florida is $26,600 — per distribution, per year. See the state income tax planning guide for audit traps around domicile changes.

Trust beneficiaries: conduit vs accumulation structures

If the IRA names a trust as beneficiary (common in estate plans), the type of trust determines distribution options. A conduit trust passes all distributions directly to beneficiaries — the 10-year rule and annual RMDs flow through to individual beneficiaries as if they inherited directly. An accumulation trust can retain distributions inside the trust — but trust income tax brackets compress quickly (37% bracket begins at just $15,650 of undistributed trust income in 2026). For most HNW estates, conduit trusts provide more tax flexibility unless the goal is protecting distributions from beneficiaries with creditor problems or behavioral issues.

Charitable-giving angle

Once you reach age 70½, you can make Qualified Charitable Distributions (QCDs) of up to $111,000/year directly from your own IRA — reducing your MAGI. QCDs do not apply to inherited IRAs. However, if you want to give charitably and also have an inherited IRA, the strategy is: take the inherited IRA distribution (taxable), donate cash from other sources equal to that amount to a donor-advised fund or directly to charity, generating a deduction that offsets the IRA income. The net cash position is the same; the tax impact is reduced.

Spouse beneficiary: significantly better options

A surviving spouse has options no other beneficiary gets:

• Spousal rollover. Roll the inherited IRA into your own IRA. It becomes your own account — you don't take RMDs until your own RBD (age 73 or 75), and your distributions use the Uniform Lifetime Table (longer factors than the Single Life Table). This is usually the best option if you don't need the money before 59½.
• Inherited IRA election. Treat it as an inherited IRA rather than rolling it over. Why would you do this? If the deceased spouse was older (past 59½) and you're younger, this lets you access funds penalty-free before you turn 59½. Once you turn 59½, you can roll the remaining balance into your own IRA.
• 10-year rule avoidance. Unlike all other non-EDB beneficiaries, a spouse who rolls over or treats the account as their own can stretch distributions over their own life expectancy via the Uniform Lifetime Table. There is no 10-year forced liquidation for a spouse who rolls over.

Calculator: 10-year inherited IRA projection

How an HNW advisor can help

The inherited IRA planning problem is fundamentally a multi-year tax optimization problem. The variables — annual income variation, state domicile changes, Roth conversion opportunities on your own accounts, charitable giving plans, and retirement timing — interact with each other across a 10-year horizon. A fee-only advisor working alongside your CPA can model the full interaction and identify distribution timing that might save $100K–$400K in federal and state taxes on a large inherited IRA, relative to taking distributions on autopilot.