Inherited IRA RMD Calculator

The SECURE Act passed in December 2019 and took effect for deaths occurring on or after January 1, 2020. It rewrote inherited IRA rules for most non-spouse beneficiaries. An inherited IRA RMD calculator applies the new framework by first asking who you are to the decedent. If you’re a non-spouse beneficiary who isn’t disabled, chronically ill, a minor child of the decedent, or within ten years of the decedent’s age, you’re a non-eligible designated beneficiary. The 10-year rule applies. The calculator then schedules the full account to be emptied by December 31 of the tenth year following the year of death.

Year one isn’t always year one. If your father died on November 14, 2024, the clock starts in 2025 and the account must be empty by December 31, 2034. An inherited IRA RMD calculator handles the date math automatically — you enter the date of death and the tool runs ten calendar years from the following January. Pay attention to year-of-death distributions too. If your father hadn’t yet taken his 2024 RMD before he died, you as the beneficiary are responsible for taking that final distribution by December 31, 2024 — even though the 10-year clock hasn’t started yet. The calculator should flag this final-year-of-life RMD obligation, which most online tools miss entirely.

Here’s where IRS Notice 2024-35 matters. From 2020 through 2023, the IRS issued conflicting guidance about whether non-spouse beneficiaries had to take annual RMDs during the 10-year window or could simply empty the account in year ten. The agency waived penalties for missed RMDs in 2021, 2022, 2023, and 2024 while it sorted it out. Notice 2024-35 settled the question. If the decedent had already started taking RMDs — meaning they were 73 or older at death — the beneficiary must take annual RMDs in years one through nine and empty the balance in year ten. If the decedent died before their required beginning date, the beneficiary can skip annual RMDs and take whatever distribution pattern they want, as long as the account hits zero by December 31 of year ten. A good inherited IRA RMD calculator asks the decedent’s age at death and switches frameworks accordingly.

The annual RMD during years one through nine uses the IRS Single Life Expectancy Table. The calculator looks up your age in the year after the decedent’s death and pulls the life expectancy factor. That becomes your initial divisor. Each subsequent year, the divisor drops by exactly 1.0 — not a fresh table lookup. So a 55-year-old beneficiary in year one with a Single Life factor of 31.6 uses 30.6 in year two, 29.6 in year three, and so on down to 22.6 in year ten when the entire remaining balance must come out. The inherited IRA RMD calculator handles this subtraction automatically. Manual computation is error-prone — the Single Life Table updated in 2022 to reflect longer life expectancy, and beneficiaries who started before 2022 use a transition rule to reset their factor under the new table without restarting the schedule.

Most calculators show you two paths once they have the inputs. Path one is the minimum — take the annual RMD years one through nine, then a balloon in year ten. Path two is even — divide the starting balance by ten and pull the same amount every year. The minimum path leaves the most money compounding inside the IRA, which sounds good until you see the year-ten balloon. A $1M inherited IRA growing at 6% with only minimum RMDs leaves roughly $1.3M to distribute in year ten — potentially pushing the beneficiary into the 37% federal bracket for a single year. The even path is usually the better answer for taxable accounts. The inherited IRA RMD calculator should show both paths side by side so you can see the tradeoff in dollars, not just in compounding theory.

The surprising part: inheriting Mom’s $2M IRA isn’t a windfall — it’s a 10-year tax problem. The inherited IRA RMD calculator routinely shows non-spouse beneficiaries owing $400K-$700K in federal tax alone over the drawdown window, before state tax, IRMAA surcharges, or NIIT. A New York City beneficiary in the 32% federal bracket who also pays 6.85% state and 3.876% city tax loses roughly 43% of every inherited dollar to tax. We’ve sat in living rooms with adult children who thought they’d inherited $2M and learned they’d really inherited about $1.15M of after-tax spending power, paid out across a decade. The calculator surfaces that gap in the first session.

Roth inherited IRAs are subject to the same 10-year rule, but distributions are tax-free as long as the original Roth was at least five years old. The inherited IRA RMD calculator still schedules the drawdown — you still have to empty the account — but the tax cost line shows zero. That doesn’t make the timing irrelevant. Compounding inside the Roth for the full ten years is worth more than distributing early, so the optimal Roth inherited IRA strategy is usually the opposite of the traditional one: minimum distributions for nine years (or zero if the decedent died before their RBD), balloon in year ten. A $500K inherited Roth growing at 7% across ten years finishes at roughly $983K — all of which becomes tax-free liquidity in year ten, available to bridge an early retirement, fund a down payment, or seed a 529 plan for the next generation.

Successor beneficiary scenarios add another layer. If you inherited an IRA and you die before fully distributing it, the successor inherits under the same 10-year clock that was already running, not a fresh ten years. The inherited IRA RMD calculator should let you model this scenario by naming a successor and projecting their share of any remaining balance under the surviving years of the original clock. We’ve seen mid-drawdown deaths trigger surprise distributions for grandchildren who had no idea they were about to inherit a tax problem.

If you’re not sure whether the SECURE Act 10-year rule applies to your situation, the IRS publishes the full framework in Publication 590-B. Run the numbers through the calculators hub first, then bring the output to a planning conversation.