IRS Publication 590-B · 2026 RMD Math · June 2026
The key question is not just "what's the number?" It's which IRS rule applies first. For 2026, if an inherited IRA is subject to annual required minimum distributions, the calculation generally uses the IRA balance at the end of 2025 divided by the applicable IRS life-expectancy factor in IRS Publication 590-B. If you are under the 10-year rule, the account may still have annual RMDs during the ten-year period, along with a final deadline to empty the account.
A useful inherited IRA RMD calculator 2026 must do one thing before any math: determine whether you're in the annual-RMD path or the 10-year-rule path. If you're in the annual-RMD path, the calculator estimates a yearly distribution amount. If you're in the 10-year-rule path, the calculator should focus on the deadline, not a yearly payout.
Under IRS rules, beneficiary status matters. The calculator should not assume every inherited IRA works the same way.
If you are in the annual-RMD category, the calculation uses the account balance at the end of 2025, not the current-year balance. This "look-back" detail is one of the easiest ways to make a wrong estimate.
A reliable calculator should ask a few plain-English questions before giving you a number.
At minimum, confirm whether the beneficiary is: spouse, non-spouse, or eligible designated beneficiary (EDB). Also confirm:
Determine whether the user is in the annual life-expectancy RMD category or the 10-year rule category. These are not always mutually exclusive: a beneficiary can have annual RMDs during the 10-year period. If the facts are not enough to tell, stop and verify rather than guess.
This is the balance used for the 2026 calculation. If you only know the current account balance, the estimate will be wrong.
For inherited IRA beneficiaries using a life-expectancy method, IRS guidance commonly points to the Single Life Expectancy Table (Table I) in Publication 590-B. Table selection can vary by beneficiary situation, including multiple beneficiaries and trust situations.
The output should include the final deadline — December 31 of the year containing the 10th anniversary of the owner's death — and should separately state whether annual RMDs apply during the period.
Here's the basic math for the annual-RMD path:
| Input | Example value |
|---|---|
| Inherited IRA balance on 12/31/2025 | $120,000 |
| IRS life-expectancy factor | 20.0 |
| Estimated 2026 RMD | $6,000 |
Formula: $120,000 ÷ 20.0 = $6,000
A lot of search traffic around inherited IRA RMD calculator 2026 comes from beneficiaries who may not owe a traditional annual RMD in 2026. That's because many non-eligible designated beneficiaries are under the SECURE Act 10-year rule. But the ten-year final deadline and annual RMD question are separate: some beneficiaries may owe annual RMDs during the ten-year period.
If you assume you owe an annual RMD when you're actually under the 10-year rule, you may over-distribute. If you assume the 10-year rule means "nothing matters until the end," you may miss important IRS conditions.
The biggest mistake is assuming every inherited IRA uses the same RMD formula. Some have annual RMDs, some follow a ten-year deadline, and some have both annual RMDs and the ten-year final deadline.
For a 2026 annual-RMD calculation, the balance used is the end-of-2025 balance.
Table selection depends on beneficiary situation. A calculator should not automatically apply one factor to all users.
The 10-year rule is not a free pass. There is still a final distribution deadline.
Even when the IRS rule is clear, custodians may handle timing, paperwork, and processing differently. The calculator is an estimate; the custodian's statement is the operational record.
| Input | Value |
|---|---|
| Balance on 12/31/2025 | $250,000 |
| IRS factor | 18.5 |
| Estimated 2026 RMD | $13,513.51 |
| Input | Value |
|---|---|
| Owner death year | 2020 |
| 10th anniversary year | 2030 |
| Final deadline | December 31, 2030 |
| 2026 annual RMD | $0 only if the stated facts mean no annual RMD is due; otherwise annual RMDs can apply. Full balance must be distributed by Dec. 31, 2030. |
Fees and account setup can affect what you receive after a distribution, even if they do not change the IRS formula. For inherited accounts holding gold or other alternative assets, custodian rules, dealer pricing, and liquidation timing can affect the net amount received after fees and spreads.
If you're moving an inherited account or holding nontraditional assets, processing can take time. That matters when a deadline is approaching.
For a 2026 annual RMD calculation, use the account balance as of December 31, 2025 — the prior year-end balance. Using a current-day or mid-year balance will produce an incorrect estimate.
For inherited IRA beneficiaries using a life-expectancy method, IRS guidance commonly points to the Single Life Expectancy Table (Table I) in Publication 590-B. The correct table depends on your beneficiary situation, so verify with the appropriate Publication 590-B worksheet.
Under the 10-year rule, many non-eligible designated beneficiaries are required to fully distribute the account by the end of year 10. Annual RMDs may also apply during that period depending on the beneficiary category and whether the owner died before or on or after the required beginning date. A $0 annual RMD is valid only when the stated facts support it.
It depends on your beneficiary category and whether the decedent died before or on or after their required beginning date. Some 10-year-rule beneficiaries owe annual distributions as well as the final clean-out; others may have no annual amount for a particular year. Confirm with IRS Publication 590-B and your custodian.
Using the wrong balance date, wrong table, or wrong rule can produce an incorrect required distribution amount. Under-distributions may be subject to a 25% excise tax, reduced to 10% if corrected within the IRS correction window.