Can You Combine RMDs? IRA & 403(b) Aggregation Rules

Yes, you can combine some RMDs, but not all of them.

For your own traditional, SEP, and SIMPLE IRAs, you calculate the required minimum distribution for each IRA separately, then you can generally take the combined total from one or more of those IRAs. Multiple 403(b) accounts have a similar aggregation exception. But each 401(k), 457(b), and most other employer-plan RMDs must be satisfied separately.

The important distinction is easy to miss: RMD aggregation is not retirement-account consolidation. Aggregating RMDs changes where an allowed required withdrawal may come from. Consolidating accounts changes where the assets themselves are held.

What RMD Aggregation Means. And What It Does Not

RMD aggregation means adding together RMD amounts that the tax rules allow you to satisfy as one combined withdrawal. It does not mean you calculate one RMD for the whole pile of accounts.

The IRS RMD comparison chart makes the sequence clear: calculate the RMD for each IRA separately first. Only after that calculation can eligible IRA RMDs be totaled and withdrawn from one or more of those IRAs.

I think of this as a two-column problem. The left column asks, “What does each account require?” The right column asks, “Which accounts are allowed to satisfy the total?” Most mistakes happen when someone jumps straight to the second column.

How IRA RMD Aggregation Works

For your own traditional IRAs—including SEP and SIMPLE IRAs—the rule is flexible after the math is done. The IRS says you determine the RMD for each IRA separately, then you may generally take the total from one or more of your eligible IRAs.

1. Calculate each IRA’s RMD separately. Use the prior December 31 account balance and the IRS distribution period that applies to that account owner and year.
2. Add the eligible IRA RMDs together. That gives you the total RMD obligation for that group of your own traditional, SEP, and SIMPLE IRAs.
3. Choose the withdrawal source. You may take the total from one IRA, split it among several eligible IRAs, or use another combination that satisfies the full total.
4. Keep records. Document the individual calculations and the distributions that satisfied the total.

Say you own three traditional IRAs with calculated RMDs of $5,000, $3,000, and $2,000. Your aggregate IRA RMD is $10,000. You could take all $10,000 from one of those IRAs or split the withdrawals among them, as long as the full $10,000 is distributed from eligible IRAs by the applicable deadline.

Calculator note: the calculator can help with the individual RMD math. It does not decide whether two different account types can be aggregated. That is the rule question this page is solving.

Which RMDs Cannot Be Combined?

This is the part I would put a box around on a retirement-account inventory: do not treat every tax-deferred account as one RMD bucket.

401(k) and 457(b) RMDs stay with their plans

The IRS RMD FAQs state that RMDs from 401(k) and governmental 457(b) plans must be calculated and withdrawn separately from each plan. Taking extra money from an IRA does not satisfy a missed 401(k) RMD.

403(b)s are the important exception

If you own multiple 403(b) accounts, calculate the RMD for each 403(b) separately. You may then generally total those RMDs and take the combined amount from one or more of your 403(b) accounts. Do not mix that 403(b) total with your IRA bucket.

Roth accounts do not create an owner-lifetime RMD bucket

The IRS RMD FAQs confirm that original owners of Roth IRAs and designated Roth accounts in employer plans do not have lifetime RMDs. Beneficiaries can have required distributions, so inherited Roth accounts belong in the beneficiary-rule check below.

Your spouse’s RMD is not your RMD

Married couples can coordinate household cash flow, but the RMD obligation is still tied to each individual account owner. Your IRA withdrawal cannot satisfy your spouse’s IRA RMD, and your spouse’s withdrawal cannot satisfy yours.

Can Inherited IRA RMDs Be Combined?

Inherited IRAs have a separate set of beneficiary rules, so do not automatically mix them with your own IRAs. Current IRS Form 5329 instructions say that when aggregation is allowed for inherited IRAs, it is limited to inherited IRAs from the same decedent under the applicable rules. An inherited IRA RMD generally cannot be satisfied from an IRA you own in your own name.

This is one place where I would resist the urge to memorize a slogan. Beneficiary type, the original owner’s situation, the year of death, and the SECURE Act rules can change the required distribution pattern. If you are dealing with an inherited account, use the dedicated guide to inherited IRA RMD rules before you decide what can be combined.

RMD Aggregation vs. Retirement-Account Consolidation

These two ideas are related, but they answer different questions.

• RMD aggregation: Can I satisfy several required distributions by taking the combined amount from one or more eligible accounts?
• Account consolidation: Should I actually move assets from multiple retirement accounts into fewer accounts?

You do not need to consolidate three traditional IRAs into one IRA just to aggregate their RMDs. Conversely, a rollover is not automatically smart merely because it could simplify future RMD administration. Fees, investment choices, plan protections, early-access rules, employer stock treatment, and Roth-planning consequences can matter.

If the question in front of you is “Should I move these accounts?” rather than “Where may I take this year’s required withdrawal?”, use the separate guide to retirement account consolidation. Keeping that decision separate is not just cleaner SEO. It is cleaner financial thinking.

How to Combine Eligible RMDs Step by Step

1. List every retirement account and its owner. Put your accounts and your spouse’s accounts on separate lines.
2. Label the account type. Traditional IRA, SEP IRA, SIMPLE IRA, 401(k), 403(b), 457(b), inherited IRA, or another plan.
3. Calculate the RMD for each account separately. Do not start by adding balances together.
4. Group only accounts that share an allowed aggregation rule. Your eligible IRAs are one potential group; your 403(b)s are a separate potential group. 401(k)s and 457(b)s remain separate.
5. Choose the allowed withdrawal source or sources. Make sure every plan-specific RMD and every aggregate-group total is fully satisfied.
6. Verify the deadline and keep the worksheet. Most subsequent RMDs are due by December 31. First-year timing can be different, and delaying the first RMD can cause two taxable RMDs to fall in the following calendar year.

For many current retirees, the applicable RMD starting age is 73. SECURE 2.0 raises the applicable age to 75 for people who attain age 74 after 2032. The IRS’s 2026 guidance on SECURE 2.0 RMD ages lays out that transition. Employer-plan timing can also depend on retirement status and plan terms.

Common RMD Aggregation Mistakes to Avoid

• Adding account balances before calculating. RMDs are calculated account by account before any allowed aggregation.
• Using an IRA to cover a 401(k) or 457(b) RMD. It does not satisfy the employer plan’s obligation.
• Treating 403(b)s like 401(k)s. The 403(b) aggregation exception is easy to miss.
• Pooling spouses’ RMDs. Household finances may be joint; RMD obligations are not.
• Mixing inherited IRAs with your own IRAs. Beneficiary accounts have separate rules and same-decedent limits can matter.
• Confusing aggregation with consolidation. You can aggregate eligible IRA RMD withdrawals without moving the underlying IRA assets into one account.

What If You Aggregated an RMD Incorrectly?

If you discover that an RMD was short because you took the money from the wrong account or aggregation group, correct the shortfall promptly and document what happened. The excise tax on an RMD shortfall is generally 25%, and it can be reduced to 10% when the shortfall is corrected within the statutory correction window and the other requirements are met.

The IRS can also waive part or all of the tax when the shortfall was due to reasonable error and you are taking reasonable steps to fix it. The current Form 5329 instructions explain how to report the shortfall and request reasonable-cause relief. A waiver is not automatic; the IRS decides whether to grant it.

Bottom Line: Calculate Separately, Combine Only Where Allowed

If you remember one thing, make it this: RMD aggregation is a withdrawal rule, not an account-merger rule.

Calculate every RMD separately first. Then put each account into the correct bucket. Your own eligible traditional, SEP, and SIMPLE IRAs can generally share one aggregate withdrawal total. Your 403(b)s have their own aggregation exception. Each 401(k) and 457(b) stays separate. Your spouse’s RMDs stay separate from yours. Inherited accounts need their own beneficiary-rule check.

That two-column test from the beginning is the whole game: What does this account require, and which account is actually allowed to satisfy it? Answer both questions before the money moves, and RMD aggregation becomes a useful simplifier instead of a compliance trap.

Sources

• Internal Revenue Service — RMD comparison chart for IRAs and defined contribution plans
• Internal Revenue Service — Retirement plan and IRA RMD FAQs
• Internal Revenue Service — Publication 590-B, Distributions from IRAs
• Internal Revenue Service — Instructions for Form 5329
• Internal Revenue Service — 2026 guidance reflecting SECURE 2.0 applicable RMD ages