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Retirement6 min read

Required Minimum Distributions: Rules and Calculations

Understanding RMD requirements for traditional IRAs, 401(k)s, and other retirement accounts.

Last reviewed October 4, 2026. Tax figures and rules change — verify current-year amounts on irs.gov before relying on them.

1. What Is an RMD?

Required Minimum Distributions are minimum amounts you must withdraw annually from traditional IRAs, 401(k)s, 403(b)s, and other qualified retirement plans. The SECURE Act 2.0 raised the RMD beginning age to 73 for those reaching 72 after December 31, 2022, and will raise it to 75 for those reaching 73 after 2032.

2. When Must You Start?

Your first RMD is due by April 1 of the year after you turn 73. Subsequent RMDs are due by December 31 each year. Note that taking your first RMD by April 1 results in two distributions in that year—the first by April 1 and the second by December 31—which may increase your tax liability.

3. Calculating Your RMD

RMDs are calculated using IRS life expectancy tables. Divide your prior year-end account balance by the distribution period from the Uniform Lifetime Table. Use the IRS RMD worksheets or IRA custodian calculators. Each IRA requires its own calculation, but you may aggregate RMDs and withdraw from any one IRA.

4. 401(k) and Workplace Plans

RMDs from 401(k)s, 403(b)s, and other workplace plans are calculated separately and cannot be aggregated with IRA RMDs. Each plan requires its own distribution. If you are still working at age 73 and do not own more than 5% of the company, you may delay RMDs from that plan until retirement.

5. Roth Exceptions

Roth IRAs and designated Roth accounts in 401(k) and 403(b) plans generally do **not** require lifetime RMDs while the original account owner is alive. Beneficiaries remain subject to applicable RMD rules after the owner's death. If you fail to take the full required distribution, the shortfall can generally be subject to a **25% excise tax**. The rate may be reduced to **10% when the shortfall is corrected within the applicable correction period**.

6. Penalty for Missing RMDs

Failure to take the full RMD results in an excise tax of 25% of the shortfall (reduced from 50% by the SECURE Act 2.0). The IRS may waive this penalty if reasonable cause is shown and the shortfall is corrected promptly.

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Disclaimer: This article is for informational purposes only and does not constitute legal, tax, or financial advice. Tax laws are subject to change and individual circumstances vary. Consult a qualified tax professional before acting on any information contained herein.