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What Are Required Minimum Distributions (RMDs)?

Required Minimum Distributions (RMDs) are the minimum amounts you must withdraw each year from tax-deferred retirement accounts, including traditional IRAs, SEP IRAs, SIMPLE IRAs, 401(k)s, 403(b)s, and 457(b) plans. The IRS requires these withdrawals because contributions to these accounts were tax-deductible (or pre-tax), and the government eventually needs to collect income tax on the money. The RMD formula divides your account balance as of December 31 of the prior year by a life expectancy factor from the IRS Uniform Lifetime Table. As you age, the distribution period decreases, meaning you must withdraw a larger percentage each year.

The RMD rules do not apply to Roth IRAs during the original owner's lifetime, which is a significant advantage of Roth accounts. Roth 401(k)s previously required RMDs, but the SECURE Act 2.0 eliminated this requirement starting in 2024. Inherited IRAs (both traditional and Roth) have their own distribution rules that depend on the beneficiary's relationship to the original owner and when the account was inherited.

The RMD Formula and IRS Uniform Lifetime Table

The RMD formula is: RMD = Account Balance (Dec 31 of prior year) / Distribution Period (from IRS table). The IRS publishes the Uniform Lifetime Table (Table III) for most account owners. A separate Joint Life and Last Survivor Expectancy Table applies if your sole beneficiary is a spouse more than 10 years younger. The Uniform Lifetime Table was updated effective January 1, 2022 with longer life expectancy factors, resulting in slightly smaller RMDs compared to the previous table.

If you have multiple traditional IRA accounts, you can calculate the RMD for each but take the total amount from any one or any combination of your IRA accounts. However, 401(k) RMDs must be taken separately from each 401(k) plan. Many retirees consolidate their IRAs into a single account to simplify RMD administration. The RMD for each account is calculated independently using that account's December 31 balance.

SECURE Act 2.0: Key Changes to RMD Rules

The SECURE Act (2019) and SECURE Act 2.0 (2022) made significant changes to RMD requirements. The original SECURE Act raised the RMD starting age from 70.5 to 72. SECURE Act 2.0 further increased the starting age in two phases: to 73 for people born in 1951-1959 (effective 2023), and to 75 for people born in 1960 or later (effective 2033). This means someone born in 1960 will not need to take their first RMD until 2035, giving them up to three additional years of tax-deferred growth compared to previous law.

SECURE Act 2.0 also reduced the penalty for missing an RMD from 50% of the shortfall to 25%, and further to 10% if corrected within a "correction window" (typically by the end of the second year following the year the RMD was due). Despite the reduced penalty, missing an RMD on a $500,000 account at age 73 would still cost $1,887 to $4,717 in penalties, making timely distribution essential. Other key SECURE Act 2.0 provisions include eliminating RMDs for Roth 401(k)s, allowing 529-to-Roth IRA rollovers (with conditions), and indexing the IRA catch-up contribution limit to inflation starting in 2024.

Strategies to Minimize the Tax Impact of RMDs

Several strategies can help reduce the tax burden of required minimum distributions. First, consider Roth conversions before RMDs begin. Converting traditional IRA funds to a Roth IRA during lower-income years (such as early retirement before Social Security and RMDs start) shifts the money from a tax-deferred account to a tax-free account. You pay income tax on the conversion amount, but the converted funds grow tax-free and are never subject to RMDs. A well-planned conversion strategy spread over multiple years can significantly reduce lifetime taxes on retirement savings.

Second, Qualified Charitable Distributions (QCDs) allow individuals age 70.5 or older to transfer up to $105,000 per year (2024 limit, indexed for inflation) directly from an IRA to a qualified charity. QCDs satisfy your RMD requirement but are excluded from taxable income, providing a double benefit: you meet the RMD obligation and support charitable causes without increasing your adjusted gross income. Higher AGI can trigger Medicare premium surcharges (IRMAA), increase the taxable portion of Social Security benefits, and reduce eligibility for various tax deductions and credits.

Third, if you are still working past age 73, the "still working" exception allows you to delay RMDs from your current employer's 401(k) (but not IRAs or old 401(k)s) until April 1 of the year after you retire. This exception does not apply to 5% or greater owners of the business. Consolidating old 401(k) accounts into your current employer's plan before the RMD starting age can shelter those funds under this exception. Fourth, consider the timing of your first RMD: you can delay it until April 1 of the year following the year you turn 73, but this means taking two RMDs in that second year (the delayed first-year RMD plus the current-year RMD), which could push you into a higher tax bracket.

RMDs and Social Security: The Tax Interaction

RMD income interacts with Social Security taxation in a way that creates an effective marginal tax rate higher than most retirees expect. Up to 85% of Social Security benefits become taxable when combined income (AGI + non-taxable interest + half of Social Security) exceeds $34,000 for singles or $44,000 for married couples. A $20,000 RMD could cause an additional $17,000 of Social Security benefits to become taxable, creating an effective tax rate on the RMD that is much higher than the statutory rate. This "tax torpedo" affects retirees with moderate to large retirement accounts and can be mitigated through Roth conversions in the years before RMDs begin.

Medicare Part B and Part D premiums are also affected by RMD income through Income-Related Monthly Adjustment Amounts (IRMAA). If your modified AGI exceeds $103,000 (single) or $206,000 (married filing jointly), you pay higher Medicare premiums, potentially adding $1,000 to $5,000+ per person per year. IRMAA is determined based on your tax return from two years prior, so a large RMD in 2026 would affect Medicare premiums in 2028. Planning RMD amounts and Roth conversion timing around these income thresholds can save thousands in combined taxes and premiums.