RMD Calculation: 2026 IRS Required Minimum Distribution Formulas & Rules

To calculate your IRS Required Minimum Distribution (RMD), divide your retirement account balance as of December 31 of the prior calendar year by the IRS life expectancy factor from the Uniform Lifetime Table (Table III): RMD = Prior Year-End Account Balance / Life Expectancy Distribution Period. Under the SECURE 2.0 Act, RMDs begin at age 73 for individuals turning 73 after January 1, 2023.

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Core Concepts & SECURE 2.0 Statutory Framework

A Required Minimum Distribution (RMD) is the statutory minimum dollar amount that the United States Internal Revenue Service (IRS) mandates account holders must withdraw annually from tax-deferred retirement accounts once reaching a defined threshold age. Because contributions to traditional accounts were made with pre-tax dollars and grew tax-free over decades, RMDs ensure that the federal government eventually collects ordinary income taxes on these accumulated funds.

The regulatory landscape governing RMDs underwent monumental reform through the SECURE 2.0 Act. Key statutory rules include:

• RMD Beginning Age: The starting age for RMDs is established at age 73 for individuals who reached age 72 after December 31, 2022 (birth cohorts 1951 through 1959). The threshold age steps up to age 75 beginning on January 1, 2033 (birth cohorts 1960 and later).
• Applicable Accounts: Traditional IRAs, SEP IRAs, SIMPLE IRAs, traditional 401(k), 403(b), and 457(b) plans.
• Roth Exemption: Designated Roth IRAs remain completely exempt from RMDs during the original owner’s lifetime. Furthermore, starting in 2024, SECURE 2.0 officially eliminated lifetime RMD requirements for employer-sponsored Roth 401(k) and Roth 403(b) accounts.
• Drastic Penalty Reductions: Historically, failing to take an RMD triggered a draconian 50% excise tax penalty. SECURE 2.0 reduced this penalty to 25%, and if corrected within the statutory two-year correction window, the penalty drops to 10%.

The Official IRS RMD Formula

The mathematical computation specified in IRS Publication 590-B is straightforward:

Selecting the Correct IRS Life Expectancy Table

The IRS maintains three distinct actuarial tables in Publication 590-B:

• Table III (Uniform Lifetime Table): Used by the vast majority of retirees. Applies to all unmarried account holders, married owners whose spouses are not more than 10 years younger, and married owners whose spouses are not the sole primary beneficiary.
• Table II (Joint Life and Last Survivor Table): Used exclusively when the account owner’s sole primary beneficiary is their spouse who is more than 10 years younger. This table yields larger life expectancy factors, resulting in significantly lower mandatory annual distributions.
• Table I (Single Life Expectancy Table): Used exclusively by beneficiaries who inherit retirement accounts.

Step-by-Step Practical Calculation Guide

1. Step 1: Determine Your Prior Year-End Account Balance — Obtain the official December 31 fair market value from your account custodian statements (Form 5498) for each tax-deferred account.
2. Step 2: Identify Your Attained Age — Determine the exact age you will reach on your birthday during the current distribution tax year.
3. Step 3: Look Up the Distribution Factor — Find your age in IRS Table III (Uniform Lifetime Table).
4. Step 4: Divide Balance by Life Expectancy Factor — Divide the December 31 balance by the factor to determine the minimum mandatory dollar distribution.
5. Step 5: Satisfy Deadlines to Avoid Excise Penalties — Complete the withdrawal prior to December 31 of the calculation year (or by April 1 of the following year for your first-ever RMD).

Worked Calculation Examples

Example 1: Standard Table III Calculation (Age 74)

A retiree celebrates their 74th birthday in 2026. On December 31, 2025, their Traditional IRA had a total verified fair market value of $580,000.00.

• Prior Year-End Balance: $$$580,000.00$$
• Attained Age in 2026: 74
• IRS Table III Factor for Age 74: 25.5
• Calculate RMD:
  $$text{RMD} = frac{$580,000.00}{25.5} = $22,745.10$$

Result: The retiree must withdraw at least $22,745.10 by December 31, 2026. Any amount withdrawn above this threshold is fully permitted but does not carry forward as credit toward future years.

Example 2: Younger Spouse Exception (Table II Joint Life)

A 73-year-old account owner has an IRA balance of $750,000.00. Their spouse is 58 years old (15 years younger) and is named as the sole primary beneficiary.

• Under standard Table III, the factor for age 73 is 26.5, yielding an RMD of:
  $$frac{$750,000}{26.5} = $28,301.89$$
• Under Table II (Joint Life for Ages 73 & 58), the life expectancy factor is 30.5, yielding an RMD of:
  $$frac{$750,000}{30.5} = $24,590.16$$

Financial Impact: Utilizing Table II reduces the required distribution by $3,711.73, lowering the household’s taxable income and allowing more capital to compound tax-deferred.

IRS Uniform Lifetime Table (Table III) Reference Guide

The following table presents the official IRS distribution periods and corresponding percentage distribution mandates from ages 73 through 90:

Retiree Age	Distribution Factor (Divisor)	Effective Distribution Rate (%)
73	26.5	3.77%
74	25.5	3.92%
75	24.6	4.07%
76	23.7	4.22%
77	22.9	4.37%
78	22.0	4.55%
79	21.1	4.74%
80	20.2	4.95%
82	18.5	5.41%
85	16.0	6.25%
90	12.2	8.20%

Common Pitfalls & High-Value Tax Strategies

• The “Double Tax” First-Year Trap: You are allowed to delay your very first RMD until April 1 of the year following the year you turn 73. However, if you delay, you must take two separate RMDs in that second tax year (the delayed first RMD by April 1, and the second RMD by December 31). This can inadvertently bump you into a higher federal income tax bracket and trigger increased Medicare IRMAA surcharges.
• Account Aggregation Rules: If you own multiple Traditional IRAs, you calculate the RMD for each account separately, but you can aggregate the total dollar sum and withdraw it from a single IRA. Conversely, 401(k) and 403(b) accounts cannot be aggregated across employers; each employer plan RMD must be calculated and distributed from that specific plan.
• Qualified Charitable Distributions (QCDs): Retirees aged 70½ or older can transfer up to $108,000 directly from an IRA to a qualified 501(c)(3) charity. A QCD counts directly toward satisfying your annual RMD without being added to your Adjusted Gross Income (AGI).

Related Guides & Practical Calculators

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Practical Application Note: Strategic RMD planning begins well before age 73. Analyzing partial Roth conversions in early retirement during low-income gap years can systematically decrease deferred balances, permanently reducing forced RMD tax exposure in later decades.