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How Required Minimum Distributions (RMDs) Are Calculated

ByWallstreet Observer

Quick answer

  • RMDs are calculated based on your account balance and your age, using IRS life expectancy tables.
  • The IRS provides specific tables to determine your “distribution period” or “life expectancy factor.”
  • You’ll divide your account balance as of December 31st of the previous year by your life expectancy factor.
  • If you have multiple retirement accounts of the same type (e.g., several traditional IRAs), you can calculate RMDs for each and withdraw the total from any one of them.
  • For inherited IRAs, the calculation method can vary depending on the owner’s death date and whether you are a spouse beneficiary.
  • Failure to take an RMD can result in a significant penalty.

Who this is for

  • Individuals who have reached the age at which RMDs are required for their retirement accounts.
  • Beneficiaries who have inherited retirement accounts and need to take distributions.
  • Anyone planning for retirement income and understanding withdrawal strategies from tax-advantaged accounts.

What to check first (before you act)

Your RMD Age and Deadlines

The age at which you must start taking RMDs has changed over time. For most individuals, this is currently age 73, but it’s essential to confirm your specific age based on your birthdate according to IRS rules. The deadline for taking your RMD each year is December 31st. If you are taking your first RMD, you may have a grace period until April 1st of the following year, but this is a one-time deferral. Always check the IRS guidelines for the most current age requirements.

Your Retirement Account Balances

You will need the exact account balance for each of your relevant retirement accounts as of December 31st of the previous year. This includes traditional IRAs, SEP IRAs, SIMPLE IRAs, 401(k)s, 403(b)s, and other employer-sponsored retirement plans. Roth IRAs do not have RMDs for the original owner, but beneficiaries may have them. Ensure you have accurate statements for all accounts.

Applicable IRS Life Expectancy Tables

The IRS provides three main life expectancy tables: the Uniform Lifetime Table, the Joint Life and Last Survivor Expectancy Table, and the Single Life Expectancy Table. The Uniform Lifetime Table is used by most account owners. If your spouse is the sole beneficiary and is more than 10 years younger than you, you will use the Joint Life and Last Survivor Expectancy Table. Beneficiaries of inherited IRAs typically use the Single Life Expectancy Table. You can find these tables in IRS Publication 590-B.

Your Status as an Account Owner or Beneficiary

The calculation for RMDs differs significantly if you are an account owner versus a beneficiary of an inherited retirement account. Beneficiaries have specific rules based on the original owner’s death, their relationship to the owner, and whether the owner died before or after their required beginning date. Consult IRS Publication 590-B or a tax professional to understand the nuances for inherited accounts.

Step-by-step (how are RMDs calculated)

1. Determine Your RMD Age:

  • What to do: Confirm the age at which you are required to start taking distributions. This age is based on your birthdate and current IRS regulations.
  • What “good” looks like: You know your exact RMD start age and the deadline for taking your annual distribution (December 31st, with a potential first-year deferral to April 1st).
  • Common mistake: Assuming you know your RMD age without verifying current IRS rules, which can lead to missed distributions. Avoid this by checking IRS Publication 590-A or consulting a tax advisor.

2. Gather Your Account Balances:

  • What to do: Obtain the exact year-end account balance for each of your traditional retirement accounts as of December 31st of the previous year.
  • What “good” looks like: You have precise balance figures for all your IRAs, 401(k)s, etc., readily available.
  • Common mistake: Using an estimated balance or a balance from a different date, which will lead to an incorrect RMD calculation. Always use the official December 31st statement.

3. Identify the Correct IRS Life Expectancy Table:

  • What to do: Determine which of the IRS life expectancy tables applies to your situation. For most account owners, it’s the Uniform Lifetime Table.
  • What “good” looks like: You’ve identified the correct table (Uniform, Joint Life, or Single Life) based on your marital status, beneficiary status, and age differences.
  • Common mistake: Using the wrong table, especially if your spouse is a much younger beneficiary. This can result in taking too little or too much out. Always cross-reference with IRS Publication 590-B.

4. Find Your Life Expectancy Factor:

  • What to do: Locate your age in the relevant IRS life expectancy table to find your corresponding “distribution period” or “life expectancy factor.”
  • What “good” looks like: You have the specific number from the table that corresponds to your age and the chosen table.
  • Common mistake: Misreading the table or using a factor for the wrong age. Double-check the row and column you are referencing.

5. Calculate Your RMD:

  • What to do: Divide your December 31st account balance by your life expectancy factor.
  • What “good” looks like: You have performed the division accurately to arrive at your RMD amount for the year.
  • Common mistake: Performing the division incorrectly or using the wrong numbers. Use a calculator and verify your inputs.

6. Calculate RMDs for Multiple Accounts (if applicable):

  • What to do: If you have multiple traditional IRAs, calculate the RMD for each individually. You can then aggregate these amounts and withdraw the total from any one of your IRAs. For employer-sponsored plans (like 401(k)s), you generally must take RMDs from each plan separately.
  • What “good” looks like: You understand the aggregation rules for IRAs and the separate withdrawal rules for employer plans.
  • Common mistake: Incorrectly aggregating or not taking RMDs from all required employer plans. Clarify the rules for your specific account types.

7. Withdraw Your RMD:

  • What to do: Take the calculated RMD amount from your retirement account(s) by December 31st.
  • What “good” looks like: The funds have been withdrawn and are in your possession or have been transferred as intended.
  • Common mistake: Forgetting to withdraw the funds or withdrawing less than the required amount. Set a reminder and confirm the withdrawal has been processed.

8. Report on Your Tax Return:

  • What to do: Report the RMD withdrawal as taxable income on your federal tax return for the year the distribution is taken.
  • What “good” looks like: Your tax return accurately reflects the RMD income, avoiding issues with the IRS.
  • Common mistake: Failing to report the income or misreporting it. Keep records of your RMD withdrawals for tax filing.

Common mistakes (and what happens if you ignore them)

| Mistake | What it causes | Fix

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