Required Minimum Distributions (RMDs): What They Are and How They Work

If you’ve saved diligently in tax-deferred retirement accounts, the IRS eventually wants its share. That’s where required minimum distributions (RMDs) come in. Understanding them early can help you avoid big penalties and unnecessary taxes later.

What Is a Required Minimum Distribution?

A required minimum distribution is the minimum amount you must withdraw each year from certain retirement accounts once you reach a specific age. RMDs apply to:

java.io.FileNotFoundException: https://pit21.s3.amazonaws.com/designs/WIDGETS/current-image//widget.html
  • Traditional IRAs
  • Rollover IRAs
  • SEP and SIMPLE IRAs
  • Most employer plans: 401(k), 403(b), 457(b), and similar

Roth IRAs do not require RMDs for the original owner, but Roth 401(k)s do (unless rolled into a Roth IRA).

Currently, many people must begin RMDs in the year they reach age 73 (with different ages applying depending on birth year, as tax law has changed). The year you “start” is called your required beginning date.

How RMDs Are Calculated

RMDs are based on two numbers:

  1. Your account balance on December 31 of the prior year
  2. A life expectancy factor from IRS tables (commonly the Uniform Lifetime Table)

Basic formula:
RMD = Prior year-end balance ÷ IRS life expectancy factor

For example, if your IRA was $500,000 on December 31 and your factor is 26.5, your RMD would be about $18,868. The custodian will often calculate this for you, but you’re responsible for getting it right.

Each qualifying account has its own RMD, though:

  • IRAs can typically be aggregated (you can take the total RMD from one or more IRAs).
  • Employer plans generally require separate RMDs from each plan.

When and How RMDs Are Paid

For most people:

  • Your first RMD is for the year you turn the required age, and you can delay that first one until April 1 of the following year.
  • After that, RMDs are due by December 31 each year.

Delaying the first RMD can bunch two taxable withdrawals into one year, potentially pushing you into a higher tax bracket.

You can take the RMD as:

  • One lump sum
  • Periodic withdrawals throughout the year
  • A combination, as long as you reach at least the required amount

Taxes, Penalties, and Planning Opportunities

RMDs from tax-deferred accounts are usually taxed as ordinary income. They can:

  • Push you into a higher tax bracket
  • Affect Medicare premiums and taxation of Social Security

Failing to take the full RMD triggers a steep IRS penalty on the shortfall, though recent law changes allow for lower penalties and possible waivers when corrected promptly.

Thoughtful planning can reduce future RMDs, including:

  • Roth conversions in lower-tax years before RMD age
  • Qualified charitable distributions (QCDs) directly from IRAs (if eligible), which can satisfy RMDs without increasing taxable income
  • Coordinating withdrawals with Social Security timing and other income

Understanding how RMDs work well before you reach the required age gives you more control over your tax bill, cash flow, and retirement lifestyle.