Calculating Your RMD in 5 Easy Steps

RMD calculation rules 2026: A required minimum distribution (RMD) is the minimum amount you must withdraw each year from a tax-deferred retirement account once you reach your required beginning age. You calculate it by dividing your December 31 prior-year account balance by your life expectancy factor from the IRS Uniform Lifetime Table — then taking that amount by December 31 of the distribution year. Miss it and the penalty is severe.

For most retirement savers, the first withdrawal from a 401(k) or IRA feels like crossing a finish line. You spent decades putting money in, and now the government is finally asking you to take some out. But RMDs are where a lot of well-funded retirees quietly lose money — not because the math is hard, but because the deadlines, the account rules, and the ages have all changed in recent years.

Here’s how to calculate your RMD correctly, step by step.

What Is an RMD?

An RMD is the minimum amount that must be withdrawn from a retirement account each year. It is not a suggestion and it is not optional. The IRS requires it, taxes it as ordinary income, and penalizes you if you don’t take it.

When Are You Subject to RMDs?

Traditional IRA owners are subject to RMDs beginning in the year they turn 73. Participants in an employer plan may be able to delay RMDs if they are still working for that employer — but this exception does not apply to IRAs.

A rule that catches people off guard: your RMD age now depends on your birth year:

If you were born between 1951 and 1959, your RMD age is 73. If you were born in 1960 or later, your RMD age is 75. This is one of the most commonly misfired calculations in retirement planning, and getting the age wrong throws off every deadline that follows.

Step 1: Determine Your Distribution Year

The distribution year is the year for which you are taking a distribution, not necessarily the year in which you take it. That distinction matters in your first year.

You can delay your first RMD until April 1 of the year following the year you reach your required age. After that first year, all distributions should be made by December 31 of each year for which they are being taken.

The first-year trap: if you delay your first RMD until April 1 of the year after you reach your required age, you’ll still need to take another RMD by December 31 of that same year — resulting in two taxable withdrawals stacked into one tax year. For a high earner, that can push you into a higher bracket, trigger IRMAA surcharges on Medicare premiums, or phase out deductions you were counting on. Delaying is sometimes the right call, but it should be a deliberate decision, not a default.

Step 2: Find the Retirement Plan Balance

Use the balance as of December 31 of the prior year. Add back any outstanding rollovers.

That second sentence is where mistakes happen. If a distribution or rollover was in transit at year-end, the account statement may show a lower balance than the IRS expects you to use. The balance you calculate against must reflect the assets that belong in the account, not just what the statement happened to print on December 31.

Step 3: Determine the Life Expectancy Factor

Most IRA owners look up their age on the Uniform Lifetime Table each year to determine their factor. The factor decreases as you age, which means your required withdrawal percentage rises every year.

If a spouse is the sole beneficiary of an IRA account for the entire year and is more than 10 years younger than the account owner, the Joint Life Expectancy Table is used instead. That produces a smaller factor and therefore a smaller RMD — a meaningful advantage for couples with a significant age gap.

Note the “sole beneficiary for the entire year” requirement. If a beneficiary designation changed mid-year, or if anyone other than the younger spouse had any claim on the account during the year, you may not qualify for the joint table that year.

Step 4: More Mathematics

Divide the retirement plan balance (Step 2) by the life expectancy factor (Step 3). The result is the RMD that must be taken.

Take the RMD by December 31 of the distribution year, except for IRA owners in the year of their first distribution, who have until April 1 of the following year. There is a penalty for any portion of an RMD that is not taken — historically 25% of the shortfall, reduced to 10% if corrected within a specific window. That penalty is on top of the income tax you still owe on the withdrawal.

Worth knowing: you don’t have to withdraw in a single lump sum. You can take it monthly, quarterly, or in any schedule you like, as long as the total by the deadline meets or exceeds the required amount. For retirees managing bracket thresholds or Medicare premium tiers, spreading withdrawals across the year is often the better move.

Step 5: Take Notice of the Aggregation Rules

This is the step most people skip, and it’s the one that creates accidental penalties.

• RMDs from owned IRA accounts can be aggregated. You can take the full required amount from one IRA even if the calculation spans several.
• RMDs from owned 403(b) accounts can be aggregated.
• All other types of accounts cannot be aggregated.

That last point is the one that costs people money. You cannot satisfy a 401(k) RMD by withdrawing extra from your IRA. You cannot satisfy an inherited IRA RMD from your own IRA. Each of those accounts stands on its own, and each needs its own distribution.

Where RMDs Fit in a Real Financial Plan

An RMD is rarely just an RMD. It’s a taxable event that lands in the middle of a retirement income strategy, and it interacts with almost everything else:

• Tax planning. The withdrawal is ordinary income. It stacks on top of Social Security, pensions, and any Roth conversions you’re considering. The year you start RMDs is often the year Roth conversion windows close.
• Financial planning. Forced withdrawals can push you past IRMAA thresholds or cause more of your Social Security benefit to become taxable.
• Investment management. If RMD cash comes from a volatile position at the wrong moment, you’ve locked in a loss you didn’t choose.
• Estate planning & risk planning. What you don’t spend, you may want to pass on. Beneficiary designations, spousal age gaps, and the joint table all change what your heirs receive.

The calculation itself is five steps. The decisions around it are considerably more involved — and that’s the part worth getting advice on.

Frequently Asked Questions

At what age must I start taking RMDs?
Age 73 if you were born between 1951 and 1959. Age 75 if you were born in 1960 or later.

Can I delay my first RMD?
IRA owners can delay the first RMD until April 1 of the year after reaching their required age — but that same year’s RMD is still due by December 31, so two withdrawals land in one tax year. Employer plan participants who are still working may be able to delay, but that exception does not apply to IRAs.

What happens if I miss an RMD?
There is a penalty on any portion of an RMD not taken, on top of the income tax owed on the withdrawal. A missed or short distribution should be corrected as soon as it’s identified.

Can I take my RMD from any account I want?
Only within the same category. IRAs can be aggregated with IRAs, and 403(b)s with 403(b)s. All other account types must each satisfy their own RMD.

How is the life expectancy factor determined?
Most owners use the Uniform Lifetime Table, looking up their age each year. If a spouse is the sole beneficiary for the entire year and is more than 10 years younger, the Joint Life Expectancy Table applies.

Do I have to take my RMD as a lump sum?
No. Any withdrawal schedule works as long as the total taken by the deadline meets the required amount.

Financial Success Doesn’t Happen by Chance.
It takes Careful Planning and Expert Advice.

Contact one of our advisors at 940-464-4104, to discuss your RMD and retirement withdrawal questions. You may also schedule a free virtual consultation here. 

RFG Wealth Advisory in Argyle, Texas, is an independent, fee-only Registered Investment Advisor firm that always puts our clients’ interests first. We have a transparent, simple fee structure that’s easy to understand. Call us Today!

Investment advice is offered through RFG Wealth Advisory, a Registered Investment Advisor.