RMDs Made Simple: How Required Withdrawals Can Trigger Surprise Taxes (and How to Plan Around Them)
Turning 73 can come with a hidden deadline: required IRA/401(k) withdrawals. Here’s how RMDs work, why taxes can jump, and simple ways to avoid surprises.
- RMDs are mandatory annual withdrawals from most pre-tax retirement accounts starting at a certain age—and missing them can be costly.
- RMDs can increase your taxable income, which may raise Medicare costs and make more of your Social Security taxable.
- Small moves—like planning which account to tap, timing withdrawals, and using charitable giving—can reduce “surprise tax” years.
Why people get blindsided by RMDs (even if they’ve saved responsibly)
Imagine you’re retired, your mortgage is finally gone, and your monthly spending is pretty steady. Your Social Security covers a chunk, maybe a pension covers another chunk, and your IRA is your “backup plan.” You don’t even want to touch it much because you like seeing that balance stay healthy.
Then you hear a new phrase—RMD, short for Required Minimum Distribution. It sounds like a technical detail… until you realize it’s a rule that can force money out of your retirement account whether you need it or not. And the forced withdrawal can raise your taxes in a way that feels like a penalty for being prepared.
Here’s the basic idea in plain English: many retirement accounts let you delay taxes while you’re working. The government eventually says, “Okay, now it’s time to start paying taxes on that money.” RMDs are the mechanism for that.
What accounts typically have RMDs?
- Traditional IRAs
- Most pre-tax 401(k)s and 403(b)s
- SEP and SIMPLE IRAs
What accounts typically do NOT have RMDs during your lifetime? The big one many people recognize: Roth IRAs (for the original owner). That difference is why retirees sometimes wish they had “more money on the Roth side” when RMD time arrives.
When do RMDs start? Under current rules, many people start RMDs at age 73 (this has changed in recent years, which is one reason the topic is so widely discussed). If you’re approaching that age—or helping a parent who is—this becomes a real calendar item, not a theory.
Why it feels like a surprise: Before RMDs, you often control your taxable income by choosing when to withdraw from retirement accounts. With RMDs, part of your income becomes “scheduled,” like a bill you must pay—but instead of paying money out, you’re forced to pull money in (and pay tax on it).
And here’s the sneaky part: the RMD itself may not be enormous in year one, but it can set off a chain reaction where your total costs rise—tax brackets, Medicare premiums, and the taxation of Social Security can all be affected.
How RMDs are calculated—and why the first “deadline” matters
RMD math is less mysterious than it looks. It’s basically:
Your account balance (as of a specific date) ÷ a life-expectancy factor = your required withdrawal
That factor comes from IRS tables. You don’t have to memorize them—your brokerage or 401(k) plan often calculates the RMD amount for you—but it helps to understand the logic: the government is estimating how long you might live and spreading your forced withdrawals across those years.
Where the confusion often starts: the first-year timing rule. Many people learn that their first RMD year gives them an option to delay the actual first withdrawal until a later deadline. That sounds helpful… but it can create a “double withdrawal” year.
Here’s a real-life style scenario:
- You turn 73 this year.
- You can take your first RMD this year—or delay it into early next year (depending on the current rule deadlines).
- If you delay, you may still have to take your second year RMD by the end of next year.
Result: two RMDs in one tax year. That can spike your income and push you into higher taxes or higher Medicare premiums. People do it accidentally all the time because the delayed deadline feels like “extra time,” not “two withdrawals later.”
Snackable checklist: when delaying the first RMD can backfire
- You already have decent taxable income (part-time work, pension, big interest/dividend year).
- You’re close to a Medicare premium threshold and a small income bump matters.
- You’re about to sell something (a property or investments) that creates extra taxable gains next year.
What about multiple accounts? Another common tripwire: you may have several IRAs and maybe an old 401(k). The aggregation rules can differ by account type. In everyday terms, some RMDs can be “combined” for withdrawal purposes (often among IRAs), while workplace plans usually need their own RMD taken from that plan. This is one of those spots where it’s worth slowing down and making a list of every retirement account you own.
| Account type | RMD required? | Common “gotcha” |
|---|---|---|
| Traditional IRA | Yes | Multiple IRAs can confuse tracking; people forget an old rollover IRA exists. |
| 401(k) / 403(b) (pre-tax) | Yes | Old employer plans are easy to overlook; plan administrators may mail notices you miss. |
| Roth IRA | No (for original owner) | Beneficiaries may have different rules; don’t assume “Roth means never.” |
Penalties are real. If you miss an RMD, the IRS can assess a penalty (rules have changed over time, but it can still be significant). More than the penalty itself, the stress comes from fixing it—paperwork, corrected withdrawals, and explaining what happened.
The “surprise tax” effect: how one RMD can ripple into Medicare and Social Security
Many retirees expect RMDs to be taxed as ordinary income. That part is straightforward: if you withdraw pre-tax retirement money, it’s generally taxable.
What catches people off guard is how the extra income can change other calculations that don’t feel like “income tax” at first glance.
1) RMDs can make more of your Social Security taxable
Social Security taxation uses a formula that looks at your other income. If you were right on the edge, an RMD can pull more of your Social Security benefits into the taxable column. It can feel like you’re being taxed twice, even though it’s really one formula reacting to a higher income level.
Everyday analogy: Think of Social Security taxation like a dimmer switch, not an on/off switch. As your “other income” rises, the taxable portion can brighten.
2) RMDs can increase Medicare premiums (IRMAA)
Medicare Part B and Part D premiums can rise for higher-income retirees due to income-related adjustments (often called IRMAA). The tricky part is timing: Medicare looks back at prior-year income. So a big RMD year can raise premiums later, when you’ve already forgotten why things got more expensive.
Mini-scenario:
- At 73, you take your RMD and also do a large one-time withdrawal to renovate a kitchen.
- Your taxable income jumps.
- Later, Medicare premiums increase because that higher income shows up in the lookback period.
- You’re confused because you’re not “earning more” now—yet costs went up.
3) RMDs can push you into a higher tax bracket (or undo credits/deductions)
Even if your marginal bracket doesn’t change dramatically, an RMD can stack on top of other income and increase the rate applied to the last dollars you earn. Sometimes the sting comes from losing eligibility for a tax break rather than the bracket itself.
So what can you do? The goal is usually not to “avoid RMDs” (you typically can’t), but to manage the ripple effects so the RMD doesn’t arrive like an unpleasant surprise.
Practical moves people use to plan around RMDs (without needing a finance degree)
- Map your “income stack” before the year starts. Write down expected Social Security, pension, part-time work, dividends, and then add the RMD estimate. Seeing the stack on one page makes the issue obvious.
- Consider spreading withdrawals across months. Many custodians let you automate monthly withdrawals. This doesn’t change taxes, but it helps cash flow and reduces the temptation to spend a lump sum quickly.
- Use withholding strategically. You can withhold federal (and sometimes state) taxes from the RMD itself, like a paycheck, which can prevent an underpayment surprise.
- Watch the “two RMDs in one year” trap. If delaying the first RMD means doubling up next year, run the numbers before you choose that path.
- Coordinate with charitable giving (if you already donate). Some retirees direct part of an IRA withdrawal to charity in a way that may reduce taxable income impact (rules apply). This is especially appealing to people who don’t need the full RMD for living expenses.
- Re-check investments for forced sales. If your RMD is taken in cash, you may need to sell holdings. Plan what to sell so you’re not forced into selling something you wanted to keep at a bad time.
A simple “planning conversation” prompt (useful with a spouse, adult child, or advisor):
- “If our RMD is $X this year, where is it going to land?” (checking account, reinvested in a brokerage account, used for travel, taxes withheld)
- “Do we want to take it monthly or all at once?”
- “Is next year a big-income year for any reason?” (home sale, Roth conversion, contract work, required withdrawal from another plan)
FAQ-style quick answers
No. You generally have to withdraw it from the retirement account, but you can keep it in cash, use it for bills, or reinvest it in a taxable brokerage account (assuming it’s after taxes).
No. You generally have to withdraw it from the retirement account, but you can keep it in cash, use it for bills, or reinvest it in a taxable brokerage account (assuming it’s after taxes).
Sometimes there’s an exception for certain workplace plans if you’re still working and meet specific conditions, but it doesn’t usually apply to traditional IRAs. This is a “check your plan rules” situation.
Sometimes there’s an exception for certain workplace plans if you’re still working and meet specific conditions, but it doesn’t usually apply to traditional IRAs. This is a “check your plan rules” situation.
The tax benefit of pre-tax accounts is based on deferring taxes—not avoiding them forever. RMDs are the government’s way of making sure taxable withdrawals eventually begin.
The tax benefit of pre-tax accounts is based on deferring taxes—not avoiding them forever. RMDs are the government’s way of making sure taxable withdrawals eventually begin.
RMDs are one of those retirement topics that sounds like paperwork but behaves like a lifestyle issue. It affects how much cash hits your checking account, what your tax bill looks like, and whether your “normal year” stays normal. A little planning—especially around timing and the income ripple effects—can turn RMD season from stressful into routine.