December 16, 2025

The Biggest Retirement Mistake Nobody Notices Until Their First RMD

Why RMDs at 73 can trigger unexpected tax bills and how to avoid costly mistakes

By Dan Cashion • 8-year retirement specialist, Charles Schwab & TD Ameritrade

Most retirement mistakes aren't dramatic.

This mistake doesn't show up until your first RMD, and by then, it's already locked in. Full breakdown: RMD Mistakes & Fixes (when the first RMD reveals an older problem). It doesn't involve market crashes, bad investments, or risky bets.

The mistake is quiet.

The mistake sits unnoticed for years…until Required Minimum Distributions (RMDs) force everything into the open.

The common belief

Most people think retirement mistakes happen because they don't know the rules.

That's rarely true.

What actually happens is more subtle:
people know the rules exist — they just misunderstand how many moving parts are involved.

Multiple accounts.
Multiple custodians.
Different timelines.
Different rules depending on account type.

It all feels manageable… until it suddenly isn't.

Where things quietly go wrong

RMDs don't care how organized you feel.
They care about what exists on paper.

By the time someone reaches RMD age, they often have:

several old employer plans

multiple IRAs opened at different points in life

accounts held at different custodians

beneficiary elections they haven't looked at in years

assumptions that "someone will remind me"

That's where the mistake lives.

Not in ignorance but in fragmentation.

The invisible assumption that causes the damage

Here's the assumption I see most often:

"Each account will handle its own RMD."

That assumption is partially true, which is what makes it dangerous.

Some accounts calculate RMDs separately.
Some allow aggregation.
Some don't.
Some issue reminders.
Some don't.
Some process distributions automatically.
Some require action.

The system does not reconcile itself.

The IRS expects you to.

Why people don't notice the mistake early

Before RMDs, nothing forces coordination.

You can:

let accounts sit untouched

forget where old plans are

ignore small balances

delay clean-up decisions

There's no immediate penalty for being disorganized.

RMDs are the first time the system says:
"Okay. Now everything counts."

And suddenly:

missed distributions surface

incorrect amounts matter

penalties become real

"I didn't know" stops being relevant

The penalty isn't the worst part

Yes, missed RMDs come with penalties.
Those can be painful.

But the bigger cost is lost flexibility.

By the time RMDs begin:

tax brackets are harder to manage

account structures are harder to change

timing options are narrower

cleanup decisions are reactive, not strategic

The mistake wasn't missing an RMD.

The mistake was letting complexity accumulate unchecked for decades.

Why this surprises even careful people

This doesn't just happen to inattentive savers.

It happens to:

diligent employees who changed jobs

people who "did everything right"

savers who maxed plans faithfully

households with good incomes

people who assumed simplicity would carry forward

The system rewards accumulation early… and punishes disorganization later.

The uncomfortable truth

RMD problems usually aren't created at age 73.

They're created at:

age 32 when an old 401(k) is left behind

age 41 when a second IRA is opened "temporarily"

age 50 when beneficiaries aren't updated

age 58 when consolidation feels inconvenient

The bill just arrives later.

Why no one talks about this clearly

This topic lives in an awkward space.

It's:

not exciting

not urgent early on

not catastrophic immediately

not intuitive

not well explained

So it gets deferred.

Until it can't be.

The quiet takeaway

The biggest retirement mistakes don't come from bad decisions.

They come from unmade ones.

From assuming the system will:

remind you

coordinate for you

fix itself

flag problems early

It won't.

And by the time RMDs force visibility, your options are usually fewer than you expected.

Most people don't realize they've made a retirement mistake.

They just discover,

much later,

…that they don't have many options left.

Educational purposes only. This content is general information, not tax or investment advice. Individual situations vary, and rules may change. Always consult appropriate professional resources for guidance specific to your circumstances.

Frequently Asked Questions

What is the biggest retirement mistake that people don't notice until their first RMD?

The biggest mistake is fragmentation - having multiple retirement accounts across different custodians with different rules, and assuming each account will handle its own required minimum distribution. This creates a complex web of obligations that becomes apparent only when RMDs begin at age 73, and by then it's too late to easily fix.

Why don't people realize they're making this mistake until it's too late?

The mistake is quiet and builds over years as people accumulate multiple IRAs and old employer plans at different custodians. People often assume 'someone will remind me' or that each account operates independently. The complexity only becomes clear when RMDs force all the moving parts into the open at age 73.

What makes the assumption about individual account RMDs so dangerous?

The assumption that 'each account will handle its own RMD' is only partially true, which makes it especially dangerous. Different account types have different rules, timelines, and calculation methods, but people don't realize this until they're already locked into a fragmented system that's difficult to manage.

How can I avoid this hidden RMD trap before it's too late?

Start organizing your retirement accounts well before age 73 by consolidating accounts where possible, updating beneficiary elections, and understanding the specific RMD rules for each account type you own. Don't assume each custodian will automatically handle everything correctly or remind you of your obligations across multiple accounts.