Direct answer: At 100, maximum account simplicity is the goal: one custodian, one checking account, automatic distributions, and nothing else. Complexity at this age is a risk and a burden. The fewer accounts an executor must locate and administer, the better. Every unnecessary account should be closed or consolidated.
Account Structure at 100: The Case for Maximum Simplicity
Why Simplicity Is a Safety Feature at 100
Account complexity at 100 is not a neutral organizational feature: it is a risk. Each additional custodian, each separate account, each manual process is a point where exploitation can occur, where distributions can be missed, where a beneficiary designation can be out of date, and where an executor will need to spend time and money to locate and resolve after death.
By 100, the window for simplification may be closing. Legal capacity to authorize account transfers, to close accounts, to update designations, is present now but may not be indefinitely. Acting while the capacity to simplify is present is better than leaving consolidation work to an executor who must petition a court for authority to do what a simple custodian transfer would have accomplished.
The target account structure at 100 is: one traditional IRA at one custodian with automatic monthly RMD distributions; one checking account for daily expenses and care bills; and if applicable, one taxable brokerage account at the same custodian as the IRA. Roth IRAs can remain open (they have no RMD requirement and grow tax-free for heirs), but they should be at the same custodian. Everything else should be consolidated or closed.
Required Minimum Distributions at 100
At 100, the IRS Uniform Lifetime Table divisor is approximately 5.8. This means roughly 17% of the prior year-end balance must be distributed annually. At 101, the divisor is approximately 5.2 (about 19%); at 102, approximately 4.9 (about 20%). These are very large mandatory distributions: a 300,000 dollar IRA at age 100 must distribute approximately 52,000 dollars in the year. The traditional IRA will be substantially depleted by its owner's natural death if no external assets are added.
The large RMD amounts at this age typically cover most or all care and living expenses, which simplifies cash flow planning. The distributions are taxable as ordinary income. At this income level, Medicare Part B and Part D premiums (which are income-adjusted via the IRMAA surcharge) should be reviewed annually: the surcharge can be significant if adjusted gross income exceeds IRMAA thresholds.
Automatic monthly RMD distributions eliminate the need for the account holder to initiate distributions and ensure the full annual amount is distributed on schedule. Any failure to take the full RMD amount by December 31 results in a 25% excise tax on the amount not distributed (reduced to 10% if corrected promptly). Automation prevents this entirely.
Taxable Accounts and the Stepped-Up Basis Advantage
Taxable brokerage accounts held until death receive a stepped-up cost basis at the date of death. This means heirs inherit the account with a cost basis equal to the value at death, not the original purchase price. If a position was purchased 40 years ago at 10 dollars per share and is worth 100 dollars per share at death, heirs receive it at a 100-dollar basis and pay no capital gains tax on the 40 years of appreciation.
This stepped-up basis benefit means that large taxable positions with substantial unrealized gains are often better held until death rather than sold during life. Selling during life generates a capital gains tax event; holding until death eliminates it entirely. This is one of the most valuable tax advantages available at this age and should be incorporated into every decision about whether to liquidate a taxable position.
The exception is when the cash is urgently needed for care and no other liquid assets are available. In that case, the choice is between paying capital gains tax now or failing to fund care. The latter is worse. But if care is funded from RMDs and other sources, holding appreciated taxable positions until death is usually the right call.
Frequently Asked Questions
How should a 100-year-old structure their finances?
The ideal structure at 100 is maximum simplicity: one custodian for all investment accounts, one checking account for expenses, automatic monthly RMD distributions from the traditional IRA, and nothing else. Roth IRAs can remain open at the same custodian. All other accounts should be consolidated or closed. The fewer accounts an executor must locate and administer after death, the better. Every unnecessary account is a risk and a burden.
Do required minimum distributions continue past 100?
Yes, required minimum distributions from traditional IRAs and 401(k)s continue indefinitely. At 100, the IRS Uniform Lifetime Table divisor is approximately 5.8, requiring roughly 17% of the prior year-end balance to be distributed annually. The distributions grow as a percentage of the account each year. They do not stop at any age: they continue for the lifetime of the account owner.
What accounts does a centenarian actually need?
A centenarian typically needs three things: a traditional IRA (or rollover IRA) for RMD distributions, a checking account for daily expenses and care bills, and possibly a taxable brokerage account for any remaining non-retirement assets. A Roth IRA can remain open with no RMD requirement. Everything else (old 401(k)s, accounts at multiple custodians, savings accounts at separate banks) should be consolidated into this minimal structure as soon as possible.