On July 4, a new kind of account opened for business. Trump Accounts, created by the 2025 reconciliation law, are tax-deferred investment accounts for children. Kids born between 2025 and 2028 may receive a one-time $1,000 seed from the federal government. Parents, grandparents, and employers can add up to $5,000 a year. Until the child turns 18, the money grows in low-cost U.S. equity index funds and nothing else. At 18, the account converts to a traditional IRA.
Most of the coverage so far has debated the seed size, the index-only menu, and the name. All of that misses the number that matters. To find it, start with an old riddle about a pond.
A lily patch doubles in size every day, and on day 48 it covers the whole pond. On what day was the pond half empty?
Day 47. Not day 24. The final doubling contained as much growth as the previous 47 days combined. That is not a trick of the riddle. It is the defining property of anything that compounds. The end is not just bigger than the beginning. The end is bigger than everything before it, added together.
Most investors think about compounding in percentages. There is nothing wrong with percentages. But we have found the doubling to be an easier unit to understand, because it makes the roles of time and taxes impossible to miss.
Nine Years to Double
Assume money doubles every nine years. Back into the return that implies, and you get about 8% a year, the old rule of 72 in reverse, and a number in the neighborhood of long-run equity returns. That is the last percentage in this piece. From here, everything is counted in doublings.
At a nine-year cadence, a life is a ladder with about ten rungs: ages 9, 18, 27, 36, 45, 54, 63, 72, 81, 90. Each rung is worth more than every rung below it combined. A dollar that climbs all ten is roughly $1,000. Which means the $1,000 seed a newborn receives is, left completely alone, in the neighborhood of $1 million at 90. Nothing about that sentence involves skill. It is just rungs.
The Account, Counted in Rungs
Now look at what the Trump Account’s structure actually grants, ignoring everything else. Ignore the contribution limits, the index menu, and even the seed amount. The growth phase runs from birth to 18. At a nine-year doubling, that is exactly two rungs, completed before the owner’s first job.
Two doublings sound modest. It is not, because rungs only come from years, and years cannot be purchased later at any price. An investor who starts at 18 is not a little behind the one who started at birth. They are two rungs behind, permanently, on every dollar. The seed shows the arithmetic in miniature: $1,000 at birth is $4,000 at 18, having done nothing at all. Fund the account fully, $5,000 a year on top of the seed, and the balance at the conversion is roughly $191,000. But the dollars are not the gift. The rung count is.
The conversion at 18 is where the design earns its keep, because the ladder is just getting started. The fifty to seventy years that follow hold the biggest rungs of the owner’s life, and inside the wrapper, nothing punctures them. No dividend creates a tax bill. No rebalance does. Even swapping one investment for another after the conversion leaves the chain intact. The account can change its holdings for half a century without ever handing a rung back to the IRS.
Count what that protects. From 18, five more rungs arrive by 63. That $191,000 becomes about $6.1 million. A sixth rung lands by 72, and the ladder reads roughly $12 million. Money that turns out to be multigenerational and reaches rung seven at 81 sits near $24 million. These are hypothetical figures at an assumed doubling rate, but their structure is not hypothetical. Each new rung matched everything that came before it. The account’s job was simply to make sure nothing interrupted the chain while the rungs got large.
What Drag Does to the Ladder
Here is the same ladder with a leak in it. In a taxable account, a point and a half of annual tax drag stretches the doubling time from nine years to eleven. That sounds cosmetic. Count the rungs. Over the 45 years after conversion, five doublings become four, and $6.1 million at 63 becomes about $3.3 million. A leak that never looked bigger than a point and a half deleted the top rung, the one worth more than all the others combined.
Or see it one dollar at a time. A dollar of tax paid at 18 still had five rungs ahead of it. It was not a $1 tax. It was a $32 bill, paid early, and by rung ten a $256 bill. Paid at the end of the ladder instead, it is just a dollar. That is tax deferral with the jargon removed. Pay taxes after the doublings, not during them.
The honest ledger is short. Withdrawals are eventually taxed as ordinary income. Current law forces distributions to begin in the owner’s mid 70s, unless the account converts to a Roth along the way, a post of its own. And the money is locked, index-only until 18, and capped at $5,000 a year. A complement to a family’s plan, not the plan.
The pond riddle stays with people because the answer feels wrong. Half of everything, arriving on the second-to-last day. But that is where compounding keeps its money: on the top rungs, at the far end of decades that look unremarkable while they pass.
A child’s account opened this month starts with two free doublings and a chain the tax code cannot puncture for the fifty to seventy years that follow. The rate assumption can be argued. The ladder cannot. Count the rungs, protect the last one, and let the pond fill.
Disclosures
Past performance is not indicative of future results. This material is not financial advice or an offer to sell any product. The information contained herein should not be considered a recommendation to purchase or sell any particular security. Forward looking statements cannot be guaranteed. Hypothetical examples are for illustrative purposes only, do not reflect the deduction of fees or expenses, and are not indicative of any actual investment result.
This commentary offers generalized research, not personalized investment advice. It is for informational purposes only and does not constitute a complete description of our investment services or performance. Nothing in this commentary should be interpreted to state or imply that past results are an indication of future investment returns. All investments involve risk and unless otherwise stated, are not guaranteed. Be sure to consult with an investment & tax professional before implementing any investment strategy. Investing involves risk. Principal loss is possible.
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