Your grandchild's new account has a 0.1% fee ceiling. Yours doesn't.

The Horizon

In 2044 a child born last year turns nineteen holding an account that compounded untouched since infancy. Last Thursday Treasury decided what that account is permitted to hold.

The answer is narrow: a fund tracking a United States equity index, no leverage, no active management, and total annual fees capped at one tenth of one percent. That is a brick.

The fee ceiling is the load-bearing part of it. Across an eighteen-year growth period it is worth more than most of the tax language wrapped around it.

The Event

Treasury and the IRS issued proposed regulations on eligible investments for Trump Accounts on August 20, released as IR-2026-96. The accounts themselves were created by the Working Families Tax Cuts.

Eligible holdings are limited to a mutual fund or exchange traded fund tracking an equity index of primarily U.S. companies, with the S&P 500 given as the example. Leverage and active management are ruled out.

So are individual stocks, bond funds, sector funds, inverse funds, and anything ESG-labeled. Covered annual fees and expenses cannot exceed 0.1% of the balance, roughly one dollar per thousand held.

Those restrictions bind during the growth period, which runs from account establishment to December 31 of the year the beneficiary turns 17. After that, the account is generally governed by traditional IRA rules.

Contributions are capped at a combined $5,000 a year in 2026 and 2027, indexed afterward, counting parents, grandparents and employers together. A separate one-time $1,000 federal contribution is available for citizen children born between January 1, 2025 and December 31, 2028.

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The Path

The fee cap is the most consequential number in the document. A 0.1% ceiling against a typical retail wrapper charging 0.5% is forty basis points a year, held down by regulation for eighteen years.

On maximum contributions that difference compounds into thousands of dollars of terminal value. It was created by a line in a rule rather than by any investment decision.

The second half of the rule is where the vehicle shows what it actually is. Once the growth period ends the account is generally subject to traditional IRA rules, so the money does not become a general-purpose asset at eighteen.

It becomes a retirement account belonging to someone else. That is a different instrument from a 529, which pays for education, and from a custodial brokerage account, which is liquid at majority.

Anyone weighing those three containers is choosing between education funding, liquidity, and a locked multi-decade compounding runway. Last Thursday made the third option concrete enough to price.

The exclusion of bond funds is a design choice with consequences. For the entire growth period the account is all-equity by rule, so its risk profile is set by regulation rather than by whoever funds it.

A builder who would normally glide an eighteen-year horizon toward fixed income cannot do it inside this wrapper. The offset has to sit elsewhere on the family balance sheet.

The consequence reaches into business capital as well. Employer contributions count inside the same $5,000 combined ceiling, which hands a business owner a benefit line with both a fixed cap and a mandated fee limit.

That combined ceiling also forces family coordination. A grandparent putting in $5,000 leaves nothing for the parent in the same year.

Then there is the cost side, which the coverage skips entirely. Every dollar routed into this container is a dollar leaving the funder's own path, and eighteen years at the maximum moves $90,000 of contributions onto a child's balance sheet.

That is not an argument against the account. It is the size of the trade, stated plainly.

One piece of this has a closing door. The $1,000 federal contribution reaches only citizen children born through December 31, 2028, which makes it a dated feature rather than a standing benefit.

The Watch

Comments on the proposed regulations close October 20, 2026. The term to track in the final version is the 0.1% fee cap, because it is the only number in the rule that compounds.

The regulations would apply to tax years beginning on or after January 1, 2026, which makes provider filings the next observable signal. Watch which fund families bring index products priced under ten basis points to this wrapper.

A container that had no defined shape last week now has one. The open question is no longer whether the vehicle exists, but which of three funding containers each dollar belongs in.