Roth Conversion Strategy at 18

This is the single most important tax strategy for Trump Account holders. At age 18, your child's account becomes a traditional IRA. If they convert it to a Roth IRA while in a low tax bracket, they can turn tax-deferred money into tax-free money for pennies on the dollar. Here is the exact math.

How Roth Conversion Works

A Roth conversion is simple in concept:

1. Move money from a traditional IRA to a Roth IRA.
2. Pay ordinary income tax on the amount converted in that year.
3. All future growth in the Roth IRA is tax-free.
4. Qualified withdrawals from the Roth IRA are tax-free.

The key insight: the tax rate you pay on conversion depends on your income in that year. If your child has little or no income at 18, the conversion happens at the lowest possible tax rates.

The 2026 Tax Math for an 18-Year-Old

Here are the approximate 2026 numbers for a single filer:

• Standard deduction: $14,600 — this amount is not taxed at all
• 10% bracket: $0 to $11,925 of taxable income
• 12% bracket: $11,926 to $48,475 of taxable income
• 22% bracket: $48,476 and above

"Taxable income" is your gross income minus the standard deduction. So if your child converts $14,600 from a traditional IRA to a Roth IRA and has no other income, their taxable income is $0. They owe zero dollars in tax on that conversion.

Example 1: Convert $14,600 (Tax-Free)

That is $14,600 moved from tax-deferred to tax-free for zero cost. Every dollar of future growth on that $14,600 is never taxed again.

Example 2: Convert $26,525 (~$1,193 in Tax)

Your child can convert more than the standard deduction. Here is what happens when they convert $26,525 with no other income:

For roughly $1,193 in taxes, your child converts $26,525 to a Roth IRA. That is an effective tax rate of just 4.5%. If that money grows at 8% for 40 more years, it becomes $576,000+ in tax-free money. The $1,193 tax bill is one of the best investments they will ever make.

Example 3: Convert $63,075 (~$5,579 in Tax)

For a larger account, here is what it looks like to fill up through the entire 12% bracket:

Converting $63,075 costs about $5,579 in taxes — an effective rate of 8.8%. That is still well below what most working professionals pay. This approach fills the 10% and 12% brackets completely without touching the 22% bracket.

The Pro-Rata Rule: Why You Cannot Cherry-Pick

This is the part most people get confused about. Your Trump Account contains two types of money: after-tax contributions (the $5,000/year you put in — you already paid tax on this) and pre-tax earnings (investment growth — never been taxed). When you do a Roth conversion, the IRS will not let you convert only the contribution portion first. They force you to pro-rate every conversion.

Pro-Rata Example: $60K Contributions, $40K Growth

Suppose you contributed $5,000/year for 12 years ($60,000 total). At 10% annual returns, the account is worth $100,000. That is 60% contributions and 40% earnings.

The critical insight: you only pay tax on the 40% that is earnings. The 60% that was your after-tax contributions is never taxed again. If you convert $25,000 and the child has no other income, only $10,000 is taxable — well under the standard deduction. Tax owed: $0.

The Gradual Conversion Strategy

If your child's Trump Account is worth $100,000 or more at age 18, converting the full amount in one year would push them into the 22% bracket or higher. Instead, spread the conversion over multiple low-income years.

Example: $120,000 Account, Converted Over 4 College Years

By spreading the conversion over 4 years, your child converts $120,000 to Roth for about $8,320 in total taxes. That is an effective rate of roughly 6.9%. If they waited until they were working full-time in the 22% bracket, converting $120,000 would cost closer to $26,400 — more than three times as much.

What Happens After Conversion

Once money is in a Roth IRA:

• All future growth is tax-free. If the $120,000 grows to $1,000,000 by age 65, no taxes are owed.
• Qualified withdrawals are tax-free. After age 59.5 (and the Roth has been open 5+ years), every withdrawal is completely tax-free.
• No required minimum distributions (RMDs). Unlike a traditional IRA, Roth IRAs do not force you to take money out at age 73+.
• Contributions (converted amounts) can be withdrawn penalty-free after 5 years. Growth must wait until 59.5 for penalty-free withdrawal.

Important Considerations

Where Does the Tax Money Come From?

Ideally, the tax on the conversion is paid from outside the IRA — from savings, a gift from parents, or earned income. If your child pays the tax bill from the IRA itself, that withdrawn amount triggers additional taxes and potentially the 10% early withdrawal penalty.

Part-Time Job Income Affects the Math

If your child has a part-time job earning $10,000 per year, that uses up some of the standard deduction and low brackets. The conversion amount should be reduced accordingly to stay in the lowest brackets. Always calculate based on total income (earned income + conversion amount).

Conversions Cannot Be Undone

Since 2018, the IRS no longer allows Roth conversion recharacterizations (undos). Once you convert, the tax is owed. Make sure the numbers work before executing the conversion.

Step-by-Step: How to Execute the Conversion

1. Estimate total income for the year (earned income + any other sources).
2. Calculate the optimal conversion amount — enough to fill the 10% and 12% brackets, but not enter the 22% bracket.
3. Open a Roth IRA at the same brokerage holding the traditional IRA (simplest) or a different one.
4. Request a Roth conversion from the brokerage. This is typically a simple online form or phone call.
5. Complete the conversion before December 31 of the tax year.
6. Set aside money for the tax bill — it will be owed when filing taxes the following April.
7. Report the conversion on Form 8606 with the annual tax return.

The Bottom Line

The Roth conversion at age 18 is the most valuable tax strategy available to Trump Account holders. An 18-year-old with no other income can convert $14,600 completely tax-free, or $26,525 for about $1,193 in tax. Spreading larger conversions over college years keeps the effective rate below 10%.

The result: money that would have been taxed as ordinary income at 22%, 24%, or higher later in life gets locked into a Roth IRA at an effective rate of 0% to 9%. Every dollar of future growth is tax-free forever.

For the full tax treatment of Trump Accounts, see Trump Account vs. Roth IRA. To model withdrawal scenarios, use the withdrawal simulator.