Compound Interest Calculator for Trump Accounts

Compound interest is the single most powerful force behind a Trump Account. A $$1,000 deposit that sits untouched for 18 years does not just grow by 18 years of returns. It grows by 18 years of returns on returns. Add monthly contributions, and the numbers get dramatic.

Try the Calculator

Adjust the sliders below to see how compound interest affects your child's Trump Account over 18 years.

How Compound Interest Works (Simple Explanation)

Here is the easiest way to understand it:

• Year 1: You have $1,000. It earns 8% = $80. New balance: $1,080.
• Year 2: You have $1,080. It earns 8% = $86.40. New balance: $1,166.40.
• Year 3: You have $1,166.40. It earns 8% = $93.31. New balance: $1,259.71.

Notice how the dollar amount earned increases every year — $80, then $86, then $93 — even though the rate stays the same. That is compounding. Each year's growth becomes part of next year's base.

Over 18 years, this snowball effect is significant. The longer the timeline, the more dramatic the curve.

Compound Interest Tables for Trump Accounts

Growth of the $1,000 Deposit Alone (No Additional Contributions)

Even with zero contributions, the $$1,000 deposit nearly quadruples at 8% over 18 years. At 10%, it grows to over $5,500.

Growth With Monthly Contributions (8% Return)

At max contributions ($417/month = $5,000/year), compound interest more than doubles your money. You put in $91,000 — you get back over $200,000.

Why Trump Accounts Compound Better Than Taxable Accounts

In a regular brokerage account, you pay taxes every year on dividends and capital gains. That reduces your balance, which means less money compounding. This is called tax drag.

Trump Accounts eliminate tax drag during the growth phase. Every dividend is reinvested pre-tax. Every dollar of growth compounds without the IRS skimming off a portion each year.

Over 18 years, the tax deferral advantage adds roughly 8-15% more to your final balance compared to a taxable account with identical contributions and returns.

The Rule of 72

A quick way to estimate compound interest: divide 72 by the annual return rate to find how many years it takes to double your money.

At the S&P 500's historical average of 10%, $$1,000 roughly doubles twice and then some over 18 years — landing at about $5,560.

Compound Interest Beyond Age 18

Here is what many parents do not realize: the compounding does not stop at 18. The account converts to a traditional IRA, and if your child leaves the money invested, it keeps growing.

• $5,000 at age 18 → ~$108,000 at age 65 (at 7% real returns, no additional contributions)
• $50,000 at age 18 → ~$1,080,000 at age 65 (same assumptions)
• $100,000 at age 18 → ~$2,160,000 at age 65

The 18-year growth phase is just the beginning. If your child converts to a Roth IRA at 18, all that future growth is completely tax-free.

Bottom Line

Compound interest is why Trump Accounts work. The combination of a long time horizon (18 years), stock market returns (~8-10%), and tax deferral creates a powerful wealth-building machine. You do not need to contribute thousands per month. Even the $$1,000 deposit alone, left to compound, becomes a meaningful head start for your child.

For full projections with more options, use our growth calculator.