The "Magic" of Compounding: How Your 529 Plan Can Grow Faster Than You Think
Published November 4, 2026
Last Modified Date November 4, 2026
Here's something most parents don't realize about saving for college: investment earnings can generate their own earnings over time. It's called compounding, and it applies whether you started saving when your child was born or when they entered middle school. The question isn't whether it's too late to benefit from compounding. It's how to make the most of the time you have.
Here's what you need to know: it's never too late to start. Compounding isn't actually magic, though it can feel that way. It's math. And that math can still work in your favor, even if you didn't start when your child was born. Understanding how 529 plan compounding works can help you make the most of whatever time you have.
What is compounding and why does it matter?
Understanding how compounding works within a 529 plan is essential to recognizing how your savings can grow over time. Compounding is when your investment earnings start generating their own earnings. Let's say you make an initial contribution of $1,000 and it hypothetically earns $100. Now you can earn returns on $1,100, not just your original $1,000 investment. Do that over and over, and your money can grow faster than from contributions alone.
529 plans also give you the benefit of tax-deferred growth. In a regular investment account, as funds grow in value based on the market's performance, taxes may be owed each year on the investment income. In a 529 plan, any earnings or growth based on the performance of the investments are not taxed annually; instead, taxes on earnings are deferred until withdrawals are taken from the account. When you use the money for qualified education expenses, those withdrawals are tax-free.1 The benefit of tax-deferral removes the "annual drag" of taxes, allowing compounding to work more efficiently and potentially leading to larger account balances over long time periods.
Your time horizon matters too. If your child is 8 and you're just starting, you've got 10 years until college. That can be a meaningful time for your money to grow.
Maximizing growth in your 529 plan
Bright Start 529 has benefits that can work well for savers at any stage. Low fees mean more of your money stays invested. And Illinois taxpayers can deduct contributions up to $10,000 per year ($20,000 if married filing jointly).2
If you want to understand how the Bright Start 529 College Savings Plan works in more detail, the mechanics are straightforward. Your contributions go into investment portfolios you choose, earnings are tax-deferred, and you can withdraw the money for qualified education expenses without paying federal and for Illinois taxpayers state taxes on the earnings.
Practical steps to help your savings grow
Use our savings plan estimator tool to see how your savings could add up. This tool can give you an idea of the portion of college costs your contributions could cover based on your child's age and how much you plan to save. Then try different scenarios by clearing your information and starting again.
Front-load or make lump-sum contributions when possible. Got a bonus or tax refund? Starting contributions sooner allows your money more time to benefit from compound growth.
Ask friends and family members to contribute. Bright Start 529 offers Ugift®, a secure and convenient gifting platform, making it easy for grandparents and others to contribute directly. If they're Illinois taxpayers, they may qualify for state tax deductions on their contributions.
Select an investment portfolio that fits your needs. Bright Start 529 offers investment portfolios to meet different needs and circumstances. Use the Risk Tolerance Tool to help inform your investment portfolio selection. Along with other factors such as your savings goals, investment experience, and when you need to access the money, your risk tolerance can help you decide which investment portfolio works for you.
From a compounding standpoint, consistent contributions over time can make a meaningful difference to help grow your account.
Bright Start 529 features
Low fees matter. Fees directly impact your education savings. Illinois has some of the lowest fees in the nation.3 Lower fees mean more money toward your savings.
Tax-deferred growth means you're not losing returns to taxes each year. Over time, avoiding that annual tax impact can help your account grow.1
Illinois tax benefits let you reduce state taxable income by up to $10,000 ($20,000 married filing jointly) each year for contributions to Bright Start 529. Consult your tax advisor for guidance specific to your situation.2
Every contribution counts
Starting later doesn't mean you can't build meaningful savings. Every dollar you save is one less dollar your child may need to borrow. And the sooner you start, the more opportunity your savings has to grow.
Compounding works. It's not magic, but it is powerful.
