Illinois 529 Tax Deduction 2026: up to $20,000 a year, worth about $990
Illinois takes money off your state tax bill when you put money into a 529 college fund for your child. Most parents never claim it — not because it's hard, but because nobody told them. Here's the whole thing in plain English.
What you can deduct
$10,000 ($20,000 married filing jointly) per year, per return. Fine print: IL plans only.
What it's worth
About 4.95 cents per dollar you contribute, up to the limit.
| You put in | Off your Illinois tax bill (≈) |
|---|---|
| $1,000 | $50 |
| $2,500 | $124 |
| $10,000 | $495 |
| $20,000 | $990 |
The trick: you don't need new money
If you pay for daycare, you probably qualify for federal tax breaks worth $1,000–$3,000 a year — the Dependent Care FSA at work and the childcare credit at tax time. Route that money into the 529 and Illinois pays you again for saving it. Same dollars, three tax breaks.
See all three breaks on your numbers — free 3-minute check. No card, no SSN, no bank login needed.
Find my childcare moneyHow to claim it — 3 steps
- Open the account (Bright Start (Illinois), about 15 minutes; you'll need your and your child's Social Security numbers and a bank account).
- Contribute by December 31. Automatic monthly transfers are the easiest way — even $50 a month counts.
- Put it on your Illinois return. TurboTax and the others ask about 529 contributions in the state section; a tax preparer just needs your year-end statement.
Do I have to use Illinois's plan?
Yes — the deduction is only for contributions to Illinois's own plan, Bright Start (Illinois).
Already have a 529 through Schwab, Fidelity, or Vanguard? Those are usually another state's plan, so Illinois gives you nothing for it. Keep that account, open Bright Start (Illinois) for new contributions, and ask a tax pro before rolling the old balance over — some states don't count rollovers.
Quick answers
How much can I deduct for 529 contributions in Illinois in 2026?
Up to $10,000 ($20,000 married filing jointly), per return. IL plans only.
What is the Illinois 529 deduction worth in real money?
About 4.95% of what you put in — roughly $495 on the full $10,000, or $990 on $20,000 for a couple. It's an estimate; your exact rate depends on your income.
Do I have to use Illinois's own 529 plan to get the deduction?
Yes — the deduction is only for contributions to Illinois's own plan, Bright Start (Illinois).
What's the deadline?
December 31. Contributions made by the end of the year count on that year's Illinois return.