Connecticut 529 Tax Deduction 2026: up to $10,000 a year, worth about $550
Connecticut 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
$5,000 ($10,000 married filing jointly) per year, per return. Fine print: per return; CHET only; 5-yr carryforward; rollovers don’t count.
What it's worth
About 5.5 cents per dollar you contribute, up to the limit.
| You put in | Off your Connecticut tax bill (≈) |
|---|---|
| $1,000 | $55 |
| $2,500 | $138 |
| $5,000 | $275 |
| $10,000 | $550 |
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 Connecticut 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 (CHET (Connecticut), 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 Connecticut 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 Connecticut's plan?
Yes — the deduction is only for contributions to Connecticut's own plan, CHET (Connecticut).
Already have a 529 through Schwab, Fidelity, or Vanguard? Those are usually another state's plan, so Connecticut gives you nothing for it. Keep that account, open CHET (Connecticut) 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 Connecticut in 2026?
Up to $5,000 ($10,000 married filing jointly), per return. Per return; CHET only; 5-yr carryforward; rollovers don’t count.
What is the Connecticut 529 deduction worth in real money?
About 5.5% of what you put in — roughly $275 on the full $5,000, or $550 on $10,000 for a couple. It's an estimate; your exact rate depends on your income.
Do I have to use Connecticut's own 529 plan to get the deduction?
Yes — the deduction is only for contributions to Connecticut's own plan, CHET (Connecticut).
What's the deadline?
December 31. Contributions made by the end of the year count on that year's Connecticut return.