Does Idaho offer a 529 tax deduction?

Yes. Idaho lets residents deduct contributions to an Idaho IDeal 529 plan from state taxable income, up to 6,000 dollars per year for single filers and 12,000 dollars for married couples filing jointly. The deduction lowers your Idaho income tax, not your federal tax.

How much can I deduct in Idaho?

The Idaho 529 deduction is capped at 6,000 dollars annually for a single or head-of-household filer and 12,000 dollars for married filing jointly. Contributions above the cap are not deductible that year, and Idaho does not allow carrying forward the excess to future years.

How is the tax saving calculated?

Your saving equals the deductible contribution (up to the cap) multiplied by your Idaho marginal income tax rate. Idaho uses a flat individual income tax rate, so most filers multiply the capped contribution by that single rate to find the state tax they avoid.

Do contributions have to be to the Idaho plan?

Yes. To claim the Idaho deduction the contribution must go to the Idaho-sponsored IDeal 529 plan. Contributions to another state's 529 plan are not deductible on your Idaho return, even though any 529 plan grows federally tax-free for qualified education expenses.

Does the deduction reduce my federal taxes too?

No. 529 contributions are not deductible on your federal return; the Idaho deduction only reduces your Idaho state income tax. The federal benefit is tax-free growth and tax-free qualified withdrawals, which apply regardless of which state's plan you use.

Idaho 529 Plan Tax Benefit Calculator

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Idaho lets residents deduct IDeal 529 plan contributions from state taxable income, up to 6,000 dollars (single) or 12,000 dollars (married filing jointly) per year. The deduction reduces your Idaho income tax by your marginal rate. Excess contributions above the cap are not deductible and cannot be carried forward. This tool estimates your annual state tax saving.

How it works

The deductible amount is your contribution capped at the filing-status limit, and the saving is that amount times your Idaho marginal rate:

cap         = single 6,000  |  married-jointly 12,000
deductible  = min(contribution, cap)
tax saving  = deductible × Idaho marginal rate

Idaho uses a flat individual income tax rate, so the marginal rate is the same across most income levels. Contributions must go to the Idaho IDeal plan to qualify.

Example and notes

A married couple contributing 15,000 dollars caps the deduction at 12,000 dollars; at a 5.695% Idaho rate the saving is 12,000 × 0.05695 = 683.40 dollars. A single filer contributing 4,000 dollars deducts the full amount and saves 4,000 × 0.05695 = 227.80 dollars. The remaining 3,000 dollars in the couple’s example is not deductible and does not carry forward. This estimates the state benefit only — federal 529 growth and qualified withdrawals are tax-free separately. Confirm the current cap and rate with the Idaho State Tax Commission.