2025 Idaho Income Tax Filing Deadlines for 2024 Returns

Idaho State Income Taxes for the 2024 tax year can be prepared and e-filed, along with your IRS or Federal Income Tax Return. You can also find out how to prepare and e-file just an Idaho state return. Check the deadlines for IRS or Federal Tax Returns.

Tax Deadlines and the Idaho Tax Day

The majority of deadlines listed here are for the 2024 tax year and are due in 2025; some apply to upcoming years and some are IRS or federal deadlines. After Oct. 15 you can no longer e-file tax returns or current year tax amendments. They will have to be filed via paper tax forms.

Deadline

Type

Description

Prepare, eFile, Download
ID + IRS Tax Return

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Start Federal and Idaho Tax Returns

April 15, 2025

Income Tax Return

Prepare and e-File an IRS (Due Date April 15) and Idaho State Income Tax Return (Due Date April 15) until October 15 - eFileIT

April 15, 2025

Income Tax Extension

See Idaho Income Tax Extension Details.

October 15, 2025

Income Tax Return after the April 15 Idaho Tax Extension

Last day to e-File a 2024 Idaho State Income Tax Return for Tax Extension Filers and late eFilers. You can only e-File (to file by paper see below) Idaho Income Tax Return together with an IRS Tax Return - eFileIT

October 15, 2025 via mail-in Forms.
Forms incl. Mailing Address

Income Tax Return after the April 15 Idaho Tax Extension

Deadline for taxpayers who got an ID Tax Extension to file their Idaho Income Tax Return by mail-in Forms - the Forms incl. mailing addresses are listed here - is October 15, 2025. (Optionally, the eFileIT deadline is October 15, 2025). Instructions on how to only - without the IRS return - prepare and file an Idaho State Income Tax Return on eFile.com.

Complete and Mail In Now

Tax Amendment for all Tax Years

Detailed Instructions on how to prepare and mail in a Idaho State Income Tax Return Amendment.

IRS Due Dates

IRS Tax Return, Extension, Amendment Deadlines

Detailed current and future Federal or IRS Income Tax Deadlines

April 15, 2026

2022 Idaho Income Tax Return Refund.

The last day to file - you will not face late filing penalties - and claim your 2022 Idaho Income Tax Return Refund. This deadline does not apply if you owe 2022 Income Taxes. See details on unclaimed refunds.

April 15, 2027

2023 Idaho Income Tax Return Refund.

The last day to file - you will not face late filing penalties - and claim your 2023 Idaho Income Tax Return Refund. This deadline does not apply if you owe 2023 Income Taxes. See details on unclaimed refunds.

April 15, 2028

2024 Idaho Income Tax Return Refund.

The last day to file - you will not face late filing penalties - and claim your 2024 Idaho Income Tax Return Refund. This deadline does not apply if you owe 2024 Income Taxes. See details on unclaimed refunds.

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