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Idaho Individual Income Tax Filing deadlines and extensions for 2025.
If you are a resident or have been involved in significant business operations within Idaho, then you might be required to file Idaho State Taxes. We look at the most important tax deadlines and tax extensions for Idaho in 2025.
If your clients are residents, part-year residents with income from Idaho sources, or nonresidents of Idaho with income from Idaho sources, they might be required to file Idaho State Taxes. This page covers the most important tax deadlines and tax extensions for Idaho in 2025.
Idaho C Corporation Tax Deadlines for 2025
Your clients must file and pay Corporate Income Taxes in Idaho by April 15, 2026.
Estimated Tax Deadline for Idaho 2025:
Estimated tax payments are due:
Extension to File Taxes in Idaho for 2025
The Extension Deadline for Idaho corporate income tax returns is October 15, 2026.
Idaho automatically grants a six-month extension on filing corporate income tax returns. This means you do not need to file for an extension in Idaho.
This is an extension to FILE, not an extension to PAY – payment is still due April 15, 2026.
Idaho S Corporation and Partnership Tax Deadlines for 2025
Your clients must file and pay S Corporation or Partnership Income Taxes in Idaho by April 15, 2026.
Extension to File Taxes in Idaho for 2025
The Extension Deadline for Idaho S Corporation and Partnership tax returns is October 15, 2026.
Idaho automatically grants a six-month extension on filing income tax returns. This means you do not need to file for an extension in Idaho.
This is an extension to FILE, not an extension to PAY – payment is still due April 15, 2026.
Estimated Tax Deadline for Idaho 2025:
Estimated tax payments are due:
Individual Tax Deadline for Idaho 2025
Your clients must file and pay Individual Income Taxes in Idaho by April 15, 2026.
Extension to File Taxes in Idaho for 2025
The Extension Deadline for Idaho individual income tax returns is October 15, 2026.
Idaho grants a six-month extension automatically for filing personal income taxes, meaning you do not need to file for an extension.
This is an extension to FILE, not an extension to PAY – payment is still due April 15, 2026.
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The material discussed on this page is meant for general illustration and/or informational purposes only and is not to be construed as investment, tax, or legal advice. You must exercise your own independent professional judgment, recognizing that advice should not be based on unreasonable factual or legal assumptions or unreasonably rely upon representations of the client or others. Further, any advice you provide in connection with tax return preparation must comply in full with the requirements of IRS Circular 230.
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