Idaho
State Personal Income
Tax Extension

What Form does the state of Idaho require to apply for
an extension?

There is no state-specific form to request an extension, as the state of Idaho automatically provides the extension for up to 6 months for individuals to file an income tax return with
the state.

How do I pay my balance due to the state
of Idaho?

If you owe Idaho state taxes, you must pay the tax due by the regular due date. Otherwise, you will be charged with penalties and interests.

To make a payment with the state, use Payment Voucher (Form 51).

You may also pay your tax due with a check, money order, credit card, E-Check, or ACH Debit or mailing the payment voucher.

• Online by credit/debit card or e-check. The credit cards we accept are American Express, Discover, MasterCard, and Visa.
• ACH Debit: You may pay by ACH Debit by visiting https://tax.idaho.gov/i-1042.cfm
• Cash, checks, money orders, and ACH credit.

When is the due date to file personal tax Form 40
with Idaho?

Idaho personal tax filings are due by May 17, or by the 15th day of the 4th month following the end of the taxable year for fiscal year filers.

Although the state gives you an automatic 6-month extension to file your return, the interest is still applicable for late filing.