Idaho business filing due dates
The Idaho deadlines Ordexly tracks for Oct 2026 to Oct 2027. Every date links to the agency page it was checked against (last checked ). Which ones apply to a business depends on its registrations and filing frequency, so confirm with the agency.
Annual report based on formation date
Idaho Annual Report (anniversary). Idaho annual report due by close of business on the final day of the anniversary month (Idaho Code 30-21-213(c)). Weekend due dates shown on the prior Friday. Official source.
Ordexly works out this date for each business from its formation month.
Sales & use tax
| Due | Deadline | Source |
|---|---|---|
| Idaho sales and use tax return (monthly filers) October 2026 | official source | |
| Idaho sales and use tax return (monthly filers) November 2026 Moved from Sun, Dec 20 (weekend). | official source | |
| Idaho Form 850 sales tax return (annual) 2026 | official source | |
| Idaho Form 850 sales tax return (quarterly) Q4 2026 | official source | |
| Idaho Form 850 sales tax return (semiannual) H2 2026 | official source | |
| Idaho sales and use tax return (monthly filers) December 2026 | official source | |
| Idaho sales and use tax return (monthly filers) January 2027 Moved from Sat, Feb 20 (weekend). | official source | |
| Idaho sales and use tax return (monthly filers) February 2027 Moved from Sat, Mar 20 (weekend). | official source | |
| Idaho Form 850 sales tax return (quarterly) Q1 2027 | official source | |
| Idaho sales and use tax return (monthly filers) March 2027 | official source | |
| Idaho sales and use tax return (monthly filers) April 2027 | official source | |
| Idaho sales and use tax return (monthly filers) May 2027 Moved from Sun, Jun 20 (weekend). | official source | |
| Idaho Form 850 sales tax return (quarterly) Q2 2027 | official source | |
| Idaho Form 850 sales tax return (semiannual) H1 2027 | official source | |
| Idaho sales and use tax return (monthly filers) June 2027 | official source | |
| Idaho sales and use tax return (monthly filers) July 2027 | official source | |
| Idaho sales and use tax return (monthly filers) August 2027 | official source | |
| Idaho Form 850 sales tax return (quarterly) Q3 2027 | official source | |
| Idaho sales and use tax return (monthly filers) September 2027 | official source |
Payroll & withholding
| Due | Deadline | Source |
|---|---|---|
| Idaho Form 910 withholding (quarterly filers) Q3 2026 | official source | |
| Idaho Form 910 withholding payment (semimonthly filers) (monthly) Oct 2026 16th-end | official source | |
| Idaho Form 910 withholding payment (monthly filers) (monthly) Oct 2026 | official source | |
| Idaho Form 910 withholding payment (semimonthly filers) (monthly) Nov 2026 1st-15th | official source | |
| Idaho Form 910 withholding payment (semimonthly filers) (monthly) Nov 2026 16th-end | official source | |
| Idaho Form 910 withholding payment (monthly filers) (monthly) Nov 2026 | official source | |
| Idaho Form 910 withholding payment (semimonthly filers) (monthly) Dec 2026 1st-15th | official source | |
| Idaho Form 910 withholding payment (semimonthly filers) (monthly) Dec 2026 16th-end | official source | |
| Idaho Form 910 withholding payment (monthly filers) (monthly) Dec 2026 | official source | |
| Idaho Form 910 withholding payment (semimonthly filers) (monthly) Jan 2027 1st-15th | official source | |
| Idaho Form 910 withholding (quarterly filers) Q4 2026 | official source | |
| Idaho Form 910 withholding payment (annual filers) (annual) 2026 | official source | |
| Idaho Form 910 withholding payment (semimonthly filers) (monthly) Jan 2027 16th-end | official source | |
| Idaho Form 910 withholding payment (monthly filers) (monthly) Jan 2027 | official source | |
| Idaho Form 910 withholding payment (semimonthly filers) (monthly) Feb 2027 1st-15th | official source | |
| Idaho Form 910 withholding payment (semimonthly filers) (monthly) Feb 2027 16th-end | official source | |
| Idaho Form 910 withholding payment (monthly filers) (monthly) Feb 2027 | official source | |
| Idaho Form 910 withholding payment (semimonthly filers) (monthly) Mar 2027 1st-15th | official source | |
| Idaho Form 910 withholding payment (semimonthly filers) (monthly) Mar 2027 16th-end | official source | |
| Idaho Form 910 withholding payment (monthly filers) (monthly) Mar 2027 | official source | |
| Idaho Form 910 withholding payment (semimonthly filers) (monthly) Apr 2027 1st-15th | official source | |
| Idaho Form 910 withholding (quarterly filers) Q1 2027 | official source | |
| Idaho Form 910 withholding payment (semimonthly filers) (monthly) Apr 2027 16th-end | official source | |
| Idaho Form 910 withholding payment (monthly filers) (monthly) Apr 2027 | official source | |
| Idaho Form 910 withholding payment (semimonthly filers) (monthly) May 2027 1st-15th | official source | |
| Idaho Form 910 withholding payment (semimonthly filers) (monthly) May 2027 16th-end | official source | |
| Idaho Form 910 withholding payment (monthly filers) (monthly) May 2027 | official source | |
| Idaho Form 910 withholding payment (semimonthly filers) (monthly) Jun 2027 1st-15th | official source | |
| Idaho Form 910 withholding payment (semimonthly filers) (monthly) Jun 2027 16th-end | official source | |
| Idaho Form 910 withholding payment (monthly filers) (monthly) Jun 2027 | official source | |
| Idaho Form 910 withholding payment (semimonthly filers) (monthly) Jul 2027 1st-15th | official source | |
| Idaho Form 910 withholding (quarterly filers) Q2 2027 | official source | |
| Idaho Form 910 withholding payment (semimonthly filers) (monthly) Jul 2027 16th-end | official source | |
| Idaho Form 910 withholding payment (monthly filers) (monthly) Jul 2027 | official source | |
| Idaho Form 910 withholding payment (semimonthly filers) (monthly) Aug 2027 1st-15th | official source | |
| Idaho Form 910 withholding payment (semimonthly filers) (monthly) Aug 2027 16th-end | official source | |
| Idaho Form 910 withholding payment (monthly filers) (monthly) Aug 2027 | official source | |
| Idaho Form 910 withholding payment (semimonthly filers) (monthly) Sep 2027 1st-15th | official source | |
| Idaho Form 910 withholding payment (semimonthly filers) (monthly) Sep 2027 16th-end | official source | |
| Idaho Form 910 withholding payment (monthly filers) (monthly) Sep 2027 | official source | |
| Idaho Form 910 withholding payment (semimonthly filers) (monthly) Oct 2027 1st-15th | official source |
Unemployment / reemployment
| Due | Deadline | Source |
|---|---|---|
| Idaho unemployment insurance report and payment Q3 2026 | official source | |
| Idaho unemployment insurance report and payment Q4 2026 | official source | |
| Idaho unemployment insurance report and payment Q1 2027 | official source | |
| Idaho unemployment insurance report and payment Q2 2027 | official source |
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