Idaho Estimated Tax Payments
Quarterly estimated payment schedule for Idaho in 2026, with federal comparison.
Idaho State Tax Commission
https://tax.idaho.gov
Federal Schedule (Reference)
Federal Individual Estimated Payments (Form 1040-ES)
Apr 15, 2026
40 days awayJun 15, 2026
101 days awaySep 15, 2026
193 days awayJan 15, 2027
315 days awayIdaho Estimated Payment Schedule
Quarterly dates by entity type. Dates matching the federal schedule are noted.
individual
Apr 15, 2026
40 days awayJun 15, 2026
101 days awaySep 15, 2026
193 days awayJan 15, 2027
315 days awayMatches federal schedule
Sole Proprietorship
Apr 15, 2026
40 days awayJun 15, 2026
101 days awaySep 15, 2026
193 days awayJan 15, 2027
315 days awayMatches federal schedule
C Corporation
Apr 15, 2026
40 days awayJun 15, 2026
101 days awaySep 15, 2026
193 days awayDec 15, 2026
284 days awayFederal vs. Idaho Comparison
| Quarter | Federal | Idaho | Match? |
|---|---|---|---|
| Q1 | Apr 15, 2026 | Apr 15, 2026 | Same |
| Q2 | Jun 15, 2026 | Jun 15, 2026 | Same |
| Q3 | Sep 15, 2026 | Sep 15, 2026 | Same |
| Q4 | Jan 15, 2027 | Jan 15, 2027 | Same |
Entity Types Without State Estimated Payments
The following entity types do not have state-level estimated payment requirements listed for Idaho:
- Partnership — Calendar-year due date follows federal timing for pass-through entities.
- S Corporation — Calendar-year due date follows federal timing for pass-through entities.
- LLC — Calendar-year due date follows federal timing for pass-through entities.
- Nonprofit — Nonprofit annual return generally due the 15th day of the 5th month.
FAQ
Does Idaho require estimated tax payments?
Yes. Idaho requires estimated payments for individual, Sole Proprietorship, C Corporation.
Are Idaho estimated payment dates the same as federal?
Yes, Idaho follows the same quarterly schedule as the federal government for most entity types.
What form do I use for Idaho estimated payments?
Contact Idaho State Tax Commission at https://tax.idaho.gov for the correct estimated payment voucher and instructions.