When is the Idaho PTET election deadline?

ABE election made by checking the ABE box on a timely-filed Form 41S (S corp) or Form 65 (partnership). Tax due by 15th day of the 4th month after close of tax year (April 15 for calendar-year filers). Election is irrevocable for that tax year; entity may choose annually whether to make the election.

What is the Idaho PTET rate?

Idaho's PTET rate is 5.80% flat. [PLACEHOLDER: state DOR cite] — Idaho corporate rate is 5.8% for 2024; 2026 ABE rate to be re-pinned against tax.idaho.gov.

Is the Idaho owner credit refundable?

Idaho's PTET owner credit is refundable.

Does Idaho PTET affect composite-return filing?

Stacks. See the composite-vs-PTET page for the full matrix.

Idaho · ID

Idaho Pass-Through Entity Tax (PTET)

Idaho's PTET regime is one of the 37+ state workarounds to the federal SALT cap (IRC §164(b)(6)). The election is annual, statute-pinned below, and interacts with composite filing and §199A QBI in state-specific ways.

Statute: Idaho Code § 63-3026B (Affected Business Entity Election)
State DOR portal: https://tax.idaho.gov/taxes/income-tax/business-income/guides-for-certain-businesses/pass-through-entities/
Election deadline: ABE election made by checking the ABE box on a timely-filed Form 41S (S corp) or Form 65 (partnership). Tax due by 15th day of the 4th month after close of tax year (April 15 for calendar-year filers).
Election form: Form ABE (kept on file); Form ABE-ES (estimated tax voucher); PTE-12 (reporting)
Entity-level rate: 5.80% — [PLACEHOLDER: state DOR cite] — Idaho corporate rate is 5.8% for 2024; 2026 ABE rate to be re-pinned against tax.idaho.gov.
Eligible entities: s-corp, partnership, llc-as-s, llc-as-partnership
Owner credit: refundable
Composite interaction: stacks
§199A QBI base reduction: Yes — Reduces federal flow-through income (Notice 2020-75).
Last verified: 2026-05-11

Source: tax.idaho.gov pass-through-entities page + Form ABE EFO00330. Idaho calls it 'Affected Business Entity' (ABE) not 'PTET'.

IRC §164(b)(6)Notice 2020-75 IRC §199A

Reference computation

For a Idaho pass-through entity with $500,000 of qualified net income allocated to this state, at a 37% federal marginal bracket, the entity-level PTET and federal-deduction math is:

Idaho — reference example

QBI allocation·ID rate= Entity-level tax

$500,000×6%=$29,000

Idaho Code § 63-3026B (Affected Business Entity Election)

Entity tax·Federal bracket= Federal deduction (gross)

$29,000×37%=$10,730

At a 37% federal bracket, the entity-level deduction saves $10,730 in federal tax. Net of §199A QBI offset (~20% × bracket × entity tax = $2,146), aggregate benefit is approximately $8,584.

IRS Notice 2020-75

Run the picker pre-filled for Idaho

Election walkthrough

Verify eligibility. Idaho accepts: s-corp, partnership, llc-as-s, llc-as-partnership.
Check the deadline. ABE election made by checking the ABE box on a timely-filed Form 41S (S corp) or Form 65 (partnership). Tax due by 15th day of the 4th month after close of tax year (April 15 for calendar-year filers). Election is irrevocable for that tax year; entity may choose annually whether to make the election.
Compute the entity-level tax. Apply the 5.80% rate to qualified net income.
Pay and file. Use Form ABE (kept on file); Form ABE-ES (estimated tax voucher); PTE-12 (reporting). Quarterly estimates may be required.
Owners claim the state credit. refundable credit on the personal state return.
Verify composite interaction. Composite interaction: stacks. See composite vs PTET.
Run the federal §199A QBI math. PTET reduces the QBI base proportionally; net the federal SALT-arbitrage against the §199A offset.

Idaho PTET — common questions

Annual deadline reminder

State PTET law revises annually. Idaho's data was last verified on 2026-05-11. Re-confirm with the state DOR primary source before electing or filing. Last full-site review: 2026-05-12.