Idaho Retirement Income Deduction Explained — 55+ Buyer Guide 2026

What Most Buyers Get Wrong About Idaho Income Tax

Idaho has a 5.8% flat income tax rate. When buyers from California, Washington, or Oregon see that number, they often assume Idaho is a higher-tax state than Nevada (zero) or Washington (zero). This is incorrect for most retirees, and the misunderstanding costs buyers who would otherwise be strong Idaho candidates.

The reason: Idaho provides a retirement income deduction of $47,935 per person (or $95,870 for a married couple filing jointly) for taxpayers who are 65 or older. This deduction applies to qualifying retirement income — IRA distributions, 401(k) withdrawals, pension income, and annuity income. Social Security is separately exempt from Idaho income tax at all income levels, regardless of the retirement income deduction.

The math for a typical retired coupleCouple age 67 and 65. Annual income: $55,000 from IRA distributions + $38,000 combined Social Security. Total income: $93,000. Idaho taxable income after deductions: $55,000 IRA — $95,870 deduction = $0. Social Security: $0 (exempt). Idaho income tax: $0. This couple pays zero Idaho state income tax despite Idaho having a 5.8% rate.

What the Deduction Covers — and What It Does Not

Covered by the retirement income deduction:

IRA distributions (traditional IRA). 401(k) and 403(b) withdrawals. Pension income from qualified plans. Annuity income from qualified plans. Qualifying disability income if over 65.

Separately exempt (not counted against the deduction):

Social Security benefits — all Social Security income is exempt from Idaho income tax regardless of total income. This exemption is not part of the $95,870 deduction — it is separate and applies even to buyers above the deduction threshold.

Not covered — taxed at 5.8% above the deduction threshold:

Non-qualified investment account income (dividends, interest, capital gains above the deduction). Roth IRA distributions (note: these are generally tax-free anyway as a return of after-tax contributions). Wages and self-employment income if you continue working.

Income scenarios — Idaho tax result

Couple, $55K IRA + $38K SS = $93K total$0 Idaho tax

Couple, $80K IRA + $40K SS = $120K total$0 Idaho tax (IRA under $95,870 threshold)

Couple, $120K IRA + $45K SS = $165K total~$1,398 Idaho tax ($120K − $95,870 = $24,130 × 5.8%)

Couple, $200K IRA + $50K SS = $250K total~$6,029 Idaho tax ($200K − $95,870 = $104,130 × 5.8%)

Idaho vs Nevada, Washington, and Tennessee

Nevada and Washington have zero income tax — no rate, no deduction, no calculation. Idaho has 5.8% but the retirement income deduction means most retirees pay zero. The practical difference for couples drawing under $95,870 in qualifying retirement income is identical. The difference emerges for buyers with higher retirement income draws.

Tennessee eliminated its Hall Tax in 2021 and now has zero income tax like Nevada and Washington. For Tennessee buyers and Idaho buyers drawing under $95,870 in retirement income, the income tax outcome is the same. For buyers above that threshold, Tennessee’s zero is structurally cleaner. The offset for Idaho: Idaho’s property tax rates are comparable to Tennessee’s, and Idaho’s homestead exemption provides immediate benefit without Tennessee’s annual reapplication requirement.

Idaho vs CA/NV/OR/WA Full Comparison →Ada County Tax Guide →Boise Community Guide →

How to Claim the Deduction

Establish Idaho residencyYou must be an Idaho resident to claim the deduction. File a change of domicile, update your driver’s license, register to vote, and update financial accounts.

File Idaho Form 40Idaho’s individual income tax return. The retirement income deduction appears on Schedule IDCG (Idaho Capital Gains Deduction) — but for the retirement income deduction specifically, it is claimed as an adjustment on Form 40.

Document qualifying income sourcesKeep 1099-R forms for all IRA and pension distributions. Social Security income is documented on SSA-1099 — you will not need this for Idaho since SS is exempt, but keep it for federal return purposes.

Consult a CPA familiar with Idaho tax lawThe deduction rules have nuances for specific income types, part-year residency, and income above the threshold. A CPA who works with Idaho retirees is worth the cost in the first year of residency.

Idaho Retirement Income Deduction — Complete Guide

What Most Buyers Get Wrong About Idaho Income Tax

What the Deduction Covers — and What It Does Not

Covered by the retirement income deduction:

Separately exempt (not counted against the deduction):

Not covered — taxed at 5.8% above the deduction threshold:

Income scenarios — Idaho tax result

Idaho vs Nevada, Washington, and Tennessee

How to Claim the Deduction

Run Your Idaho Income Tax Estimate