Every state taxes investors differently. Here is how Idaho treats capital gains at the top rate, the marriage penalty, estate and inheritance tax at death, municipal-bond interest, the §1202 QSBS exclusion, and a harvested loss, a plain reference to the state's tax code.
~$41,000/yr per $1M taxable
What tax-aware portfolio management alone is worth in Idaho about +4.1%/yr modeled: ~5.8%/yr kept after tax against ~1.8%/yr on a concentrated book. Scales with the portfolio.
This is the floor. It counts the portfolio only and leaves the estate, gifting, and residency coordination at zero, where the larger opportunities usually sit. Illustrative and hypothetical, not a track record: a model applied retroactively to ~30 years of proxy-spliced data, no client capital invested.
Idaho taxes long-term gains at a top effective 5.3%; no state death tax; community-property step-up (a full basis step-up at the first death).
How to think about Idaho
One of the five lenses reads high or severe in Idaho: basis coordination.
Five lenses turn Idaho's tax environment into a household decision, the same lenses every state is read through, so any two states weigh on identical terms.
Rate pressure
The state takes 5.3% of every long-term gain at the top, moderate drag on what a realized return keeps.
Estate exposure
No state estate or inheritance tax, only the federal estate tax reaches the estate.
Harvesting leverage
A harvested loss is worth the 5.3% state rate it offsets, on top of federal, moderate harvesting leverage.
Mobility value
The rate makes a change of residency worth modelling against the life and family cost of moving.
Basis coordination
Community-property state: community assets get a FULL step-up at the first death, title them so the survivor keeps that basis.
Coordination priorities for Idaho households
Residency & domicile· with your advisor + CPA
Whether, and how, a change of domicile is worth pursuing, and the facts (days, home, ties) that make it real rather than nominal.
Asset titling for step-up· with your estate attorney
Titling assets to capture the fullest basis step-up the marital-property regime allows at the first death.
Loss harvesting· with your advisor + CPA
Setting a harvesting cadence that captures the state rate a banked loss offsets, sequenced against the state's loss-carryforward rules.
Asset location· with your advisor
Placing the high-turnover sleeve in tax-advantaged accounts so the state's rate falls on the least of the household's realized gains.
What should happen next
advisorAsk for this year's after-tax result on the current holdings in Idaho, set beside the same holdings in a no-income-tax state, and for the list of facts a state examines when it tests domicile. Both are inputs to a decision rather than the decision.Bring: Last year's full return, and a current statement for each account.
estate attorneyAsk how each taxable account is titled today, and what Idaho law does to basis at a first death for that form of ownership. Titling is recorded on custodial paperwork, so this is a document check rather than an opinion.Bring: The registration page of each taxable account.
advisorAsk when losses were last harvested in the taxable book, and what loss carryforward is on file. Idaho taxes long-term gains at a top effective 5.3%, which is the figure that answer has to be read against.Bring: This year's realized gain and loss report, and last year's Schedule D.
advisorAsk which holdings sit in taxable accounts and which sit in tax-deferred ones today, and what turnover each produces. Placement cannot be assessed until both lists are on one page, including the accounts nobody currently manages.Bring: A position list for every account, including the ones held elsewhere.
See the figure on your own Idaho portfolio.
The personalized diagnostic computes your after-tax, asset-location, and harvesting picture, by bracket and holdings.
For a CPA, attorney, or advisor: the
Idaho coordination brief is a printable summary of this
page, written to be sent to a client as it stands. It asks the reader for nothing and names no
household.
The rules themselves
Income & gains5.3%
How are capital gains taxed in Idaho?
Loss treatment conforms to federal: capital losses net against gains and carry forward. Top effective long-term rate 5.3%.
Summary of state law, primary-source citation in progress. State revenue departments, tax year 2025, verify with a tax advisor.
Marriageflat
Is there a marriage penalty in Idaho?
A single flat rate regardless of filing status, marriage-neutral on rate; watch fixed-dollar exemptions and AGI thresholds.
Summary of state law, primary-source citation in progress. State income-tax filing schedules, tax year 2025, verify with a tax advisor.
Death
Does Idaho have a state estate or inheritance tax?
No state estate or inheritance tax, only the federal estate tax applies.
Summary of state law, primary-source citation in progress. State estate/inheritance statutes, tax year 2025, confirm with counsel.
Munisin-state
How does Idaho tax municipal-bond interest?
Only in-state municipal-bond interest escapes state tax; bonds from other states are taxed. The classic in-state muni preference that rewards a home-state ladder.
Summary of state law, primary-source citation in progress. State income-tax statutes on municipal-bond interest, tax year 2025, verify with a tax advisor.
QSBS§1202 ok
Does Idaho follow the federal QSBS (§1202) exclusion?
Conforms to IRC §1202, the federal qualified small business stock gain exclusion carries through to the state return.
Summary of state law, primary-source citation in progress. State IRC-conformity statutes on §1202, tax year 2025, verify with a tax advisor.
Lossesfederal
What happens to a capital loss you carry forward in Idaho?
Capital losses carry forward under the federal Section 1212 rules, a harvested loss nets against gains and rolls forward until used.
Summary of state law, primary-source citation in progress. State capital-loss carryforward rules, tax year 2025, verify with a tax advisor.
Basis step-upCP
Community-property state: BOTH halves of community property step up to fair market value at the first spouse's death (IRC 1014(b)(6)), a major basis advantage.
Summary of state law, primary-source citation in progress. State marital-property law / IRS Pub. 555; IRC 1014, verify with counsel.
What careful tax management can change
Tax law is only half the picture. How a portfolio is
built and run, where each holding sits, how losses are used, how gains are timed, decides how
much of Idaho's tax code you actually pay. The figure at the top of this page is what
that difference is worth in Idaho; these are the levers behind it.
Modeled on a single proxy-spliced path, 1996 to 2026.
Directional, not a precise figure.
Asset location
The bridge between how you invest and how the household is structured, placing the higher-turnover strategy in Roth and Traditional accounts, where its short-term gains escape tax entirely. Coordination itself; quantified for each household in the After-Tax Lab.
Patient trading and lot selection
Holds positions through short-term noise and chooses which lots to sell, turning gains that would be taxed as ordinary income into long-term gains taxed roughly 17 points lower.
Loss harvesting
Realizes losses and applies them against the highest-taxed gains first, capturing a spread a simple buy-and-hold fund never reaches.
We will email you the Tax Diagnostic set to Idaho, straight away, and follow up personally within a business day. One message, no list, and we never share your address.
State law reflects 2025 tax-year law; last reviewed 2026-07-07. Every classification is a summary of state law; where a primary-source citation has been verified, it is linked on the card.
What changed
2026-07-07, First law-review date and honest per-cell source labeling; primary-source citations verified for Illinois, California, New York, Texas, and Florida (more in progress).
2025, Washington's 7% (+2.9%) excise on long-term capital gains reflected (enacted 2022).
2025, New Hampshire's Interest & Dividends tax reflected as fully repealed, effective 2025.
2025, Illinois estate-tax detail tracks the pending SB 2970 as of the review date.
Illustrative / hypothetical, not a real track record and not advice. The tax-management impact figure is a hypothetical, after-tax result from the retroactive application of a tax-management model to ~30 years of proxy-spliced market data on a single illustrative path; no client capital was invested, and hypothetical performance does not guarantee future results. Intended for sophisticated investors; it may not be relevant to your situation, and your actual figure depends on your own holdings, basis, and bracket. State tax facts reflect tax year 2025 and can change, confirm with a tax advisor. Driftwood Wealth is the private-wealth practice of Alec Messino. Securities products and advisory services offered through Park Avenue Securities LLC (PAS), member FINRA, SIPC. Alec Messino is a Registered Representative and Financial Advisor of PAS. Driftwood Wealth is not an affiliate or subsidiary of PAS. All figures are illustrative models for educational purposes, not investment, tax, or legal advice, and not a recommendation.