The estate tax is a levy on wealth transferred at death above a large exemption — and it is simultaneously over-feared and under-understood. Over-feared because the federal exemption exempts the vast majority of estates entirely; under-understood because the exemption is only one variable: what counts as the taxable estate (life insurance, retirement accounts, everything), how the unlimited spousal exemption and portability work, how a dozen state estate taxes apply at far lower thresholds, and how the step-up in basis quietly delivers a capital-gains exemption worth as much as the estate tax itself to many families. This complete US guide covers the mechanics plainly: the exemption and rate structure, what’s in and out of the taxable estate, spousal rules, the state layer, the step-up, the scheduled exemption changes, and the planning appropriate at each wealth band — connecting to the documents and structures in the estate planning guide and the beneficiary mechanics of the life insurance rules.
The Federal Estate Tax: Exemption, Rate, and Who Actually Pays
The structure is simple once the numbers are attached. The taxable estate is everything the deceased owned at death: home, investments, retirement accounts, business interests, collectibles, and — the perennial surprise — life insurance death benefits where the deceased owned the policy. From that total, deductions subtract debts, funeral and administration costs, charitable bequests, and everything passing to a surviving spouse. What remains above the exemption (over $13 million per person under current law) is taxed at 40%, with rates ramping to that level just above the threshold. The practical scope: a married couple with two estates can shield roughly $27 million; only a few thousand US estates per year owe any federal estate tax at all — but those that do face a bill measured in millions, which is why planning exists. The Internal Revenue Service’s estate tax materials at irs.gov carry the current figures and Form 706 mechanics.
The Spousal Rules: Unlimited Marital Deduction and Portability
Two US spousal provisions do most of the work in most estates. The unlimited marital deduction: everything passing to a US-citizen surviving spouse is fully deductible — no estate tax at the first death regardless of amount, which is why “I’m leaving it all to my spouse” plans generate no federal bill at death one. The portability election: when the first spouse dies, the executor can elect to transfer the deceased’s unused exemption to the surviving spouse — who can then apply both exemptions at the second death. Portability made the old “credit shelter trust” largely optional for federal purposes: a couple no longer needs trusts at death one purely to capture both exemptions, provided the survivor’s estate files correctly. The two caveats worth memorizing: portability is not automatic — it requires a timely filed estate tax return (Form 706) even when no tax is due, an executor detail US families miss constantly; and the non-citizen spouse wrinkle — transfers to a non-citizen spouse don’t qualify for the unlimited deduction without a special trust (QDOT), a genuine planning trap for internationally mixed US couples.
The State Layer: Lower Thresholds, Different Rules
| State Type | Examples | Threshold Range | Key Notes |
|---|---|---|---|
| State estate tax | NY, WA, IL, MA, OR, others | $1M–$13M (varies) | Applied before federal; some have “cliff” effects |
| Inheritance tax | PA, NJ (estate tax repealed), NE, IA, KY, MD | Tax on beneficiaries, not estate | Spouses usually exempt; rates vary by relationship |
| Both | MD | Combined systems | Rare; check current law |
| No death tax | FL, TX, CA, AZ, NV, most states | — | Federal exposure only |
The US state layer is where “my estate is under the exemption, so I’m fine” breaks down. A $2.5 million US estate pays zero federal tax but faces a real bill in Oregon ($1M threshold) or Massachusetts ($2M), and New York’s version has a cliff — exceeding the threshold by even a little can tax the entire estate, not just the excess. US inheritance taxes flip the structure, taxing recipients by relationship: children pay in Pennsylvania, siblings pay more, charities and spouses usually pay nothing. US retirees choosing a retirement state rightly weigh the state death-tax map alongside income and property taxes — a legitimate financial consideration at estate sizes that owe the feds nothing.
The Step-Up in Basis: The Quiet Giant
For many US families, the step-up is worth more than the estate tax they’ll never pay. Mechanics: appreciated assets inherited at death receive a new cost basis equal to date-of-death value — decades of embedded capital gains simply vanish, never taxed to anyone. The example that lands: a US grandparent’s $80,000 stock position from 1985, worth $2.2 million at death, passes with a $2.2 million basis; the heir sells tomorrow and owes zero capital gains tax — over $300,000 of liability erased by one rule. The step-up interacts with everything: it’s the reason holding low-basis assets until death beats gifting them during life (a gift carries the old basis; an inheritance steps up); it’s why tax-loss harvesting in old age can be counterproductive for assets earmarked for heirs (per the harvesting guide’s final-act caveat); and it’s a genuine offset to the estate tax for estates above the exemption — the 40% US levy arrives alongside, not on top of, the erasure of embedded gains. Current legislative proposals periodically target the step-up; any such US change would materially raise taxes on inherited wealth, which is why estate plans get reviewed when tax law moves.
What Counts: Life Insurance, Retirement Accounts, and the ILIT
The estate’s US edges surprise people. Life insurance: death benefits of policies the deceased owned (with the power to change beneficiaries or borrow) are included — a $5 million policy on a $10 million estate makes a $15 million taxable estate, pushing past thresholds families thought they were under. The fix is the ILIT (irrevocable life insurance trust): the trust owns the policy, the insured retains no incidents of ownership, and the proceeds sit outside both estates — funding liquidity instead of inflating the taxable base, per the ownership rules in the beneficiary guide. Retirement accounts: IRAs and 401(k)s are included at death (income-tax-deferred inside, but estate-taxable at value); the now-mandatory ten-year drain for most non-spouse heirs compresses the income-tax deferral that used to stretch generations — the “Secure Act” changes that reshaped US inherited-IRA planning. Homes and businesses: included at fair market value, often illiquid — the classic US estate-tax crisis is a farm or business owing tax on value the family can’t sell to pay; special-use valuations and deferral elections exist for exactly this, and liquidity planning (the ILIT again, or line-of-credit arrangements) is half of agricultural and small-business estate work.
Planning by Wealth Band
The right amount of US estate planning scales with the balance sheet. Under ~$1M net worth: no death taxes anywhere — the US plan is documents (will, beneficiaries, powers of attorney) and the net worth tracking that knows where everything stands; complexity beyond that is wasted money. $1M–$13M: federal exemption covers everything, but state estate taxes may not — the US plan adds state-threshold monitoring (especially before a move or as real estate and retirement balances grow), portability awareness at the first death, and beneficiary-form hygiene. $13M–$27M couples: the federal planning zone — portability or credit-shelter structures to capture both exemptions, lifetime gifting to move appreciation out of the estates (the annual exclusion, roughly $18–19K per donor per recipient, plus the medical/education exclusions for direct payments), ILITs for insurance, and valuation work for business interests. Above that: the full US toolkit — dynasty trusts, grantor-retained structures, charitable vehicles (per the DAF guide), family entities — professional territory where the planning fees are rounding errors against the tax saved. The meta-rule across all bands: the plan’s complexity should track the estate’s exposure, and both get revisited when law, assets, or family change.
The Scheduled Change and Why Timing Matters
Under current law, the elevated exemption is scheduled to sunset — reverting to roughly half its present level after 2025 unless extended. The planning consequence: estates that sit comfortably under a $13M+ exemption could face a ~$6–7M one, pulling tens of thousands of additional US households into the taxable range. For estates near the lower figure, the standard responses: accelerate lifetime gifting while the high exemption stands (gifts made under a big exemption stay gifted even if the law later shrinks — the “use it or lose it” logic that drove the 2025 gifting wave), lock in portability at any first death in the window, and review the plan annually rather than treating any threshold as permanent. US estate tax law has moved repeatedly across administrations; the durable approach treats the current numbers as a window, not a constant, and builds plans that degrade gracefully — documents correct, beneficiaries current, gifting capacity reviewed — whichever direction the law travels next.
A Worked Estate: Two Outcomes Compared
Concrete numbers ground the whole system. A typical US couple, second marriage for each, combined net worth $8 million: a home ($1.4M), retirement accounts ($2.6M), a taxable portfolio ($3M), and life insurance the husband owns outright ($1M). The unplanned path: everything passes by will and default rules; his $4M half (including the owned policy) uses no exemption structure at his death — fine federally, but they’re Washington residents, where the $2.2M state exemption is exceeded by $1.8M, generating roughly a $180,000 state bill his estate pays from the retirement account (triggering income tax on the distribution too, the double-hit that liquidity planning exists to prevent). The step-up still applies — the portfolio’s $2M of embedded gain erases — but the state bill and the forced liquidation were both avoidable. The planned path: the policy moves to an ILIT (out of both estates), annual-exclusion gifts to their combined five children shift $180,000+ per year out of the estates, the state exposure drops under the threshold within four years, and the first-death portability election preserves both federal exemptions against the scheduled sunset. Same family, same assets — roughly a quarter-million dollars of difference, plus the succession clarity that the documents work provides. This is the honest scale of US estate tax planning at moderate wealth: not exotic structures, but ownership placement, gifting cadence, and state awareness — the same discipline the decade-by-decade planning guide schedules as a recurring review item rather than a one-time event.
How the Estate Tax Return Actually Works
The procedural layer, briefly, because US executors inherit it. Form 706 is the federal estate tax return — due nine months after death, with a six-month extension available. Filing is required only when the gross estate exceeds the filing threshold, except when portability is desired: the portability election is made on a timely 706 even for estates owing nothing, which is why “we didn’t need to file” costs so many surviving spouses their late partner’s unused exemption. The return marshals date-of-death values for everything (professional appraisals for real estate, businesses, and unusual assets — valuations that the IRS can and does challenge, the audit territory of larger estates), applies the deductions, computes the tax, and schedules the payment — with deferral elections available for closely-held business interests whose value exceeds a third of the estate. State returns mirror the process where applicable, on their own deadlines. The executor’s practical checklist: hire the appraiser and the estate attorney early (the fees are deductible estate expenses), file the 706 for portability even when no tax is due, open the estate bank account to marshal assets, and sequence the liquidity: the tax is due in cash nine months out, which is the entire argument for life insurance and the ILIT structure in one sentence. The US families who navigate the paperwork smoothly are the ones whose planning included the paperwork choreography, not just the documents.
The mail we get
Does everyone’s estate pay estate tax?
No — over 99% of US estates pay zero federal estate tax, thanks to the $13M+ per-person exemption. State estate and inheritance taxes catch more estates at much lower thresholds, which is the layer most worth checking at moderate net worth.
Does life insurance count toward my taxable estate?
Usually yes — if you own the policy or retain the right to change beneficiaries, the death benefit is included. The standard fix is an irrevocable life insurance trust (ILIT) that owns the policy, keeping proceeds outside the taxable estate while still funding your family exactly as intended.
What is the step-up in basis?
Inherited assets get a new cost basis equal to their date-of-death value — so decades of embedded capital gains are never taxed. For many families this quietly erases more tax than the estate tax they never owed, and it’s why holding low-basis assets until death usually beats gifting them during life.
Can I just gift everything away before I die?
Partially. Annual-exclusion gifts (roughly $18–19K per recipient per year) and direct payments of tuition and medical costs move money tax-free; larger gifts use lifetime exemption. But gifts don’t get the step-up, and a “deathbed gift of everything” runs into the three-year lookback for certain transfers — gifting is a tool, not a loophole.
What happens to my 401(k) or IRA at death?
It’s included in the taxable estate at value, and your beneficiaries face the income tax on withdrawals — with most non-spouse heirs now required to drain inherited accounts within ten years. Spouses can roll to their own IRA; everyone else should plan the decade of distributions, since the tax drag is real and plannable.
One paragraph to remember
The federal estate tax touches very few; the state layer and the step-up touch almost everyone. Know your net worth, check your state’s threshold, count your life insurance, and capture the spousal rules correctly — the mechanics are few and they’re learnable.
Scale the plan to the balance sheet, revisit it when the law moves, and let the quiet giant — the step-up — do its work on whatever you leave behind.
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