Estate Tax

Estimating Federal Estate Tax Liability

The federal estate tax only applies to the portion of an estate’s value above a large exemption amount — most estates never owe it at all. Enter the total estate value and the current federal exemption amount, and this calculator estimates the tax owed and what heirs would actually receive.

The exemption amount is set by federal law and adjusted for inflation, and it changes often enough through legislation that this calculator treats it as a plain, editable input rather than a fixed fact — always verify the current exemption amount against the IRS’s own published figures before relying on this estimate, since the number used here may not reflect the current tax year.

The Formula

$$\text{Estate Tax Owed} = \max(0, \vA{\text{Estate Value}} - \vB{\text{Exemption Amount}}) \times 40\%$$

The real federal estate tax technically uses a graduated bracket structure, but because the exemption amount is so large, any estate that owes federal tax at all has already cleared the brackets’ own threshold for the top 40% rate — so in practice, the amount above the exemption is taxed at a flat 40%. This is the same simplification most public estate-tax estimates use.

Worked Example

A $2,000,000 estate with a $15,000,000 exemption — a realistic scenario for a financially comfortable household, not just the ultra-wealthy:

1. Taxable estate: max(0, $2,000,000 − $15,000,000) = $0 — the estate’s entire value falls well under the exemption, so nothing is taxable.
2. Estate tax owed: $0 × 40% = $0.
3. Net to heirs: $2,000,000 − $0 = $2,000,000 — the full estate passes to heirs, since it never crossed the exemption threshold in the first place.

A larger estate that does cross the exemption looks different: a $20,000,000 estate against the same $15,000,000 exemption owes tax on the $5,000,000 above it — $5,000,000 × 40% = $2,000,000 owed, leaving $18,000,000 net to heirs.

Key Factors to Consider

• The federal exemption amount is legislated and can change significantly. Estate tax exemption levels have been raised and lowered by different pieces of legislation over the years — the current $15,000,000 (2026) level was made permanent by 2025 legislation with no scheduled future reduction, but a permanent law can still be changed by a later one, so always check the current law rather than assuming today’s exemption will apply indefinitely.
• Estate planning tools like trusts can legally reduce a taxable estate before this calculation even applies. Various trust structures and gifting strategies are commonly used specifically to move assets out of a taxable estate during a person’s lifetime — this calculator estimates tax on a raw estate value, not the more complex, often lower liability after estate planning.
• The “gross estate” for tax purposes can include more than what most people think of as their estate. Life insurance proceeds (if the deceased owned the policy), certain retirement accounts, and jointly-held property can all factor into the gross estate value used for this calculation, not just cash, real estate, and investments held solely in the deceased’s name.
• This is a complex area where professional guidance is genuinely valuable, not just a formality. Estate tax planning intersects with trusts, gifting strategy, portability elections, and state law — for any estate near or above the exemption threshold, working with an estate planning attorney or tax professional is worth the cost given what’s at stake.

Common Mistakes

• Assuming an estate’s value is only its cash, real estate, and named investments. As covered above, the gross estate used for this calculation can also include life insurance proceeds (if the deceased owned the policy), certain retirement accounts, and jointly-held property — overlooking these can lead to a significant underestimate.
• Using an outdated or assumed exemption figure. As noted above, the exemption amount changes through legislation and annual inflation indexing — always verify the current figure against the IRS’s own published amount rather than trusting a remembered or default number.
• Forgetting that a surviving spouse may be able to use portability. If the first spouse to die doesn’t use their full exemption, the unused portion can often carry over to the surviving spouse’s own estate with the right election — this calculator estimates a single estate in isolation and doesn’t model that combined exemption.
• Skipping estate planning entirely for an estate near the threshold. As mentioned above, trusts and gifting strategies are commonly used specifically to legally reduce a taxable estate during a person’s lifetime — this calculator’s estimate reflects a raw estate value with none of that planning applied.

Useful to Know

• State estate or inheritance taxes are calculated separately from the federal tax this calculator estimates, and many states set their own exemption far lower than the federal amount — an estate that owes nothing federally could still owe state tax.
• The federal exemption amount has moved substantially over the years through different pieces of legislation, and even a “permanent” law (like the current $15,000,000 level) can be changed by a later one — don’t assume today’s exemption will hold indefinitely.
• Since estate tax planning often intersects with retirement accounts, pairing this calculator with the Retirement / 401(k) Savings Calculator and Roth vs. Traditional IRA Calculator calculators can help build a fuller picture of how assets are likely to be distributed and taxed.