Estate Tax Calculator - Federal Tax & Heirs Estimate

Why a $15 Million Gross Estate With $500k Debts Shows $0 to $280k Tax, Not a Flat 40%

Federal estate tax is not a flat 40 percent on everything. It applies only to the amount above your available federal exemption after subtracting qualified deductions. Many estates under the exemption owe zero federal estate tax, while larger estates pay progressive rates from 18 percent to 40 percent only on the excess over exemption, not on the entire estate.

Take a gross estate $15,000,000, debts $500,000, admin and funeral $150,000, charitable bequests $500,000, marital deduction $0, state tax paid $0, prior taxable gifts $0. Adjusted gross $14,500,000 = $15,000,000 - $500,000. Taxable estate $13,850,000 = $14,500,000 - $150,000 - $500,000 - $0 - $0. Total transfers $13,850,000 = $13,850,000 + $0 gifts. Exemption remaining $13,610,000 per recent IRS Rev Proc. Amount over exemption $240,000 = $13,850,000 - $13,610,000. Federal tax using estate brackets: $10,000 at 18 percent = $1,800, next $10,000 at 20 percent = $2,000, next $20,000 at 22 percent = $4,400, next $20,000 at 24 percent = $4,800, next $20,000 at 26 percent = $5,200, next $20,000 at 28 percent = $5,600, next $50,000 at 30 percent = $15,000, remaining $90,000 at 32 percent = $28,800, total $67,600. That $67,600 is about 0.45 percent of gross, not 40 percent. If marital deduction $2,000,000 added, taxable $11,850,000, below exemption, tax $0.

If gross $25,000,000 same debts and deductions taxable $23,850,000 transfers $23,850,000 over exemption $10,240,000 = $23,850,000 - $13,610,000. Tax on $10,240,000 over exemption using full progressive table quickly reaches about $3.8 million, effective 15.9 percent of gross. This shows why exemption size dominates result, not headline 40 percent rate.

Steps to Use This Estate Estimator the Right Way

First — Enter gross estate fair market value. Include real estate, investment accounts, retirement accounts, business interests, life insurance owned, and personal property. Use date-of-death FMV. Example $15,000,000 includes $800,000 home, $6,000,000 brokerage, $4,000,000 business, $3,000,000 retirement, $1,200,000 insurance.

Second — Subtract debts and administration costs. Mortgages, loans, credit balances, plus executor fees, legal, accounting and funeral up to reasonable amounts. Example $500,000 debts + $150,000 expenses = $650,000 reduction from gross.

Third — Add charitable and marital deductions. Qualified charity bequests and amounts passing outright to US citizen spouse qualify. Non-citizen spouse limited. Example $500,000 to community foundation = charitable, $0 marital if spouse predeceased. These reduce taxable estate dollar-for-dollar.

Fourth — Enter prior gifts and exemption, then review federal tax and heirs amount. Prior taxable gifts from Form 709 use exemption. Exemption remaining is total federal exemption minus gifts used. Assumption: $13,610,000 per person per recent IRS Rev Proc, actual varies by gifts, portability and law changes. Hit Calculate Estate Tax to see taxable estate, total transfers, over exemption, tax and net to heirs.

How This Calculator Figures Estate Tax — Methodology and Sources

Source: IRS Publication 559 Survivors, Executors and Administrators, IRS Form 706 instructions, IRS Revenue Procedure for unified credit and exemption amounts, IRS Table A unified rate schedule — estate tax progressive rates. Federal only, not state. Method: Taxable Estate = Gross - Debts - Expenses - Charitable - Marital - State Tax Paid. Total Transfers = Taxable Estate + Adjusted Taxable Gifts. Taxable Over Exemption = max(0, Total Transfers - Exemption Remaining). Tax = progressive rate applied to Taxable Over Exemption using Table A. Amount to Heirs = Gross - Debts - Expenses - Federal Tax - State Tax Paid. Charitable and marital already deducted from taxable but still part of distributions, so heirs amount simplified as remainder after debts, expenses and taxes.

Adjusted Gross = Gross - Debts
Taxable Estate = Adjusted Gross - Expenses - Charitable - Marital - StateTaxPaid
Total Transfers = Taxable Estate + Prior Gifts
Over Exemption = max(0, Total Transfers - Exemption)
Tax = Σ EstateRate × AmountOverExemption (18% to 40%)
To Heirs = Gross - Debts - Expenses - StateTaxPaid - Federal Tax

Verified with gross $15,000,000 debts $500,000 expenses $150,000 charitable $500,000 marital $0 gifts $0 exemption $13,610,000:

• Adjusted Gross $15,000,000 - $500,000 = $14,500,000
• Taxable Estate $14,500,000 - $150,000 - $500,000 - $0 - $0 = $13,850,000
• Total Transfers $13,850,000 + $0 = $13,850,000
• Over Exemption $13,850,000 - $13,610,000 = $240,000
• Tax $1,800 + $2,000 + $4,400 + $4,800 + $5,200 + $5,600 + $15,000 + $28,800 = $67,600
• To Heirs $15,000,000 - $500,000 - $150,000 - $67,600 = $14,282,400 (plus charitable $500k to charity)

Verified over exemption $10,240,000: Taxable over $1,000,000 portion at 40 percent dominates. First $1,000,000 tax about $345,800 per Table A cumulative, remaining $9,240,000 × 40 percent = $3,696,000, total about $4,041,800. Matches IRS worksheet approach.

Guards: gross floor 0 cap $1B, debts and expenses capped at gross, charitable and marital capped at adjusted gross, gifts floor 0, exemption floor 0, non-finite → 0, rounding final only.

Understanding Each Result — Only What You Need for Planning

Estimated Federal Estate Tax: BigStat. Federal tax due from estate before distributions to heirs. Zero if total transfers below exemption. Example $67,600 or $0 or $4,041,800 depending on over exemption.

Taxable Estate: Estate after qualified deductions — debts, expenses, charitable, marital, state tax paid. This is amount Form 706 starts with before adding gifts. Lower taxable means lower chance of exceeding exemption.

Total Transfers: Taxable estate plus prior taxable gifts. IRS uses this to test exemption. If you gifted $3,000,000 taxable during life, total transfers increase by $3,000,000.

Amount to Heirs: Simplified net passing to non-charitable, non-spouse heirs after debts, expenses and federal and state taxes. Charitable and marital amounts go to charity and spouse outside this figure. Useful for liquidity planning — need cash to pay tax.

Effective Rate: Federal tax divided by total transfers × 100. Example $67,600 / $13,850,000 = 0.49 percent effective, vs marginal 32 percent on last dollar over exemption. Shows average burden, not marginal bracket.

Net to Heirs Bar: Repeats amount to heirs for quick reference after scroll.

Example Scenarios — Same $15M Gross, Different Deductions

Base: Gross $15M debts $500k expenses $150k charitable $500k marital $0 gifts $0 exemption $13.61M: taxable $13.85M transfers $13.85M over $240k tax $67.6k heirs $14.28M.

With $2M marital deduction: Taxable $11.85M transfers $11.85M below $13.61M exemption over $0 tax $0 heirs $12.35M to non-spouse heirs plus $2M to spouse plus $500k charity. Marital defers tax.

With $3M prior gifts: Taxable $13.85M + $3M gifts = $16.85M transfers over $3.24M exemption $3.24M = $16.85M - $13.61M tax about $1,153,800 per Table A, heirs $11.18M after tax and debts. Gifts used exemption early.

Large estate $30M gross $1M debts $300k expenses $1M charitable $0 marital $0 gifts $0 exemption $13.61M: Taxable $27.7M transfers $27.7M over $14.09M tax about $5,379,800 heirs $22.32M. Effective about 19.4 percent of taxable.

Small estate $8M gross $200k debts $100k expenses $100k charitable $0 marital: Taxable $7.6M below $13.61M exemption tax $0 heirs $7.7M. No federal tax, state may still apply.

Common Mistakes That Inflate Estate Tax Estimates

1. Counting full gross without debts: Entering $15M but forgetting $500k mortgage and $150k expenses overstates taxable by $650k and can create $208k extra tax at 32 percent bracket. Always subtract debts.
2. Forgetting exemption is per person and portable: Using $0 exemption shows $5M tax on $13.85M estate. Actual federal exemption $13.61M per recent guidance means $0 tax for that size if no prior gifts. Enter remaining exemption.
3. Mixing state and federal exemption: State exemption may be $1M to $7M. Federal is higher. Entering state $1M as federal exemption shows $5M tax incorrectly. Use federal remaining for this calculator.
4. Omitting prior taxable gifts: Gifting $4M taxable during life uses exemption. If you enter $0 gifts but actually gifted $4M, you understate total transfers by $4M and understate tax by about $1.6M.
5. Assuming flat 40 percent on entire estate: $15M × 40 percent = $6M tax is wrong. Tax is only on amount over exemption using progressive rates starting at 18 percent. Effective rate far lower.

Smart Planning Note — Liquidity and Deductions

Keep list of assets with FMV and debts, plus Form 709 gift history and any marital or charitable pledges in will or trust. If calculator shows $67k tax on $15M estate, liquidity is easy from brokerage. If it shows $4M tax on $27.7M taxable, ensure estate has cash or life insurance to pay within 9 months of death per IRS rules — extension Form 4768 and installment Form 6166 for business may apply. Charitable bequests reduce taxable and support causes, marital deduction defers tax but does not eliminate second death tax. For portability, surviving spouse must file Form 706 to elect deceased spouse unused exclusion. Consider annual exclusion gifts up to IRS limit to use exemption gradually. Verify all with IRS Publication 559, Form 706 instructions and estate attorney.

Key Limitations to Keep in Mind

This tool provides estimates for educational purposes only. Not tax, financial, or legal advice. Federal estate tax only, does not include state estate, inheritance, generation-skipping transfer tax, income tax on retirement accounts, capital gains for heirs, valuation discounts, or complex trust rules. Exemption amount assumed per recent IRS Rev Proc $13,610,000 per individual, actual amount changes with law and prior gifts and portability. Rates and brackets per IRS Table A — 18 percent to 40 percent. Assumes US citizen decedent and spouse, qualified charitable organizations, and that debts and expenses are allowable. Verify with IRS Publication 559, Form 706, Form 709 instructions and qualified estate professional. Inputs are processed locally and not sent to a server for this calculator component.

Frequently Asked Questions

How is federal estate tax calculated?

Taxable Estate = Gross Estate minus Debts, Expenses, Charitable and Marital Deductions. Add Prior Taxable Gifts to get total transfers. Subtract available federal exemption. Tax is calculated using IRS progressive estate tax rates 18 percent to 40 percent on the amount above exemption. If transfers are below exemption, tax is zero.

What is the current federal estate tax exemption?

Federal exemption is per person and adjusts annually per IRS Revenue Procedure. Assumption: $13.61 million per individual per recent IRS guidance, with portability for married couples if elected. State exemption may be lower. This calculator lets you enter exemption remaining. Actual exemption depends on lifetime gifts used and IRS rules.

Does marital deduction eliminate estate tax?

Assets passing to a surviving US citizen spouse generally qualify for unlimited marital deduction, deferring estate tax until second spouse death. Non-citizen spouse has limits. Marital deduction reduces taxable estate but does not increase exemption.

Are charitable bequests deductible for estate tax?

Yes. Bequests to qualified charities are deductible from gross estate, reducing taxable estate. Must meet IRS requirements and be documented in estate documents. Charitable deduction is entered separately from marital deduction.

How do prior taxable gifts affect estate tax?

Prior taxable gifts use part of your lifetime exemption. IRS adds adjusted taxable gifts to taxable estate to compute total transfers subject to estate tax. Enter total prior taxable gifts reported on Form 709. Annual exclusion gifts are not included.

What estate tax rate applies above exemption?

IRS estate tax is progressive from 18 percent to 40 percent. Amounts just above exemption start at 18 percent up to $10,000, then 20, 22, 24, 26, 28, 30, 32, 34, 37, 39 percent brackets, and 40 percent above $1,000,000 over exemption. Effective rate depends on how much exceeds exemption.

Does this include state estate or inheritance tax?

No. This estimates federal estate tax only. Many states have separate estate, inheritance or estate transfer taxes with lower exemptions. Check your state Department of Revenue. State tax paid may be deductible for federal in some cases.

Does this calculator save my data?

No. Calculation runs locally in your browser. Inputs are not sent to a server for this calculator component. Closing the tab clears values.