Estate Tax Deduction Guide – Estate tax deductions can significantly lower or eliminate your federal estate tax bill. This comprehensive guide explains everything U.S. residents need to know about estate tax deductions in 2026, including current exemptions, allowable deductions, filing requirements, and smart planning strategies. Whether you’re updating your estate plan or helping a loved one, understanding these rules helps protect your wealth for future generations.
What Is the Federal Estate Tax?
The federal estate tax is a tax on the transfer of property at death. It applies to the fair market value of everything you own or have an interest in at the time of death—including cash, securities, real estate, life insurance, trusts, annuities, and business interests. This total is your gross estate.
After subtracting allowable deductions, you arrive at the taxable estate. Lifetime taxable gifts (after 1976) are added back, and the tax is calculated using the unified rate schedule. Only estates exceeding the exemption pay tax—at a top marginal rate of 40%.
Most estates never owe federal estate tax thanks to generous exemptions and deductions.
2026 Federal Estate Tax Exemption and Rates
For decedents dying in 2026, the basic exclusion amount (exemption) is $15,000,000 per individual—up from $13.99 million in 2025. Married couples can effectively shield up to $30 million through portability of the unused exclusion.
The One, Big, Beautiful Bill (OBBB), signed July 4, 2025, made this higher exemption permanent (with annual inflation adjustments starting in 2027). The annual gift tax exclusion remains $19,000 per recipient in 2026.
The tax rate on amounts above the exemption is 40%. This unified credit effectively eliminates tax for estates below the threshold.
Who Must File IRS Form 706?
File Form 706 (United States Estate (and Generation-Skipping Transfer) Tax Return) if the gross estate plus adjusted taxable gifts exceeds the 2026 filing threshold of $15,000,000. Even if no tax is due, filing allows the surviving spouse to claim portability of the deceased spouse’s unused exclusion (DSUE).
The return is generally due 9 months after the date of death (extensions possible). Use the latest Form 706 and instructions from IRS.gov.
How to Calculate Your Gross Estate?
Start with the fair market value (FMV) of all assets at death (or alternate valuation date, if elected). Key inclusions:
- Real estate and personal property
- Stocks, bonds, and bank accounts
- Life insurance proceeds (if you owned the policy)
- Jointly owned property (with rules for spousal ownership)
- Retirement accounts and annuities
- Business interests and certain transfers made during life
Accurate appraisals are essential—especially for real estate, businesses, and collectibles.
Key Estate Tax Deductions: Complete 2026 List
Deductions reduce the gross estate to the taxable estate. Here are the primary ones available under current IRS rules:
Marital Deduction
The unlimited marital deduction lets you deduct the full value of qualifying property passing to a surviving U.S. citizen spouse. This includes outright bequests, QTIP trusts, and certain life estates. It can eliminate federal estate tax entirely for married couples.
Charitable Deduction
Bequests to qualified U.S. charities, public organizations, or similar entities are fully deductible. Use Schedule O of Form 706. Proper documentation and valuation are required.
Funeral Expenses and Estate Administration Costs
Deduct reasonable funeral costs, executor commissions, attorney fees, accountant fees, and other necessary administration expenses on Schedule J. These must be actually incurred or agreed upon and paid from the estate.
Debts, Mortgages, and Liens
Deduct outstanding debts of the decedent, mortgages, liens, and enforceable claims against the estate on Schedule K. Include credit card balances, loans, unpaid taxes, and medical bills.
Losses During Administration and Certain Expenses
Claim net losses from casualties/theft and expenses for administering property not subject to claims on Schedule L.
Special Valuation Reductions
Qualifying farms or closely held businesses may qualify for special use valuation or other reductions, lowering the reported value of those assets.
Other Credits and Adjustments
- Credit for foreign death taxes (Schedule P)
- Credit for tax on prior transfers (Schedule Q)
- State death tax deduction (if applicable)
All deductions require thorough documentation and must be substantiated on the return.
Step-by-Step: Computing Your Taxable Estate and Estate Tax Liability
- Determine gross estate value (FMV at death).
- Subtract allowable deductions (Schedules J, K, L, M, O, etc.).
- Add back adjusted taxable gifts made after 1976.
- Apply the unified credit based on the $15 million exclusion.
- Calculate tentative tax using the rate schedule.
- Subtract any available credits.
- Pay any remaining tax (or elect installment payments under Section 6166 for businesses/farms).
Use IRS Form 706 and its instructions for precise calculations.
State Estate and Inheritance Taxes: Don’t Overlook These
While the federal exemption is high, 12 states plus the District of Columbia impose their own estate or inheritance taxes with much lower thresholds in 2026. Examples include:
- Connecticut: $15 million
- Hawaii: ~$5.49 million
- Illinois: $4 million
- New York: ~$7.35 million
- Others like Maryland, Massachusetts, Minnesota, Oregon, Washington, etc., with thresholds from $1 million to $7 million.
Some states have inheritance taxes based on the beneficiary’s relationship to the decedent. Check your state’s rules—planning may differ for state vs. federal tax.
Proven Strategies to Maximize Estate Tax Deductions
- Leverage the Marital Deduction — Use QTIP or other trusts to qualify for the deduction while controlling asset distribution.
- Charitable Giving — Include bequests to qualified charities or donor-advised funds.
- Lifetime Gifting — Use the $19,000 annual exclusion and $15 million lifetime exemption to reduce the gross estate.
- Irrevocable Trusts — Move assets out of your estate (e.g., ILITs for life insurance).
- Business and Farm Planning — Qualify for special use valuation or Section 6166 deferral.
- Proper Titling and Beneficiary Designations — Ensure assets qualify for deductions.
Review and update your plan annually with current 2026 rules.
Common Mistakes to Avoid
- Failing to file Form 706 when portability is needed (even if no tax due).
- Inadequate documentation for deductions or valuations.
- Missing state filing deadlines or thresholds.
- Overlooking the impact of lifetime gifts on the unified credit.
- Using outdated exemption numbers from prior years.
When to Consult an Estate Planning Professional?
Complex estates, business ownership, blended families, or multi-state assets benefit from expert help. An estate planning attorney or CPA can:
- Prepare Form 706 accurately
- Maximize deductions and credits
- Implement advanced strategies
- Ensure compliance with 2026 OBBB changes
Act before it’s too late—planning is far more effective while you’re living.
Conclusion: Take Action on Your Estate Tax Deductions Today
With the 2026 federal estate tax exemption at $15 million and generous deductions available, most families can avoid or minimize estate taxes through proper planning. Review your will, trusts, and asset titling now. Download the latest IRS Form 706 instructions, consult a qualified professional, and secure your legacy.
For official guidance, visit IRS.gov and search “Estate Tax” or “Form 706.” This guide is for informational purposes only and is not tax or legal advice—always consult your attorney or tax advisor for personalized recommendations based on your situation.