Quick Answer
An estate tax return (Form 706) must be filed for estates worth more than $13.99 million in 2026. Only about 0.2% of estates (roughly 2,600 annually) are large enough to require filing, but the deadline is just 9 months after death with potential 6-month extension.
Best Answer
Michelle Woodard, Tax Policy Analyst
For families dealing with estates of any size who need to understand the basics
What is an estate tax return (Form 706)?
An estate tax return is a federal tax document that reports the value of someone's estate after they die. Think of it as the IRS's way of ensuring that very wealthy estates pay taxes before assets transfer to heirs. The estate tax applies only to the wealthiest 0.2% of Americans—roughly 2,600 estates per year.
When do you need to file Form 706?
You must file an estate tax return if the gross estate plus adjusted taxable gifts exceed $13.99 million in 2026 (up from $13.61 million in 2025). This threshold is called the "federal estate tax exemption" or "basic exclusion amount."
Example: $15 million estate calculation
Let's say your father passed away in 2026 with:
Since $15.7 million exceeds the $13.99 million threshold, Form 706 is required.
Filing deadlines and penalties
The estate tax return is due 9 months after the date of death. You can request a 6-month extension, but any tax owed is still due by the original 9-month deadline.
Penalty for late filing: 5% per month (up to 25% maximum) of unpaid taxes, plus interest. Even if no tax is owed, there's a penalty for late filing when a return is required.
Key factors that trigger filing requirements
Estate tax rates and calculations
Using our $15.7 million example:
What you should do
If you're handling an estate that might exceed $13.99 million, consult an estate attorney or CPA immediately. Don't wait—the 9-month deadline is firm, and professional valuation of assets takes time.
Even if the estate is below the threshold, consider whether the deceased made large lifetime gifts that might push the combined total over the limit.
Key takeaway: Only estates worth more than $13.99 million in 2026 must file Form 706, but the 9-month deadline is strict and penalties are severe—up to 25% of unpaid taxes plus interest.
Key Takeaway: Only estates exceeding $13.99 million require Form 706, but missing the 9-month deadline costs up to 25% in penalties.
Estate tax exemption amounts and rates for recent years
| Tax Year | Estate Tax Exemption | Top Tax Rate | Estimated Taxable Estates |
|---|---|---|---|
| 2024 | $13.61 million | 40% | ~2,500 |
| 2025 | $13.81 million | 40% | ~2,550 |
| 2026 | $13.99 million | 40% | ~2,600 |
More Perspectives
Diana Flores, Tax Credits & Amendments Specialist
For those dealing with the death of a spouse or parent and navigating estate responsibilities
Surviving spouse considerations
If your spouse died in 2026, you may benefit from the "unlimited marital deduction"—meaning assets passing to you as the surviving spouse generally don't trigger estate tax. However, you still need to file Form 706 if the gross estate exceeds $13.99 million.
Portability election: Don't miss this opportunity
Even if your spouse's estate owes no tax, filing Form 706 within 2 years of death lets you claim their unused estate tax exemption. This "portability election" could save your family hundreds of thousands later.
Example: Your spouse dies with a $5 million estate in 2026. Since it's under the $13.99 million threshold, no estate tax is owed. But by filing Form 706, you can claim their unused $8.99 million exemption ($13.99M - $5M = $8.99M). Now your personal exemption becomes $22.98 million ($13.99M + $8.99M).
Blended families and prior marriages
If the deceased had children from previous marriages, estate planning becomes complex. Assets might pass to children rather than the surviving spouse, potentially triggering estate tax even on smaller estates.
What documents you'll need
Action step: Gather these documents immediately. Professional appraisals can take 60-90 days, and you only have 9 months total.
Key takeaway: Even if no estate tax is owed, filing Form 706 preserves the deceased spouse's unused $8.99 million exemption for future use—potentially saving your heirs hundreds of thousands in taxes.
Key Takeaway: Filing Form 706 for a deceased spouse preserves their unused exemption, potentially doubling your family's estate tax protection.
Michelle Woodard, Tax Policy Analyst
For older adults planning their own estates or managing elderly parents' affairs
Planning to avoid Form 706 requirements
Many retirees approaching the $13.99 million threshold can use strategies to reduce their taxable estate and avoid filing requirements:
Annual gifting strategies
In 2026, you can give $19,000 per recipient annually ($38,000 for married couples) without using your lifetime exemption. A couple with 4 children and 8 grandchildren could transfer $456,000 per year tax-free.
Irrevocable life insurance trusts (ILITs)
Life insurance proceeds count toward your gross estate unless owned by an irrevocable trust. Moving a $2 million policy to an ILIT removes it from your taxable estate.
State estate taxes matter too
Twelve states plus DC impose their own estate taxes with much lower thresholds:
You might need to file state estate tax returns even if your estate doesn't require federal Form 706.
Generation-skipping transfer tax (GSTT)
If you're leaving assets directly to grandchildren or great-grandchildren, an additional 40% generation-skipping tax may apply on amounts over $13.99 million (same threshold as estate tax).
Example: $20 million estate to grandchildren
What to do now
If your estate approaches $13.99 million:
1. Get a professional estate valuation
2. Consider annual gifting programs
3. Review beneficiary designations on retirement accounts and life insurance
4. Consult an estate attorney about trusts and other planning strategies
Don't wait until death to plan—many strategies require years to implement effectively.
Key takeaway: Estates approaching $13.99 million should implement gifting and trust strategies now, as post-death planning options are extremely limited.
Key Takeaway: Proactive estate planning through gifting and trusts can keep your estate under the $13.99 million filing threshold.
Sources
- IRS Form 706 Instructions — United States Estate Tax Return instructions and requirements
- IRS Publication 559 — Survivors, Executors, and Administrators
Related Questions
Reviewed by Michelle Woodard, Tax Policy Analyst on February 28, 2026
This content is for educational purposes only and is not a substitute for professional tax advice. Consult a qualified tax professional for advice specific to your situation.