For tax purposes, an estate is created the moment the person dies. The date an estate is created for tax purposes is the date of death printed on the death certificate, not the date someone opens probate, files a will, or is appointed executor. That single date then controls asset valuations, which year’s estate tax exemption applies, when returns are due, and the basis heirs take in what they inherit.
Why the Date of Death Is the Creation Date
At death, the deceased person can no longer own property or owe debts in their own name. The estate steps into that role automatically, by operation of law. No court filing triggers it. No executor appointment triggers it. An estate with no probate case opened and no personal representative named still exists from the instant of death.
Probate is often confused with creation, but they’re separate things. Probate is the court-supervised process for administering an estate that already exists. The paperwork that eventually gets filed, sometimes weeks or months later, manages the estate; it doesn’t bring it into being. For every tax question that follows, the clock runs from the date of death.
What the Date Locks In for Taxes
Stepped-Up Basis for Inherited Property
The most financially significant consequence of the creation date is the stepped-up basis. When someone inherits property, its tax basis resets to the fair market value on the date of the decedent’s death rather than whatever the deceased originally paid for it.1Office of the Law Revision Counsel. 26 U.S. Code 1014 – Basis of Property Acquired From a Decedent A house a parent bought in 1985 for $80,000 and worth $450,000 at death gives the heir a basis of $450,000. Sell for $460,000, and the capital gain is $10,000, not $370,000.
The IRS confirms the basis of inherited property is generally the fair market value on the date of the decedent’s death, regardless of whether the executor files an estate tax return.2Internal Revenue Service. Gifts and Inheritances A stale or missing date-of-death appraisal can cost heirs thousands in overpaid capital gains tax years later when they sell.
Which Year’s Estate Tax Exemption Applies
The creation date determines which year’s federal estate tax rules govern the estate. For deaths in 2026, the basic exclusion amount is $15,000,000 per individual.3Internal Revenue Service. What’s New — Estate and Gift Tax Only value above that threshold faces federal estate tax, which tops out at 40%.4Office of the Law Revision Counsel. 26 USC 2001 – Imposition and Rate of Tax An estate falls under the exemption in force on the date of death, not the exemption in force when the return is filed.
Most estates fall well below the threshold and owe no federal estate tax at all. Some states impose their own estate or inheritance taxes with much lower exemptions, so the date-of-death valuation can still carry weight at the state level even when nothing is due federally.
The Nine-Month Filing Clock
The federal estate tax return, Form 706, is due nine months after the date of death.5Internal Revenue Service. Instructions for Form 706 That deadline runs from the creation date, not from probate opening, executor appointment, or asset discovery.
The Six-Month Alternate Valuation Option
The date of death is the default valuation moment, but there is one exception. If asset values drop after death, the executor can elect to value the entire estate six months later. Under this alternate valuation, any property sold or distributed within that six-month window is valued on the date it actually changed hands, while anything still held by the estate is valued at the six-month mark.6Office of the Law Revision Counsel. 26 USC 2032 – Alternate Valuation
The election is all-or-nothing across the estate. The executor can’t cherry-pick which assets get the later date. It’s also only available when it actually reduces both the estate tax and the total gross estate value.
When the Estate Starts Filing Its Own Taxes
Because the estate exists from the moment of death, income the deceased’s assets generate after that date belongs to the estate, not to the deceased. Interest, dividends, rent, business income from after death are the estate’s income. The deceased’s Social Security number stops being the right identifier for that activity.
The estate needs its own Employer Identification Number from the IRS, obtained on Form SS-4. The online application issues the number immediately at no cost.7Internal Revenue Service. Get an Employer Identification Number The executor needs that EIN before opening estate bank accounts or filing any returns for the estate.8Internal Revenue Service. Information for Executors
If the estate has gross income of $600 or more in a tax year, the executor must file Form 1041, the fiduciary income tax return.9Internal Revenue Service. Instructions for Form 1041 and Schedules A, B, G, J, and K-1 Here the creation date gives the executor some flexibility: unlike trusts, which must use the calendar year, an estate can pick any fiscal year that ends within twelve months of the date of death. A thoughtful fiscal year choice can reduce the number of 1041s the estate ever has to file. An estate created in March, for example, might choose a fiscal year ending in January, aligning the final return more closely with when assets are actually distributed.
Assets That Never Enter the Estate
Not everything the person owned on the date of death flows into the probate estate, and this often surprises families. Some assets transfer directly to a named person outside probate entirely:
- Property held in joint tenancy with right of survivorship passes automatically to the surviving co-owner.
- Retirement accounts, life insurance, and annuities pass to whoever is named as beneficiary, regardless of what the will says.
- Payable-on-death and transfer-on-death bank and brokerage accounts transfer directly to the named person.
These assets still count for estate tax purposes as part of the gross estate, but they bypass probate. An outdated beneficiary designation can override a newer will, which is why retirement accounts sometimes end up with ex-spouses no one meant to leave anything to.
Trusts Follow Different Creation Rules
A trust and a deceased person’s estate are not the same thing, and the creation date works differently. A living trust is created when the grantor signs the trust document and transfers assets into it. Both steps matter. A signed trust document with nothing funded into it accomplishes little, and the assets end up passing under the will or state intestacy law instead.
A testamentary trust runs on a different timeline altogether. Its terms sit inside the will, but the trust itself doesn’t exist until the grantor dies and the will moves through probate. Its creation date is effectively the date probate finalizes it, not the date the will was drafted.