Basic Exclusion Amount

The lifetime gift and estate tax exemption is the amount an individual can transfer free of federal gift and estate tax, counted across their whole life and their estate together. For 2026 it is $15,000,000 per person.

The statute reaches that result through three nested terms, and knowing which is which resolves most of the confusion in this area. Internal Revenue Code section 2010(a) allows every estate a credit called the applicable credit amount. Section 2010(c)(1) defines that credit as the tentative tax that would be due on an applicable exclusion amount. Section 2010(c)(2) then defines the applicable exclusion amount as the basic exclusion amount, plus, for a surviving spouse only, any deceased spousal unused exclusion amount. So the basic exclusion amount is the headline figure everyone quotes, the applicable exclusion amount is what an individual taxpayer actually has available, and the difference between them is portability. Section 2010 never calls the current amount an exemption; the only "exemption" in the section is the specific exemption under the long-repealed section 2521. The colloquialism is not simply an error, though, because Congress does call this same dollar figure an exemption for the third transfer tax: section 2631 is headed "GST exemption."

Why it is one allowance and not two. Section 2001(b) computes the estate tax on a base equal to the taxable estate plus adjusted taxable gifts, meaning post-1976 taxable gifts that are not already in the gross estate. It then subtracts the gift tax that would have been payable on those gifts and applies the credit. The effect of adding lifetime gifts back into the base is that they have already consumed part of the single exclusion by the time the estate is computed. Anyone describing this as a separate lifetime gift allowance and a separate estate allowance is double-counting.

This sits underneath, and is separate from, the annual gift tax exclusion. Gifts within the annual per-recipient exclusion never become taxable gifts at all and never touch the lifetime figure; the lifetime amount is only consumed by gifts above it.

Portability, briefly. The deceased spousal unused exclusion amount is defined at section 2010(c)(4) as the lesser of the basic exclusion amount and the unused exclusion of the last such deceased spouse. Two limits are built into that sentence and both matter. It is capped at one basic exclusion amount, so a survivor cannot stack unused amounts from several marriages, and it looks only to the most recent deceased spouse, so remarrying and being widowed again can replace a large inherited amount with a smaller one. Section 2010(c)(5)(A) then requires a filed estate tax return making an irrevocable election, and says no election may be made on a return filed after the time prescribed including extensions. Without that election the first spouse's exclusion is simply gone, which is the single most common and most expensive mistake in this area.

The sunset that did not happen. The 2017 tax law's doubled exclusion was scheduled to fall by roughly half after 2025. The 2025 tax law did not extend that schedule; it replaced the provision, setting the basic exclusion amount at a flat figure with inflation indexing for decedents dying after 2026. There is no sunset in the current text. Any planning material written before July 2025 that urges gifting now to lock in an exclusion about to be halved is describing repealed law.

What happens if a future Congress lowers it. This is the standing question about large lifetime gifts, and there is a regulation on point. Treasury Regulation 20.2010-1(c) provides that where the credits allowable on a decedent's post-1976 gifts, to the extent based solely on the basic exclusion amount, exceed the credit that would be allowable at death on that basis, the estate tax credit is computed using the larger amount that was actually used for the gifts. In plain terms, a large gift made under a high exclusion is not clawed back if the exclusion later falls. But read the regulation's own second example before relying on it: the rule only helps to the extent the higher exclusion was actually used, so gifts well below the later, lower figure gain nothing from it. The benefit belongs to people who use the exclusion, not to people who merely had access to it.

Every taxable gift is reported on a gift tax return, and the running total of those gifts is tracked across the giver's lifetime. No tax is due while the cumulative total stays within the exclusion. At death, the estate computes a tentative tax on the taxable estate plus those lifetime taxable gifts, then applies the credit, so the exclusion is spent once across both.

A hypothetical, using a round stand-in exclusion of $10,000,000 so the arithmetic survives the annual indexing of the real figure. Priya makes $4,000,000 of taxable gifts during her life, none of which produce tax because they are within the exclusion. She dies with a taxable estate of $9,000,000. The estate tax base is 9,000,000 plus the 4,000,000 of adjusted taxable gifts, or $13,000,000. Against that sits one exclusion of $10,000,000, so $3,000,000 is exposed to the tax.

Note what the arithmetic does not do. It does not give Priya $10,000,000 of gifting room and another $10,000,000 at death. And it does not tax the $4,000,000 twice: the credit for gift tax that would have been payable prevents that.

If Priya had been widowed and her spouse's estate had filed a timely return electing portability, her applicable exclusion amount would be her own basic exclusion amount plus the unused portion of her spouse's, and the exposed amount would fall accordingly. Without that election, it would not.

Pros

• Large enough that federal estate tax reaches a very small share of estates.
• Unified across gifts and the estate, so a lifetime gifting plan does not have to be traded off against the amount available at death.
• Indexed for inflation for decedents dying after 2026, so it does not erode silently.
• Portable between spouses, effectively doubling it for a married couple.
• A large gift made under a high exclusion is protected by regulation if the exclusion later falls.

Cons

• Portability is not automatic. It requires a timely filed estate tax return from an estate that usually has no other reason to file one.
• The deceased spousal unused exclusion is capped at one basic exclusion amount and looks only to the most recent deceased spouse.
• Lifetime gifts consume it, so gifting and bequeathing draw on the same pot.
• It says nothing about state estate or inheritance taxes, several of which apply at far lower thresholds.
• The anti-clawback protection only rewards exclusion actually used, so holding the amount in reserve preserves nothing.
• The generation-skipping transfer tax has its own separate exemption, which is easy to overlook.