Gift Tax Between Spouses: Deductions, Form 709, and Penalties

Under federal law, the gift tax between spouses is generous to the point of vanishing for most couples. If your spouse is a U.S. citizen, you can give them any amount of money or property during your lifetime without owing gift tax, under the unlimited marital deduction in Internal Revenue Code Section 2523.¹ If your spouse is not a U.S. citizen, the deduction disappears, but a special annual exclusion of $194,000 for 2026 covers most transfers.² The rest of this article walks through what qualifies, when the rules bite, and what you actually have to file.

The Unlimited Marital Deduction When Your Spouse Is a U.S. Citizen

There is no ceiling. You could transfer $10 million in stock to your citizen spouse tomorrow and owe nothing.¹ The federal system treats a married couple as a single economic unit and expects to collect tax later, when assets eventually leave the marriage.

Two conditions have to be true. You must be legally married at the time of the gift, and the recipient spouse must be a U.S. citizen. The IRS recognizes any marriage that was valid where it was performed, including same-sex marriages, and a later move to a different state does not change that.³ Registered domestic partnerships and civil unions do not count, even in states that treat them as equivalent to marriage. Gifts to an unmarried partner get only the standard $19,000 annual exclusion for 2026 that applies to any other individual.⁴

The Terminable Interest Problem

The deduction covers outright transfers of ownership. It does not cover a “terminable interest,” meaning a right in property that ends at a set time or on a set event, with the property then passing to someone else. The classic example is a life estate: your spouse gets to live in the house for life, and on their death the house goes to your children. Because your spouse’s interest ends at death and the property never enters their taxable estate, the marital deduction is denied.

The workaround is a Qualified Terminable Interest Property (QTIP) trust. If the trust pays your spouse all of its income for life, and no one else can receive distributions during that time, you can claim the marital deduction by making a QTIP election on Schedule A of Form 709.⁵ The tradeoff: the full value of the trust is later included in your spouse’s estate.

Gifts to a Non-Citizen Spouse

The unlimited deduction is not available when the recipient spouse is not a U.S. citizen, and it makes no difference whether that spouse is a permanent resident or what your own citizenship is.¹ Congress built the restriction on a simple concern: a non-citizen spouse could leave the country and take gifted assets out of reach of the U.S. estate tax.

In place of the deduction, you get a much larger annual exclusion. For 2026, you can transfer up to $194,000 in present-interest gifts to a non-citizen spouse tax-free, compared with the $19,000 exclusion for gifts to anyone else.² The amount adjusts for inflation annually. Only the portion above $194,000 counts as a taxable gift.

“Present interest” is the key qualifier. Your spouse must receive immediate use, possession, or enjoyment of the gift. A future interest, such as a remainder in a trust, does not qualify for the $194,000 exclusion, and the entire value of that gift is potentially taxable.

The Qualified Domestic Trust for Larger Transfers

For transfers above the annual exclusion (or for planning at death), a Qualified Domestic Trust (QDOT) under Section 2056A lets you defer the tax rather than pay it now. Instead of transferring property directly to your non-citizen spouse, you transfer it into a trust that meets specific requirements.⁶

At least one trustee must be a U.S. citizen or a domestic corporation.
That U.S. trustee must have the power to withhold estate tax from any distribution of principal.
Your spouse must be the sole beneficiary during their lifetime.

A QDOT defers tax; it does not eliminate it. The deferred estate tax comes due when principal is distributed to the surviving spouse, when the trust stops meeting QDOT requirements, or when the surviving spouse dies, whichever comes first.⁶ Income distributions to the spouse do not trigger the tax. And if the non-citizen spouse becomes a U.S. citizen before the estate tax return deadline, generally nine months after the first spouse’s death, the QDOT requirement drops away and the unlimited marital deduction applies retroactively.

Gift Splitting for Gifts to Someone Else

Marriage also unlocks gift splitting. When one spouse gives to a third party, both spouses can elect to treat the gift as if each made half.⁷ That effectively doubles the per-recipient annual exclusion, from $19,000 to $38,000 for 2026, without the non-giving spouse actually contributing anything.

Both spouses have to be U.S. citizens or residents, both have to consent, and the election covers every gift either spouse makes during the calendar year. Consent is given by checking the appropriate box on Form 709, so both spouses need to file a return even when only one of them actually made a gift.⁵ One consequence that surprises people: gift splitting creates joint and several liability, so the IRS can pursue either spouse for the full tax on the split gifts.⁷

When You Have to File Form 709

Whether you owe gift tax and whether you have to file are two different questions. You can be well within the marital deduction and still be on the hook for a return.⁸

No Return Needed

You do not have to file Form 709 for an outright gift to your U.S. citizen spouse, whatever the amount.⁵ The unlimited marital deduction absorbs it and no paperwork follows.

Return Required

A gift tax return is required when:

You transferred a terminable interest to your citizen spouse and need to elect QTIP treatment to claim the deduction.⁵
Your present-interest gifts to a non-citizen spouse exceeded $194,000 for the year.²
You gave a non-citizen spouse a gift of a future interest, regardless of amount.
You and your spouse are electing to split gifts to third parties; both spouses file.⁵

Form 709 is due April 15 of the year after the gift.⁵ An income tax extension on Form 4868 automatically extends the gift tax return; if you are not extending your income tax return, Form 8892 gives you a six-month extension for Form 709 alone. Neither extension pushes back the deadline to pay any tax owed.⁹

Penalties for Getting It Wrong

Two mistakes dominate: not filing when required, and undervaluing a non-cash gift.

Failing to file Form 709 when required brings a penalty of 5% of the unpaid tax for each month or partial month the return is late, capped at 25%.¹⁰ If the return is more than 60 days late, the minimum penalty is $525 or 100% of the unpaid tax, whichever is less. When no tax is actually owed, the dollar penalty may be zero, but not filing keeps the statute of limitations from starting, so the IRS can revisit the gift indefinitely.

Undervaluing a gift has its own set of penalties. Report a value that is 65% or less of the correct amount and the IRS imposes a 20% accuracy-related penalty on the underpayment. Report 40% or less of the correct value and the penalty rises to 40%. Neither applies unless the resulting underpayment exceeds $5,000.¹¹ For real estate, closely held businesses, or artwork, a qualified appraisal is the best defense.

Keep the supporting records — appraisals, deeds, transfer documents — until the statute of limitations expires for the year you eventually dispose of the property, not just the year of the gift.¹² Basis questions can surface years later, and if a required return was never filed, no statute of limitations runs at all.

1
Office of the Law Revision Counsel. 26 U.S. Code 2523 – Gift to Spouse
2
Internal Revenue Service. Frequently Asked Questions on Gift Taxes for Nonresidents Not Citizens of the United States
3
Internal Revenue Service. Frequently Asked Questions on Gift Taxes
4
Internal Revenue Service. What’s New – Estate and Gift Tax
5
Internal Revenue Service. Instructions for Form 709
6
Office of the Law Revision Counsel. 26 USC 2056A – Qualified Domestic Trust
7
Office of the Law Revision Counsel. 26 USC 2513 – Gift by Husband or Wife to Third Party
8
Internal Revenue Service. About Form 709, United States Gift (and Generation-Skipping Transfer) Tax Return
9
eCFR. 26 CFR 25.6081-1 – Automatic Extension of Time for Filing Gift Tax Returns
10
Internal Revenue Service. Failure to File Penalty
11
Office of the Law Revision Counsel. 26 U.S. Code 6662 – Imposition of Accuracy-Related Penalty on Underpayments
12
Internal Revenue Service. How Long Should I Keep Records