Carryover basis is the tax rule that transfers the original owner’s cost basis to the person who receives the property, instead of resetting it to current market value. If your aunt bought shares for $10,000 that are now worth $100,000 and gives them to you, your basis is $10,000, not $100,000. Sell them the next day and you owe capital gains tax on the full $90,000 of appreciation. The gain doesn’t disappear because ownership changed hands; it follows the asset until someone finally sells.
The rule shows up most often with lifetime gifts, transfers between spouses, divorce settlements, and certain trust distributions. It is the reason well-intentioned family gifting can produce a bigger tax bill than doing nothing at all.
How Carryover Basis Differs From a Stepped-Up Basis at Death
Property you inherit is treated differently from property you receive as a gift. Assets acquired from a decedent generally get a “stepped-up” basis equal to fair market value on the date of death.1Office of the Law Revision Counsel. 26 USC 1014 – Basis of Property Acquired From a Decedent All the appreciation that built up during the decedent’s lifetime is wiped out for income tax purposes. Stock bought at $10,000 that grew to $500,000 in a parent’s hands passes to the heir at a $500,000 basis; a sale at that price produces zero capital gains tax.
Gifted property works the opposite way. The recipient takes the donor’s original cost basis, and none of the built-in gain vanishes.2Office of the Law Revision Counsel. 26 USC 1015 – Basis of Property Acquired by Gifts and Transfers in Trust Using the same numbers, gifting that $500,000 stock during life keeps the $10,000 basis in place, and the recipient’s eventual sale triggers tax on $490,000 of gain. With the federal estate tax exemption at $15,000,000 for 2026,3Internal Revenue Service. Whats New – Estate and Gift Tax most estates pass with no federal estate tax due, so gifting appreciated property during life often trades a tax that would never have been owed for a very real income tax bill later.
Figuring Your Basis After a Gift
Your basis for calculating gain is the donor’s adjusted basis at the time of the gift.2Office of the Law Revision Counsel. 26 USC 1015 – Basis of Property Acquired by Gifts and Transfers in Trust Adjusted basis is the donor’s original cost, increased by capital improvements and decreased by depreciation or other basis reductions. If your uncle bought rental property for $200,000, put on a $40,000 roof, and claimed $30,000 in depreciation, his adjusted basis was $210,000. Gift the property to you, and $210,000 is where your basis starts.
You step into the donor’s shoes: same cost history, same improvements, same depreciation schedule. Any appreciation that occurred before the gift, plus any appreciation while you own it, eventually faces tax when you sell.
The Dual-Basis Rule for Property That Has Lost Value
Things get more complicated when the donor’s adjusted basis is higher than the property’s fair market value on the date of the gift. You then carry two different basis figures. For calculating a gain, you use the donor’s adjusted basis. For calculating a loss, you use the lower fair market value on the gift date.4Internal Revenue Service. Publication 551 – Basis of Assets
Between those two figures sits a zone with no gain and no loss. Say your mother’s basis in a piece of jewelry was $8,000 but its value on the date of gift was $5,000. If you sell for $6,000, the donor-basis calculation shows a $2,000 loss, and the fair-market-value calculation shows a $1,000 gain. When the two rules point in opposite directions, the result is zero, with no gain and no loss to report.4Internal Revenue Service. Publication 551 – Basis of Assets The takeaway: gifting property that has lost value is usually a poor tax move. It is generally better for the donor to sell, claim the loss on their own return, and gift the cash.
When Gift Tax Paid Adds to Your Basis
If the donor actually paid federal gift tax on the transfer, you can increase your basis by the portion of that tax attributable to the property’s net appreciation, meaning the amount by which fair market value exceeded the donor’s adjusted basis at the time of the gift.2Office of the Law Revision Counsel. 26 USC 1015 – Basis of Property Acquired by Gifts and Transfers in Trust The formula multiplies the total gift tax paid by a fraction, with net appreciation on top and the total gift value (after the annual exclusion and any applicable deductions) on the bottom.4Internal Revenue Service. Publication 551 – Basis of Assets Even with the adjustment, your basis cannot exceed the property’s fair market value on the gift date.
The adjustment only applies to gift tax the donor actually paid in cash. When the donor uses the lifetime unified credit to offset the liability, no gift tax is “paid” and no basis increase is available.5eCFR. 26 CFR 1.1015-5 – Increased Basis for Gift Tax Paid With a $15,000,000 lifetime exemption for 2026, most donors will shelter their gifts entirely with the credit rather than writing a check. The annual gift tax exclusion for 2026 is $19,000 per recipient, and gifts within that limit don’t require gift tax at all.3Internal Revenue Service. Whats New – Estate and Gift Tax
To find the tax actually paid, you need the donor’s Form 709. That form calculates tax on the aggregate value of all gifts in a calendar year, not asset by asset,6Internal Revenue Service. Instructions for Form 709 so if the donor made multiple gifts in the same year, the total tax has to be allocated to your gift using the appreciation formula above.
Spousal Transfers and Divorce
Transfers between spouses, whether during the marriage or as part of a divorce, produce no gain or loss.7Office of the Law Revision Counsel. 26 USC 1041 – Transfers of Property Between Spouses or Incident to Divorce The receiving spouse takes the transferor’s adjusted basis regardless of what the property is worth or what changed hands to get it. A buyout in a divorce settlement is still treated as a tax-free transfer with carryover basis.
That deferral can be a trap in a settlement negotiation. Two assets with equal current values can hide very different embedded tax liabilities. The house valued at $600,000 with a $150,000 basis carries $450,000 of built-in gain; the brokerage account valued at $600,000 with a $580,000 basis carries only $20,000. Splitting them as if they were equivalent leaves one spouse with a much larger future tax bill than the other.
Timing for Divorce Transfers
A transfer qualifies for tax-free treatment if it happens while the couple is still married or is “incident to the divorce.” Incident to the divorce means either within one year after the marriage ends, or under a divorce or separation instrument and within six years after the marriage ends.8GovInfo. Treasury Regulation 1.1041-1T – Transfers of Property Between Spouses or Incident to Divorce Transfers after the six-year window are presumed unrelated to the divorce, though the presumption can be rebutted if legal disputes or business impediments caused the delay.
The Trust-With-Excess-Liabilities Exception
One statutory exception cuts through the no-gain rule. If a spouse transfers property into a trust and the liabilities on the property exceed its adjusted basis, the transferor recognizes gain on the excess.7Office of the Law Revision Counsel. 26 USC 1041 – Transfers of Property Between Spouses or Incident to Divorce This shows up most often with heavily mortgaged real estate transferred into a trust during a divorce. The gain recognized bumps up the transferee’s basis by the same amount.
Holding Period Tacking
Long-term capital gains are taxed at lower rates than short-term gains, and for carryover-basis property you get credit for the donor’s holding period on top of your own.9Office of the Law Revision Counsel. 26 USC 1223 – Holding Period of Property If your father held stock for eleven months and you sell it two months after receiving it, the combined thirteen-month holding period qualifies for long-term treatment.
Tacking applies whenever your basis is determined by reference to the prior owner’s basis, so it covers gifts, spousal transfers, and trust distributions where the beneficiary takes a carryover basis. One caveat: when the dual-basis rule pushes you onto the lower fair-market-value figure for a loss, tacking may not apply to that loss transaction, because your basis is no longer derived from the donor’s basis.
Carryover Basis in Trust Distributions
When a trust distributes property instead of cash, the beneficiary’s basis depends on whether the trustee makes a specific election. Without an election, the beneficiary takes the trust’s adjusted basis in the property.10Office of the Law Revision Counsel. 26 USC 643 – Definitions Applicable to Subparts A, B, C, and D The trust recognizes no gain or loss, and the distribution amount for income tax purposes is the lesser of the trust’s basis or the property’s fair market value.
If the trustee elects to recognize gain, the trust is treated as if it sold the property to the beneficiary at fair market value. The trust pays the tax on the gain, and the beneficiary’s basis steps up to fair market value. The election applies to all in-kind distributions for the entire tax year; the trustee cannot pick and choose which assets it covers.10Office of the Law Revision Counsel. 26 USC 643 – Definitions Applicable to Subparts A, B, C, and D It can make sense when the trust sits in a lower tax bracket than the beneficiary and the property has significant appreciation. The math has to be run.
A separate rule applies to trusts subject to generation-skipping transfer tax: basis can be increased by the portion of GST tax attributable to net appreciation, and a taxable termination triggered by a beneficiary’s death produces a basis adjustment similar to the stepped-up basis rules, scaled by the trust’s GST inclusion ratio.11Office of the Law Revision Counsel. 26 USC 2654 – Special Rules
Records You’ll Need
Getting the basis right depends on documentation, and the burden lands on whoever eventually sells. You need the donor’s original purchase price, any capital improvements made during the donor’s ownership, and any depreciation claimed if the property was used for business or rental purposes.4Internal Revenue Service. Publication 551 – Basis of Assets Closing statements, purchase receipts, renovation invoices, and the donor’s prior tax returns are the useful records. Ask for them at the time of the gift. Tracking down a parent’s 1987 closing statement after they’ve died is much harder than getting a copy while they are alive and organized.
You also need fair market value on the date of the gift, especially if the property may have declined in value and the dual-basis rule could apply. Real estate calls for a professional appraisal. Publicly traded stock uses the closing price on the gift date. Art, collectibles, and closely held business interests generally require a qualified appraiser.
If the Records Are Gone
If you can’t find the original purchase records, you still have options. Under the Cohan rule, a longstanding judicial doctrine, taxpayers can establish an approximate basis using credible secondary evidence such as bank records showing the purchase, property tax assessments from the year of acquisition, comparable sales data, or testimony from people involved in the original transaction.12Internal Revenue Service. The Cohan Rule – An IRS Audit Defense Tool Courts have accepted reconstructed basis for items ranging from coin collections to retirement account contributions. The rule is a defense, not a guarantee. A bare guess with no supporting evidence can be rejected outright.
Reporting the Sale, Rates, and Penalties
Report the sale on Form 8949 and carry the totals to Schedule D.13Internal Revenue Service. Instructions for Form 8949 Enter the date the donor originally acquired the property as the acquisition date, and use the donor’s adjusted basis (plus any gift tax adjustment) as the cost basis. Subtract that from your sale proceeds to calculate the gain.
Long-term capital gains, from assets held more than one year including tacked holding periods, are taxed at 0%, 15%, or 20% depending on total taxable income.14Internal Revenue Service. Tax Topic 409 – Capital Gains and Losses For 2026, a single filer pays 0% on long-term gains when taxable income stays below roughly $49,450, and the 20% rate begins at roughly $545,500. Married couples filing jointly reach the 15% bracket around $98,900 and the 20% bracket above $613,700. Short-term gains, from assets held one year or less, are taxed as ordinary income, which is exactly why the holding-period tacking rule matters.
Higher earners face an additional 3.8% Net Investment Income Tax on the lesser of net investment income or the amount by which modified adjusted gross income exceeds $200,000 for single filers or $250,000 for joint filers.15Internal Revenue Service. Net Investment Income Tax Capital gains from selling carryover-basis property count as net investment income, so one large sale can push you over the threshold even if your regular income wouldn’t.
Getting the basis wrong has consequences. The IRS imposes a 20% accuracy-related penalty on any underpayment attributable to negligence or a substantial understatement of income.16Office of the Law Revision Counsel. 26 USC 6662 – Imposition of Accuracy-Related Penalty on Underpayments Overstating basis to shrink a gain is the kind of error that triggers it, and missing records is not a defense. It’s the reason to start collecting documentation the day the property changes hands.