What Is a 1039 Tax Exchange? Section 1033 Involuntary Conversions

There is no current Section 1039 of the Internal Revenue Code, so a “1039 tax exchange” is almost always a reference to Section 1033. The original Section 1039 applied to sales of low-income housing projects and was repealed in 1990.¹ Section 1033 is the operative rule for involuntary conversions: when property is destroyed, stolen, condemned, or sold under threat of condemnation, you can defer the gain by reinvesting in qualifying replacement property within a set deadline.² It matters most to farmers and ranchers forced to sell livestock or lose crops to drought, flood, or other weather disasters. The deferral postpones the tax, it does not erase it, and the cost shows up later as a reduced basis in the replacement property.

Why “1039” Is the Wrong Section Number

Congress added Section 1039 to the Code in 1969 for owners of qualified low-income housing projects who sold one project and bought another.³ It never covered agriculture, livestock, or disaster losses, and it is no longer on the books.¹ The number is close enough to Section 1033 that the two get mixed up constantly. Everything below describes Section 1033.

What Qualifies as an Involuntary Conversion

An involuntary conversion happens when you lose property through destruction, theft, seizure, condemnation, or the threat of condemnation. The converted property can be replaced directly with similar property, or it can be converted into money (an insurance check, a condemnation award, forced sale proceeds) that you then reinvest.² Section 1033 only applies to gains. Losses are handled under separate rules.

Most agricultural conversions come through money rather than direct replacement, because the farmer receives sale proceeds or an insurance payment. In that situation, deferral is available only if you elect it and buy qualifying replacement property within the statutory period.

Weather-Related Livestock Sales

Section 1033(e) carves out a special rule for livestock other than poultry. If you hold livestock for draft, breeding, or dairy purposes and you sell more animals than usual solely because of drought, flood, or other weather-related conditions, the excess sales count as involuntary conversions.⁴ Livestock held primarily for sale, such as cattle in a feedlot, is inventory and does not qualify.

The word that does the work is “excess.” Only the sales above your normal pattern qualify. If you typically sell 100 head a year but sell 150 because drought wiped out your pasture, the gain on 50 head is eligible for deferral. The gain on the first 100 remains ordinary business income. Your normal sales volume is generally measured against your pattern in prior years, so keep records that show what a typical year looks like for your operation.

The sale has to be driven by the weather event itself, whether through lost feed, water, or usable pasture. A voluntary thinning of the herd during a soft market does not qualify. The area where the livestock is held must also be designated as eligible for federal disaster assistance.⁵ Keep documentation of the federal or state designation in your files.

Crop Insurance and Damaged Harvests

Farmers who receive insurance proceeds for a destroyed or damaged crop can also use Section 1033 to defer the gain, as long as the crop cannot be replanted in the same tax year. The insurance payment is the amount realized. The sale of an unharvested crop together with the underlying land can also be treated as an involuntary conversion when the sale is forced by the weather event.⁶

Calculating the Deferred Gain

Start with what you received (sale proceeds or insurance money), subtract the adjusted basis of the lost property, and the difference is your realized gain. You recognize gain only to the extent the amount realized exceeds what you spend on qualified replacement property.⁴

Say a rancher sells qualifying breeding livestock for $100,000 with an adjusted basis of $30,000. The realized gain is $70,000. Reinvest the full $100,000 in qualifying replacement property and no gain is recognized; the entire $70,000 is deferred. Spend only $80,000 and the $20,000 shortfall is recognized as taxable gain, with the remaining $50,000 deferred.

The Basis Trade-Off

Deferral is not forgiveness. The tax you avoid now gets built into the replacement property through a reduced basis. The statute sets the basis of the replacement property at its purchase cost minus the gain you did not recognize.⁴

In the example where the rancher spent $80,000 and deferred $50,000, the replacement basis is $30,000. If the rancher reinvested the full $100,000 and deferred all $70,000, the replacement basis is still $30,000. That is the same number as the original livestock’s basis, which is the point: the old basis carries forward whenever you reinvest at least the full amount realized.

A lower basis means smaller depreciation deductions and a larger taxable gain when you eventually sell the replacement property. This is the real cost of deferral, and it tends to surprise people years later. Keep detailed records of the original basis, the conversion proceeds, and the replacement cost so you can calculate the future gain correctly.

What Counts as Replacement Property

The general rule is that replacement property must be “similar or related in service or use” to what you lost.⁴ For most conversions this is a narrow test. Breeding cattle must be replaced with breeding cattle.

Weather-related livestock conversions get a much broader exception. Under Section 1033(f), if it is not feasible for you to reinvest in property similar to the converted livestock (including conversions caused by soil contamination), you can buy any property used for farming purposes and still qualify.⁴ Farm equipment, irrigation systems, additional acreage, or a barn can all qualify, provided the asset is actually used in your farming business. A rancher who sold breeding cattle during a drought could buy new farmland to replace lost grazing capacity and still defer the gain.

You do not have to spend the actual conversion proceeds. If you use the insurance check for something else and borrow to buy replacement property, the deferral still works, as long as the purchase happens within the replacement period.⁶ Property received as a gift or inheritance does not count.

Replacement Period Deadlines

The standard replacement period starts on the date you dispose of the converted property (or the date of the condemnation threat, if earlier) and runs through the end of the second tax year after the first year in which you realize any part of the gain.⁴ A calendar-year farmer who sells in October 2026 and realizes gain that year has until December 31, 2028.

Weather-related livestock sales under Section 1033(e) get a four-year replacement period measured from the close of the first tax year of gain.⁴ Same farmer, same October 2026 sale: deadline December 31, 2030. The longer window reflects how long it takes to rebuild a breeding herd or find suitable grazing after a serious drought.

If the weather conditions that triggered the federal disaster designation last more than three years, the Treasury Secretary can extend the replacement period further on a regional basis.⁵ The IRS publishes annual notices listing the counties and regions covered. Check each year you are still shopping for replacement property.

How to Elect and Report the Deferral

When the conversion produces money, deferral is not automatic. You have to elect it on the return for the year you realize the gain, even if you have not yet bought the replacement property. The election is made by reporting the conversion and attaching a statement that explains the transaction and your intent to reinvest.

The statement should cover the conversion event (date, type of disaster, what forced the sale or loss), the converted property (description, number of head sold, acreage destroyed), the gain calculation (amount realized, adjusted basis, realized gain), and the replacement property (description and cost of anything already purchased, or a statement of intent to buy within the replacement period).

The form depends on the type of conversion. Casualty and theft gains and losses go on Form 4684. Other involuntary conversions of business property, including weather-related livestock sales, go on Form 4797.⁷ Depreciation recapture, if any, is also reported on Form 4797.⁶

When you actually buy the replacement property in a later year, report the details on that year’s return as well: the cost, the final gain calculation, and the adjusted basis of the new property. If the replacement period spans multiple years, update the IRS each year.

If You Miss the Deadline

Failing to buy qualifying replacement property within the replacement period unwinds the deferral. You will need to file an amended return (Form 1040-X) for the year you originally realized the gain and report the full amount. Interest accrues from the original due date of that return, and penalties may apply to the underpayment.

If the replacement property costs less than the amount realized, the shortfall is recognized as gain in the year the replacement period expires. Either way, track the timeline. Amending an older return and paying interest on top of the tax is an expensive outcome that planning can avoid.

Section 451(g): A Shorter One-Year Deferral

Section 1033 is not the only option. Section 451(g) lets qualifying farmers push income from excess weather-related livestock sales into the following tax year instead of deferring until replacement.⁸ The requirements are narrower:

You must use the cash receipts and disbursements method.
Your principal trade or business must be farming.
Only sales above your normal pattern qualify, as with Section 1033(e).
The area must be designated as eligible for federal assistance because of drought, flood, or other weather-related conditions.
You must show that you would normally have made the sale in the following year under your usual business practices.

The election goes with the return for the year of sale. Section 451(g) and Section 1033 are not mutually exclusive; when the Section 1033(e) four-year replacement period applies, a 451(g) election made during that replacement period is treated as valid.⁸ Section 451(g) tends to fit when you expect to replace the livestock quickly and simply want to shift the income into the year the replacement costs will land. Section 1033 is the better tool when rebuilding will take longer and you need the full two- or four-year window.

1
Office of the Law Revision Counsel. 26 USC 1039 – Repealed
2
eCFR. 26 CFR 1.1033(a)-1 – Involuntary Conversions; Nonrecognition of Gain
3
eCFR. 26 CFR 1.1039-1 – Certain Sales of Low-Income Housing Projects
4
Office of the Law Revision Counsel. 26 USC 1033 – Involuntary Conversions
5
Internal Revenue Service. Notice 2022-43 – Extension of Replacement Period for Livestock Sold on Account of Drought
6
Internal Revenue Service. IRS Publication 225 – Farmers Tax Guide
7
Internal Revenue Service. About Form 4797, Sales of Business Property
8
Office of the Law Revision Counsel. 26 USC 451 – General Rule for Taxable Year of Inclusion