IRC 1034 Rollover Rule: What Replaced It and How It Affects Basis

Internal Revenue Code Section 1034, the home-sale rollover rule, was repealed by the Taxpayer Relief Act of 1997 and no longer applies to any sale after May 6, 1997.¹ While it was in force, it required homeowners who sold at a profit and bought a replacement residence of equal or greater value to defer the gain by reducing the basis of the new home. That old deferral still matters today: if you rolled gain into a home you still own, the deferred amount permanently lowered your tax basis, and the lower basis follows the property until you sell it.²

How the Old Rollover Worked

Section 1034 applied to sales of a principal residence before May 7, 1997. If you sold your home at a profit and bought or built a new principal residence within the replacement period, the gain had to be deferred. The rollover was not optional. Meet the conditions and it happened automatically.³

The replacement period generally ran two years before or after the sale date. To determine the deferral, you compared the new home’s cost to the “adjusted sales price” of the old one. The adjusted sales price was the sale price minus selling expenses, such as agent commissions, and minus qualifying fix-up costs. Fix-up expenses had tight timing rules: the work had to be done within 90 days before the sales contract was signed, and the costs had to be paid within 30 days after closing.

If the new home cost at least as much as the adjusted sales price of the old one, the entire gain was deferred. If it cost less, you owed tax on the shortfall between the two amounts. The deferred portion was then subtracted from the basis of the new home. A homeowner who bought a $200,000 replacement after deferring $60,000 of gain started with a basis of only $140,000 in the new property.

Each rollover was reported on IRS Form 2119, Sale of Your Home, which tracked the deferred gain and the reduced basis of the replacement.⁴ The reductions compounded. A homeowner who traded up three or four times could end up in a current home whose basis was tens or hundreds of thousands of dollars below what they actually paid for it.

The Age-55 Companion Exclusion

Before 1997, a separate version of Section 121 allowed a one-time exclusion of up to $125,000 of gain for sellers age 55 or older who had owned and lived in the home for at least three of the preceding five years.⁵ It was a permanent exclusion rather than a deferral, but it could only be used once in a lifetime, and married couples shared a single election. Many homeowners rolled gain through several houses during their working years and then claimed the $125,000 exclusion on their final sale after turning 55. The 1997 overhaul ended both the rollover and the age-55 exclusion.

What Replaced the Rollover

Current Section 121 lets most sellers permanently exclude up to $250,000 of gain on the sale of a principal residence, or up to $500,000 for married couples filing jointly, without needing to buy another home. These dollar limits are set by statute and are not indexed for inflation, so they remain the same in 2026 as when enacted.²

To claim the full exclusion, you must pass both an ownership test and a use test during the five-year period ending on the sale date. You must have owned the home for at least two years and used it as your main residence for at least two years inside that window. The two years don’t have to be continuous. You can only use the exclusion once every two years.²

For married couples claiming the $500,000 amount, at least one spouse must meet the ownership test, both must meet the use test, and neither can have used the exclusion on another sale within the prior two years.

The Tacking Rule for Former Rollover Homes

If you acquired your current home through a Section 1034 rollover, Section 121(g) gives you a direct benefit: the time you owned and used the earlier home counts toward the two-year ownership and use tests on the current home.⁶ This “tacking” rule runs through the whole chain of rollover properties. If you owned a first home for four years, rolled into a second home, and rolled again into your current home, all those prior periods aggregate when you measure the two-year thresholds today.

How a Past Rollover Still Lowers Your Basis

Every dollar of gain you deferred under Section 1034 reduced the basis of the replacement home by the same amount, and that reduction passed through each successive rollover. If you’ve been in the same home for years or decades after one or more pre-1997 rollovers, your adjusted basis can sit far below what you paid for the current property.

A simple illustration shows how it adds up. Suppose you bought your first home for $80,000 and sold it for $150,000, deferring $70,000 of gain. You then bought your current home for $220,000. Your starting basis in the current home was $150,000, not $220,000, because the deferred $70,000 came off the top. Sell that home now for $600,000 after selling costs, and your realized gain is $450,000. A single filer using the $250,000 exclusion would owe tax on $200,000, where someone looking only at the $220,000 purchase price would expect gain of $380,000 and tax on $130,000.

The cumulative effect grows with each rollover. Homeowners who bought and sold several times before 1997 sometimes carry six-figure basis reductions that make the difference between owing nothing and facing a sizable tax bill.

Rebuilding Basis When the Records Are Gone

The practical problem with old rollovers is paperwork. Form 2119 has not been filed since the 1990s, and many homeowners no longer have copies. Without those records, proving the amount of deferred gain, and proving the capital improvements that would increase basis, becomes a reconstruction project.

The IRS has published guidance on acceptable ways to rebuild basis records when the originals are lost.⁷ The most productive sources include:

Title and escrow companies, which often retain closing documents for decades and can provide copies showing original purchase prices and settlement costs.
Mortgage lenders, who may still have appraisals or other records of the home’s value at purchase.
County assessor records, which establish assessed values and land-to-building ratios and can help approximate a home’s value at the time of purchase.
Old tax returns, available by filing Form 4506-T with the IRS; if Form 2119 was attached, the transcript may show the deferred gain and adjusted basis.
Contractors and home improvement lenders, who may hold invoices for major work or records of the loans that financed it.
Homeowner’s insurance policies, which often list a building’s replacement value and can serve as a starting point.

Courts have sometimes accepted reasonable estimates when records are lost, provided the taxpayer first shows the expense actually occurred. Guessing at a number with no supporting evidence will not work. If bank statements, photographs, or witness testimony establish that an improvement was made, a court may accept a reasonable estimate of its cost. Proving the expense existed is the threshold; some flexibility on the exact dollar figure can follow.

For a long-time homeowner sitting on a large gain and a chain of pre-1997 rollovers, the reconstruction work pays off directly in reduced tax. A tax professional who handles real estate transactions can coordinate the document gathering and flag issues before the home goes on the market.

1
Congress.gov. Taxpayer Relief Act of 1997 (Public Law 105-34)
2
Office of the Law Revision Counsel. 26 U.S. Code 121 – Exclusion of Gain from Sale of Principal Residence
3
GovInfo. 26 CFR 1.1034-1 – Sale or Exchange of Residence
4
Internal Revenue Service. Form 2119 – Sale of Your Home
5
Internal Revenue Service. Publication 523 – Selling Your Home (1997)
6
Office of the Law Revision Counsel. 26 USC 121 – Exclusion of Gain from Sale of Principal Residence
7
Internal Revenue Service. Reconstructing Your Records (FS-2006-7)