Selling Property Owned 30 Years or More With No Basis Records

The law puts the burden of proving basis on you

Reg. section 1.6001-1(a) requires every taxpayer to keep records sufficient to establish the amount of income, deductions and other matters shown on a return. Publication 551 applies that to property: you must keep accurate records of all items that affect the basis of property so you can compute depreciation and gain.

Publication 583 says to keep property records until the period of limitations expires for the year in which you dispose of the property in a taxable disposition. If you received the property in a nontaxable exchange, you must also keep the records of the old property until you sell the new one, because the new basis is built from the old.

A basis you cannot support is exposed to adjustment, and every dollar of basis disallowed is a dollar of gain. That is why reconstruction is worth doing before the sale closes and the return is filed.

Rebuild the purchase price, the land split and the improvements from outside sources

The purchase price and settlement costs come from the deed recorded with the county, the title or escrow company's closing file and the original lender's loan file. Publication 551 says basis includes the settlement fees and closing costs of buying, but not the costs of getting a loan.

Prior returns are the best evidence of the depreciation schedule. The Form 4506 instructions say copies of Forms 1040 are generally available for 7 years from filing before they are destroyed, at $30 per return; older schedules have to come from the preparer's files or your own. For the land and building split, Publication 527 allows the ratio of assessed values for real estate tax when fair market values are unknown, and county assessors often hold historic values.

Improvements are the hardest. Building permits, contractor invoices, bank and card statements, insurance claims and photographs can each support a capital cost. Repairs and maintenance never added to basis, so only capital improvements belong on the list.

After 30 years, depreciation has already used up most of the building

Section 1016(a)(2) reduces basis by depreciation allowed, but not less than the amount allowable. Residential rental property is depreciated straight line over 27.5 years, so a building placed in service in 1998 or earlier has, by 2026, a building basis at or near zero whether or not depreciation was claimed. If depreciation was missed, the Form 3115 catch-up page shows how to claim it before the sale.

That changes what the lost records cost you. The building's original price no longer affects gain; the land cost, which is never depreciated, and capital improvements still within their recovery periods do. Missing receipts for a 1995 kitchen matter little; missing receipts for a 2018 roof matter more.

Commercial property bought from 1981 through 1986 is different. Publication 534 says gain on nonresidential 15, 18 or 19-year real property depreciated under accelerated ACRS is ordinary income to the extent of all prior depreciation, unless the straight-line alternate method was elected. Proving the method used is worth the effort.

A worked example: a rental house bought in 1994

Hypothetical, round numbers. You bought a rental house in 1994 for $120,000. The closing statement is gone, but the deed and the county's 1994 assessment show a 25 percent land ratio, so land is $30,000 and the building $90,000, fully depreciated by 2021. You can document a $15,000 roof replaced in 2012, which has about $7,600 of depreciation through 2026.

Adjusted basis is the $30,000 land plus the $7,400 undepreciated roof, or $37,400. You sell in 2026 for $650,000 with $40,000 of selling costs, so the gain is $572,600. Depreciation of $97,600 is taxed at up to 25 percent, about $24,400, and the remaining $475,000 is long-term capital gain at 15 or 20 percent under the 2026 brackets in Rev. Proc. 2025-32.

Without the assessor ratio or the roof invoice, an examiner could start from a lower basis. Run your own numbers with your CPA, and keep the reconstruction file with the return.

An exchange defers the problem, and a step-up at death ends it

A 1031 exchange defers the gain, but under section 1031(d) the replacement takes your old basis, so the reconstruction still has to be done for Form 8824 and kept until the replacement is sold. The Form 8824 instructions page shows where the old basis enters.

If you plan to hold for life, the reconstructed basis may never be used. Property passing at death takes its fair market value under section 1014, so heirs need a date-of-death appraisal rather than your 1994 paperwork; the step-up in basis page explains. Owners who want out of management but not into a large tax bill often exchange into passive replacement property, such as traditional DST interests, and hold it.