I bought S corporation stock that includes a building. Can I cost segregate the purchase price?
Usually not the stock price itself. In a plain stock purchase, the buyer acquires basis in shares, while the corporation generally keeps its existing adjusted tax basis and depreciation history in the building. A cost-segregation study may still analyze eligible property basis the corporation already has, but it cannot turn the premium paid for stock into fresh building basis. An eligible, properly made deemed-asset-sale election or a true asset purchase can change that starting point.
This matters before a letter of intent or closing because the deal structure determines what property-level basis the study can classify. AE can reconcile the target's property schedule, proposed price allocation and election terms before a buyer relies on a projected depreciation benefit.
Start with the transaction the documents actually create
Plain stock acquisition: The buyer's cost is generally attached to the acquired stock, not automatically to the target's warehouse, office or rental building. The target continues its existing tax asset schedule. A shareholder's stock basis and a corporation's inside building basis are separate records; the IRS stock-basis guidance addresses the shareholder side, while IRS Publication 551 explains adjusted basis for property. A new owner cannot claim a depreciation step-up simply by ordering a new study after closing.
Actual asset purchase: If the buyer instead acquires the building or business assets, identify the buyer's cost assigned to land, building, equipment and other property. Land is not depreciable. Any engineering-based cost-segregation work starts with substantiated asset basis and placed-in-service facts, not the total enterprise price. AE's purchase-price allocation guide explains why a business acquisition must be allocated across asset classes before depreciation is modeled.
Qualified stock deal with a valid deemed-asset election: Under a properly made Section 338(h)(10) or applicable Section 336(e) election, the tax result can include a deemed asset sale and new asset basis for the target. Eligibility, buyer form, seller participation, timing and allocation must be proven; not every S-corporation stock deal qualifies. The IRS Form 8023 instructions explain the Section 338 election framework, while Form 8883 instructions explain the deemed price and asset allocation. Do not use a study proposal as a substitute for an effective election.
Model the building basis before projecting accelerated depreciation
Assume a buyer offers $12 million for stock in an S corporation with an operating business and a warehouse. The warehouse's fair market value may be $6 million, while the target's existing adjusted tax basis in its property is far lower. In a plain stock deal, neither the $12 million share price nor the $6 million warehouse value automatically becomes new depreciable warehouse basis. A study can evaluate whether the corporation's existing tax asset schedule misclassified some of its remaining basis, but the prior placement and depreciation history control what may be corrected.
Now assume the parties instead complete a qualifying transaction and a valid deemed-asset election. The acquisition documents and tax rules determine the buyer-side deemed asset basis; it is not necessarily equal to a broker's stand-alone warehouse valuation, because liabilities and other acquired assets matter. Allocate that basis between land and depreciable assets, then ask the study team to identify supportable shorter-lived components. Compare that benefit with the seller's election cost and negotiated price. AE's seller-side 338(h)(10) price-floor guide addresses the opposite negotiating position.
Even when new depreciable basis exists, a cost-segregation report does not guarantee an immediate usable deduction. Asset classification, the applicable acquisition-date bonus-depreciation rules, prior use, related-party limits, placed-in-service date, and S-corporation shareholder basis or activity limits require separate review. The IRS cost-segregation examination guide emphasizes a supportable property-level classification and documentation, not a percentage of the headline purchase price.
A pre-closing decision path for the buyer
- Identify the legal buyer and assets. Is a corporation buying stock, or is another buyer purchasing assets? Confirm which entity will hold and depreciate the real estate after closing.
- Obtain the target's tax schedules. Tie the building's original basis, land allocation, additions, disposals, and depreciation claimed to prior returns. Separate a possible lookback study on old basis from an anticipated study on new basis.
- Test election eligibility before promising savings. Review the buyer's form, acquisition percentage and period, shareholder consent, required statements, and deadlines with transaction tax counsel. If the election is not available or not agreed, use the stock-basis model.
- Reconcile the purchase-price workpaper. For a deemed or actual asset purchase, allocate the proper tax purchase price among all acquired assets before sizing the real-estate study. Model seller price concessions, state tax and later recapture instead of reporting only a first-year deduction.
- Coordinate the return package. Match the executed transaction, elections, Form 8883 if applicable, target and buyer returns, fixed-asset schedules, and study report. Decide whether an existing-method error needs a separate correction procedure; Form 3115 is not automatically required by a stock purchase.
Records to gather and expensive mistakes to avoid
- Signed letter of intent and acquisition agreement; buyer entity documents; stock or asset transfer records; election clauses and consents.
- Target's last several returns, depreciation schedules, land and building allocations, construction invoices, prior studies, and entity/shareholder basis records.
- Debt and working-capital schedules, appraisals, purchase-price allocation, title records, and the actual asset placed-in-service dates.
- State and local tax assumptions, seller election-price model, and any rental activity or shareholder-basis limitation workpapers.
Do not confuse stock premium with building basis. Do not assume a 338(h)(10) election from a clause that never became effective. Do not classify the entire acquisition price as real estate or treat an engineering report as proof of transaction tax basis. And do not promise that every reclassified asset qualifies for current-year bonus depreciation or that every loss reaches the new shareholder's return.
Bring the draft agreement, target tax basis schedule and property records to AE before the election deadline or first post-close return. A coordinated transaction-and-study review can identify whether the opportunity is a fresh-basis study, a lookback on existing basis, or no worthwhile study at all.
Related AE guidance
This is a federal framework, not a conclusion that any particular acquisition qualifies for an election, a new asset basis, bonus depreciation, or a currently deductible loss. Contract terms, ownership, liabilities, prior elections, state law, and the returns can change the answer. Have transaction and tax advisers verify the facts before signing or filing.