Introduction
When Chevron completed its acquisition of Hess in July 2025, paying almost entirely with 301 million of its own shares, it valued the business at about $48 billion and recorded $73.5 billion of property, plant and equipment, mostly oil and gas fields in Guyana, the United States and Malaysia. Alongside those assets it recorded $11.0 billion of deferred income taxes. By the end of the year, Chevron's total deferred tax liabilities had risen by $14.9 billion, a rise its 2025 annual report attributes to the acquisition of Hess.
None of that is a tax bill. Because Chevron acquired Hess's shares, Hess's oil and gas properties kept their existing tax bases, while the books recorded them at fair value. The liability measures the tax that difference will cost over time, and it shapes the buyer's goodwill, its earnings for years afterwards and the gap between its book and cash taxes.
Why Buying Shares Creates a Deferred Tax Liability
When a buyer acquires a company's shares, the company stays the same taxpayer. Its assets retain their carryover tax basis, whatever price the buyer paid for the stock. The acquisition method, by contrast, records every identifiable asset at its fair value at closing, including intangibles the target never carried, such as customer relationships and developed technology. After the deal, every written-up asset has a book value above its tax basis.
- Carryover basis
The tax basis that an acquired company's assets keep after a change in ownership of its shares. Because the buyer purchased stock rather than the assets themselves, tax depreciation and amortization continue from the target's historical amounts, and the premium the buyer paid generates no new tax deductions unless an election treats the deal as an asset purchase.
The gap is a taxable temporary difference. As the buyer depreciates and amortizes the higher book values, its tax returns deduct only the old, lower amounts, so taxable income on those assets exceeds book income. Accounting Standards Codification (ASC) 740 requires the future tax on that excess to be recognized at closing, as a deferred tax liability equal to the write-up multiplied by the enacted tax rate, the principle explained in deferred tax liabilities. Write-downs work in reverse, creating deferred tax assets.
The Liability Raises Goodwill
Because goodwill is the residual of the allocation, every dollar of deferred tax liability adds a dollar to goodwill. Suppose a buyer pays $2,000 for a company's shares. The target's net assets have a book value and tax basis of $800, and the allocation writes up its intangible assets by $600 and its property by $200. At a 25% rate, the $800 of write-ups creates a deferred tax liability of $200. Identifiable net assets are therefore $1,400, and goodwill is $600. Without the deferred tax, it would be $400.
The result has an economic logic. Valuers usually include a tax amortization benefit in the fair value of intangibles, as though their amortization were deductible; in a stock deal the buyer receives no such deductions, and the liability corrects for it. The full allocation is covered in purchase price allocation.
No Deferred Tax on Goodwill Itself
Goodwill is also a book-tax difference: in a stock deal its tax basis is usually zero. Yet no liability is recorded on it, because one would raise goodwill, requiring a larger liability, in an endless loop. ASC 805-740 breaks the loop by prohibiting deferred taxes on goodwill that is not deductible for tax, both at the acquisition date and afterwards, as PwC's guide to deferred taxes on acquired goodwill explains. Chevron recorded no goodwill at all on Hess, so its $11.0 billion relates entirely to the identifiable assets and liabilities, of which the oil and gas properties make up most.
How the Liability Unwinds
The liability is temporary. As the written-up assets are depreciated, amortized or sold, the difference between book value and tax basis shrinks, and the liability is released into the income statement as a deferred tax benefit. That benefit offsets the tax effect of the extra amortization, so the buyer's book tax rate on the write-ups stays at the statutory rate, even though the amortization saves no cash tax.
Continuing the example, assume the target earns $1,000 a year before the deal-related amortization, and that the $600 intangible write-up is amortized over five years. The $150 of deferred tax attached to it unwinds by $30 a year:
| Line item | Year 1 | Year 5 | Year 6 |
|---|---|---|---|
| Income before amortization of the write-up | 1,000 | 1,000 | 1,000 |
| Amortization of the write-up | (120) | (120) | 0 |
| Pre-tax income | 880 | 880 | 1,000 |
| Current tax, on 1,000 of taxable income at 25% | (250) | (250) | (250) |
| Deferred tax benefit as the liability unwinds | 30 | 30 | 0 |
| Net income | 660 | 660 | 750 |
| Deferred tax liability on the write-up, end of year | 120 | 0 | 0 |
The target keeps its old tax basis, so the amortization of the write-up is not deductible. Book tax expense of 220 equals 25% of book pre-tax income, while cash tax stays at 250.
In each of the first five years, the company reports tax expense of $220 but pays $250. Over the five years, the difference adds up to the original $150 liability, which is then gone.
Liabilities That Do Not Unwind on Their Own
The pace of unwinding follows the asset. Deferred taxes on an inventory step-up reverse within months, as the inventory is sold. Those on property and finite-lived intangibles reverse over their useful lives, and for oil and gas fields, as the reserves are produced. But deferred taxes on indefinite-lived intangibles, such as an established trade name, stay on the balance sheet indefinitely, because the asset is not amortized for the books. They reverse only if the asset is impaired or sold, and an impairment brings a matching deferred tax benefit that softens the charge, as covered in goodwill and goodwill impairment.
A taxable sale of the assets crystallizes the liability: the tax gain is measured from the old, low basis, so a buyer that later sells the assets of a business bought in a stock deal, rather than its shares, can owe far more tax than its book gain implies.
When the Buyer Gets a Stepped-Up Tax Basis
In an asset purchase, compared in stock deals vs asset deals, or a share purchase treated as one for tax through an election, the buyer's tax basis in each asset is reset to the price paid. The write-ups are matched by higher tax bases, so most of the deferred tax liabilities never arise, and goodwill and intangibles become deductible over fifteen years for US federal tax. Buyers negotiate for those deductions through the deal structure and the elections under Sections 338(h)(10) and 336(e).
Tax-deductible goodwill brings its own rules. At closing, goodwill is split in two. The first component, the smaller of book and tax-deductible goodwill, builds up a deferred tax liability as tax amortization runs ahead of the unamortized book amount. Any excess of book over tax goodwill carries no deferred tax, as with nondeductible goodwill.
Tax Goodwill Above Book Goodwill
When tax-deductible goodwill exceeds book goodwill, the excess creates a deferred tax asset at closing. That asset reduces book goodwill, which increases the excess, so the calculation uses a simultaneous equation, as explained in Deloitte's roadmap on temporary differences in business combinations.
The Target's Own Tax Assets
The target's tax attributes come with it in a stock deal. Its net operating losses, tax credit carryforwards and deductible temporary differences are recognized as deferred tax assets in the allocation, and the buyer must judge whether a valuation allowance is needed, counting the combined group's future income only where tax law lets the attributes be used against it. Chevron's deferred tax assets rose by $8.9 billion in 2025, mainly from foreign tax credits and tax loss carryforwards acquired with Hess, while its valuation allowance, which covers foreign tax credits, loss carryforwards and temporary differences, rose by $5.5 billion.
The use of acquired losses is often restricted. After an ownership change, Section 382 caps the losses a company can use each year, as described in Section 382 limits on acquired NOLs, and the deferred tax asset and its valuation allowance must reflect that cap. Changes during the measurement period that reflect facts existing at the acquisition date adjust goodwill; later changes run through income tax expense, the treatment described in deferred tax assets and valuation allowances.
What Bankers Do With Acquisition Deferred Taxes
In a merger model, the deferred tax liability is calculated as the estimated write-ups multiplied by the tax rate and added to goodwill, while the new depreciation and amortization is tax-effected at the statutory rate for pro forma earnings. That is the convention in accretion and dilution analysis. The cash flow forecast needs separate care: in a stock deal without an election, the write-ups generate no tax deductions, so cash taxes should be modeled from the target's tax basis, not from book depreciation.
Deferred tax liabilities created by acquisition write-ups are generally not treated as debt in the bridge from equity value to enterprise value. They unwind through book entries rather than payments, and their economic cost is already in a forecast that models cash taxes properly; counting them as debt as well would penalize the business twice. The exception is a business whose assets are likely to be sold in a taxable transaction, where the liability can turn into cash tax on the sale.
