An asset write-up is the accounting entry that raises an acquired company’s assets from their old book value to fair value on the acquirer’s balance sheet after an M&A deal closes. U.S. GAAP does not permit companies to revalue most assets upward under normal operations. Business combinations are the exception: the acquirer must restate every identifiable asset and liability of the target to fair value on the acquisition date, and the gap between the old book number and the new fair value is the write-up. That single adjustment shapes reported earnings and tax deductions for years afterward.
Why Acquisitions Trigger the Write-Up
The buyer just paid real money based on what the target’s assets are worth today, not what someone paid for them a decade ago. Carrying the target’s historical costs forward would misrepresent the economic cost of the deal. A factory the target bought for $2 million in 2010 might be worth $8 million now, and the acquirer’s balance sheet has to show that.
The mechanism for pushing those new values onto the balance sheet is purchase price allocation, or PPA. The total amount paid gets distributed across every asset and liability at fair value. Tangible assets like equipment and real estate are usually valued using replacement cost or market comparables. Inventory follows its own convention and is written up to expected selling price minus the costs to complete and sell it, plus a reasonable selling profit. Intangible assets that the target may never have carried on its own books, such as customer relationships, developed technology, and brand names, get identified, valued, and placed on the balance sheet for the first time. Whatever purchase price remains after every identifiable asset and liability has been assigned a fair value becomes goodwill.
Goodwill: The Residual
Goodwill captures what the buyer paid for things that cannot be separately identified and sold: assembled workforce, market position, expected synergies. It behaves unlike any other written-up asset. For financial reporting, goodwill is not depreciated or amortized. Instead, the company tests it for impairment at least once a year, comparing the fair value of the reporting unit to its carrying amount. If fair value has fallen below carrying amount, goodwill gets written down. It can never be written back up.1FASB. Goodwill Impairment Testing
A large goodwill balance says the buyer paid a substantial premium over the fair value of the target’s net identifiable assets. That’s typical in acquisitions of technology firms, professional services businesses, and other companies where the value sits in people and relationships rather than physical assets.
How the Write-Up Hits the Income Statement
The balance sheet effect is immediate: assets step up on day one. The more meaningful consequence shows up on the income statement every quarter after that. Written-up tangible assets carry a higher depreciable base. Written-up intangible assets carry a higher amortizable base. Both must be expensed systematically over their useful lives.
A machine written up from $1 million to $5 million creates an additional $4 million of depreciation expense. Straight-line over a ten-year remaining life, that’s $400,000 per year of extra charges running through operating income. Across a large deal with substantial intangibles, the drag can be significant and lasts as long as the acquired assets are on the books.
Because these charges are non-cash and tied to the deal rather than to operations, management and analysts usually track two different measures side by side:
- Net income, which includes all of the extra depreciation and amortization from the write-up. This is the GAAP figure and reflects the full accounting cost of the acquired assets.
- EBITDA, which strips out depreciation and amortization entirely. Since write-up charges are non-cash, EBITDA is unaffected by how aggressively the assets were written up.
Acquirers often label the extra charges “deal amortization” or “PPA amortization” in their earnings reports and present non-GAAP figures that back them out. Whether those adjusted numbers give a better picture of economic reality depends on whether the buyer overpaid, which the adjustments quietly sidestep.
What the Write-Up Does to Taxes
The tax consequences of an asset write-up depend almost entirely on how the deal is legally structured. The same economic transaction can produce sharply different tax outcomes depending on whether the buyer is purchasing assets or purchasing stock.
Asset Purchases Give the Buyer a Real Step-Up
In a direct asset purchase, the buyer’s tax basis in each acquired asset equals the portion of the purchase price allocated to that asset. The allocation follows the residual method in the tax code, assigning purchase price across asset classes in a set order with goodwill absorbing what’s left.2Office of the Law Revision Counsel. 26 USC 1060 – Special Allocation Rules for Certain Asset Acquisitions A written agreement between buyer and seller on the allocation binds both parties for tax purposes.
The stepped-up tax basis lets the buyer claim higher depreciation and amortization deductions going forward, directly reducing taxable income. These deductions are reported on IRS Form 4562.3Internal Revenue Service. Instructions for Form 4562
Stock Purchases Usually Don’t
Most large acquisitions are structured as stock purchases because contracts, permits, and licenses stay with the target entity without needing to be individually transferred. In a stock deal, though, the tax basis of the target’s underlying assets does not change. Assets keep their historical tax basis even though the buyer records them at fair value for financial reporting. The books show the write-up. The tax return does not. That mismatch is the source of the deferred tax liability discussed below.
Section 197: 15 Years on Acquired Intangibles
When the buyer does obtain a stepped-up tax basis, intangibles follow a special rule. Most acquired intangible assets must be amortized over a fixed 15-year period regardless of their actual useful life.4Office of the Law Revision Counsel. 26 USC 197 – Amortization of Goodwill and Certain Other Intangibles The list is broad and covers virtually every intangible a buyer would encounter:
- Goodwill and going concern value. Unlike financial reporting, tax goodwill from an asset purchase is deductible over 15 years, which is a major benefit.
- Customer-based intangibles, including customer lists and relationships.
- Workforce in place.
- Intellectual property, including patents, copyrights, formulas, processes, and designs.
- Covenants not to compete entered into as part of the acquisition.
- Trademarks, trade names, and franchises.
- Government licenses and permits.
The 15-year period is mandatory and cannot be shortened even when the intangible has a shorter expected life. A three-year non-compete acquired in a deal still amortizes over 15 years for tax purposes. Amortization starts in the month of acquisition and runs straight-line. For book purposes, that same non-compete might amortize over three years and a customer relationship over eight. Those differences generate temporary differences the company must track through deferred tax accounting.
Elections That Turn a Stock Deal Into an Asset Deal for Tax
Stock deals don’t automatically create a step-up, but two elections can produce one. Both treat the transaction as a deemed asset sale and repurchase for tax purposes.
The Section 338(h)(10) election lets a purchasing corporation treat a qualified stock purchase as a deemed asset purchase. The target is treated as if it sold all its assets at fair value, and the buyer is treated as if it bought them at that price.5Office of the Law Revision Counsel. 26 USC 338 – Certain Stock Purchases Treated as Asset Acquisitions The buyer must be a corporation. It must acquire at least 80% of the target’s voting power and value within a 12-month period. The target must be either a subsidiary of a consolidated group or an S corporation. Buyer and seller must jointly agree to the election and file it on IRS Form 8023. The election is irrevocable once made and must be filed by the 15th day of the ninth month after the month containing the acquisition date. Because the seller recognizes taxable gain on the deemed asset sale, the election requires agreement from both sides.
The Section 336(e) election covers cases where the buyer is not a corporation. It is available when the buyer is an individual, partnership, or other non-corporate entity. Another difference: the seller and target make this election without the buyer’s participation. It applies when a parent corporation disposes of at least 80% of a subsidiary’s stock in a qualified disposition. The tax effect is the same as under Section 338(h)(10): deemed asset sale, stepped-up basis in the target’s assets.
The Deferred Tax Liability When There’s No Step-Up
When a stock acquisition proceeds without one of these elections, the write-up exists only for financial reporting. Assets sit on the balance sheet at their new fair values while the tax return still uses the old historical basis. That gap creates a deferred tax liability on the acquirer’s balance sheet from day one.
The logic: the company will claim less tax depreciation (based on the lower tax basis) than the depreciation expense it reports to shareholders (based on the higher book basis). Over time, the company will pay more in taxes than the financial statements would imply. The DTL quantifies that future obligation. It equals the difference between book basis and tax basis multiplied by the applicable tax rate. At the current 21% federal corporate rate, a $10 million write-up with no matching tax basis increase produces a $2.1 million DTL. The DTL reduces the net fair value of the acquired assets recognized in the PPA, which in turn increases the goodwill recorded on the deal.
As the assets are depreciated for book purposes, the book-tax difference narrows and the DTL unwinds, reaching zero when the assets are fully depreciated on both sets of books. The DTL is non-cash and doesn’t require a payment at closing, but it reflects a real economic cost that affects the after-tax return on the deal.
Reading a Write-Up
The size of the write-up says something about the deal. A large write-up relative to the target’s book value suggests the target’s balance sheet significantly understated asset value, common when a company has held real estate for decades or developed valuable intellectual property that was never capitalized. A small write-up alongside a large goodwill balance says the buyer is paying primarily for synergies, market position, or growth expectations rather than identifiable asset value. The PPA disclosures in the financial statement footnotes lay out exactly how the purchase price was distributed, which intangibles were identified, what useful lives were assigned, and how much goodwill resulted. Those numbers drive reported earnings, tax deductions, and impairment risk for years after closing.