What is purchase price allocation and why does it matter post-acquisition?

Q: The allocation waterfall

Purchase Price Tangible assets & liabilities at fair value PP&E, inventory, receivables, financial instruments, debt Identified intangibles Brand, customer lists, technology, IP → amortised over useful life Goodwill Residual — not separately identifiable → annual impairment test, no amortisation Both recorded on acquirer's con

When a company acquires another, it does not simply add the target's book value to its balance sheet. Every identifiable asset and liability must be revalued at fair market value, the purchase price must be allocated across them, and whatever remains becomes goodwill. This process — purchase price allocation — creates accounting consequences that ripple through the income statement for a decade or more.

In brief: Purchase price allocation (PPA) is the accounting exercise required after an acquisition under both IFRS 3 and ASC 805 (US GAAP). The acquirer must measure all acquired assets and liabilities at fair value on the acquisition date. The excess of the purchase price over the net fair value of those assets becomes goodwill — an asset sitting on the balance sheet that must be tested annually for impairment.

Why fair value differs from book value

A company's books carry assets at historical cost (or cost less accumulated depreciation), which often diverges substantially from current market value. A factory built in 2005 might be carried at £10 million on the balance sheet but have a current replacement value of £35 million. A brand built over decades might have zero book value — because internally-developed intangibles are generally not capitalised under accounting standards — but have enormous economic value to an acquirer willing to pay a premium for it.

PPA forces this revaluation to occur at the moment of acquisition, making the combined entity's balance sheet reflect economic reality rather than accounting history.

The allocation waterfall

What gets separately identified

The PPA exercise requires identifying and valuing all intangible assets that can be separately recognised from goodwill. These typically include: customer relationships and long-term contracts, brand names and trade marks, developed technology and software, in-process research and development, non-compete agreements, and order backlogs. Each is assigned a fair value using established valuation techniques: the income approach (discounting cash flows attributable to that specific asset), the relief-from-royalty method (for brands and licences), or the cost approach (for internally-developed assets).

Goodwill is the residual — the difference between the total purchase price and the fair value of all identified net assets. It represents everything the acquirer paid for that cannot be separately attributed: the assembled workforce, future growth optionality, expected synergies, and any premium paid in a competitive auction process.

20–40% Proportion of purchase price typically allocated to identified intangible assets in technology and consumer brand acquisitions. In industrial transactions with limited intellectual property, this can fall to 5–10%.

The income statement impact

This is where PPA becomes consequential for analysts building post-acquisition models. Identified intangible assets must be amortised over their estimated useful lives — typically 3–20 years depending on the asset type. Customer relationships are often amortised over 7–15 years; developed technology over 3–8 years; trade marks sometimes indefinitely if there is no foreseeable limit to their useful life.

This amortisation flows through the income statement as an operating expense, reducing reported operating profit and net income. A business acquired for £500 million with £150 million allocated to customer relationships (amortised over 10 years) generates £15 million per year of additional amortisation expense — before any acquisition synergies or integration costs. This amortisation drag is the primary reason post-acquisition reported earnings and adjusted (add-back) earnings can diverge so significantly.

Understanding PPA is critical for building post-acquisition earnings models. The amortisation of acquired intangibles can suppress reported earnings for a decade after a deal closes — not because the business is underperforming, but because of accounting mechanics entirely disconnected from cash generation.

Goodwill: the residual that never leaves

Unlike identified intangibles, goodwill is not amortised under either IFRS or current US GAAP. Instead, it sits on the balance sheet indefinitely and is tested annually for impairment. If the recoverable value of the cash-generating unit falls below the carrying value of the net assets including goodwill, the difference must be written down — a non-cash impairment charge that flows through the income statement and can run to billions of pounds in major acquisitions that underperformed.

Goodwill impairments are one of the clearest signals that an acquisition overpaid. When a company writes down £2 billion of goodwill five years after a deal, it is effectively admitting that it paid far more than the business was worth — something that is invisible in financial statements at the time of the acquisition.

IFRS vs US GAAP: Both frameworks require PPA under acquisition accounting. A key historical difference: US GAAP once required goodwill amortisation over 40 years (eliminated in 2001 under SFAS 142), and IFRS considered reintroducing amortisation (debated 2019–2023 but ultimately not adopted). Currently, neither standard requires goodwill amortisation for public companies, though this accounting choice remains controversial among standard-setters.