Purchase price allocation (PPA) in one line: when one company buys another, PPA is the accounting process that splits the price paid across the target's identifiable assets and liabilities at fair value, with whatever is left over recorded as goodwill. It answers a single question — what did the buyer actually pay for — and it is the reason goodwill exists on balance sheets at all.
Every time one company acquires another, accountants face the same question: what exactly did the buyer pay for, and how should that purchase price be recorded on the combined balance sheet? The answer is purchase price allocation (PPA) — the process of allocating the total purchase price across the target's identifiable assets and liabilities at fair value, with anything left over recorded as goodwill.
Why book value isn't enough
Before a deal closes, the target's balance sheet reflects historical cost accounting: property was recorded at what it cost years ago, inventory at production cost, and so on. But an acquirer isn't paying based on those historical numbers — it's paying based on what the assets and the business are worth today. PPA reconciles the two by restating the target's identifiable assets and liabilities to fair value as of the acquisition date, under US GAAP (ASC 805) and IFRS (IFRS 3).
Step-ups: where the extra value goes
When an asset's fair value exceeds its book value, the difference is called a step-up. Step-ups commonly arise on property, plant & equipment (PP&E) and on intangible assets that weren't previously recognized on the target's balance sheet at all — customer relationships, technology, trade names, and similar items that an acquirer's due diligence team identifies and values separately. Each step-up then amortizes over its own useful life, creating incremental depreciation and amortization (D&A) that didn't exist on either company's standalone income statement before the deal.
Goodwill: the residual, not a target
Once every identifiable asset and liability has been restated to fair value, there's usually still a gap between the total purchase price and the fair value of net identifiable assets. That gap is goodwill — compensation for things that can't be individually identified and valued, like synergies, an assembled workforce, or brand reputation the acquirer is willing to pay a premium for. A common misconception is treating goodwill as something the acquirer deliberately "buys" — in reality, it's simply the plug that makes the accounting balance.
Unlike step-ups, goodwill is not amortized under current US GAAP or IFRS. Instead, it sits on the balance sheet indefinitely and is tested for impairment at least once a year (or more often if a triggering event occurs, like a sharp drop in the acquired business's performance).
How PPA flows through the numbers
PPA isn't just a balance sheet exercise — it has a direct, ongoing impact on the combined company's income statement. The incremental D&A created by step-ups reduces EBIT and net income for as long as the underlying assets amortize, and whether that hit is tax-deductible depends entirely on how the deal is structured (an asset deal or a stock deal with a 338(h)(10) election gets a tax basis step-up; a plain stock deal typically doesn't). Anyone building a merger model needs these figures to get pro-forma earnings right.
Want to see the full mechanics worked through with real numbers — fair value step-ups, goodwill, incremental D&A, and the after-tax earnings impact? Walk through the Purchase Price Allocation (PPA) case study, which builds the entire allocation from a set of acquisition terms step by step.
PPA also feeds directly into accretion/dilution analysis — the incremental D&A from step-ups is one of the standard adjustments that separates a naive EPS estimate from an accurate one.
A Fully Worked PPA Example
The mechanics are much easier to see with numbers than in the abstract. Assume Buyer acquires Target for $1,000m in cash. Target's book value of equity is $400m. During diligence the valuation team identifies two categories of fair value adjustment, and the applicable tax rate is 25% (0.25).
| Step | Item | Amount |
|---|---|---|
| 1 | Purchase price paid | $1,000.0m |
| 2 | Target book value of equity | $400.0m |
| 3 | PP&E written up to fair value | +$120.0m |
| 4 | Identifiable intangibles recognised (customer relationships, technology, brand) | +$250.0m |
| 5 | Deferred tax liability on the step-ups, 25% (0.25) x $370.0m | −$92.5m |
| 6 | Net identifiable assets at fair value | $677.5m |
| 7 | Goodwill = $1,000.0m − $677.5m | $322.5m |
Three things in that table are worth dwelling on, because each is a standard follow-up question.
Goodwill is a residual, not an estimate. Nobody values goodwill directly. It falls out as the plug once everything identifiable has been fair-valued — which means the harder the valuation team works to identify intangibles, the smaller goodwill becomes. A deal with unusually large goodwill often signals either a genuine premium for synergies and workforce, or an allocation exercise that did not dig very deep.
The step-ups create a deferred tax liability. Tax authorities generally do not recognise the write-up, so the company will book book-basis depreciation and amortisation it cannot deduct. That future tax cost is recorded immediately as a DTL of $92.5m, and because it reduces net identifiable assets it increases goodwill by the same amount. If the mechanics of that entry are unclear, work through deferred taxes first.
The allocation is not cosmetic — it hits future earnings. Suppose the customer relationships are amortised over 10 years and the PP&E step-up depreciated over 12. That adds $250.0m / 10 = $25.0m plus $120.0m / 12 = $10.0m, or $35.0m per year of incremental pre-tax D&A. After tax at 25% (0.25) that is a $26.3m annual drag on reported net income, and the DTL unwinds by $35.0m x 25% = $8.75m each year as it reverses.
This is precisely why an acquisition can be accretive on a cash basis and dilutive on a reported-EPS basis at the same time, and why buyers so often guide to "cash EPS" excluding acquired intangible amortisation. Run the same numbers through a merger consequences model to see the effect on the combined income statement.
Frequently Asked Questions About Purchase Price Allocation
What does purchase price allocation mean in plain terms? It means deciding, line by line, what the buyer bought. The price is split across everything identifiable at fair value, and the unexplained remainder becomes goodwill.
Is goodwill amortised? Not under IFRS or US GAAP. It sits on the balance sheet indefinitely and is tested for impairment at least annually — which is why goodwill write-downs arrive as sudden, large, non-cash charges rather than as a steady expense. The full mechanic is in goodwill: creation and impairment, and the three-statement impact in writing down goodwill by $100.
Can goodwill be negative? Yes, though it is rare. If the price paid is below the fair value of net identifiable assets you have a bargain purchase, and the difference is recognised immediately as a gain in the income statement rather than as an asset. It usually signals a distressed seller.
How long does a PPA take? Accounting standards allow a measurement period of up to twelve months after closing to finalise fair values, so the goodwill figure reported immediately after a deal is frequently provisional and gets restated later.
Where does PPA show up in interviews? Most often as a follow-up to an accretion/dilution question, or as part of a broader purchase accounting walkthrough. If you want the structured answer framework rather than the concept, use how to answer a purchase price allocation interview question, and practise the calculation itself in the PPA case.