How the Goodwill Calculator works
When one company acquires another, it rarely pays a price that exactly matches the fair value of the assets it receives. The difference is goodwill — an intangible asset that captures the premium paid for things a balance sheet cannot fully itemize: brand reputation, customer relationships, assembled workforce, and expected synergies. This calculator applies the standard acquisition-accounting formula used under US GAAP (ASC 805) and IFRS (IFRS 3).
The formula
Goodwill is calculated in two steps. First, find the net identifiable assets acquired:
Net identifiable assets = Fair value of identifiable assets − Fair value of liabilities assumed
Then goodwill is the excess of what was paid over that net figure:
Goodwill = Purchase price + Fair value of noncontrolling interest − Net identifiable assets
The noncontrolling interest (NCI) term only applies when the acquirer buys less than 100% of the target and elects (or is required under IFRS) to measure goodwill on a "full goodwill" basis, which includes the minority shareholders' share. For a 100% acquisition, leave NCI at zero and the formula reduces to purchase price minus net identifiable assets.
Worked example
Suppose a buyer pays $5,000,000 for 100% of a company. An independent valuation puts the fair value of identifiable assets acquired (cash, receivables, equipment, patents, and so on) at $3,800,000, and the fair value of liabilities assumed at $900,000. Net identifiable assets are $3,800,000 − $900,000 = $2,900,000. Goodwill is then $5,000,000 + $0 − $2,900,000 = $2,100,000, or 42% of the purchase price — the amount the buyer recorded as an intangible asset for the workforce, customer base, and growth prospects it could not otherwise put a number on.
Goodwill versus a bargain purchase
If the formula produces a positive number, that amount is recognized on the balance sheet as goodwill, a long-lived intangible asset. If it produces a negative number, the buyer paid less than the fair value of what it received — this is called a bargain purchase. Accounting standards do not allow "negative goodwill" to sit as a liability; instead, the negative amount is recognized immediately as a gain in the acquirer's income statement in the period of acquisition, after the acquirer double-checks that all assets and liabilities were measured correctly.
Why goodwill is not amortized
Unlike most intangible assets, goodwill under current US GAAP and IFRS is not amortized on a schedule. It stays on the balance sheet at its recorded value and must be tested for impairment at least once a year, or sooner if a triggering event (a lost major customer, a market downturn, restated forecasts) suggests the business unit is worth less than its carrying amount. If the test shows impairment, the goodwill balance is written down through an expense — it can go down, but under standard practice it is never written back up.