ℹ Note
Goodwill is the residual after every identifiable asset and liability of the target has been measured at fair value on the acquisition date. The IFRS 3 formula is: Consideration Transferred + Non-Controlling Interest + Fair Value of Previously Held Interest − Net Fair Value of Identifiable Assets and Liabilities. The smaller the goodwill line, the more rigorous the purchase price allocation. A bloated goodwill line is usually a sign that identifiable intangibles have been missed.
The formula
The goodwill formula is set out in IFRS 3 paragraph 32. The acquirer measures goodwill as the excess of (a) the aggregate of the consideration transferred, the amount of any non-controlling interest in the acquiree, and the acquisition-date fair value of any previously held equity interest, over (b) the net of the acquisition-date amounts of the identifiable assets acquired and the liabilities assumed, measured in accordance with the standard.
| Goodwill formula component |
Source |
| Consideration transferred |
Fair value of cash, shares, and contingent consideration paid |
| Non-controlling interest |
Either fair value or proportionate share (IFRS 3 §19) |
| Previously held interest |
Fair value of any pre-existing equity stake in the acquiree |
| Less: Net identifiable assets |
Identifiable assets less liabilities assumed, all at fair value |
| = Goodwill |
The residual |
In equation form: Goodwill = Consideration Transferred + Non-Controlling Interest + Fair Value of Previously Held Interest − Net Fair Value of Identifiable Assets and Liabilities. Every one of those terms is measured at acquisition-date fair value. If the result is negative, you do not have goodwill — you have a bargain purchase, which IFRS 3 paragraph 34 requires to be recognised in profit or loss after a reassessment of the inputs.
★ Key Takeaway
Goodwill is a residual, not a valuation. You do not calculate goodwill by valuing goodwill. You calculate every other line, and goodwill is what is left.
Worked example: a £25m UK acquisition
Acquirer Ltd acquires 100% of Target Ltd on 31 May 2026 for £25.0m cash. No previously held equity interest, no non-controlling interest. Below is the line-by-line working.
Step 1 — Consideration transferred
Consideration transferred is measured at acquisition-date fair value under IFRS 3 paragraph 37. For a cash deal, that is the cash paid. For share consideration, it is the market value of the shares issued on the acquisition date. For deferred or contingent consideration, it is the fair value of the future payment stream.
| Component |
£m |
| Cash on completion |
25.0 |
| Shares issued |
— |
| Contingent consideration |
— |
| Consideration transferred |
25.0 |
Step 2 — Identify and measure identifiable assets
Identifiable assets include both tangible and intangible items. The discipline is to identify every intangible that meets the IFRS 3 paragraph B31–B40 separability or contractual-legal criteria, and to measure each at fair value.
| Identifiable asset class |
£m |
| Property, plant and equipment |
2.5 |
| Net working capital (receivables, inventory, payables) |
1.8 |
| Cash and equivalents |
0.7 |
| Customer relationships (5-year average life) |
3.2 |
| Technology and software |
1.6 |
| Trade names |
0.9 |
| Order backlog |
0.3 |
| Total identifiable assets at fair value |
11.0 |
The four intangible lines — customer relationships, technology, trade names and order backlog — are what separates a rigorous calculation from a lazy one. Acquirers who skip the intangible identification step push the entire economic value of the target into goodwill, breach IFRS 3 paragraph 18, and trigger annual impairment testing on a number that should have been amortised against earnings.
Step 3 — Identify and measure liabilities assumed
| Liability class |
£m |
| Trade and other payables |
0.6 |
| Bank borrowings |
1.4 |
| Deferred tax liability on uplifts |
1.0 |
| Total liabilities assumed at fair value |
3.0 |
The deferred tax line is the one most frequently mis-stated. Fair-value uplifts to identifiable intangibles create a temporary difference between book and tax base; that difference must be recognised as a deferred tax liability under IAS 12 paragraph 19, and it reduces net identifiable assets accordingly.
Step 4 — Calculate net identifiable assets
Net identifiable assets = Total identifiable assets − Total liabilities assumed
= £11.0m − £3.0m = £8.0m.
Step 5 — Apply the goodwill formula
✔ Example
Goodwill = Consideration Transferred + NCI + Previously Held Interest − Net Identifiable Assets
= £25.0m + £0 + £0 − £8.0m
= £17.0m.
Of the £25m paid, £8m sits in identifiable net assets, £6m sits in separately identifiable intangibles (customer relationships, technology, trade names, order backlog combined), and £17m is the residual goodwill line. The intangibles will amortise through P&L over their useful economic lives; the goodwill line will not amortise under IFRS but will be tested for impairment every year.
Why goodwill is a residual, not a valuation
Goodwill is not an asset you can point to. It is what the acquirer paid for synergies, assembled workforce (which is not separately recognisable under IFRS 3 paragraph B37), market positioning, expected future growth, and the simple fact that the target was worth more as a going concern than the sum of its separately measurable parts.
That residual character matters because it changes how the figure is governed. A valuation of customer relationships using multi-period excess earnings is defended on cash flow, attrition and contributory asset charges. A goodwill figure is defended only by the rigour of every line above it. There is no goodwill model to challenge — only the assumption that nothing was missed.
The smaller the goodwill, the stronger the underlying allocation. Auditors, PE valuation committees and tax authorities all read a high goodwill line as a signal that the purchase price allocation was thin. Founders selling into a strategic buyer should expect the buyer's auditor to push hard on intangible identification precisely to keep goodwill low.
Identifying separable intangibles before you arrive at goodwill
Before the goodwill figure can be computed, every separately identifiable intangible asset must be recognised at fair value. IFRS 3 paragraph B31 sets out two tests: an intangible is identifiable if it is either separable (capable of being sold, licensed, transferred or exchanged, individually or together with a related contract) or contractual-legal (arising from contractual or legal rights, regardless of whether those rights are transferable).
The five most commonly recognised intangible classes in a typical mid-market acquisition are:
| Intangible class |
Recognition basis |
Typical valuation method |
| Customer relationships |
Separable |
Multi-period excess earnings (MPEEM) |
| Technology and software |
Separable + contractual-legal |
Relief from royalty (RFR) |
| Trade names and trademarks |
Contractual-legal |
Relief from royalty (RFR) |
| Order backlog |
Contractual-legal |
Margin in backlog |
| Non-compete agreements |
Contractual-legal |
With-and-without (W&W) |
If the acquirer fails to recognise these, the missed value piles into goodwill — distorting the balance sheet, deferring the amortisation that should have hit earnings, and creating a future impairment risk that the audit committee will eventually have to answer for.
ℹ Note
Assembled workforce is explicitly excluded from separate recognition under IFRS 3 paragraph B37. The cost of replacing a workforce is part of goodwill, even where it is materially valuable.
IFRS 3 measurement period rules
IFRS 3 paragraph 45 grants a measurement period during which the acquirer can adjust the provisional amounts recognised at the acquisition date. The measurement period cannot exceed twelve months from the acquisition date and ends as soon as the acquirer receives the information needed to finalise the accounting (paragraph 45).
★ Key Takeaway
Three rules govern the measurement period — retrospective adjustment, acquisition-date conditions only, and a twelve-month hard stop.
Rule 1 — Retrospective adjustment. Provisional amounts are adjusted retrospectively, as if the accounting for the business combination had been completed at the acquisition date (paragraph 49). The comparative information for prior periods is restated, including any change in depreciation, amortisation or other income effects.
Rule 2 — New information about acquisition-date conditions. Only information about facts and circumstances that existed at the acquisition date can be reflected through measurement-period adjustments (paragraph 47). Post-acquisition events are accounted for in profit or loss, not retrospectively.
Rule 3 — Twelve-month hard stop. After the measurement period ends, any change in the goodwill figure or the identifiable assets and liabilities is treated as a correction of an error under IAS 8 if it relates to acquisition-date facts, or as a current-period adjustment otherwise.
| Measurement period item |
IFRS 3 reference |
Practical effect |
| Maximum duration |
Paragraph 45 |
Twelve months from acquisition date |
| Retrospective adjustment |
Paragraph 49 |
Prior-period comparatives restated |
| Acquisition-date conditions only |
Paragraph 47 |
Post-acquisition events go to P&L |
| Post-period changes |
IAS 8 |
Treated as error correction or current-period |
In practice, the measurement period is the window in which the PPA gets finalised. A provisional goodwill figure recognised on completion is replaced by the final figure once the purchase price allocation work has been completed by the independent valuer.
Annual impairment testing — no amortisation under IFRS
IFRS does not permit goodwill to be amortised. Instead, IAS 36 paragraph 10 requires that goodwill be tested for impairment at least annually, and more frequently if there are indicators of impairment. The test is performed at the cash-generating unit (CGU) level to which goodwill has been allocated.
The annual test compares the recoverable amount of the CGU (the higher of fair value less costs of disposal and value in use) with its carrying amount. If carrying amount exceeds recoverable amount, an impairment loss is recognised — first against goodwill, then pro rata against the other assets of the CGU.
⚠ Warning
Under US GAAP ASC 350, private companies and not-for-profits can elect to amortise goodwill over up to ten years, and qualifying alternative entities can apply a simplified impairment test. Public companies under ASC 350 follow a similar no-amortisation, annual-test model to IFRS. If your group reports under both, the goodwill line will sit at different values in the two sets of accounts.
Under FRS 102 in the UK, goodwill arising on a business combination is amortised over its useful economic life (paragraph 19.23), which is presumed to be ten years if a reliable estimate cannot be made. Groups switching from FRS 102 to IFRS need to unwind the amortisation and put goodwill back to gross.
Common mistakes founders and CFOs make
Five mistakes recur on almost every acquisition we see.
⚠ Warning
Each of these is a recurring audit-committee discussion item — and each is avoidable with a properly scoped purchase price allocation.
Mistake 1 — Stuffing the intangibles line into goodwill. Customer relationships, technology and trade names get rolled into goodwill because the acquirer either does not commission a PPA or commissions one with no time pressure. The audit committee inherits an impairment risk that should never have been there.
Mistake 2 — Forgetting the deferred tax liability on fair-value uplifts. The DTL is part of liabilities assumed and reduces net identifiable assets. Acquirers who ignore it understate goodwill at completion and overstate it after the auditor's review — a particularly painful set of journals to post.
Mistake 3 — Treating contingent consideration as zero. Contingent consideration is measured at acquisition-date fair value, even where the trigger conditions are uncertain. Subsequent remeasurement of equity-classified contingent consideration sits in equity; liability-classified contingent consideration is remeasured through P&L each period.
ℹ Note
The single most common audit adjustment we see on mid-market goodwill calculations is the deferred tax liability on intangible uplifts. If the intangible work is done properly but the DTL is missed, goodwill is overstated by 25-27% of the intangible value at typical UK rates.
Mistake 4 — Using the non-controlling interest line as a plug. NCI must be measured under IFRS 3 paragraph 19 either at fair value (the full goodwill method) or at the proportionate share of identifiable net assets (the partial goodwill method). The choice is made transaction by transaction and disclosed.
Mistake 5 — Stopping at the formula. The formula gives you a number. The defence of that number lives in the workpapers — the valuation reports for each identifiable intangible, the deferred-tax computation, the contingent-consideration valuation, the measurement-period correspondence. Without the workpapers, the figure is indefensible at any subsequent audit or due diligence cycle.
Where to go next
If you are sitting in front of a deal, the next steps are operational, not theoretical.
✔ Example
A buyer that runs intangible identification at heads of terms typically produces a goodwill line 30-50% smaller than a buyer that waits for the auditor to ask the question post-completion.
Related articles. IFRS 3 vs ASC 805: PPA comparison shows how the same acquisition produces different goodwill numbers across UK and US frameworks. Brand valuation formula: Relief from Royalty in practice covers the largest single identifiable intangible that PPA work typically surfaces — the line that comes out of goodwill before the formula resolves.
Run the numbers on your own balance sheet. See how Opagio Intangibles walks through intangible identification and the goodwill reconciliation on your own deal data — the work that needs to come out of goodwill before the formula is applied.
Tony Hillier is Co-Founder of Opagio. Thirty years in structured finance and corporate transactions, ex-NM Rothschild and GEC Finance. Opagio builds the intangible asset evidence platform that institutional investors expect. About the team →
