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How do you allocate an intangible asset's cost over its useful life? Amortisation in accounting sits at the heart of this question. Whether you're managing patents, software licences, or goodwill from an acquisition, understanding how to systematically allocate intangible asset costs is important for both accounting and getting a good understanding about your business. Unlike depreciation (which applies to physical assets), amortisation spreads the expense of patents, trademarks, software, and other non-physical assets across the periods they generate value and is critical for accurate financial reporting, tax compliance, and strategic decision-making.
What is amortisation?
Amortisation is the process of spreading the cost of an intangible asset across the years it generates value. Rather than recording the full purchase price as an expense upfront, it is allocated in regular instalments, effectively matching the cost to the benefit over time.
For an asset to qualify as intangible, it must be identifiable, controlled by the business, and expected to generate future economic benefits. In practice, this covers a wide range of intangibles like:
- Patents and copyrights: legal protections with defined expiry dates.
- Software licences: both purchased and internally developed.
- Customer relationships: acquired through business combinations.
- Trademarks and trade names: when they have finite legal or economic lives.
- Franchise agreements: contractual rights with specified terms.
- Non-compete agreements: time-limited contractual restrictions.
The exact list varies under accounting standards and countries. Under UK GAAP and IFRS, intangible assets with finite useful lives must be amortised systematically over those lives, with the method reflecting the expected pattern of consumption of economic benefits.
How to calculate amortisation: the straight-line method
The most widely used approach is the straight-line method, which spreads an asset's cost evenly across its useful life. It's the default when there's no clear reason to expect an accelerated or decelerated amortisation.
The formula: Annual amortisation = (Asset cost - residual value) / useful life
In practice: A company acquires a patent for £140,000 with an estimated useful life of 10 years and no residual value.
Annual amortisation would be (£140,000 − £0) / 10 = £14,000 per year, or about £1,167 per month.
Each year, £14,000 is recognised as an expense on the P&L while the patent's carrying value on the balance sheet reduces by the same amount.
Amortisation begins when the asset is available for its intended use, meaning at the time when it's in the condition and location necessary to operate as management intended.
What are the main amortisation methods?
The straight-line method, as discussed above, is most widely used, but alternatives exist where a different pattern better reflects how the asset is utilised. Here are the three other main methods used in practice:
Reducing (declining) balance method
The reducing balance method applies a fixed percentage to the asset's declining book value, front-loading the expense in earlier years. This makes sense for technology assets that lose commercial value quickly. For example, a business might amortise proprietary software costing £50,000 at a 30% rate, recording a £15,000 expense in the first year, but only £10,500 in the second year as the book value drops to £35,000.
Units of production method
The units of production method ties amortisation directly to output or usage. It is useful when consumption genuinely tracks with production volume, though it requires reliable usage data. For instance, if a company acquires the rights to extract 100,000 ounces of a mineral for £2,000,000, it would amortise £20 for every ounce mined, matching the expense directly to the actual extraction volumes.
Revenue-based methods
Revenue-based amortisation is generally discouraged under IAS 38. Revenue can fluctuate because of pricing decisions, demand shifts, and competitive pressure meaning factors that have nothing to do with how much of the underlying asset has actually been used. There's a rebuttable presumption against this approach, with only limited exceptions.
For example, a company might acquire the rights to a toll road and wish to amortise the cost based on the percentage of total expected toll revenue collected each year. However, under standard IFRS rules, this is rarely permitted unless the right is specifically granted as a strict amount of revenue to be generated.
Building an amortisation schedule: what you need to know
An amortisation schedule shows how an asset's book value reduces period by period, providing a clear audit trail and simplifying reporting. For the £140,000 patent above, the first three years look like this:
| Period | Opening balance | Amortisation | Accumulated | Closing balance |
| Year 1 | £140,000 | £14,000 | £14,000 | £126,000 |
| Year 2 | £126,000 | £14,000 | £28,000 | £112,000 |
| Year 3 | £112,000 | £14,000 | £42,000 | £98,000 |
While developing an amortisation schedule is vital, deploying a modern treasury platform to automate its creation across multiple assets is equally essential. This mitigates the risk of manual error and ensures reporting remains robust as your asset base scales.
Amortisation vs depreciation: understanding the difference
Both concepts allocate asset costs over time, but they apply to different things. Depreciation covers tangible assets like buildings, machinery and vehicles. Amortisation covers intangible ones.
Here's a clear comparison:
| Feature | Amortisation | Depreciation |
| Asset type | Intangible assets (patents, software, licences) | Tangible assets (machinery, buildings, vehicles) |
| Residual value | Rarely has residual value (typically £0) | Often has residual/salvage value |
| Primary method | Straight-line (dominant in UK/IFRS) | Multiple methods common (straight-line, reducing balance, units of production) |
| Useful life driver | Legal/contractual terms, technological obsolescence | Physical wear and tear, usage patterns |
| Indefinite life assets | Not amortised; tested for impairment annually | Not applicable (all tangible assets have finite lives) |
| Examples | Patent amortised over 10 years; software licence over 3 years | Van depreciated over 5 years; factory over 25 years |
In practice, the differences go further. Intangible assets rarely carry a residual value, so amortisation typically runs down to zero. Straight-line is the dominant method for intangibles, while tangible assets use a wider range of approaches. And where the useful life of a physical asset is driven by wear and tear, the life of an intangible is more often set by its legal or contractual terms.
Not all intangibles are amortised. Assets with indefinite useful lives like certain brands or broadcasting licences aren't amortised, but must be tested for impairment at least annually.
Why amortisation matters for cash flow and finance teams
Amortisation is a non-cash expense. You've already paid for the asset; the periodic charge simply recognises that cost across your accounts over time. This has real implications.
It reduces operating profit on the P&L without touching your bank balance. On the cash flow statement, amortisation is added back in the operating activities section for exactly this reason. It's also why EBITDA (Earnings Before Interest, Taxes, Depreciation, and Amortisation) strips these charges out, giving a cleaner view of underlying operational cash generation.
For finance teams, accurate tracking matters beyond the P&L. Amortisation may be tax-deductible depending on the asset and applicable rules. Debt covenants can reference asset values, making precision essential for compliance. And understanding non-cash expenses improves cash flow forecasting, particularly when planning working capital over the medium term.
AI-powered finance platforms can now assist with automating impairment testing and monitoring goodwill values across complex group structures, flagging potential risks earlier and streamlining the annual review process for finance teams.
How does goodwill amortisation work in the UK?
Goodwill is the premium paid when acquiring a business above the fair value of its identifiable net assets. How it's handled depends on your reporting framework.
Under UK GAAP (FRS 102), goodwill must be amortised systematically over its useful life. Where a business can't make a reliable estimate, the period cannot exceed 10 years.
Under IFRS, goodwill isn't amortised at all. Instead, it's tested at least annually for impairment. If the recoverable amount falls below carrying value, an impairment loss is recognised and it cannot be reversed. The IASB considered reintroducing amortisation but voted in November 2022 to retain the impairment-only model, finding insufficient evidence to justify the change.
To conclude
By selecting the appropriate method and maintaining precise, error-free schedules, finance and treasury teams can ensure regulatory compliance, optimise their tax positions, and provide management with a significantly clearer picture of long-term profitability and liquidity.
