Goodwill Impairment Testing: A UK Guide for SMEs

Action Accountants •16 June 2026

You've bought a business, the deal has completed, and your first draft balance sheet lands in your inbox with a line you didn't have before: goodwill. It may be one of the largest assets on the page, yet it's also the hardest one to “see”. There's no van, no machine, no building attached to it. Just a number.

That's where many owners pause. They understand what they paid for in commercial terms: reputation, contracts, know-how, key staff, recurring customers, local standing. What's less obvious is why that number can't remain in the accounts untouched. If your company reports under FRS 102, goodwill impairment testing is the mechanism that proves that asset still deserves to be there.

For UK SMEs and construction contractors, this isn't just technical compliance. A failed test can hit profit sharply, alter conversations with lenders, and change how buyers, investors, or shareholders read the accounts. Done properly, it also gives you a much clearer view of whether an acquisition is performing the way you expected.

What Is Goodwill and Why Must You Test It

A common real-world scenario looks like this. A plumbing contractor buys a smaller rival because the target has framework relationships, experienced site supervisors, and a reputation that opens doors with main contractors. The buyer doesn't just pay for vans, stock, and debtors. They also pay a premium for earning power that isn't separately listed on an asset register. That premium becomes goodwill.

What goodwill really represents

Goodwill is the accounting label for the value of things that make a business commercially attractive but aren't easily separated into standalone assets. Think customer loyalty, a trained workforce, a respected brand in a local market, or the benefit of a team that already knows how to deliver profitable work together.

For a business owner, the simplest analogy is this: if net assets are the bricks, goodwill is the reason someone paid more than the bricks alone were worth.

That matters because goodwill can remain on the balance sheet for a long time. Under modern UK reporting, that balance isn't there by default. Management has to justify it.

Practical rule: If goodwill is still in the accounts, someone should be able to explain why the acquired business or service line still supports that value.

Why the test matters to profit

Under UK reporting practice, goodwill isn't treated like a routine running cost that you spread away year after year. It has to stand up to an impairment review. If the value supported by future cash generation has weakened, the business records an impairment loss through profit and loss.

That's why goodwill impairment testing often surprises owners. Cash in the bank may feel steady. Sales may even look flat rather than disastrous. But if expected margins, risk, or recoverable value have moved against you, the accounts may still require a charge.

In practical terms, this is an annual health check on the story behind the acquisition. Did the customer relationships hold? Did the work pipeline materialise? Did the team stay? Did higher borrowing costs change the economics? Those are business questions first, accounting questions second.

Understanding UK Goodwill Impairment Rules

For most UK SMEs, the starting point is FRS 102 Section 27. The rule is straightforward in concept even if the judgement can be demanding in practice. Under UK GAAP, goodwill is generally not amortised; instead, it is tested for impairment under FRS 102 Section 27, using a recoverable amount test, and FRS 102 has been the core standard for most non-listed entities since 2015 according to this UK goodwill impairment summary.

How the UK rulebook works

The test usually happens at the level of a cash-generating unit, often shortened to CGU. That means the smallest identifiable part of the business that generates cash inflows independently enough to assess.

A CGU isn't always the whole company. In an SME, it might be:

• A separate acquired division that has its own customers and management reporting
• A service line such as maintenance, fit-out, or specialist subcontract work
• A branch or region if that part of the business is run and monitored distinctly

The easiest way to think about a CGU is as a rental property within a larger portfolio. You don't test whether the entire portfolio feels healthy if one building is underperforming. You assess the unit that generates its own return.

For some owners, confusion arises between legal structure and reporting structure. A company can be one legal entity but still contain more than one CGU. If you're reviewing whether to trade through a company or personally, the legal wrapper is a separate issue from impairment mechanics, and this guide on limited company vs sole trader helps frame that distinction.

Recoverable amount is the core test

The heart of goodwill impairment testing is comparing two figures:

Item	What it means
Carrying amount	The book value of the CGU, including allocated goodwill
Recoverable amount	The higher of value in use and fair value less costs to sell

If the carrying amount is higher, there's an impairment.

This shift away from older “write it down over time” thinking has made management judgement much more important. Since goodwill isn't being reduced automatically each year, directors need support for the assumptions used to defend the balance. That includes forecasts, commercial rationale, and evidence that the CGU still performs broadly in line with what was expected when the business was bought.

What works well is discipline: clear allocation of goodwill, clean management accounts by business line, and forecasts that tie back to real trading. What doesn't work is a vague sense that “the business is still worth it”.

Identifying Goodwill Impairment Triggers

Annual testing is only part of the picture. Problems usually arise because management waits until year-end when the trigger for a review appeared much earlier.

In UK practice, goodwill must be tested at least annually and earlier when indicators of impairment arise, with trigger-based testing being especially important in cyclical sectors such as construction, property, and SME advisory businesses. This can force an interim test before year-end accounts are finalised, as noted in this summary of trigger-based goodwill reviews.

The warning signs owners usually see first

Most impairment triggers show up in ordinary management information before they reach the statutory accounts. Owners often spot them, but don't always recognise them as accounting triggers.

Watch for signs like these:

• Profitability dropping below acquisition expectations. Not one disappointing month, but a pattern showing the acquired business isn't earning what justified the original purchase price.
• Loss of a key customer or framework. If one client carried a large part of the acquired earnings case, that loss can change value quickly.
• Departure of critical people. Goodwill often depends on leadership, technical know-how, or customer relationships staying in place.
• Restructuring decisions. Closing a site, folding a team into another operation, or changing the delivery model may indicate the original asset base no longer supports the old carrying value.
• Refinancing pressure or rising finance costs. These can affect forecasts and the assumptions used in value calculations.

Keep a simple trigger log. If actual trading starts to diverge from the assumptions used in the last valuation, record it while it happens rather than trying to reconstruct the story months later.

A lot of wider business issues that erode value begin as routine finance slippage. These quiet financial traps for small business owners are often the same conditions that later lead to impairment work.

Why construction firms need faster trigger reviews

Construction contractors have a harder version of this problem because earnings can change rapidly without the headline turnover moving much. A company may still be busy but less profitable because of rework, delays, higher subcontractor costs, or weaker pricing on new tenders.

A few sector-specific triggers deserve close attention:

• Contract pipeline deterioration after a strong acquisition case was built around expected repeat work
• Customer concentration risk where one developer, main contractor, or housing association matters heavily
• Higher borrowing or bonding pressure affecting the economics of future work
• Post-year-end trading weakness that appears before the accounts are signed

For contractors, waiting for the audit file or year-end pack is often too late. By then, operational evidence may already point to a value decline that needs to be reflected.

How to Perform a Goodwill Impairment Test

The mechanics are easier once you stop treating the exercise as an abstract valuation project. For most SMEs, it's a structured comparison between what the relevant business unit is worth today and what the accounts say it's worth.

A simple process map helps:

Step one to step three

Step 1 is identifying the CGU. This is the unit being tested. For an acquired contractor, that may be the electrical division you bought, not the whole group. For a professional services firm, it may be the acquired client portfolio and team.

Step 2 is calculating the carrying amount.
Add up the book value of assets and liabilities allocated to that CGU, including the goodwill balance. This needs care. If management reporting doesn't split the acquired business properly, the test becomes unreliable quickly.

Step 3 is estimating recoverable amount.
This is the higher of:

• Value in use, which is based on the future cash the CGU is expected to generate
• Fair value less costs to sell, which is closer to what a buyer might pay after selling costs

The property analogy works well here. If you owned a commercial unit, you'd ask two different questions. What could I sell it for today after costs? And what is it worth to me if I keep renting it out? Recoverable amount is whichever answer is higher.

For most owner-managed businesses, value in use is the route used most often because there may not be a clean market sale comparator for a small specialist unit.

This short explainer is useful if you want a visual overview before building the model:

Step four and step five

Step 4 is pressure-testing assumptions. Many models fail at this stage. The test is highly sensitive to discount rate, terminal growth rate, and medium-term cash-flow forecasts. In practice, a 1 percentage point increase in the discount rate can reduce value in use enough to trigger impairment because goodwill is the residual balance absorbed first, as explained in this technical discussion of goodwill testing sensitivity.

What works:

• Forecasts tied to signed work, order books, and actual margin trends
• Documented assumptions for inflation, wage pressure, and financing environment
• Sensitivity checks on downside scenarios

What doesn't work:

• Budget optimism with no operational support
• Using last year's model unchanged
• A discount rate chosen because it “feels reasonable”

The fastest way to lose credibility with auditors is to present a model that management can't explain in plain English.

Step 5 is recording any impairment.
If carrying amount exceeds recoverable amount, you recognise an impairment loss and reduce goodwill accordingly. The accounting entry is simple. The judgement behind it rarely is.

If the process feels heavy, that's because it often crosses bookkeeping, forecasting, tax awareness, and valuation judgement. This practical note on how an accountant helps a small business is a good reminder that the value usually lies in joining those pieces up, not in producing a spreadsheet for its own sake.

Worked Examples for SMEs and Contractors

The examples below are simplified so the mechanics are easy to follow. They are illustrations, not prescribed benchmarks. In live work, the judgement usually sits in CGU definition, cash-flow support, and whether management has enough evidence to defend assumptions.

Example one acquired SME service business

A London-based SME acquires a smaller advisory firm. The acquired team and client book are run as a distinct unit, so management treats that as the CGU.

The carrying amount at review date is:

Component	Amount
Tangible and other identifiable net assets	£240,000
Goodwill	£160,000
Total carrying amount	£400,000

Management prepares a value in use model from expected future cash flows and concludes recoverable amount is £360,000.

The comparison is direct:

• Carrying amount = £400,000
• Recoverable amount = £360,000
• Impairment required = £40,000

Because goodwill is the residual balance, the impairment is recorded against goodwill first.

Journal entry

Debit	Credit
Impairment loss £40,000	Goodwill £40,000

After the entry, goodwill falls from £160,000 to £120,000.

The commercial interpretation matters as much as the journal. This doesn't automatically mean the acquisition failed. It may mean client retention was slower than expected, fee rates came under pressure, or the risk profile has changed enough that the original goodwill balance can't be fully supported.

Example two construction contractor buying a specialist team

A building contractor acquires a specialist plumbing subcontractor to strengthen its mechanical offering. The acquired operation is tracked as its own service line because it has a distinct client base, workforce, and tender pipeline.

The carrying amount is:

Component	Amount
Plant, equipment, working capital, and other net assets	£500,000
Goodwill	£250,000
Total carrying amount	£750,000

Management reviews current trading. Turnover is steady, but margins have softened and forecast cash generation is weaker than originally expected. A recoverable amount assessment supports £680,000.

That gives:

• Carrying amount = £750,000
• Recoverable amount = £680,000
• Impairment required = £70,000

Journal entry

Debit	Credit
Impairment loss £70,000	Goodwill £70,000

Goodwill after impairment becomes £180,000.

This is the sort of pattern seen in contracting businesses. Revenue can hold up while value weakens because future profit on the pipeline is less attractive. A goodwill review picks that up sooner than a casual glance at top-line sales.

A contractor with a full order book can still need an impairment if forecast margins, risk, or financing assumptions no longer support the carrying value.

If you operate in construction, the quality of your internal reporting often decides whether the exercise is manageable or painful. Separate job profitability, divisional overhead allocation, and realistic pipeline assumptions all matter. That's particularly relevant for owner-managed firms using specialist support such as a contractor accountant in London, where CIS, subcontractor costs, and project timing can complicate the forecast.

Your Financial Statement Disclosure Checklist

Finishing the valuation isn't the end of the job. The accounts also need to explain what happened clearly enough for shareholders, lenders, and auditors to follow the judgement.

What needs to appear in the notes

Use a working paper checklist before the accounts are finalised.

Disclosure Item	What to Include
CGU identified	State which business, division, branch, or service line was tested
Amount of impairment loss	Show the charge recognised in profit and loss
Events and circumstances	Explain what led to the impairment review or charge, such as weaker trading, restructuring, or loss of major work
Method used	Say whether recoverable amount was based on value in use, fair value less costs to sell, or both
Key assumptions	Summarise the assumptions that drove the conclusion, such as discount rate, cash-flow forecasts, and growth assumptions
Sensitivity areas	Highlight the assumptions most likely to change the outcome
Remaining goodwill balance	Show the goodwill figure after the impairment entry

A concise note usually works better than a dense one. Readers want to know what was tested, what changed, and how management reached the conclusion.

For SMEs producing management packs from spreadsheet-based forecasts, presentation quality matters more than many directors expect. A clear process for turning forecast tabs into board-ready summaries can save time, and SheetMergy's Excel reporting guide is a useful operational reference if your impairment support starts life in Excel.

Frequently Asked Questions from Business Owners

Common judgement calls

Can I reverse a goodwill impairment later if trading improves?
As a practical rule, treat a goodwill impairment as permanent. If performance recovers later, that doesn't mean you write the old balance back up and undo the charge.

My CGU is loss-making, but I still think it has value. Does that mean impairment is automatic?
No. A temporary loss doesn't decide the answer on its own. The issue is whether recoverable amount still supports the carrying amount. Some units remain valuable because of future cash potential, strategic fit, customer relationships, or expected recovery. The point is that you must evidence that case.

How do I choose a discount rate if I'm not paying for a formal valuation?
Start with discipline, not guesswork. The rate should reflect the risk profile of the CGU and be consistent with the assumptions in the rest of the model. If management can't explain why the rate fits the business, it probably needs more work. For smaller firms, a defensible internally prepared model is often better than an expensive external report built on weak forecasting.

Does an impairment mean the business is in trouble?
Not necessarily. Sometimes it signals serious underperformance. Sometimes it reflects a sensible reset after an optimistic acquisition model met tougher trading conditions. It's an accounting acknowledgement that expected value has changed. It isn't always a sign of operational distress.

What's the most common mistake owners make?
They test too late and document too little. By the time year-end arrives, memories are vague, forecasts have changed, and evidence is harder to assemble. A live trigger log and regular review of acquired business performance solves much of that.

What if the acquired business has now been absorbed into the wider company?
That's common. But it doesn't remove the need for a defensible CGU assessment. You still need to identify where the acquired goodwill now sits and which cash flows support it.

Do small businesses really need this level of detail? Yes, if goodwill is material. Simpler businesses can often do the work in a more efficient manner, but they still need a rational method, support for assumptions, and proper disclosure.

If you'd like practical help with goodwill impairment testing, statutory accounts, construction-focused reporting, or broader SME finance support, Action Accountants Limited advises growing businesses and contractors across London and the UK with a clear, hands-on approach that keeps complex issues understandable.