Construction is one of the few sectors where the standard "recognise revenue when invoiced" rule of thumb does not apply. Under FRS 102 (the UK GAAP standard most non-listed UK construction companies report under), revenue from a construction contract is recognised by reference to the stage of completion of the contract activity at the reporting date, not when invoices are issued or cash collected. The mechanics are codified in Section 23 of FRS 102 and the practical application is where most material audit adjustments arise on construction company accounts.
This guide covers the full picture. The percentage-of-completion method that drives most contract accounting. Onerous contract treatment when expected costs exceed expected revenue. The year-end reconciliation between work-in-progress, applications, certifications, and retentions. The accrual versus cash question for multi-year developments. The balance-sheet treatment of retention moneys withheld. Pre-contract and tender costs. And the recognition of variations, claims, and incentive payments where the contractual position is uncertain. Each section links to a detailed companion piece.
Section 23 applies even where construction is not your primary trade
A property developer building units for sale, a fit-out specialist working under JCT contracts, an M&E firm under NEC4 conditions, and a specialist subcontractor under a domestic subcontract all sit within Section 23 if the contract is long-term and the activity is construction. The trade label does not determine the accounting treatment; the contract structure does.
Why construction revenue recognition is different
Most businesses recognise revenue at the point of sale. A retailer recognises revenue when goods change hands. A SaaS company recognises subscription revenue ratably over the contract period. Construction does not fit either pattern cleanly. Contracts run for months or years, costs accumulate before any cash is collected, valuations are approximate, payment is structured around interim certificates and retentions, and the final outturn is often only known months after physical completion. Recognising revenue only at handover would distort the financial position throughout the contract life.
Section 23 of FRS 102 addresses this by requiring revenue to be recognised in proportion to the work done at each reporting date. The mechanism is the percentage-of-completion (POC) method: at year-end, you measure how complete the contract is and recognise that proportion of the total expected revenue, alongside the matching proportion of total expected costs. The result is an income statement that tracks the economic activity of the period, not just the cash that happened to flow.
The percentage-of-completion method in practice
POC requires three figures at each reporting date: total expected contract revenue, total expected contract costs, and the proportion of total costs incurred to date. The standard formula:
- 1Stage of completion = costs incurred to date divided by total expected costs.
- 2Revenue recognised = stage of completion multiplied by total expected revenue.
- 3Profit recognised = revenue recognised less costs incurred to date (where total contract is expected to be profitable).
Example: a £2m contract expected to cost £1.5m, with £450,000 of costs incurred at year-end. Stage of completion is 30%. Revenue recognised is £600,000. Costs are £450,000. Profit recognised in the period is £150,000 (the proportionate share of total expected profit of £500,000).
The POC measurement is only as good as the cost forecast. A poorly-maintained cost-to-complete estimate produces a misstatement in either direction. This is why auditors focus heavily on the cost forecast methodology in construction-company audits and why principal contractors run formal monthly cost-value-reconciliation (CVR) processes to keep the figures defensible.
Output methods and surveyor valuations
Section 23 also permits "output" measures of completion (surveys of work performed, physical proportion of the contract) where they more reliably reflect progress than the cost-input method. Civil engineering and infrastructure contracts often use independent surveyor valuations. The choice of method should be applied consistently within and across contracts of similar character.
When to recognise losses
Section 23 introduces an important asymmetry: where a contract is expected to be profitable, profit is recognised proportionately as work progresses. Where a contract is expected to be loss-making (an onerous contract), the entire expected loss is recognised immediately, regardless of the stage of completion. The principle is conservatism: book bad news as soon as you can foresee it.
Practically, this means a construction company's monthly CVR process needs to flag contracts where total expected costs exceed total expected revenue. Once flagged, the full expected loss hits the income statement in that period. This is uncomfortable to book and is therefore one of the most commonly understated provisions in construction company accounts. Auditors look for it.
Retention moneys: where they sit on the balance sheet
Most construction contracts include a retention provision: typically 3% to 5% of each interim payment is withheld by the employer until practical completion (when half is released) and end of defects liability period (when the balance is released). The accounting treatment of retentions is a recurring source of confusion.
The principle: retention moneys are revenue earned but not yet payable. They should be:
- Included in revenue at the point the work is done (not at the point of release).
- Held as a debtor (trade receivable) on the balance sheet until released.
- Categorised as long-term where the release date is more than 12 months out.
- Subject to the same impairment review as ordinary receivables, with provision for any retention where collection is doubtful.
Variations, claims, and the cost-vs-revenue question
Construction contracts are rarely fixed at signing. Variations (formal change orders), claims (disputed entitlements), and incentive payments are routine. The question for revenue recognition is when to bring them into the accounts.
Section 23 distinguishes:
- 1Variations agreed and instructed: include in contract revenue at the agreed value.
- 2Claims and incentive payments: include only when negotiations have reached a stage where it is probable the customer will accept and the amount can be measured reliably.
- 3Pure expectations of future variations: do not include until they meet the recognition criteria.
In practice, the "probable and reliably measurable" test for claims is judgemental. Construction company audits often turn on whether claim revenue should have been recognised in the period or deferred. Maintaining contemporaneous correspondence with the employer on each claim, dated and signed, is the documentation that defends the recognition position.
Pre-contract and tender costs
Costs incurred before a contract is awarded are generally expensed as incurred. Once the contract is reasonably certain to be awarded (LOI signed, formal preferred bidder status, or similar), pre-contract costs incurred specifically for that contract can be capitalised and recognised against contract revenue when work begins. The bar for "reasonably certain" is high; auditors push back on aggressive capitalisation.
A defensible pattern: tender costs for jobs that are speculative (early-stage bids) go through the income statement as expenses; tender costs incurred after preferred-bidder status is achieved sit on the balance sheet pending award; once award occurs, they are recognised proportionately with contract revenue.
Common questions about construction revenue recognition
Does FRS 102 apply if we file under FRS 105 (micro-entities)?
No. FRS 105 is a simplified standard for micro-entities (turnover under £632,000 and other size criteria). It uses simpler revenue recognition rules and does not include Section 23. Most construction companies of any meaningful size are too large for FRS 105 and report under FRS 102 or FRS 102 Section 1A (the small-entity regime).
How does FRS 102 differ from IFRS 15?
IFRS 15 (the listed-company revenue standard) uses a five-step model focused on performance obligations rather than the percentage-of-completion approach. Most construction contracts under IFRS 15 still recognise revenue over time using output or input measures, so the practical result is similar, but the conceptual framing is different. Listed UK construction companies report under IFRS; most private companies remain on FRS 102.
How do auditors test the cost forecast?
Audit testing typically covers: comparing the current cost forecast to prior forecasts and explaining the movement, agreeing labour and materials cost rates to source data, testing significant accruals back to supporting evidence, and reviewing the CVR meeting minutes to assess management judgement. Companies with weak forecast disciplines tend to face material audit adjustments at year-end.
What if we have not been applying Section 23 historically?
Restate prior year figures under FRS 102 Section 10 (Accounting Policies, Estimates and Errors) and disclose the change. Material historical errors require restatement of comparatives. Engage a specialist construction accountant before the next audit cycle; the cost of getting Section 23 right is dwarfed by the cost of an unqualified-to-qualified opinion on the next set of accounts.
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