Selling a commercial property with claimed capital allowances triggers a pool-level disposal mechanic that most general guidance skips over. The Capital Allowances Act 2001 does not compute disposal asset by asset: it compares the pool's running balance of available qualifying expenditure against the running balance of disposal receipts, and produces either a balancing allowance (additional relief) or a balancing charge (taxable receipt clawing back prior allowances). Whether the disposal triggers an immediate event depends on which pool the asset sits in and whether the disposal closes the qualifying activity. The fixtures regime in CAA 2001 ss.196 to 199 layers a separate buyer-and-seller election machinery on top.
This page walks the disposal mechanic from first principles, lays out the eight disposal events under s.61, sets out three worked scenarios (a clean s.198 election at written-down value, a no-election commercial sale generating a balancing charge, and an MVL distribution-in-specie crystallising a final-period balancing charge), and contrasts the Part 2 plant-and-machinery treatment with the Part 2A SBA treatment, which has no balancing event on disposal and recoups instead through TCGA 1992 s.37B on the CGT side.
The pool concept: AQE and TDR
CAA 2001 s.55 (Determination of entitlement or liability) sets the master computation. For each pool of qualifying expenditure, entitlement to a writing-down allowance or balancing allowance, or liability to a balancing charge, is determined by comparing two running balances. Available qualifying expenditure (AQE) is the unrelieved cost base in the pool: the cumulative qualifying expenditure brought into the pool less the cumulative writing-down allowances given against it. Total disposal receipts (TDR) is the cumulative disposal value brought into the pool from disposal events on assets that have left it.
Where AQE exceeds TDR (the typical position for a live pool), the taxpayer is entitled to a writing-down allowance in the current chargeable period (at 18 per cent reducing balance for the main pool or 6 per cent reducing balance for the special-rate pool), or to a balancing allowance if the period is the final chargeable period for the pool. Where TDR exceeds AQE, the taxpayer is liable to a balancing charge equal to the excess, treated as a taxable receipt of the qualifying activity.
For a portfolio pool (main pool or special-rate pool serving an ongoing property business), individual asset disposals reduce AQE-less-TDR by the disposal value but do not by themselves crystallise a balancing event. The pool persists with the remaining plant and the ongoing writing-down continues. The balancing event arises in the final chargeable period for the pool, which under CAA 2001 s.65 is the chargeable period in which the qualifying activity permanently ceases. For a single-asset pool (short-life asset election under s.83; high-emission car), the disposal does empty the pool and a balancing event crystallises at that point.
The eight disposal events under CAA 2001 s.61
CAA 2001 s.61 (Disposal events and disposal values) sets out the events that trigger a disposal value and the disposal values that arise from each. The eight categories are: (1) sale at not less than market value, with disposal value equal to net sale proceeds plus any insurance and compensation; (2) sale below market value in a connected-party or non-arm's-length context, with disposal value substituted to open market value; (3) demolition or destruction, with disposal value equal to net scrap or salvage proceeds plus compensation; (4) permanent loss otherwise than by destruction, with disposal value equal to insurance and compensation; (5) abandonment of plant used for mineral exploration, with disposal value equal to insurance and compensation; (6) entry into a long funding finance lease, with disposal value equal to the greater of market value at lease commencement or qualifying lease payments; (7) entry into a long funding operating lease, with disposal value equal to market value at lease commencement; (8) other events, including ceasing to use the plant in the qualifying activity, the qualifying activity itself coming to an end, and any event not within (1) to (7), with disposal value equal to open market value at the time of the event.
Event 8 is the catch-all that captures distributions-in-specie, gifts to non-connected parties at undervalue, and the moment plant stops being used in any qualifying activity. The market-value substitution at event 8 is the operationally important one for MVL exits and family-member transfers.
The fixtures Table at s.196 and the s.198 election layer
For fixtures sold with a commercial building (integral features, lifts, electrical and water systems, kitchens, removable plant attached but not part of the shell), the disposal-value computation runs through CAA 2001 s.196 (Disposal values: special rules for fixtures) rather than the general s.61 framework. s.196 contains a 12-item Table mapping each fixtures disposal scenario to the seller's disposal value. The most common entry (item 1, sale at not less than market value) gives the seller's disposal value as the part of the sale proceeds attributable to the fixtures.
The apportionment of the property sale price between fixtures and the rest of the consideration is the negotiated question. Without a s.198 election, the apportionment defaults to a just-and-reasonable basis, typically derived from a quantity-surveyor exercise. The buyer faces an asymmetric problem: under the FA 2012 Schedule 10 pooling-and-fixed-value gates, the buyer cannot claim allowances on the fixtures unless the seller has pooled the relevant expenditure AND a s.198 election (or s.199 tribunal determination) has been made within two years of completion. Where the buyer wants the claim and the seller has not pooled or will not elect, the buyer loses the fixtures claim permanently.
The s.198 election is a joint election by buyer and seller fixing the amount the buyer treats as its qualifying expenditure on the fixtures (and, by symmetry, the amount the seller treats as its disposal value). The elected amount must not exceed the lower of (a) the seller's original capital expenditure on the fixture, and (b) the actual sale price. Within those caps, the buyer and seller have wide negotiating freedom. The mechanics of the election from the buyer's perspective are covered in detail in bucket sibling page C6 (commercial-property fixtures, s.198 election and the 2-year pooling gate); C2 here covers the seller-side disposal-value consequence.
Worked scenario 1: clean s.198 election at written-down value
Consider an anonymised property SPV selling a freehold office unit for £1,200,000. The unit was acquired three years ago for £950,000; the SPV identified and pooled £165,000 of fixtures expenditure on acquisition, allocating £85,000 to the special-rate pool (integral features: electrical, heating, ventilation, lighting) and £80,000 to the main pool (removable kitchen equipment, security system, fire alarm). Three years of writing-down at 18 per cent main-pool and 6 per cent special-rate pool have reduced the unrelieved balances to £44,200 main and £75,300 special-rate (the rough written-down values after three years' reducing-balance WDA, ignoring the AIA / FYA acceleration on the original acquisition for simplicity).
At sale, the buyer and seller negotiate a s.198 election fixing the disposal value on the fixtures at £119,500 (the sum of the two pool written-down values: £44,200 main + £75,300 special-rate). The election is signed within four months of completion. The seller brings disposal values of £44,200 to the main pool and £75,300 to the special-rate pool: each disposal value exactly equals the pool's residual balance attributable to those fixtures, so the pool position is balanced and no balancing charge arises. The buyer takes a fresh £119,500 of qualifying expenditure into its own pool, splitting £44,200 main / £75,300 special-rate, and writes down from period one of buyer ownership. Both sides defend on inspection; the s.198 election is the protective mechanism on both sides of the transaction.
Worked scenario 2: no election + over-apportionment generates a £62,000 balancing charge
Take the same SPV and the same property sale, but this time no s.198 election is made. The conveyancer's purchase contract apportions the £1,200,000 consideration as £950,000 to the freehold-shell, £150,000 to the fixtures, and £100,000 to goodwill (which is not capital-allowances-relevant for the property tax computation but does appear on the contract). The HMRC just-and-reasonable apportionment for the s.196 Table item 1 calculation accepts the £150,000 contract figure as a reasonable starting point.
The seller's disposal-value computation now brings £150,000 to the pools, on a just-and-reasonable basis split (using the historic 85/80 allocation) as £77,000 special-rate and £73,000 main pool. Compared against the residual pool balances of £75,300 special-rate and £44,200 main, the special-rate pool sees a balancing charge of £77,000 less £75,300 equals £1,700; the main pool sees a balancing charge of £73,000 less £44,200 equals £28,800. Plus, because the buyer cannot claim without the s.198 election (the pooling gate is met, but the election gate is not), the buyer has no claim on the fixtures going forward and the seller has unintentionally given away £119,500 of buyer-side allowances. Total bad outcome for the seller: a £30,500 balancing charge (taxable at the corporation tax rate, so £7,625 of additional tax at 25 per cent CT) plus a buyer who is unhappy about a £119,500 missed allowances claim that pulls perceptibly on the purchase-price negotiation if discovered late.
The remediation is straightforward in the contract phase: make the s.198 election. Once the two-year window closes, the remediation is impossible.
Worked scenario 3: MVL distribution-in-specie of a property SPV asset
Consider a property SPV holding a single commercial unit on the verge of members' voluntary liquidation. The unit's residual pool balances are £44,200 main + £75,300 special-rate (as in scenario 1). The directors plan to distribute the property in specie to themselves as the sole shareholders, in lieu of a cash distribution. The MVL distribution-in-specie is a CAA 2001 s.61 event 8 disposal: ceasing to use the plant in any qualifying activity (because the company is going into liquidation and the qualifying activity is permanently ceasing). The disposal value is the open market value of the plant at the time of the event.
Take a market value at distribution of £150,000 attributable to the fixtures (the same value the no-election scenario 2 apportionment produced). The disposal value brought to the pools is £150,000 (split £77,000 / £73,000 on the historic allocation basis). The pool balancing computation in the company's final accounting period: special-rate £77,000 disposal value less £75,300 AQE equals £1,700 balancing charge; main pool £73,000 disposal value less £44,200 AQE equals £28,800 balancing charge. Total £30,500 balancing charge crystallising in the company's final corporation tax computation.
The MVL itself triggers a separate set of computations on the shareholders' side: the distribution of assets in winding up is treated as a CGT distribution under CTA 2010 s.1030A (the corporate-distribution-in-winding-up exemption from income treatment, subject to the FA 2016 anti-avoidance TAAR at ITTOIA 2005 s.396B for connected-party post-winding-up trading). The interaction of the CA balancing charge in the company's final period with the shareholder-side CGT-vs-income classification is the load-bearing pre-MVL analysis. The mechanics of the MVL distribution route on the shareholder side are walked in our companion page MVL of a property company: CGT vs income on the final distribution, with the s.396B TAAR risk-mapping included.
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The SBA contrast: no balancing event, s.37B TCGA add-back instead
Structures and Buildings Allowance, in CAA 2001 Part 2A, behaves differently on disposal. There is no balancing event under Part 2A: the allowance period (33 and a third years from first non-residential use for general qualifying expenditure, or 10 years for special tax site qualifying expenditure) inherits to the successor owner without interruption. The seller does not bring a disposal value into any SBA pool; the buyer continues writing down on the same basis from the same starting point in their own accounting periods.
The disposal mechanic for SBA sits entirely on the CGT side via TCGA 1992 s.37B. The provision requires that, when a building or structure to which SBA has applied is disposed of, the cumulative SBA claimed by the seller (and by any prior SBA-claiming owner the seller acquired from, where the seller stepped into the prior owner's allowance period) is added to the disposal consideration for chargeable gains purposes. The CGT base cost is unchanged; the deemed consideration is the actual consideration plus the cumulative SBA. The cumulative SBA effectively recoups against the seller's CGT computation at the seller's CGT rate.
The non-residential CGT rates from 30 October 2024 are 18 per cent (basic rate) and 24 per cent (higher rate) for individuals on chargeable gains on non-residential assets, and the standard corporation tax rate (currently 25 per cent main rate or 19 per cent small-profits rate) for companies. For a company holding a commercial property for the full 33 and a third year period and claiming 100 per cent of the original SBA, the cumulative recoupment via s.37B converts to corporation tax at 25 per cent on disposal: SBA delivers value to the extent that the CT deduction year on year (at the marginal CT rate then-applicable) exceeds the eventual recoupment rate. The timing-shift framing is essential: SBA is a deferral, not a permanent relief.
Anyone framing SBA as carrying a balancing allowance or charge on disposal is conflating Part 2A with Part 2 of CAA 2001. The legacy CA guidance pool is full of this conflation; bucket sibling page C3 is the SBA depth page, covering the allowance statement requirement at s.270IA and the no-balancing-event-plus-s.37B-add-back framing in worked-example detail.
Final-period mechanics under s.65
CAA 2001 s.65 (The final chargeable period and the postponement of allowances) defines when the balancing event arises for a pool. For the main pool and special-rate pool, the final chargeable period is the chargeable period in which the qualifying activity permanently ceases. Closing the property business, dissolution of the company, sale of the last commercial asset out of the pool with no continuing activity: each is a permanent-cessation trigger.
In the final chargeable period, the writing-down allowance route is replaced. The taxpayer compares AQE against TDR in that final period: AQE > TDR yields a balancing allowance, an additional deduction in the final period to the extent of the excess. TDR > AQE yields a balancing charge, a taxable receipt to the extent of the excess. For a property company winding down its commercial portfolio, the final-period mechanics interact with corporation-tax loss-relief: a final-period balancing allowance can produce a final-period loss that may carry back three years (under the extended carry-back rules where applicable) or surrender as group relief if a corporate group is in play.
The single-asset pool case differs. Short-life assets (s.83 election), high-emission cars, and certain other single-asset pools crystallise a balancing event on the asset's disposal regardless of whether the qualifying activity continues. The 8-year cut-off on short-life-asset elections means that a short-life asset still held at the cut-off rolls into the main pool, and the SHL-election balancing-allowance acceleration is lost.
Super-deduction historic clawback in summary
Assets on which the FA 2021 ss.9-10 130 per cent first-year allowance was claimed (during the operative window of 1 April 2021 to 31 March 2023) carry a special disposal-value uplift under FA 2021 Schedule 10. Where the super-deducted asset is disposed of in a chargeable period straddling 1 April 2023, the disposal value brought to the pool is multiplied by 1.3; the 50 per cent special-rate FYA companion carries a 0.5 uplift. For chargeable periods beginning on or after 1 April 2023, the uplift factor scales down according to a formula linked to the proportion of the chargeable period of disposal that falls within the operative window.
The clawback bites in addition to the ordinary s.61 disposal-value taxonomy. Where the super-deducted asset is sold for market value of £100,000 in a straddling period, the disposal value brought to the pool is £130,000 (1.3 uplift), generating a balancing charge of £130,000 less the unrelieved pool balance for that asset. For a fully written-down asset (which is the dominant case given super-deduction delivered 130 per cent at acquisition), the entire £130,000 is balancing charge in the period of disposal. Bucket sibling page C10 walks the historic super-deduction clawback in full, including the chargeable-period straddle factor scaling.
Practical mistakes to avoid
The disposal-side mechanic produces a cluster of recurring errors in practice. Recognising them is the cheapest way to defend a position.
Missing the s.198 election. The two-year clock from completion is hard. Conveyancers without a tax brief skip the election regularly. Buyers lose the fixtures claim permanently; sellers may end up with a balancing charge on a higher-than-pool apportioned disposal value. Adding the election to the heads-of-terms package costs nothing and defends both sides.
Treating the SBA disposal as a balancing event. SBA has no balancing event. The s.37B add-back is the disposal mechanism, on the CGT side. Pre-Wave-6 guidance regularly framed SBA disposal as carrying a CA balancing allowance or charge; this is wrong and propagates through inherited advice.
Connected-party gift at undervalue. CAA 2001 s.61 table item 2 substitutes open market value where the disposal is at undervalue in a connected-party context. Gifting plant or fixtures to a connected family company or family member at a token price does not avoid the disposal value; the market-value substitution claws back the prior allowances at full market value regardless.
MVL distribution-in-specie without modelling the balancing charge. Event 8 of s.61 catches the in-specie distribution. The market-value disposal value crystallises a balancing charge in the company's final corporation tax period, often unexpected by directors planning a clean MVL exit. The shareholder-side CGT-vs-income classification is a separate question and does not relieve the company-level CA charge.
Crystallising a "phantom" balancing allowance mid-life. The portfolio pool persists while the qualifying activity continues. There is no mid-life balancing allowance on a portfolio pool simply because one asset has stopped earning. Short-life asset elections under s.83 are the targeted route to accelerate balancing allowance recognition, made on a per-asset basis at acquisition.
Forgetting the super-deduction clawback factor. Assets in the 1 April 2021 to 31 March 2023 super-deduction window carry a 1.3x (or 0.5x for special-rate FYA assets) disposal-value uplift. The clawback continues to bite on disposals in later chargeable periods, scaled by the straddle factor. Bucket sibling page C10 walks the mechanics; the takeaway is that the super-deduction was never "free" 130 per cent relief; it was 130 per cent at acquisition, 130 per cent of disposal value back at disposal.
Sources and statutory references
- Capital Allowances Act 2001, section 55 (Determination of entitlement or liability; AQE vs TDR comparison).
- Capital Allowances Act 2001, section 61 (Disposal events and disposal values; eight-event taxonomy).
- Capital Allowances Act 2001, section 65 (The final chargeable period and the postponement of allowances).
- Capital Allowances Act 2001, section 83 (Short-life asset election).
- Capital Allowances Act 2001, section 196 (Disposal values: fixtures Table); section 198 (Fixtures: election to apportion sale price); section 199 (Fixtures: tribunal determinations); section 201 (Fixtures: two-year time limit for election).
- TCGA 1992, section 37B (SBA cumulative add-back to disposal consideration).
- Finance Act 2012, Schedule 10 (fixtures pooling-and-fixed-value requirements).
- Finance Act 2021, Schedule 10 (super-deduction disposal-value clawback uplift).
- HMRC Capital Allowances Manual, CA28000 (disposal values), CA28500 (s.198 election), CA29000 (balancing adjustments).
Related reading on this site: bucket sibling pages C1 pillar (the four-axis decision framework); A4 (MVL: CGT vs income on final distribution); C3 (SBA depth; allowance statement and the s.37B contrast); C5 (full expensing carve-outs and intra-group transfer); C6 (commercial fixtures and s.198 election from the buyer's perspective); C10 (super-deduction historic clawback in full). Adjacent existing pages: Capital Allowances on Property: residential vs commercial overview; CGT on Commercial Property: how it differs from residential (note: that page may need a refresh on the 30 October 2024 non-residential CGT rate uplift to 18% / 24%).