Selling Your STL: The Pre-Sale Accounting Work That Adds to the Price and Reduces the CGT Hit

In short: BADR has never applied automatically to a sale of a holiday-let property — even pre-6 April 2025, it required the disposal to satisfy the qualifying-business-disposal conditions (typically a disposal of the business as a going concern, or of business assets on cessation, not merely a sale of an individual property). What FHL status gave was a route for those conditions to be met more readily than for a standard investment property. After the FHL abolition, most STL disposals fall outside BADR entirely and face standard residential-property CGT rates (typically 24% for higher-rate taxpayers, 18% within the basic-rate band). A narrow BADR route survives: where an FHL business genuinely ceased before 6 April 2025, BADR remains available on a qualifying disposal within three years of cessation (at the BADR rate applicable at date of disposal — 14% for 2025-26, 18% for 2026-27). Pre-sale accounting work — base cost, s.198 CAA fixtures election, trading pack — moves both price and tax bill.

Selling an FHL used to have a beneficial tax path where the business-disposal conditions were met. It was never automatic — the disposal had to qualify on its facts as a business disposal, not merely a property sale — but where the conditions were met, BADR brought the CGT rate to 10% pre-6 April 2025. Post-abolition, most sellers are outside BADR entirely.

Post-FHL, the disposal calculation has three moving parts, all worse for the seller than they were two years ago:

1. Higher-rate CGT of 24% applies to most STL disposals, not the old 10% BADR rate. On a substantial gain, this is often the biggest single cost of the transaction. See "the BADR transitional rule" below for the narrow exception.
2. Capital additions to the base cost are more contested because the record-keeping over ownership has often been informal — and there is a specific constraint on adding items already deducted against income (see below).
3. Buyers underwrite to post-FHL yield, which is materially lower than the FHL-era yield the seller may have in mind.

The BADR transitional rule — who still qualifies

BADR did not disappear on 6 April 2025. FHL abolition removed the special treatment that could support a qualifying BADR claim on an FHL disposal. It did not end every transitional claim, and a property sale was never automatically eligible for BADR — the qualifying-business-disposal conditions always had to be met on the facts. For FHL businesses that genuinely ceased trading before 6 April 2025, BADR remains available on a qualifying disposal made within three years of the cessation date (per s.169I TCGA 1992). The rate applicable is the BADR rate at the date of disposal — 14% for disposals from 6 April 2025 to 5 April 2026 and 18% from 6 April 2026 onwards.

"Cessation" here means what it means for the general BADR test — the FHL business genuinely stopped trading, not merely that the operator continued letting the property under the new post-FHL rules. The Personal Representatives cases and the general BADR case law on business cessation apply. For most operators still trading through the abolition date, this route is not available.

The pre-sale accounting work that closes these gaps is worth doing properly, and the return on it is measured in tens of thousands of pounds on a typical portfolio-scale sale.

The base cost — and the s.39 TCGA constraint most sellers do not know about

Every property has a base cost for CGT: the original purchase price, plus qualifying acquisition costs, plus qualifying capital additions during ownership. On any given property held for 5+ years, the base cost calculation typically comes down to reconstructing years of receipts, quotes and bank transactions.

Section 39 TCGA 1992 is the constraint most sellers do not know about, and the reason "reclassify historically-expensed items into the base cost" is not a free lever: expenditure already deducted against income for income tax purposes cannot then also be added to the CGT base cost. If a kitchen refit was written off as revenue (repairs) against rental income five years ago, it cannot simply be reclassified as capital and added to the sale-time base cost without also correcting the historic income-tax treatment.

The amendment window at 22 September 2026: the ordinary self-assessment amendment window is 12 months from the statutory filing deadline. The 2024/25 return can be amended until 31 January 2027; a 2025/26 return that has been filed early can be amended until 31 January 2028. Earlier years are outside the ordinary amendment window and need a different correction route, and the right route depends on the direction of the error. Where the historic treatment produced an overpayment of tax by the taxpayer, overpayment relief under Schedule 1AB TMA 1970 is a possible route within its four-year window and subject to its own exclusions. Where the historic treatment instead produced an underpayment of tax (for example an item was wrongly deducted from rental income), the fix is a disclosure to HMRC — a settlement of the underpayment with interest, and potentially a Schedule 24 FA 2007 penalty depending on behaviour — not overpayment relief. On the capital-allowance side, retrospective pooling has its own conditions. Expiry of the amendment window is not a categorical bar — but the fix becomes materially more difficult and needs specific analysis.

The proper pre-sale exercise is therefore:

• A full capital additions review covering the full ownership period, cross-referenced to bank statements, invoices and (where available) the previous accountant's fixed asset register.
• Reclassification analysis — where a historic item's true legal nature is arguably capital rather than the revenue treatment it received, establish the correct treatment and the appropriate correction route (return amendment where the window is open; overpayment relief where tax was overpaid and the four-year window is available; disclosure and settlement where the historic treatment instead produced an underpayment; a note against the CGT computation where no double deduction is on offer).
• Proper valuation of any part-personal-use element, where the property was ever occupied by the owner or family.

Where the operator has kept a proper fixed asset register from acquisition (see our chart of accounts piece), this exercise is quick. Where they have not, it takes weeks — but it still produces material savings.

The s.198 CAA fixtures election on sale — a capital-allowances point, not a CGT one

On any sale of a property that carries pooled capital allowances — which can still arise on later disposals where the seller retained a pool balance from the FHL era — the buyer and seller can jointly file a section 198 CAA 2001 election setting the value at which the qualifying fixtures pass between them for capital allowances purposes.

The s.198 election sits inside the capital allowances calculation — it is not part of the CGT computation. What it does is fix the disposal value of the fixtures for the seller's capital allowances pool and the acquisition value for the buyer's pool. A balancing charge or balancing allowance then falls out of the pool arithmetic: the elected value (or, absent an election, the statutory default) is taken to the disposal side of the pool, and the result is compared with the tax written-down value of the pool. Where the disposal value exceeds the pool balance, the excess is a balancing charge assessed on the seller through the income-tax or corporation-tax computation. An agreed election value does not eliminate the possibility of a balancing charge, and it does not on its own give an ordinary post-abolition buyer fresh qualifying expenditure — the buyer's entitlement depends on whether the property meets the applicable capital-allowances tests in the buyer's hands.

The election has a statutory window (typically two years from the date of transfer) and requires agreement between buyer and seller. It is genuinely worth building into the sale contract — solicitors on their own rarely raise it, and the point commonly falls between the accountancy and legal workstreams. See our capital allowances piece for more.

The trading accounts pack for the buyer

A buyer is not just buying a property. They are buying a going concern — a set of bookings, an occupancy record, a review score, a compliance position. The trading accounts pack that supports the sale price is:

• Three years of per-property P&L, post-FHL basis for 2025/26 and prospective basis for 2026/27.
• Occupancy data by month, cross-referenced to booking platforms.
• A clean licence / registration / planning position — a separate exercise handled by our sister firm STL Solutions.
• Fixed asset register so the buyer knows what they are getting in the sale.
• Reasoned tax provision for the buyer on the acquired unit's forward-looking basis.

We do not put a number on the price uplift a proper trading pack produces — outcomes depend on the specific buyer, the specific market and the specific unit, and no accountant can guarantee that a better information pack translates into a better price. What a clean, evidenced trading pack does is remove the routine diligence objections that hold up completion, and it gives a buyer something concrete to underwrite their offer against.

The CGT calculation itself

For sellers, the disposal calculation runs (individual owner, indicative sequence — order and interactions depend on the taxpayer's other gains and losses):

• Sale price
• Less: acquisition cost + qualifying enhancement additions + qualifying selling costs (subject to the s.39 TCGA no-double-deduction rule)
• Less: any Principal Private Residence relief and other applicable reliefs where the property was ever the seller's main residence
• Less: in-year allowable losses (which offset gains in full before the annual exemption)
• Less: the annual CGT exemption (£3,000 for 2024/25 onwards)
• Less: brought-forward capital losses, but only down to the annual exempt amount — the unused balance of brought-forward losses is preserved and carried on
• Multiplied by: the applicable CGT rate

These losses/reliefs do not all sit in one universal sequence. In-year losses are set off against in-year gains before the annual exemption is applied. Brought-forward losses, by contrast, generally reduce remaining gains only to the level of the annual exempt amount, so unused brought-forward losses stay available for future years. Reliefs such as PPR are computed at the gain-quantification stage, not as a straight deduction from the gain figure.

The applicable rate depends on the seller's total taxable income for the year. Residential property gains within an individual's basic-rate band are taxed at 18%; gains falling into the higher-rate band are taxed at 24%. For most STL sellers post-FHL the higher-rate 24% applies to most of the gain, but where the seller has spare basic-rate band available the 18% rate applies up to that ceiling.

The pre-sale exercise focuses on maximising the deductions, using in-year and brought-forward losses in their proper sequence, and, where possible, timing the disposal to make use of two years' annual exemptions. Where a property is owned jointly, both owners can use their annual exemption.

Structural options that sometimes work

Spousal transfer before sale. A pre-sale transfer of part of the ownership to a spouse (where applicable) can access two annual exemptions and, where the spouse is on a lower marginal rate, can reduce the CGT rate on part of the gain. This requires proper legal execution well before sale.

Ltd company disposal alternative. Where the property is held in a Ltd company, the disposal is a corporation tax event on the company's gain, and a subsequent income tax event when the funds are extracted. The overall tax bill is often but not always higher than a personal disposal at 24% CGT. Careful modelling required.

Timing across tax years. Where a large gain would push the seller into the higher CGT rate for a year, splitting the transaction (or timing it to fall in a specific tax year) can materially change the rate. This is only relevant on portfolio-scale disposals and requires structural planning well ahead of any transaction.

What we recommend not doing

Do not list before the accountancy work is done. A property listed with a rough trading pack cannot be re-listed later with a proper one without the buyer noticing. First impressions with a serious buyer are only made once.

Do not accept an offer contingent on the buyer's due diligence without a prepared response pack. Buyers who ask for accounts, tax computations and compliance records mid-negotiation slow the transaction and reduce the seller's negotiating position. Handing over the pack in the first meeting is materially stronger.

Do not disregard the CGT reporting timeline. UK-resident individuals disposing of UK residential property must file a 60-day CGT return and payment on account where CGT is payable on the disposal. Where no CGT is due (e.g. because Principal Private Residence relief covers the whole gain, or the gain is within the annual exemption), the 60-day return is not required. Non-resident persons have broader reporting obligations that apply to residential and non-residential UK land regardless of whether tax is due. Companies report residential-property gains through their corporation tax computation, not the 60-day route.

What operators should do

1. If a sale is likely within 24 months, start the pre-sale accounting work now. Base cost reconstruction and capital additions review takes real time.
2. Get a specific CGT projection for your specific disposal. Do not rely on generic 24% arithmetic - the deductions are the difference between a large tax bill and a manageable one.
3. Address planning status before listing. A property with a Certificate of Lawfulness commands a better price than one without.
4. Speak to your accountant before you speak to an estate agent. The order matters more than most sellers realise.

Selling an STL post-FHL is a materially different exercise from selling one under the old regime. It is not that the sale itself is worse — it is that the pre-sale preparation is now decisive on the outcome. Sellers who do the work in advance keep materially more of the sale proceeds. Sellers who do not, do not.

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Sources: Taxation of Chargeable Gains Act 1992; Section 38 TCGA 1992 (allowable expenditure); Section 39 TCGA 1992 (no double deduction); Section 169I TCGA 1992 (BADR qualifying business disposals); Section 198 Capital Allowances Act 2001 (fixtures elections); HMRC — Capital Gains Manual (CG64200 series on business asset disposal relief); HMRC — Report and pay Capital Gains Tax on UK property (60-day return); HMRC — PIM2030 Deductions: repairs and renewals; Section 9 TMA 1970 (Self Assessment amendments).