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

In short: The FHL regime abolition removed the 10% Business Asset Disposal Relief rate that previously applied to qualifying holiday-let disposals. STL sellers now face 24% higher-rate CGT on the gain. The pre-sale accounting work that used to be optional is now decisive - the base cost calculation, the capital additions history, and the trading accounts pack together move both the sale price and the tax bill.

Selling an STL used to be a benign tax event. Business Asset Disposal Relief brought the CGT rate down to 10%, capital allowances had been claimed all through ownership, and buyers underwrote to the FHL-era tax position. That is no longer the picture.

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 the gain, not the 10% BADR rate. On a substantial gain, this is often the biggest single cost of the transaction.
2. Capital additions to the base cost are more contested because the record-keeping over ownership has often been informal.
3. Buyers underwrite to post-FHL yield, which is materially lower than the FHL-era yield the seller may have in mind.

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 why it is usually wrong

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 - most of which are either missing or ambiguous.

Every £1,000 of missed capital additions is a £240 CGT overpayment at higher rate. On a property with a decade of ownership, missed additions of £15,000-£30,000 are common. That is £3,600-£7,200 of avoidable tax.

The pre-sale accounting work here is:

• 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 of items historically expensed that should have been capitalised - kitchens, bathrooms, structural improvements, extensions.
• 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 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 - which is a separate exercise handled by our sister firm.
• 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.

The difference in sale price between a property presented with a professional trading pack and one presented without is usually 5-15% of headline value, dependent on the buyer's sophistication. On a £400,000 sale, that is £20,000-£60,000 of price uplift for a few weeks of proper accountancy work.

The CGT calculation itself

For sellers, the disposal calculation runs:

• Sale price
• Less: acquisition cost + qualifying additions + qualifying selling costs
• Less: annual CGT exemption (currently £3,000 for 2024/25 and later years - historically much higher)
• Multiplied by the applicable rate (24% higher rate for most STL sellers post-FHL)

The pre-sale exercise focuses on maximising the deductions 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 - a modest but real saving.

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 residential property disposals require a CGT return and payment within 60 days of completion. This is a hard deadline and penalties for late filing are automatic.

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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