Specialist US UK Tax Services: Sale and Leaseback Guide

When an American who personally owns the freehold of their UK company's premises sells it to an investor and the company leases it back, the owner reports a UK capital gain on Self Assessment and a US gain under section 1001 on Form 4797, including unrecaptured section 1250 gain, with UK tax credited against US tax.

That is the short answer. The detail is where returns go wrong. This is a compliance-led guide from our Specialist US UK Tax Services team at Jungle Tax. It is written for founders and executives who have already completed a sale and leaseback, or are about to, and now need both returns prepared correctly. We do not structure the deal. We make sure the completed transaction is reported once, consistently and defensibly, to HMRC and to the IRS.

What does a sale and leaseback of your own premises look like for tax purposes?

The pattern is common among American founders in the UK. Years ago you bought the freehold of the office, warehouse or workshop personally, often with a sterling commercial mortgage, and let it to your UK trading company. The company paid you rent, or sometimes paid nothing. Now an institutional or private investor buys the freehold from you, your mortgage is redeemed out of the proceeds at completion, and the company signs a new long lease with the investor.

For tax purposes that single commercial event breaks into several separate items, and each country looks at them differently:

• Your personal disposal of the freehold, which is a chargeable gain in the UK and a section 1231 / section 1001 disposal in the US.
• The redemption of your sterling mortgage, which has no UK tax consequence for an individual but can produce a separate US foreign currency gain or loss under section 988.
• Your historic rental income from the company, which shapes both the UK relief position and the US depreciation recapture.
• The company's new lease, which belongs to the company's own UK return and, for you, to Form 5471.
• The buyer's Stamp Duty Land Tax, which is the buyer's liability, not yours.

Most published commentary handles only one country. US-focused pages discuss recapture and recharacterisation but ignore UK capital gains tax; UK pages discuss Business Asset Disposal Relief but say nothing about how the same gain is computed in dollars. The real risk for an American owner sits in the gap between the two.

UK side: capital gains tax on the personal disposal

How the UK gain is computed

The UK computation is in sterling throughout. The gain is the disposal proceeds less the original acquisition cost, incidental costs of acquisition and sale (legal fees, agents' fees, valuation fees) and qualifying capital improvement expenditure. Crucially, UK capital gains tax does not reduce your base cost for the accounting depreciation or the US depreciation you claimed. The UK and US gains are therefore almost always different numbers, and that difference is expected rather than an error.

Two UK capital allowances points often get missed on commercial property:

• Fixtures. If you claimed capital allowances on fixtures and integral features (lighting, heating, lifts, air conditioning) in your property rental business, the sale triggers a disposal value in your capital allowances computation. Buyers of commercial property usually insist on a joint fixtures election that fixes the value attributed to fixtures. That agreed figure flows into your final rental computation and can create a balancing charge, so it must be read from the sale contract, not estimated.
• Structures and Buildings Allowance. If you claimed Structures and Buildings Allowance on qualifying construction or renovation spend, the allowances claimed are generally added to your disposal proceeds for capital gains purposes, increasing the UK gain.

Rates, exemption and the reporting deadline

For a UK-resident individual, gains above the annual exempt amount are taxed at the main capital gains tax rates, which since 30 October 2024 have been 18% within the basic rate band and 24% above it, for residential and non-residential property alike. The annual exempt amount is currently £3,000.

Commercial property is reported differently from a home. A UK resident disposing of UK non-residential property is not required to file the 60-day UK property return; the gain is reported on the Self Assessment return for the tax year of disposal and the tax is due by 31 January following that year. If you were non-UK resident at completion, the position changes: non-residents must report disposals of any UK land, including commercial premises, within 60 days of completion. The date that matters is the date of exchange of unconditional contracts, which for UK capital gains tax is generally the date of disposal even if completion follows later.

Can Business Asset Disposal Relief apply as an associated disposal?

This is the question owners ask most, and the honest answer is usually more restrictive than they hope. Business Asset Disposal Relief (formerly Entrepreneurs' Relief) can, in principle, extend to a personally owned asset used by your trading company, but only as an associated disposal. Broadly, the asset disposal has to accompany a qualifying material disposal of your shares in the company and be part of your withdrawal from participation in the business, alongside conditions on how long the asset was owned and used in the business.

In a typical sale and leaseback, you keep your shares, the company keeps trading and you keep running it. There is generally no accompanying material disposal and no withdrawal from the business, so the premises sale will usually stand alone and fall outside the relief. We flag this because we regularly see draft returns that claim the reduced rate on a leaseback gain without any share disposal at all. That claim is very likely to fail on enquiry.

Where an associated disposal genuinely does exist, for example because the leaseback forms part of a wider exit in which you sell a qualifying shareholding, rent becomes the second hurdle. HMRC's guidance on the restrictions on relief for associated disposals explains that where the asset was made available to the business for rent, the relieved gain can be restricted on a just and reasonable basis, broadly by reference to how far the rent paid fell below a full market rent and over which periods it was paid. A full market rent for the whole period can remove relief on the asset entirely. Only rent for periods after 5 April 2008 is taken into account. These rules are fact-specific, and we treat them as a point for careful review rather than a calculation to assume.

If relief does apply, note the rate: HMRC's Business Asset Disposal Relief guidance sets out the current rate and the £1 million lifetime limit. The rate rose to 14% for disposals from 6 April 2025 and to 18% from 6 April 2026, the same as the lower main rate, so for 2026/27 disposals the remaining benefit is mainly for higher-rate taxpayers.

SDLT is the buyer's tax, but the lease is not irrelevant

Stamp Duty Land Tax on the freehold purchase is paid by the investor. You do not report it and it does not form part of your capital gains computation. The new lease, however, is a land transaction for the company and may carry its own SDLT on the net present value of the rent. Sale and leaseback relief is designed for cases where the seller and the tenant are the same person; where you sell personally and your company takes the lease, the relief may not be available. That is a matter for the company's own filing, but it explains why the company may have an SDLT return you were not expecting.

US side: reporting the gain under section 1001

Amount realised and adjusted basis, in dollars

As a US citizen or green card holder you report the sale on your US return regardless of where you live. Gain under section 1001 is the amount realised less your adjusted basis, and both sides are computed in US dollars using the exchange rate on the relevant date:

• Amount realised: the sterling sale price, less selling costs, translated at the spot rate on the date of sale. The fact that part of the price was used to clear your mortgage does not reduce the amount realised.
• Adjusted basis: the original cost translated at the spot rate on the date of purchase, plus capital improvements translated at the rate on the date each was paid, less the depreciation allowed or allowable, computed in dollars.

Because cost and proceeds are translated at different dates, a sterling gain can become a larger or smaller dollar gain, and a sterling loss can even become a dollar gain. The currency movement on the property itself is part of the section 1001 gain, not a separate item.

Unrecaptured section 1250 gain on depreciation claimed on Schedule E

If you reported the company's rent on Schedule E, you should have claimed depreciation. Commercial real property used predominantly outside the United States must generally be depreciated under the alternative depreciation system, which for nonresidential real property means straight line over 40 years. Straight-line depreciation on real property is not recaptured at ordinary rates, but the gain attributable to it is unrecaptured section 1250 gain, taxed at a maximum federal rate of 25% rather than the 20% long-term capital gains rate.

The sale is reported on Form 4797 as a section 1231 disposal, with the unrecaptured section 1250 figure carried through the Schedule D worksheet. Section 1231 gains are netted with other section 1231 items in the year and are subject to the five-year look-back for prior net section 1231 losses.

Two points deserve emphasis. First, recapture applies to depreciation allowed or allowable. If you never claimed depreciation, the IRS still reduces your basis as if you had, so you pay the 25% band without ever having had the deduction. That is often recoverable through an accounting method change on Form 3115 in the year of sale, which can be more efficient than amending multiple years. Second, if the property was let to your company at no rent, there may have been no Schedule E activity and no depreciation at all; the treatment then depends on how the arrangement was reported historically.

The 3.8% Net Investment Income Tax

The gain may also attract the 3.8% Net Investment Income Tax for owners above the threshold. The IRS position is that foreign tax credits cannot offset this tax, and the US courts have so far agreed. Whether self-rental to your own trading company changes the character of the income for this purpose is technical, and we review it case by case.

Could the IRS treat the leaseback as a financing?

This is the risk generalist pages mention but rarely connect to a UK owner. For US federal tax purposes, a sale and leaseback is respected only if the buyer actually acquires the benefits and burdens of ownership. Under the long-standing Frank Lyon framework and later IRS guidance, the factors include whether the price and rent are at market levels, the length of the lease relative to the building's useful life, fixed-price repurchase options, whether rent tracks the buyer's debt service, and who bears the risk of loss and the residual value.

If the arrangement looks more like a secured loan than a sale, the IRS can treat the investor as a lender and you as still owning the property. The cross-border consequence is uncomfortable: HMRC will tax a disposal in the UK year of exchange, while the US recognises no sale and no gain. The UK tax then has no matching US income in that year, and the foreign tax credit has to be carried back one year or forward up to ten years.

Most arm's-length sales to unrelated institutional investors at market rent, with no repurchase option, are respected. The risk rises sharply when the buyer is connected to you, when the lease contains a below-market buy-back option, or when the "rent" is set as a fixed return on the price. We do not redesign the deal, but we do read the lease before we file, because the US characterisation drives everything that follows.

The sterling mortgage: section 988 currency gain or loss at completion

Most US owners overlook this entirely, and UK accountants have no reason to look for it. A sterling mortgage is a foreign-currency liability for a US taxpayer. Under section 988, when you repay it, you have a foreign currency gain or loss equal to the difference between the dollar value of the principal when you borrowed and its dollar value when you repaid.

If sterling has weakened against the dollar since you borrowed, you repay the loan with fewer dollars than you received, which is a currency gain. If sterling has strengthened, you have a currency loss. Because the property was held to produce rental income, the exception for personal transactions does not usually apply, so the result is generally ordinary income or loss. It is reported separately from the capital gain on the building, and it does not appear anywhere on the UK return.

Each scheduled principal repayment over the life of the loan is technically its own section 988 event, so the redemption at completion is the final and usually the largest instalment. Where earlier years were not reported, we quantify the historic amounts and decide whether correction is warranted.

Matching the UK tax with the US foreign tax credit

Gain from the sale of real property is sourced where the property is located, so the gain on UK premises is foreign-source income and UK capital gains tax paid on it is creditable on Form 1116. The mechanics are where returns go wrong:

• Different gains. The UK gain ignores depreciation; the US gain is computed in dollars after depreciation. A larger US gain can leave residual US tax even after credit, especially on the 25% unrecaptured section 1250 band.
• Different tax years. The UK tax year runs 6 April to 5 April; the US year is the calendar year. A completion in, say, March 2027 falls in the UK 2026/27 tax year and the US 2027 year, with the UK tax paid in January 2028. Cash-basis filers may not be able to claim the credit until the year of payment unless they elect the accrual method for foreign taxes.
• Basket. Gain on rental property generally falls in the passive category basket. Excess credits from that basket cannot shelter tax on salary in the general basket.
• Rate translation. UK tax is translated at the rate on the date paid for cash-method filers, or at the average rate for the year where the accrual election applies.
• No credit for Net Investment Income Tax, as noted above.

UK and US treatment side by side

What the company's side means for your Form 5471

Your UK trading company is a controlled foreign corporation, so its side of the transaction appears on your Form 5471. In practice that means rent previously paid to you appears as a related-party transaction on Schedule M, the new lease with the investor changes the company's expenses and earnings and profits from the completion date onward, and any SDLT on the lease is a company cost. It does not change your personal gain, but the two returns must tell the same story.

A worked illustration in outline

Consider an owner who bought premises for £1.2 million in 2014 with a £800,000 sterling mortgage, let them to the company at market rent, claimed US depreciation on Schedule E, and sells to an investor for £2.4 million in 2026, redeeming a £500,000 balance at completion. The figures below are illustrative only:

• UK: a sterling gain of roughly £1.2 million before costs, no Business Asset Disposal Relief because no shares were sold, taxed mainly at 24% on the Self Assessment return, plus any capital allowances balancing charge on fixtures.
• US: proceeds translated at the 2026 rate, cost at the 2014 rate, basis reduced by twelve years of 40-year straight-line depreciation; the depreciation portion falls in the 25% band, the rest at up to 20%, with NIIT on top where applicable.
• Section 988: because sterling bought far more dollars in 2014 than in 2026, repaying the remaining principal costs fewer dollars than were borrowed, producing an ordinary currency gain.
• Credit: UK capital gains tax credited in the passive basket, with any residual US tax concentrated on the section 1250 band and the currency gain.

When the sale exposes earlier gaps

A disposal often brings older problems to the surface. Rent from the company was never reported on the US return; depreciation was never claimed; the sterling account that received the proceeds was missing from your FBAR or Form 8938; or Form 5471 was never filed for the company. These are fixable. Depending on the facts, the route may be a method change, amended returns, or the IRS Streamlined Filing Compliance Procedures for non-wilful taxpayers. Our IRS streamlined filing experts regularly handle catch-up filings triggered by a property sale.

Preparation checklist for both returns

• Completion statement, contract, and the date of exchange of unconditional contracts.
• Original purchase documents and evidence of every capital improvement with dates.
• Any fixtures election and capital allowances or Structures and Buildings Allowance history.
• Rent history from the company, including any periods at nil or below market rent.
• Prior US Schedule E and depreciation schedules.
• Mortgage drawdown and repayment history, with dates and amounts.
• The new lease and any option or buy-back terms.
• Bank statements for the account receiving the proceeds, for FBAR and Form 8938.

For related reading, see our US tax services, UK tax services and cross-border tax planning pages, or browse more guides.

Speak to a cross-border specialist

A sale and leaseback is one transaction with two very different tax answers. If you have sold, or are about to sell, the freehold of your company's premises and need the UK and US returns prepared consistently, including recapture, currency gain and the foreign tax credit, contact our cross-border team for a confidential consultation.