SPV incorporation for UK landlords
When the numbers work.

What an SPV is

A Special Purpose Vehicle is a limited company set up for one purpose: in this case, holding and letting residential property. Mechanically it is no different from any other Companies House-registered limited company, but it is defined by what it does not do. It does not trade, employ staff, carry stock, or sell services. Its assets are properties and its income is rent.

Lenders care about this distinction because a clean property-only company is straightforward to underwrite. A trading company that also happens to own a few flats is not, and many buy-to-let lenders will simply decline it. The SIC code filed at Companies House signals which category your company is in.

SIC Codes and Lender Rules

Most buy-to-let lenders require one of two SIC codes at incorporation:

• 68100. Buying and selling of own real estate.
• 68209. Other letting and operating of own or leased real estate.

Getting the SIC code wrong at incorporation, or adding unrelated trading activities later, can invalidate lender pre-approvals. It is one of the most common avoidable mistakes landlords make when setting up their own company before talking to a broker.

How the economics change inside an SPV

Four structural changes drive the incorporation case:

• Full mortgage interest deduction restored. Inside a company, finance costs are deductible in full against rental profit, not restricted to a basic-rate credit.
• Corporation Tax rather than Income Tax. Rental profit is taxed at 19% up to £50,000, rising to 25% above £250,000, with marginal relief in between, compared with personal rates up to 45%.
• Retained profit compounds faster. Profit kept inside the company to fund deposits on the next acquisition is only taxed at Corporation Tax rates, not extracted and taxed personally first.
• No band-drag on other income. Rental profit stays inside the company and does not inflate your personal taxable income, which preserves personal allowances, avoids the High Income Child Benefit Charge, and keeps salary and dividend planning clean.

The catch is that money eventually needs to come back out. Extracting profit from the SPV as salary or dividends is taxed again personally, so the structure works best for landlords who are reinvesting profit into further acquisitions rather than relying on the rental income to live on.

Transfer costs: CGT and SDLT

Moving personally owned property into a limited company is treated by HMRC as a disposal at open market value. Two costs crystallise on day one:

These upfront costs are the main barrier to incorporation and the single largest variable in any break-even calculation. A three-property portfolio valued at £750,000 can face £30,000-£50,000 in combined CGT and SDLT depending on the gain and the structure. The commercial question is whether the ongoing annual tax arbitrage justifies that one-off cost across your expected holding period.

Incorporation relief under s162 TCGA 1992

Section 162 of the Taxation of Chargeable Gains Act 1992 can defer the Capital Gains Tax charge when an unincorporated business is transferred to a company in exchange for shares. For landlords, the relief is case-by-case and turns on whether HMRC accepts the letting activity as a genuine business rather than passive investment.

The leading authority is Ramsay v HMRC [2013], where the First-Tier Tribunal held that a single landlord actively managing a portfolio full-time could qualify for s162 relief. The test, broadly, is whether the activity is organised and substantive enough to look like a business from the outside.

Two important caveats. First, s162 defers rather than eliminates the CGT. The gain is rolled into the base cost of the shares and crystallises on eventual sale or winding up of the company. Second, s162 does not help with SDLT. The SDLT charge remains payable in full on market value. A separate SDLT partnership relief can apply in narrow circumstances (genuine partnership structures with the right ownership history) but it is not available to sole traders moving their own property into a new company.

The phased alternative: buy new through the SPV

For many landlords, the most cost-effective strategy is not to transfer existing property at all. Instead, every future acquisition is purchased through a newly incorporated SPV from day one, while personally held property stays where it is.

This avoids the transfer-day CGT and SDLT hit entirely. It does mean the portfolio is held in two structures for a period, but over time, as older personally held properties are sold (which triggers CGT anyway) or gifted to a spouse, the weighting shifts naturally towards the company. The migration is gradual, and the break-even maths is cleaner because there is no one-off cost to recover.

The trade-off is that the mortgage interest restriction continues to bite on the existing personal properties during the transition. Whether that matters depends on gearing. On a low-LTV property where finance costs are modest, the Section 24 drag is bearable. On a heavily geared property it is not, and a full incorporation starts to look more attractive even accounting for the transfer costs.

Ongoing admin and cost of a corporate structure

An SPV is still a limited company, with all the compliance that entails: annual statutory accounts filed at Companies House, a confirmation statement each year, a Corporation Tax return filed with HMRC, and bookkeeping throughout. If the director takes salary, PAYE registration and monthly payroll filings are added to the list.

This administrative overhead is the true cost-of-entry that gets understated. It is not prohibitive (a well-run SPV with one or two properties generates a manageable amount of work) but it is a real annual cost, and any incorporation model needs to include it alongside the SPV mortgage rate differential and the one-off transfer taxes.

On the plus side, the corporate structure makes certain things easier: multiple shareholder splits (useful for family planning), clean succession routes, separate borrowing against the company's assets without personal guarantees in some cases, and a tidier audit trail for lenders and regulators.

When incorporation does not make sense

Not every landlord should incorporate. Cases where the numbers usually fail:

• Single-property or lightly-geared landlords. Section 24 barely bites without material mortgage interest to restrict, so the saving is too small to recover the transfer costs.
• Landlords planning to sell within 3-5 years. The break-even on incorporation costs often runs to 5-10 years of ongoing Corporation Tax savings. A short remaining hold shortens the recovery window too much.
• Landlords relying on the rental income personally. If every pound of profit is extracted as dividends or salary to live on, the double-tax drag (Corporation Tax plus personal dividend tax) reduces the arbitrage significantly. Incorporation favours landlords reinvesting into further acquisitions.
• Portfolios with large latent gains. A property bought twenty years ago at a fraction of today's value carries a CGT charge on transfer that can be large enough to dominate the calculation. Even with s162 relief (deferral, not elimination), the recovery window can be untenable.

This is why the decision depends on running the numbers first. The headline tax arbitrage looks compelling on a one-line comparison, but the full lifetime picture (including SDLT, CGT, SPV mortgage rates, ongoing admin cost, and eventual extraction tax) is the number that matters.