A limited company BTL mortgage is assessed differently from an individual BTL mortgage: the borrower is the company (which typically has no credit history or trading record), the lender assesses the director-shareholders personally, and a personal guarantee is required. Understanding these differences — particularly the personal guarantee, which effectively removes the liability protection that incorporation was supposed to provide — is essential before choosing the limited company route for mortgage finance.
The stress test applied to limited company BTL mortgages is typically more favourable than for individual BTL mortgages, because lenders apply the assessment based on corporation tax rates rather than the 40% higher-rate income tax assumption used for individual borrowers. This means limited company BTL mortgages can sometimes achieve higher LTV lending at a given rental income than the equivalent individual product — which is one of the practical borrowing benefits of the SPV structure, alongside the Section 24 tax advantage.
SPV structure requirements, personal guarantees and stress testing
The three most important aspects of limited company BTL mortgage lending that differ materially from individual BTL lending are the SPV requirement, the personal guarantee, and the rental stress test:
- SPV (Special Purpose Vehicle) structure — lender requirements: The vast majority of limited company BTL mortgage lenders require the borrowing company to be an SPV — a company incorporated specifically and solely for the purpose of holding investment property. This is confirmed by the company's SIC (Standard Industrial Classification) code, which should be: 68100 — 'Buying and selling of own real estate' (for companies that also intend to sell properties); or 68209 — 'Other letting and operating of own or leased real estate' (for pure rental holding companies). A company with a SIC code for an active trading business (e.g., 82990 — other business support service activities; or any retail/manufacturing/service SIC) will be rejected by most BTL lenders, even if the actual business activity has ceased and the company now holds only property. To qualify for a limited company BTL mortgage as an SPV, the company must: (a) be incorporated in England and Wales (for English properties) or Scotland (for Scottish properties); (b) have a UK registered office address; (c) have Articles of Association that permit the company to hold, let, and mortgage property; (d) ideally have been incorporated recently with no prior trading history (a company with a complex historical trading record creates additional due diligence requirements for the lender). The SPV does not need a minimum period of trading history before applying for a mortgage — most lenders will consider newly incorporated SPVs. Note: some lenders also consider 'portfolio landlord' companies (where the SPV holds multiple properties) — these require a more detailed lender assessment of the whole portfolio, including a portfolio-level interest cover ratio
- Personal guarantees — the corporate veil removed: The corporate veil — the principle of limited liability that separates a company's debts from its shareholders' personal assets — is almost universally removed for limited company BTL mortgages by the personal guarantee requirement. Every limited company BTL mortgage lender (without exception in the mainstream market) requires the director-shareholders (typically any director or shareholder with a stake of 20-25% or more) to execute a personal guarantee of the company's mortgage obligations. The personal guarantee is typically unlimited — the guarantor is personally liable for the full outstanding mortgage debt (capital; interest; arrears; enforcement costs; receiver costs) if the company defaults. Some lenders offer limited guarantees (capped at a percentage of the outstanding debt or the equity value), but unlimited personal guarantees are the standard. The practical effect: a landlord who borrows inside an SPV with a personal guarantee has exactly the same personal financial exposure as if they had borrowed on a personal BTL mortgage — the SPV structure provides no additional personal liability protection for the mortgage debt. The tax advantages of the SPV structure (Section 24; corporation tax vs income tax rates; dividend extraction flexibility) are therefore the primary reason for the limited company structure — not liability protection for mortgage debt. Landlords should understand and accept this before incorporating solely in the hope of limiting personal exposure to mortgage debt
- Rental stress test — more favourable than individual BTL: Individual BTL lenders typically stress test rental income at 125-145% of the mortgage payment calculated at a reference rate of 5.5% or higher, with an additional adjustment for higher-rate income tax (40%). This reflects the FCA's concern that a higher-rate taxpayer landlord's net rental income (after Section 24 restriction) may be insufficient to service the mortgage. For example, on an individual BTL application: a £200,000 mortgage at 5% would require approximately £13,750 annual rental income at 125% stress at 5.5% — before the higher-rate taxpayer adjustment. For limited company BTL lenders, the stress test is typically 125% of the mortgage payment at 5.5% (or the product rate, whichever is higher) — but WITHOUT the additional higher-rate taxpayer adjustment, because the company pays corporation tax (25% on profits over £250,000; 19-25% for profits between £50,000 and £250,000 under marginal relief; 19% for profits under £50,000) and is not subject to Section 24 (mortgage interest is fully deductible as a business expense). This means limited company BTL mortgages achieve a lower required rental income for the same loan amount — effectively allowing higher LTV at the same rental income. This is a genuine borrowing benefit of the SPV structure, in addition to the tax advantages
Product availability, lender requirements, incorporation costs and inter-company loans
The practical aspects of applying for and maintaining a limited company BTL mortgage — and the costs of incorporating an existing personal BTL portfolio:
- Product availability, rates and lender requirements: Prior to 2017, limited company BTL mortgage products were offered by only a handful of specialist lenders and were significantly more expensive than individual BTL products. The Section 24 changes have driven a major expansion in limited company BTL product availability — the market now includes a wide range of specialist and mainstream lenders. Lenders in the limited company BTL market include: Paragon Bank; Foundation Home Loans; Precise Mortgages; Together; Fleet Mortgages; The Mortgage Works (a Nationwide subsidiary — primarily for portfolio landlords); Barclays (via its specialist team); NatWest (via specialist team); Aldermore; Shawbrook; and numerous challenger banks and specialist intermediaries. Rates are typically 0.2-0.5% higher than equivalent individual BTL products — reflecting the additional due diligence (company searches; personal guarantee documentation; solicitor's undertaking) and the different risk profile. For HMOs, multi-unit freehold blocks (MUFBs), and properties above £500,000, the limited company BTL product range is narrower and rates are higher. At application, lenders require: Certificate of Incorporation; Memorandum and Articles of Association; director(s) and shareholder(s) personal identification and proof of address; personal credit report checks on all directors/shareholders with significant stakes; schedule of existing properties (both personal and company-owned — lenders assess the whole portfolio); rental income projections or existing tenancy agreements; personal guarantee documentation (typically drafted by the lender's solicitors); confirmation from the borrower's solicitors of the SPV structure and SIC code; and a mortgage offer and legal charge over the property
- Incorporation transfer costs and inter-company loans: A landlord who owns BTL properties personally and wishes to transfer them into a limited company to access Section 24 benefits faces significant one-off tax costs that in many cases make immediate incorporation uneconomic: (a) Capital Gains Tax on disposal at market value: the transfer of property to a connected company is a disposal at market value (TCGA 1992 s.17), triggering CGT on any accrued gain. Incorporation relief (TCGA 1992 s.162) may defer the gain where the landlord is transferring a genuine 'business' rather than investment assets — but HMRC's view is that a simple portfolio of rental properties is an investment rather than a business for s.162 purposes, so the relief is uncertain and contested; (b) SDLT at market value (plus 3% surcharge): the transfer to a connected company is a notional transaction at market value for SDLT purposes (FA 2003 s.53), plus the 3% surcharge applies (as the company is purchasing additional dwellings). LBTT (Scotland) and LTT (Wales) apply equivalent rules. For a portfolio of BTL properties, the combined CGT and SDLT costs of incorporation typically amount to a significant proportion of the portfolio's equity — making immediate incorporation uneconomic for most established personal landlords. The more common approach is to acquire future properties directly into the SPV (rather than transferring existing properties) so that the SPV accumulates new properties without triggering these costs. Inter-company loans: where a landlord operates a group structure (a holding company with multiple property SPVs as subsidiaries), inter-company loans between the entities are governed by transfer pricing rules under TIOPA 2010 Part 4 — any interest charged on inter-company loans between connected companies must be at an arm's length rate (or the excess over arm's length will be disallowed for tax). Inter-company loans between SPVs are not BTL mortgages and do not require mortgagee registration at HMLR — though a legal charge between connected companies can be registered at HMLR for security purposes
Frequently asked questions
Does a personal guarantee on a limited company BTL mortgage mean I lose the benefit of limited liability?+
For that mortgage debt, yes. Virtually all limited company BTL lenders require an unlimited personal guarantee from the director-shareholders. If the company defaults on the mortgage, the lender can pursue you personally for the full outstanding debt — capital, interest, arrears, and enforcement costs. The corporate veil is effectively removed for this specific debt. The limited liability protection of the company structure does not extend to guaranteed mortgage obligations. The primary benefit of the SPV structure for BTL is the tax advantage (full mortgage interest deduction; no Section 24 restriction; corporation tax vs income tax) — not personal liability protection for mortgage debt.
Why is the limited company BTL mortgage stress test more favourable than individual BTL?+
Individual BTL lenders apply a stress test that assumes you are a higher-rate (40%) income taxpayer and applies the Section 24 restriction — meaning the lender assesses your net rental income after a significant tax adjustment. Inside a limited company, mortgage interest is fully deductible as a business expense before corporation tax (no Section 24 restriction applies to companies), and the tax rate is corporation tax (25% max) rather than 40% income tax. Limited company BTL lenders apply the stress test at 125% of the mortgage payment at 5.5% without the higher-rate taxpayer adjustment — typically requiring lower rental income for the same loan amount than the equivalent individual BTL mortgage.
Can I transfer my existing personally-owned BTL properties into a limited company?+
Technically yes, but the tax costs are usually prohibitive. The transfer to a connected company is a disposal at market value for CGT purposes (triggering tax on any accumulated gain), plus SDLT at market value plus the 3% surcharge. For a property with significant capital appreciation, the combined CGT and SDLT bill can amount to a large proportion of the equity. Incorporation relief (TCGA 1992 s.162) might defer the CGT where a genuine property business is transferred, but HMRC takes a restrictive view of what constitutes a 'business' for this purpose. Most established landlords find it more practical to leave existing properties in their personal ownership and acquire new properties directly into the SPV.
Which lenders offer limited company BTL mortgages in 2026?+
The limited company BTL market has expanded significantly since 2017. Key lenders include: Paragon Bank; Foundation Home Loans; Precise Mortgages; Together; Fleet Mortgages; Aldermore; Shawbrook; The Mortgage Works (Nationwide); and specialist teams at Barclays and NatWest. Rates are typically 0.2-0.5% higher than individual BTL equivalents. HMOs, multi-unit freehold blocks, and high-value properties have a narrower product range. Always use a specialist BTL mortgage broker who understands the limited company BTL market — lender criteria and product availability change frequently and differ significantly.
- Limited company BTL — tax structure, Section 24 and dividend extraction →
- Buy-to-let mortgage — individual BTL rates, stress tests and criteria →
- BTL remortgage — product switch, LTV and affordability →
- Section 24 — finance cost restriction and its impact on landlord tax →
- Corporation tax — BTL property company tax obligations →
- Director salary and dividends — extracting profits from a property company →