Company buy-to-let mortgage rates in 2026 run higher than personal BTL rates, with the differential typically sitting between 0.4 and 1.0 percentage points depending on loan-to-value, company structure, director profile, and the specific lender. The gap has narrowed considerably from the early years of company BTL lending as more mainstream lenders entered the market, but it remains a real cost that needs to be weighed in any personal-vs-company decision.
This guide explains what drives company BTL pricing, the underwriting requirements landlords actually face (ICR, stress tests, personal guarantees, SIC codes), the arrangement fee structure, and how the tax treatment interacts with the mortgage cost. We do not publish specific rate numbers because they change weekly; always confirm current rates via a specialist BTL broker before making decisions.
What Drives Company BTL Mortgage Pricing
Six factors determine the rate your SPV gets quoted:
- Loan-to-value (LTV). Lower LTV gets better rates. The standard tiers are 60%, 65%, 70%, 75%, with sharp price increases above 75% for company applications and limited availability above 80%.
- Fixed period. 2-year fixes price differently from 5-year fixes. Longer fixes typically carry higher rates but lock in certainty. 10-year fixes exist but with much narrower lender pools.
- Company structure complexity. Single-director SPV with one shareholder is the simplest case. Multi-director SPVs, holding companies with multiple subsidiary SPVs, family investment companies, or trusts as shareholders all face more limited lender pools and often higher rates.
- Director landlord experience. Lenders distinguish between first-time SPV applicants with personal BTL experience, first-time SPV applicants with no BTL experience, and established company portfolio landlords. The first group typically gets reasonable rates; the second faces a narrow market with rate premiums; the third gets the best terms.
- Property type and location. Standard residential BTL gets the broadest lender pool. HMOs, MUFBs (multi-unit freehold blocks), holiday lets, and commercial-residential mixed-use all face narrower lender pools with rate premiums.
- Lender appetite at the time of application. BTL lender appetite shifts with the wider funding environment. The same lender that was offering competitive rates one quarter may be repricing six months later. A specialist broker tracking live appetite is usually faster than monitoring lender websites.
Interest Cover Ratio (ICR) Requirements
The ICR is the relationship between expected rental income and mortgage interest, calculated at the lender's stress-test rate. It is the single biggest determinant of how much you can borrow.
| Borrower type | Typical ICR requirement | Typical stress-test rate |
|---|---|---|
| Limited company BTL | 125-145% | 5.5-7.0% |
| Personal BTL (basic-rate taxpayer) | 125-145% | 5.5-7.0% |
| Personal BTL (higher-rate taxpayer) | 140-160% | 5.5-7.0% |
| Specialist HMO BTL (in company) | 130-150% | 5.5-7.0% |
The higher ICR for higher-rate personal BTL reflects Section 24's impact on the borrower's after-tax cash position. Inside a limited company, the borrower's tax position is corporation tax at 19-25%, which the lender views as more predictable than personal income tax with Section 24 add-backs.
Worked example: a £200,000 company BTL mortgage at 5.5% stress test with 125% ICR requires annual rent of at least £13,750 (£1,146/month). At 145% ICR, the same loan requires £15,950 (£1,329/month). The same property's actual rental income determines how much you can borrow.
Personal Guarantees and the "Limited Liability" Reality
Personal guarantees from all directors and significant shareholders are standard on company BTL mortgages. The PG makes the director personally liable for the mortgage debt if the company defaults, which significantly reduces the practical "limited liability" benefit of company ownership for borrowing purposes.
In practical terms: if your SPV defaults on the mortgage, the lender can pursue you personally for any shortfall after sale of the property. The company structure protects you from non-mortgage creditors (tenant claims, contractor disputes, environmental liabilities), but the mortgage itself effectively pierces the corporate veil via the PG.
Some lenders accept reduced guarantees for established borrowers with strong track record: limited-period guarantees, partial guarantees on a portion of the loan, or guarantees that fall away after certain LTV thresholds are reached through repayment. These are negotiated case-by-case via a specialist broker.
SIC Codes and the SPV Requirement
BTL lenders almost universally require the borrowing company to be a Special Purpose Vehicle (SPV) registered with property-investment SIC codes only:
- 68100: Buying and selling of own real estate
- 68201: Renting and operating of Housing Association real estate
- 68202: Letting and operating of conference and exhibition centres
- 68209: Other letting and operating of own or leased real estate
The most common combination for a residential BTL portfolio is 68100 + 68209. Companies with trading SIC codes (consulting, retail, services, manufacturing) are typically excluded or face more limited lender appetite. If your existing company has mixed activities, you usually need to register a new SPV for BTL purchases, which is straightforward via Companies House but adds setup time.
The Tax Side: Where Company Mortgages Win
The headline company BTL mortgage rate is higher than personal, but the tax treatment differs in ways that often more than compensate:
- Full mortgage interest deduction. Inside a limited company, mortgage interest is fully deductible against rental profit before corporation tax. There is no Section 24 restriction. For a higher-rate personal landlord with £15,000 of mortgage interest, the after-tax cost is roughly £12,000. Inside a company, the after-tax cost is roughly £11,400 (25% corporation tax) or £12,150 (19% corporation tax). The difference looks modest in isolation but compounds across multiple properties and years.
- Arrangement fees and broker fees fully deductible. All finance-related costs inside a company come straight off rental profit before corporation tax. Personal landlords get them through the Section 24 lens.
- No Section 24 impact on cash flow. A geared personal BTL can produce a cash loss after Section 24 even while generating an accounting profit. Inside a company, the corporation tax bill is calculated on the actual profit after full interest deduction, which keeps tax and cash flow aligned.
The net effect for most higher-rate landlords with gearing above 60% is that the company route's higher mortgage rate is more than offset by the lower effective tax rate on profit. See our BTL limited company complete guide for the full mechanics.
Arrangement Fees and Total Cost of Credit
Arrangement fees on company BTL mortgages run 1-3% of the loan amount, typically higher than the 1-2% common on personal BTL. The fee can usually be added to the loan, which reduces day-one cash outlay but increases the effective rate over the deal period.
When comparing offers, the headline interest rate alone is misleading. The true cost of credit calculation should include:
- Interest rate over the fixed period
- Arrangement fee (whether paid upfront or added to loan)
- Valuation fee
- Lender legal fee
- Your own conveyancer's fee
- Broker fee (typically £500-£1,500)
- Procuration fee paid by lender to broker (typically not your direct cost, but worth knowing about)
- Early repayment charge schedule (matters if you might refinance or sell within the fixed period)
A lower headline rate with a 3% arrangement fee can be a worse deal than a higher headline rate with a 1% arrangement fee, depending on the loan size and fixed period. Always have your broker run the all-in cost calculation across multiple options before committing.
Transferring Existing Personal BTL into a Company
The existing personal mortgage typically needs to be redeemed and a new company BTL mortgage taken out. The company is a separate legal entity, so the personal mortgage cannot simply transfer to it. This creates several costs:
- Early repayment charges if the existing personal mortgage is still in a fixed period (typically 2-5% of the loan amount)
- New arrangement fees for the company mortgage (1-3%)
- Valuation, legal, and broker fees on the new application
- SDLT plus 3% surcharge on the transfer (the company is acquiring the property at market value)
- CGT on any gain since the original personal purchase (subject to incorporation relief under TCGA 1992 s.162 in qualifying cases)
The total transfer cost on a typical £200,000 property with a £150,000 mortgage and £50,000 of accumulated gain can run £20,000-£35,000. The maths only works when the projected long-term tax savings inside the company outweigh this upfront cost, typically requiring a multi-year hold post-transfer. Always model the specific numbers before committing.
Related reading: BTL limited company complete guide, Phased portfolio incorporation, Corporation tax vs income tax for landlords, Section 24 complete guide, and Multi-property landlord tax planning.