Stamp Duty CalculatorBuy-to-Let Mortgage Costs
Full UK 2026 cost breakdown for BTL mortgages — rates, fees, rental cover, stress tests, and ongoing carrying costs.
Buy-to-let mortgages cost materially more than residential mortgages at the same loan amount — higher rates, higher product fees, additional rental-cover constraints, and typically interest-only structure that leaves capital intact. This guide walks through the complete BTL mortgage cost picture for UK landlords in 2026, including the rental-cover and stress-test rules that determine maximum loan, and the ongoing carrying costs that often catch first-time landlords by surprise.
How BTL mortgages differ from residential
| Feature | Residential | Buy-to-let |
|---|---|---|
| Typical min deposit | 5% | 25% |
| Best-rate LTV | 60-75% | 60% |
| Repayment structure | Mostly capital + interest | Mostly interest-only |
| Affordability test | Personal income LTI + DTI | Rental cover (ICR) |
| Typical rate at 60% LTV (5-yr fix) | 4.5-5.0% | 5.0-5.5% |
| Typical product fee | £0-£1,500 | £1,500-£3,000 |
| Regulator | FCA (consumer protection) | FCA (most BTL non-regulated; consumer BTL regulated) |
BTL mortgage rates 2026 — by LTV band
Mid-2026 typical UK BTL rates from mainstream lenders:
- 60% LTV, 5-year fix: 5.0–5.4%
- 60% LTV, 2-year fix: 5.2–5.6%
- 75% LTV, 5-year fix: 5.5–6.0%
- 75% LTV, 2-year fix: 5.6–6.2%
- 80% LTV (specialist): 6.5–7.5%
- Limited company BTL: Add 0.3–0.5 percentage points to the above
The rate gap between BTL and residential reflects the regulatory capital treatment plus risk pricing. For comparison, use the mortgage repayment calculator to model BTL monthly costs at your specific loan and rate.
Product fees — the hidden BTL cost
BTL product fees are materially higher than residential and structured differently. Common BTL fee structures:
- Flat fee £1,500–£3,000. Standard. Often charged for higher-LTV products.
- Percentage fee 1.5–3% of loan. Common on the lowest-rate BTL products. On a £200,000 loan, 2% = £4,000.
- Free product fee. Available at higher rates. Often the best total cost if you're holding for 2-3 years rather than 5+.
Calculate total cost over the fixed period (rate + fee) rather than headline rate alone. A 5.0% rate with £3,000 fee costs more over 5 years than a 5.3% rate with no fee, on most loan sizes.
The rental cover (ICR) test
The single biggest constraint on BTL borrowing. Lenders apply an Interest Coverage Ratio (ICR) test: monthly rent must cover monthly mortgage interest at a stress rate, by a specified multiple.
Typical 2026 ICR requirements:
- Basic-rate taxpayer: 125% rental cover at 5.5% stress rate (some lenders 145%)
- Higher-rate taxpayer: 145% rental cover at 5.5% stress rate (some lenders 165%)
- Limited company: 125% rental cover at 5.5% stress rate
Worked example: £200,000 BTL purchase, basic-rate taxpayer, £950 monthly rent.
- Annual rent: £11,400
- 125% ICR coverage requires annual interest cost ≤ £11,400 / 1.25 = £9,120
- At 5.5% stress, max loan = £9,120 / 0.055 = £165,818
- Max loan at 145% ICR (some lenders): £9,120 / 1.45 × (1/0.055) = £142,945
If you need more than this, you must increase the deposit, find a lender with looser ICR rules, or secure a higher-rent property.
Stress testing — the other constraint
Beyond the rental cover test, BTL lenders also stress-test the implied monthly payment against a higher rate. The methodology mirrors residential — see the mortgage stress test explained guide for the underlying logic. BTL stress rates are typically:
- 2-year fix: Stressed at SVR+1% or 7-8% flat (most BTL lenders)
- 5-year fix: Softer test, often pay rate + 1%
- Interest-only: Stress on the IO payment, plus check that the repayment vehicle (sale or refinance) is realistic
Use the stress test calculator to see what your BTL monthly looks like at +1%, +2%, +3% from your pay rate.
Personal income floors
Most BTL lenders require minimum personal income of £25,000–£30,000 — separate from the rental cover test. The reasoning: rental income can be interrupted; the lender wants confidence you could cover void periods or shortfalls.
Variations:
- Standard mainstream BTL: £25,000+ personal income
- Specialist higher-LTV BTL: Often £35,000+ personal income
- Portfolio landlords (4+ properties): Some lenders waive the floor based on overall portfolio cash flow
- Limited company BTL: Personal income still typically required of the company director-applicants
Interest-only vs repayment for BTL
The default BTL structure is interest-only:
- Interest-only. Monthly payment = loan × annual rate / 12. Capital remains unchanged. Capital is repaid at end of term (sell the property, refinance, or repay from other capital).
- Repayment (capital + interest). Loan reduces over the term. Higher monthly cost; lower lifetime interest. Less common for BTL because it reduces in-period cash flow.
Most landlords prefer interest-only for cash flow. Read the repayment vs interest-only guide for the mechanics and the trade-off in detail.
Limited company (SPV) BTL
A growing share of BTL purchases in 2026 are made through limited companies (SPVs). Key cost considerations:
- Higher mortgage rates: +0.3–0.5 percentage points vs personal-name BTL
- Higher product fees: often £2,500–£4,000
- Company setup costs: £100–£300 to incorporate, ongoing accountancy ~£600–£1,200/year
- Personal guarantee usually required: Lender wants recourse to the director personally
- SDLT treatment: Same surcharge as personal BTL; potential ATED exposure above £500k (usually exempted via property rental business relief)
Limited company BTL makes sense for higher-rate taxpayers retaining rental profits inside the company; less compelling for basic-rate taxpayers where personal name is often simpler and cheaper.
Total cost example — £200,000 BTL purchase
Personal-name BTL, £200,000 purchase, 25% deposit (£50,000), £150,000 mortgage at 5.5% over 25-year term, interest-only:
| Item | Amount |
|---|---|
| Property purchase price | £200,000 |
| Deposit (25%) | £50,000 |
| Mortgage loan | £150,000 |
| SDLT (5% additional-property surcharge stacked) | £11,500 |
| BTL mortgage product fee | £2,000 |
| Mortgage valuation | £400 |
| BTL conveyancing | £1,800 |
| Survey | £500 |
| Other disbursements | £600 |
| Working capital reserve | £3,500 |
| Total upfront cash | £70,300 |
| Monthly interest-only payment at 5.5% | £688 |
| Annual mortgage interest cost | £8,250 |
Ongoing carrying costs
Beyond the mortgage, ongoing landlord costs include:
- Buildings insurance (landlord cover): £300–£500/year (higher than owner-occupied)
- Letting agent fees: Full management 10–12% of rent; tenant-find only 8–10% of first month's rent
- Maintenance: 1–2% of property value per year as a rule of thumb
- Mortgage broker fees on remortgage: £300–£600 per remortgage event
- Annual gas safety certificate: £80–£120
- EICR (Electrical Installation Condition Report): £150–£250 every 5 years
- Tax on rental profits: Income tax on net profit (after mortgage interest tax credit at basic rate); CGT on eventual sale
The relationship between LTV and BTL rate pricing
BTL lenders price by LTV band, and the spread between bands has widened in 2026. The current shape of the market: 60% LTV products are typically 75-90 bps cheaper than 80% LTV products, and lenders reserve their sharpest pricing for sub-60% LTV deals. The effect on monthly cash flow is large enough to materially change yield calculations on lower-yielding stock.
How BTL portfolio size affects mortgage cost
Lenders distinguish between "consumer landlords" (3 or fewer mortgaged BTL properties) and "portfolio landlords" (4 or more). Portfolio landlord status triggers additional underwriting requirements under PRA rules — a portfolio cashflow review, asset and liability statement, business plan, and stress testing across the entire portfolio rather than just the new property. This usually adds 2-4 weeks to the application timeline and may push the borrower toward specialist lenders with higher headline rates but more flexible portfolio-friendly criteria.
Limited company vs personal BTL mortgage cost comparison
The choice between personal name BTL and limited company (SPV) BTL has shifted firmly toward SPV ownership since the 2017 Section 24 changes that restricted mortgage interest tax relief for personal landlords. But the SPV route comes with materially higher mortgage costs:
| Cost line | Personal BTL | SPV BTL |
|---|---|---|
| Headline rate (60% LTV 5yr fix) | ~5.2% | ~5.6% |
| Product fee | £1,500-£2,000 | £3,000-£5,000 |
| Annual accountancy | £0 (in self-assessment) | £600-£1,200 |
| Annual confirmation statement | £0 | £34 |
| ICR test | 125-165% (income-dependent) | 125% flat |
The trade-off: SPVs have higher mortgage costs but lower effective tax on rental profits (because mortgage interest is fully deductible against profit, unlike for personal higher-rate landlords). For most landlords with 3+ properties and higher-rate personal income tax exposure, the SPV route still wins in net terms.
Frequently asked questions
How much does a buy-to-let mortgage cost in 2026?
BTL mortgage rates in 2026 typically run 0.5-1.0 percentage points higher than equivalent residential rates. At 60% LTV, 5-year fixes are around 5.0-5.5% in 2026. Product fees are higher too — £1,500-£3,000 is typical.
What's the rental cover test?
BTL lenders apply an Interest Coverage Ratio (ICR) test: monthly rent must cover the mortgage interest at a stress rate (typically 5.5% or higher in 2026) by a multiple of 125-145% for basic-rate taxpayers, or 145-165% for higher-rate taxpayers.
Are BTL mortgages interest-only?
Most BTL mortgages are interest-only by default. Landlords typically use interest-only to maximise cash flow during ownership; the capital is repaid by selling the property at the end of the mortgage term, or by refinancing indefinitely.
What product fees do BTL mortgages have?
BTL product fees are typically £1,500-£3,000 — significantly higher than residential. Some BTL products charge a percentage fee (e.g. 2% of loan) rather than a flat fee.
Can a first-time buyer get a BTL mortgage?
Yes but it's restricted. Most BTL lenders require applicants to already own a residential property. A handful of specialist lenders accept FTB BTL, typically with higher deposits (35%+) and additional underwriting scrutiny.
Do I need to be a higher earner for BTL?
Most BTL lenders require minimum personal income of £25,000-£30,000. The rental cover test does most of the affordability work, but the personal income floor is a separate underwriting check.
What's portfolio BTL underwriting?
Landlords with 4+ BTL properties are 'portfolio landlords' under PRA rules and face additional underwriting on each new application — review of the whole portfolio's cash flow, individual property profitability, and overall LTV.
What about limited company BTL?
Limited company BTL (SPV) mortgages are a growing market segment. Rates are typically 0.3-0.5 percentage points higher than personal-name BTL, but the tax treatment of rental income is often better for higher-rate taxpayers.
Related guides
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Sources
Last reviewed: 25 May 2026.