⚡ Quick Answer
The best buy-to-let mortgage rates start from 4.27% (2yr fixed) as of June 2025. You typically need a 25% deposit and your rental income must cover 125–145% of the mortgage payment. Calculate your BTL payments →
Best Buy-to-Let Mortgage Rates (June 2025)
| Lender | Type | Rate | Max LTV | Min Rental Cover | Fees |
|---|---|---|---|---|---|
| The Mortgage Works | 2yr Fixed | 4.20% | 75% | 125% | £1,995 |
| Barclays | 2yr Fixed | 4.33% | 75% | 125% | £0 |
| BM Solutions | 5yr Fixed | 4.54% | 75% | 125% | £995 |
| Santander | 2yr Fixed | 4.53% | 75% | 145% | £1,499 |
| Virgin Money | 5yr Fixed | 4.62% | 75% | 125% | £0 |
BTL Mortgage Eligibility
- Deposit: Minimum 25% (75% LTV); best rates from 35%+
- Income: Most lenders require £25,000+ personal income
- Age: Typically 21–75 (some lenders to 85 at end of term)
- Credit: Clean credit history preferred; specialist lenders for adverse credit
- Property: Must be habitable and lettable; some restrictions on HMOs
Expert Tip — BTL Tax Rules
Since April 2020, landlords can no longer deduct mortgage interest from rental income before paying tax. Instead, you get a 20% tax credit. Higher-rate taxpayers are most affected. See the HMRC rental income guide ↗ and consider speaking to a tax adviser.
Rental Yield & Interest Cover Ratio (ICR)
Most BTL lenders require your rental income to cover 125–145% of the monthly interest payment (the Interest Cover Ratio). Example:
- Mortgage: £200,000 at 4.5% interest only = £750/month interest
- Required rent at 125% ICR: £750 × 1.25 = £937/month minimum
- At 145% ICR: £750 × 1.45 = £1,088/month minimum
Gross rental yield = (Annual rent ÷ Property value) × 100. A yield of 5–8% is considered good for UK buy-to-let. See Which? BTL guide ↗.
Pros & Cons of Buy-to-Let
✅ Pros
- Rental income provides regular cash flow
- Capital growth over long term
- Can use equity to build a portfolio
- Interest-only mortgages reduce monthly costs
⚠️ Cons
- Higher rates and fees than residential
- Stamp duty surcharge (3% extra)
- Tax rules less favourable since 2020
- Void periods reduce returns
Frequently Asked Questions
- Loan-to-value bands (95/90/85/80/75%) drive pricing — a small extra deposit can cross a cheaper band
- Start remortgage shopping up to 6 months before your fix ends — you can lock now and switch if rates fall
- Whole-of-market brokers see deals comparison sites don't carry, especially for non-standard income
What Actually Moves the Needle
Product fees deserve as much attention as rates. A £999 arrangement fee on a lower rate only pays off above a certain loan size — roughly £130,000+ for typical gaps. Below that, fee-free wins despite the higher headline rate.
New-build purchases carry extra moving parts: developer deadlines (often 28 days to exchange), incentives that lenders may deduct from the valuation, and longer mortgage-offer validity requirements. Use a broker experienced with new-build timescales.
Affordability rules changed materially after the 2022–23 rate cycle. Lenders now stress-test your payments at a notional higher rate, and regular commitments — car finance, childcare, even subscriptions — reduce the maximum loan. Clearing a £300/month car payment can add £15–20k to a mortgage offer.
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