How do CHL's new tracker rates compare to fixed-rate buy-to-let mortgages at 75% LTV?
Quick Answer
CHL's new tracker rates at 75% LTV will likely offer variable payments tied to the Bank of England base rate, contrasting with the payment stability provided by fixed-rate BTL mortgages. While initial tracker rates might be lower, fixed rates mitigate interest rate volatility.
## Understanding Tracker vs. Fixed Buy-to-Let Mortgage Rates
Comparing CHL's (or any lender's) new tracker rates against fixed-rate buy-to-let mortgages at 75% LTV primarily involves assessing risk and stability in a fluctuating interest rate environment. Tracker mortgages typically follow a benchmark, such as the Bank of England base rate, which currently stands at 3.75% as of August 2026. This means that if the base rate increases, your mortgage payments will rise, and conversely, they will fall if the base rate decreases. Fixed-rate mortgages, however, lock in an interest rate for a predetermined period, offering predictable monthly payments regardless of base rate movements.
For a buy-to-let investor, the choice between a tracker and a fixed rate at 75% LTV depends heavily on their risk tolerance, cash flow management, and market outlook. A tracker might appeal if the investor believes interest rates will remain stable or decrease, offering potentially lower initial payments. A fixed rate offers certainty, which can be invaluable for budgeting and stress-testing property cash flow, especially with Section 24 impacting deductibility of finance costs for individual landlords.
### What are the typical characteristics of BTL trackers?
Tracker mortgages for buy-to-let properties are tied to an external benchmark, commonly the Bank of England base rate, plus a set margin. For example, a tracker might be advertised as 'Base Rate + 1.5%'. With the current base rate at 3.75%, this would result in an initial pay rate of 5.25%. The primary characteristic is that the interest rate, and therefore the monthly repayment, can change throughout the mortgage term in line with the benchmark. This provides flexibility but exposes the borrower to interest rate volatility.
Lenders often apply an Interest Cover Ratio (ICR) stress test to ensure the property's rental income can cover potential payment increases. While a common conservative example is 125% rental coverage at a 5.5% notional pay rate, many lenders use 140% or higher reference rates, particularly for higher-rate taxpayers or for tracker products, to account for potential rate rises. This can sometimes make qualifying for a tracker more challenging if the rental income is only just meeting the stress test criteria at current rates.
### How do fixed-rate BTL mortgages offer stability?
Fixed-rate buy-to-let mortgages provide a consistent interest rate for a specific term, typically two, three, or five years. This stability allows investors to accurately forecast their monthly outgoings, making budgeting simpler and providing reassurance against interest rate fluctuations. For a property generating £1,200 per month in rent, a fixed rate ensures the mortgage payment component remains constant, simplifying profit calculations.
While typical BTL fixes vary by lender and product, always compare the latest rates. For example, if a 5-year fixed rate at 75% LTV is 5.8%, an investor knows their mortgage payment will remain constant for that period. This certainty is crucial for landlords, especially with the Renters' Rights Act 2025 abolishing Section 21 evictions from 1 May 2026, meaning tenancy stability is even more important for consistent rental income.
### What is the impact on Interest Cover Ratio (ICR) stress tests?
The Interest Cover Ratio (ICR) stress test is a critical factor for buy-to-let mortgages. Lenders use it to determine if a property's rental income can sufficiently cover the mortgage interest payments, typically at a higher notional rate than the actual pay rate. For example, a lender might test a fixed-rate product at 125% coverage on a 5.5% notional rate, or 145% on a 7% notional rate for higher-rate taxpayers, even if the actual pay rate is lower.
For tracker mortgages, lenders often apply an even higher stress rate to account for potential increases in the Bank of England base rate. This can mean that a property that comfortably passes the ICR for a fixed product might fail for a tracker, or require a larger deposit to reduce the loan amount. Investors should check specific lender criteria, as ICR thresholds and notional rates vary significantly, impacting how much they can borrow on either a fixed or tracker product at 75% LTV.
## Potential Downsides of Tracker Rates
* **Interest Rate Volatility:** Your mortgage payments can increase significantly if the Bank of England base rate rises, directly impacting your cash flow and potential rental profit.
* **Budgeting Uncertainty:** It becomes harder to accurately predict monthly outgoings and profit margins over the medium to long term, complicating financial planning for your portfolio.
* **Stress Test Rigour:** Lenders often apply higher stress test rates to tracker mortgages, potentially reducing the maximum loan amount available, especially for a 75% LTV product.
## Investor Rule of Thumb
Assess your risk appetite and the stability of your rental income; if payment predictability is paramount for your investment strategy, a fixed-rate mortgage generally offers more security than a tracker.
## What This Means For You
Navigating the choice between tracker and fixed-rate buy-to-let mortgages requires a thorough understanding of current market conditions and your personal investment goals. Most landlords don't get into financial trouble because they choose the 'wrong' rate, but because they don't understand the implications for their cash flow and stress tests. If you want to understand how different mortgage products impact your specific deal analysis and long-term portfolio strategy, this is exactly what we analyse inside Property Legacy Education.
Steven's Take
The introduction of new tracker rate products by lenders like CHL offers investors more choice, but it also means a deeper analysis of risk versus reward. While tracker rates might appear attractive with slightly lower initial pay rates compared to fixed products, the current 4.75% Bank of England base rate could still move. For investors, it comes down to balancing the desire for potential lower initial payments against the security of knowing your outgoings are locked in. Most mainstream BTL mortgages will still apply the 125% rental coverage at 5.5% notional rate stress test, so the actual 'pay rate' doesn't alter the rental income requirement. It's about personal appetite for interest rate movement.
What You Can Do Next
1. Review bankofengland.co.uk for the current and historical base rate to understand potential volatility.
2. Contact a specialist BTL mortgage broker or use an online comparison tool to compare current fixed and tracker rates from multiple lenders, including CHL, for your specific LTV.
3. Calculate your monthly cash flow under different scenarios (e.g., base rate increases by 0.5% or 1%) if considering a tracker mortgage. Use an online mortgage calculator to estimate payments.
4. Assess your personal risk tolerance and investment strategy. Fixed rates suit those prioritising stability, while trackers might suit those comfortable with variable costs and active market monitoring.
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