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 Mortgage Rate Structures for Buy-to-Let
Fixed-rate mortgages offer payment stability, while tracker rates, such as those newly offered by CHL, fluctuate with the Bank of England (BoE) base rate. For investors operating at 75% Loan-to-Value (LTV), understanding this difference is crucial for cash flow planning and risk management. As of December 2025, the Bank of England base rate stands at 4.75%, which forms the foundation of tracker mortgage calculations.
### Analysing Fixed vs. Tracker Rates
* **Fixed-Rate Buy-to-Let Mortgages (5.0-6.5%):** These mortgages lock in an interest rate for a specific term, typically 2 or 5 years. This provides predictability, making it easier to forecast rental profits and manage cash flow. For instance, a 5-year fixed rate at 5.5% on a £150,000 mortgage would result in consistent monthly interest payments of £687.50. This stability is particularly valuable when planning for Section 24 limitations on mortgage interest relief, as your underlying cost is known.
* **Tracker Rate Mortgages (BoE base rate plus a margin):** CHL's new tracker rates will typically follow the BoE base rate (currently 4.75%) plus a set margin. For example, a tracker rate of BoE + 1.0% would currently mean a pay rate of 5.75%. While potentially starting lower than some fixed rates, monthly payments can change if the BoE base rate moves, introducing payment volatility. This means a £150,000 mortgage at 5.75% would have initial interest payments of £718.75, but this figure could rise or fall.
* **Standard BTL Stress Test:** All BTL mortgages, including both fixed and tracker, are subject to a stress test. Lenders typically require rental income to cover 125% of the mortgage interest at a notional rate of 5.5%. This is the common interest rate coverage ratio (ICR) used to assess affordability. For example, if your interest payment at 5.5% is £687.50, your monthly rent would need to be at least £859.38 to pass the stress test, regardless of your actual pay rate.
* **Early Repayment Charges (ERCs):** Both product types can have ERCs if you repay the mortgage within a set period. Fixed rates almost always have them for the fixed term, while tracker mortgages may have a shorter ERC period or none at all, offering more flexibility for investors considering a remortgage or sale within a few years.
## Impact on Investor Cash Flow and Risk
Selecting between a fixed and tracker rate mortgage significantly influences investor cash flow and risk exposure. Fixed rates provide budgetary certainty, which can be beneficial for landlords managing multiple properties or those sensitive to monthly payment fluctuations. Tracker rates, conversely, can offer the benefit of lower initial payments if the base rate is low, but carry the risk of increased payments if the base rate rises. This risk must be carefully considered against the investor's wider portfolio and financial resilience.
## Investor Rule of Thumb
Choose payment predictability with fixed rates when cash flow stability is paramount, or accept interest rate volatility with trackers for potential initial savings if you have a higher risk tolerance and can absorb payment increases.
## What This Means For You
Investigating CHL's new tracker products requires a clear understanding of your personal risk appetite and your property's cash flow requirements. My experience shows that most investors don't lose money on variable rates, they lose money because they haven't planned for rate increases. If you want to refine your mortgage strategy and understand the true impact of different rate structures on your portfolio, this is exactly what we analyse inside Property Legacy Education.
### Navigating Mortgage Decisions for Better Returns
* **Predictable Cash Flow:** Fixed rates provide a stable platform for calculating your rental income after mortgage payments. This is crucial given that Section 24 makes mortgage interest a non-deductible expense for individual landlords, so predictable costs aid in accurate tax planning. For example, a £200,000 mortgage at a 5.0% fixed rate results in consistent interest payments of £833 per month, ensuring your budget remains stable.
* **Interest Rate Risk:** Tracker mortgages expose you to the risk of the Bank of England base rate increasing. Currently at 4.75%, any upward movement directly impacts your monthly outgoings. This can squeeze profit margins, especially on properties with tighter rental yields. As an example, if the base rate rises by 0.5%, a 5.75% tracker would become 6.25%, adding approximately £62.50 to the monthly interest payment on a £150,000 mortgage.
* **Flexibility vs. Cost:** Tracker rates sometimes come with lower or no early repayment charges, offering flexibility if you plan to sell or remortgage in the short term. However, this flexibility must be weighed against the potential for higher interest costs if rates climb significantly. Consider how long you intend to hold the property and your long-term investment strategy before committing to either product type.
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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