A five-year fixed rate can provide valuable certainty, but that certainty can become expensive if you intend to sell the property, refinance again or reorganise the portfolio before the fixed period ends. A tracker without early repayment charges takes the opposite trade: more freedom to exit, but no protection if the reference rate rises.
Landbay announced on 23 September that it had launched 11 additional tracker products across its Core, Premier, Small HMO and product-transfer ranges. It also reduced selected existing tracker margins by up to 0.15 percentage points.
The most useful details are structural. New Premier like-for-like and Premier like-for-like AVM two-year trackers at 75% LTV have no early repayment charges. Landbay says both use a stress rate of 4.5% or the pay rate for eligible landlords refinancing without further borrowing.
Tracker options have also been extended into the Premier Small HMO range, while other Core, product-transfer, Specialist Small HMO and Small MUFB trackers include no-ERC options. The exact margin, fee, valuation route and criteria vary across the range.
This is not an argument that every landlord should abandon fixed rates. It is a reminder that a BTL refinance has three separate tests: can the rent support the loan, what will the borrowing cost, and how expensive will it be to change course?
What Landbay Has Changed
Eleven new tracker products: additions across Core, Premier, Small HMO and product-transfer ranges.
Selected rate reductions: existing tracker margins reduced by up to 15 basis points.
No-ERC Premier options: new two-year 75% LTV like-for-like products with standard and AVM valuation routes.
Reduced affordability stress: 4.5% or pay rate on the selected Premier like-for-like products for eligible refinances without capital raising.
Specialist-property coverage: tracker additions and reductions across parts of the Small HMO and Small MUFB ranges.
Fixed, Tracker or No-ERC: What Are You Actually Buying?
A fixed mortgage buys payment certainty for a defined period. If the lender’s reference rates rise, the fixed payment does not change during that period. The usual price of that certainty is an early repayment charge if the loan is repaid before the fixed term ends.
A tracker normally follows Bank Rate or another stated reference rate plus a fixed lender margin. When the reference rate moves, the mortgage rate and payment can move too. The lender margin may remain unchanged, but the total rate is not fixed.
No ERC means the mortgage can normally be repaid during the relevant period without the product’s early repayment charge. It does not mean cost-free borrowing. Product fees, valuation costs, legal fees, administration charges or other costs may still apply, and a replacement mortgage will have its own price.
The right structure depends on what happens next. A landlord expecting to hold the property for ten years may value five-year certainty. A landlord planning a sale in 18 months could find a large ERC more important than a modest difference in the starting rate.
Start With the Exit Date
Before comparing headline rates, decide how likely you are to sell, refinance, repay capital or move the property within an SPV portfolio during the next two to five years. The likely exit date determines how much value to place on certainty and how dangerous an ERC could become.
Why the Stress Rate Can Matter More Than the Headline Rate
Buy-to-let lenders commonly test whether the rent covers a stressed amount of mortgage interest. This is usually expressed through an interest coverage ratio, or ICR. The lender may require the rent to equal 125%, 145% or another percentage of the stressed interest, depending on the borrower, ownership structure, product and property.
A lower stress rate can increase the theoretical loan supported by the same rent. That can determine whether a landlord refinances the full existing balance, has to inject cash or cannot proceed with that lender.
Take a property producing £36,000 of annual rent. At a 125% ICR and 4.5% stress rate, the simple theoretical loan calculation is £640,000. At the same ICR but a 5.5% stress rate, it falls to about £523,600. At 6%, it falls to £480,000.
The effect is also visible at a 145% ICR. The same £36,000 rent supports about £551,700 at 4.5%, around £451,400 at 5.5% and approximately £413,800 at 6%.
These are illustrations, not Landbay quotations. Real calculations can use monthly rent, product-specific stress rules, minimum stress floors, pay-rate comparisons, top slicing or other criteria. The final loan is also capped by LTV and full underwriting.
| Illustrative Stress Test | 125% ICR | 145% ICR |
|---|---|---|
| 4.5% stress rate | Approx. £640,000 | Approx. £551,700 |
| 5.5% stress rate | Approx. £523,600 | Approx. £451,400 |
| 6.0% stress rate | Approx. £480,000 | Approx. £413,800 |
The table assumes £36,000 annual rent and uses the simplified formula: annual rent divided by the ICR and stress rate. It demonstrates sensitivity only. A lender’s actual calculator and criteria determine the available loan.
Like-for-Like Is an Important Limitation
The announced 4.5% or pay-rate stress treatment is not a general permission to raise more capital against every rental property. Landbay describes it on selected Premier like-for-like 75% LTV products for borrowers refinancing without further borrowing.
Like-for-like normally means replacing the existing mortgage balance, with only limited additions where permitted for fees or associated costs. A landlord seeking £100,000 for another purchase, refurbishment or personal use may face different products and affordability rules.
This distinction matters when a landlord says, “the rent supports my refinance at 4.5%.” The correct question is whether the case meets the lender’s definition of like-for-like and every other condition attached to that stress treatment.
If the existing balance cannot be refinanced under alternative lender calculations, the selected Landbay route may deserve consideration. It is still one option in a wider market and should be compared with products whose rates, fees or criteria may produce a better overall outcome.
No ERC Can Be Valuable Even When the Rate Is Higher
Suppose a landlord expects to sell in 18 months. A five-year fixed mortgage may have a lower starting payment, but an ERC could apply when the property is sold. Depending on the charge and outstanding balance, that exit cost can outweigh the interest saved.
A no-ERC tracker can allow the landlord to sell or refinance without that product penalty. It can also preserve the ability to move onto a fix later if pricing becomes attractive, although there is no guarantee that future fixed rates will be lower or that the landlord will meet future criteria.
The flexibility may be valuable when a portfolio is being reorganised, a property has uncertain long-term suitability or an SPV intends to reduce leverage after another asset sale. It can also help when a landlord expects a substantial capital receipt and wants to repay debt early.
But flexibility should be priced. Calculate the expected interest and fees over the realistic holding period, add any ERC under the fixed alternative, and model what happens if the tracker rate rises. The decision should survive more than one interest-rate scenario.
The Variable-Rate Risk Is Real
A tracker can become more expensive quickly if its reference rate rises. Landlords should test whether the property and their wider cash flow could absorb increases of 0.5, 1 or 2 percentage points.
The impact is straightforward. On an interest-only balance of £500,000, each one-percentage-point rise adds approximately £5,000 a year, or about £417 a month, before tax. On £1m, the same movement is roughly £10,000 a year.
Rental income may not rise at the same speed, and landlords cannot assume every additional finance cost can be passed to tenants. Higher payments can reduce profit, weaken portfolio liquidity and make future affordability calculations more difficult.
A no-ERC feature allows the borrower to leave, but it does not guarantee an affordable replacement product will exist. The landlord may face new valuation, legal and product costs, and future lender criteria may be tighter.
Why Five-Year Fixes Can Still Be the Right Answer
A landlord who has no plan to sell or restructure may prefer to remove short-term rate uncertainty. A fixed payment makes it easier to forecast net cash flow, decide on maintenance budgets and assess whether the property remains commercially worthwhile.
Fixes can also receive different rental stress treatment from trackers at some lenders. In certain cases, a five-year fix may support more borrowing despite its ERCs. The result depends on the lender’s current calculation rather than a general rule that one product type is always more generous.
Certainty can be particularly valuable where the rental surplus is narrow, the borrower has several variable-rate properties or other portfolio costs are rising. The landlord should not choose a tracker merely because rates might fall.
The choice is asymmetric: a tracker borrower benefits if the reference rate falls but pays more if it rises. A fixed-rate borrower gives up that immediate benefit in return for a known payment and accepts the possible cost of leaving early.
Small HMOs and MUFBs Need More Than a Rate Comparison
Landbay’s changes include tracker options for Small HMOs and reductions across selected Specialist Small HMO and Small MUFB products. That widens the range for landlords whose properties do not fit a standard single-tenancy BTL mortgage.
HMO and MUFB underwriting can consider licensing, planning use, room or unit numbers, tenancy structure, property condition, valuation method and landlord experience. A lender may assess rent using actual tenancies, market rent or another supported figure.
The exit plan matters here too. A landlord expecting to change room configuration, refinance after works or sell the property as an investment may value flexibility. But specialist-property refinancing can take longer and cost more than a straightforward BTL switch, so the absence of an ERC is only one part of the decision.
The property should be checked against the full criteria before a valuation is instructed. A tracker being available for “small HMOs” does not mean every HMO, licensing position or construction type is acceptable.
Product Transfer or Remortgage?
Landbay has also expanded tracker options within its product-transfer range. Staying with the existing lender can reduce friction, particularly where there is no new borrowing or material change. It may avoid some valuation, legal or underwriting work, depending on the lender’s process.
Convenience is not proof of value. A landlord should compare the retention option with the wider market on rate, fee, stress test, available balance, ERC, property criteria and future flexibility. An external remortgage may offer a stronger structure even after costs; equally, a product transfer may be preferable if timing or underwriting risk is more important.
Do not wait until the current deal expires to make that comparison. A portfolio case, HMO or limited-company refinance can require additional documents, valuation work and legal coordination.
Three Tests for Every BTL Refinance
How Willow Private Finance Can Help
Willow can review a refinance through its buy-to-let mortgage service, including standard BTL, limited-company portfolios, HMOs and MUFBs.
We compare the loan supported by the rent, the total cost over the client’s expected holding period, variable-rate sensitivity, product-transfer options, ERC exposure and the ability to sell or restructure. That can reveal a different answer from simply choosing the lowest initial rate.
Landbay’s expanded tracker range may be relevant for some cases, particularly eligible like-for-like refinances and landlords who value no-ERC flexibility. Our role is to compare it with the wider lender market and explain the trade-offs before the client commits.
Refinancing a BTL Property but Unsure Whether to Fix?
We can compare the borrowing capacity, expected cost and exit flexibility of fixed, tracker and product-transfer options across the market.
The review should reflect how long you expect to keep the property, whether you may sell or restructure, and how much variable-rate risk the portfolio can absorb.
Request a Free BTL Refinance Review →Frequently Asked Questions
Key questions about BTL trackers, early repayment charges and rental-cover stress tests.
Is a BTL tracker mortgage cheaper than a fixed rate?
Not necessarily. A tracker can begin below or above a fixed rate and its payments can rise or fall when the reference rate changes. The comparison should include the initial rate, lender margin, product fees, valuation and legal costs, possible future rate movements, early repayment charges and the landlord’s likely holding period.
What does no ERC mean on a buy-to-let mortgage?
It means the lender does not impose an early repayment charge under the product terms when the loan is repaid early. Other costs may still apply, including product, valuation, legal, administration or exit fees. The mortgage conditions should also be checked for notice requirements and any separate restrictions.
How can a 4.5% stress test increase BTL borrowing capacity?
Many BTL lenders require the rent to cover stressed mortgage interest by a specified percentage. Holding the rent and ICR requirement constant, a lower stress rate produces a higher theoretical loan figure. Actual borrowing remains subject to the lender’s valuation, LTV, property, borrower and portfolio criteria.
Does Landbay’s 4.5% stress rate apply to every refinance?
No. The announced treatment applies to selected Premier like-for-like products at 75% LTV where the borrower is refinancing without additional borrowing. Landbay states that the stress rate is 4.5% or the pay rate, whichever applies under its criteria. Full eligibility and product terms must be checked.
Who might consider a no-ERC BTL tracker?
It may be relevant to a landlord who expects to sell, refinance, restructure a portfolio or repay debt during the tracker period and accepts variable-rate risk. A landlord prioritising payment certainty or unable to absorb higher payments may prefer a fixed rate despite the ERC commitment.