Top-Slicing and Let-to-Buy: Top-slicing allows some buy-to-let lenders to consider an applicant’s personal income when rent alone does not meet their affordability calculation.
Let-to-buy allows a homeowner to let their existing home while buying another residential property.
During a May 2022 Mortgage Solutions debate, brokers identified both areas as opportunities for lenders to offer broader and more practical criteria. Product availability and lender rules can change, so each case requires current research.
Why Top-Slicing and Let-to-Buy Mattered in 2022
Mortgage criteria determine whether a workable property plan becomes a completed transaction.
In 2022, a Mortgage Solutions panel considered where buy-to-let products could better reflect how landlords and homeowners use property in practice.
Two areas stood out: top-slicing and let-to-buy.
Both can help where a standard rental calculation does not fully represent the applicant’s financial position. However, they solve different problems and require different forms of evidence.
The discussion featured Liz Syms of Connect, Jeremy Duncombe of Accord Mortgages and Greg Cunnington of LDNFinance. It formed part of a four-part buy-to-let debate hosted by Mortgage Solutions.
Read the original Mortgage Solutions discussion about top-slicing and let-to-buy.
What Is Top-Slicing in Buy-to-Let?
Top-slicing is a form of buy-to-let affordability assessment.
A standard buy-to-let application is usually assessed mainly against the expected rental income. The lender applies its interest coverage ratio and stress rate to determine whether the rent supports the requested loan.
With top-slicing, the lender may also consider some of the applicant’s personal income when the rent falls below its required calculation.
This does not mean personal income replaces the rent. The lender will normally expect the property to produce a credible rental return. Personal surplus income may then support an identified shortfall.
What May a Lender Assess?
A top-slicing assessment may consider:
- expected monthly rental income;
- the requested mortgage balance;
- the lender’s stress rate;
- the required interest coverage ratio;
- earned or other accepted personal income;
- personal expenditure and existing commitments;
- income remaining after household costs;
- the applicant’s credit position;
- the wider property portfolio.
Each lender sets its own calculation. A case that works with one provider may not meet another provider’s criteria.
Advisers can review wider product considerations within the specialist buy-to-let mortgage guide.
Why Top-Slicing Created an Opportunity
During the 2022 discussion, the brokers noted that only part of the market offered a broad top-slicing approach.
This could restrict otherwise sustainable cases. For example, an applicant might have reliable personal earnings and sufficient disposable income, but the property rent could fall slightly below a lender’s stressed calculation.
A more detailed assessment could give lenders a clearer view of the full financial position.
The principle is simple: affordability should be based on reliable evidence rather than a single number. However, broader assessment must still be supported by responsible underwriting.
What Is Let-to-Buy?
Let-to-buy normally applies when a homeowner wants to move but retain their current home as a rental property.
The existing residential mortgage is usually replaced with a suitable buy-to-let mortgage. The applicant then arranges a residential mortgage for the new home.
The two applications are connected because the deposit, equity, rental income, personal affordability and completion dates may affect each other.
A let-to-buy arrangement should not be confused with a standard buy-to-let purchase. The applicant already owns the property that will become the rental.
How a Let-to-Buy Case May Work
A typical case may involve:
- valuing the existing home;
- obtaining an expected rental figure;
- calculating the available equity;
- assessing the proposed buy-to-let mortgage;
- reviewing affordability for the new residential mortgage;
- considering the deposit and purchase costs;
- Coordinating both applications and completion dates.
The residential lender may also consider whether the retained property is financially self-supporting.
Advisers can use Connect’s wider buy-to-let mortgage guide when discussing deposits, rental calculations and landlord costs.
Mortgage Solutions
Syms proposed that clients could secure an exit without incurring bridge loan expenses if a lender introduced a product featuring retention. Moreover, she emphasised the availability of developer financing for modern construction methods (MMC). Despite this, she lamented the absence of a corresponding presence in the mainstream mortgage sector, even as the green agenda grows in significance.
Greg Cunnington, Chief Operating Officer at LDNFinance, acknowledged Accord’s improvement in its interest coverage ratio, which has enhanced affordability. While recognising the effectiveness of top-slicing by Clydesdale and Barclays, Cunnington stressed the need for more lenders to adopt a pure top-slicing model.
He suggested that lenders could differentiate themselves by offering unique products. For example, let-to-buy for those seeking a chain-free experience, with the added incentive of a stamp duty refund if the property is sold within three years.
This discussion marks the first instalment of a four-part buy-to-let debate series. Notable panellists include Jeremy Duncombe, Managing Director at Accord Mortgages, Liz Syms, owner of Connect Mortgages and Connect for Intermediaries, and Greg Cunnington, Chief Operating Officer at LDNFinance.
The series, hosted by Victoria Hartley, Group Editor at Mortgage Solutions, aims to provide insights into the evolving buy-to-let market. The second part is scheduled for broadcast on Wednesday, May 25th.
Why Let-to-Buy Was Seen as an Underused Area
The panel identified let-to-buy as a possible route for homeowners seeking greater control over their move.
It may reduce the need to sell the existing home before buying another property. It can also allow the owner to retain a property with long-term rental potential.
However, it creates two financial commitments rather than one. The applicant must consider:
- mortgage payments;
- periods without a tenant;
- repairs and maintenance;
- letting costs;
- insurance;
- taxation;
- purchase costs;
- the higher rates of Stamp Duty Land Tax that may initially apply.
Tax treatment depends on individual circumstances and may change. Applicants should seek suitable tax advice.
Top-Slicing and Let-to-Buy Are Not the Same
Top-slicing is an affordability method used within some buy-to-let assessments.
Let-to-buy is a property and mortgage arrangement involving an existing home and a new residential purchase.
Top-slicing may sometimes form part of a let-to-buy assessment, but neither automatically depends on the other.
This distinction is important. Clear definitions help advisers select the right lender research route and explain the case accurately.
The Practical Role of a Mortgage Adviser
These cases can involve several connected calculations. An adviser may need to compare:
- lender rental stress tests;
- personal income rules;
- acceptable evidence;
- maximum loan-to-value limits;
- property eligibility;
- portfolio landlord criteria;
- residential affordability;
- completion timescales.
Applicants looking for advice can search the buy-to-let mortgage adviser directory.
Connect Experts is an adviser directory and matching platform. It does not provide mortgage advice directly. Advice is provided by the adviser or firm selected by the customer.
What the 2022 Debate Showed
The 2022 debate highlighted a wider truth about specialist lending.
A product is useful only when its criteria recognise the facts of the case. Top-slicing can account for reliable surplus income. Let-to-buy can reflect a homeowner’s decision to retain one property while moving to another.
Neither route removes risk. Their value comes from assessing that risk with greater detail.
For mortgage advisers, access to lender knowledge, placement support and specialist experience can make complex cases easier to assess. Brokers considering their network options can explore joining Connect Network.
Frequently Asked Questions
Is top-slicing available from every buy-to-let lender?
No. Availability and assessment methods vary between lenders. Criteria may also change over time.
Does a high personal income guarantee a top-slicing mortgage?
No. The lender will consider expenditure, existing commitments, rental income, credit history and its own affordability rules.
Is let-to-buy the same as consent to let?
No. Consent to let normally allows a homeowner to rent a property temporarily while retaining the existing residential mortgage. Let-to-buy usually involves arranging a buy-to-let mortgage on the former home while purchasing another residential property.
Can top-slicing be used for a let-to-buy application?
Potentially. It depends on whether the selected buy-to-let lender offers top-slicing and whether the applicant meets its criteria.
Are all buy-to-let mortgages regulated by the FCA?
No. Some buy-to-let arrangements fall outside FCA mortgage regulation. Consumer buy-to-let and other circumstances may receive different regulatory treatment. An adviser should establish the correct classification for the case.
This article records an intermediary market discussion published in May 2022. It should not be treated as confirmation of current lender products or criteria. Lender requirements and product availability can change.
This site is intended for use by intermediaries only.
Connect for Intermediaries is a trading style of Connect IFA Ltd, which is authorised and regulated by the Financial Conduct Authority and is entered on the Financial Services Register under reference 441505. The FCA does not regulate all products we offer.