Whether you are buying your first rental property, reviewing an expiring deal or planning your next portfolio purchase, the right mortgage depends on the rent, property, ownership structure and your wider circumstances.
Quick answer
A buy-to-let mortgage is borrowing secured on a property that is intended to be rented to tenants. Lenders normally assess the expected market rent as well as the applicant, property, deposit or equity and proposed tenancy. Their affordability calculation is an underwriting test; it is different from the contractual mortgage payment and does not show whether the property will produce a profit.
Buy-to-let applications may be made personally or through a limited company. First-time landlords, portfolio landlords, houses in multiple occupation and applicants changing how an existing property is used can face different criteria. The correct route should be identified before a valuation fee, legal cost or product fee is committed.
Count Ready can help you understand the mortgage route, the information a lender is likely to request and the costs that should be compared. Tax, legal and investment decisions need suitably qualified advice in addition to mortgage advice.
Who Count Ready can help
A useful enquiry explains what you are trying to do. That helps separate a standard rental purchase from a remortgage, company application or specialist property case.
This may include a first rental purchase or another property for an established landlord. A first-time landlord is not automatically a first-time buyer: previous home ownership and current residential borrowing can affect both mortgage and tax questions.
If a deal is ending, compare the existing lender’s product-transfer options with a remortgage. A lender switch, additional borrowing or equity release may involve new underwriting, valuation, legal work and early repayment charges.
Portfolio applications can require a property schedule, mortgage balances, rents, costs, ownership details and evidence of the landlord’s wider position. The whole portfolio may be reviewed even when only one property is being financed.
The applicant, company structure, directors, shareholders, property and proposed guarantees can all matter. Company ownership is not automatically the cheapest or most tax-efficient option.
HMOs, student lets, holiday lets and multi-unit property can have different valuation, licensing, management and lender requirements. Describe the actual occupancy and property configuration at the outset.
Personal income, employment type, credit history, existing commitments and the reason for any previous credit problem may influence the available route. They should be assessed alongside the rent and property.
Affordability
There is no single borrowing multiple or rental-cover percentage that applies to every buy-to-let case. The result depends on the lender’s current policy and the facts of the application.
Mortgage choices and costs
A low headline rate can be poor value after fees, and a lower monthly payment can leave more capital to repay later.
| Decision | What it means | What to check |
|---|---|---|
| Interest-only | Monthly payments cover interest, while the original capital normally remains outstanding. | The repayment plan for the capital, overpayment rules and what happens at the end of the term. |
| Capital repayment | Each payment normally includes interest and part of the amount borrowed. | The higher monthly commitment, term, affordability and how quickly the balance reduces. |
| Fixed rate | The interest rate is fixed for an agreed product period. | Product fee, fixed period, revert rate, portability and any early repayment charge. |
| Variable or tracker rate | The rate and payment can change in line with the product terms. | How changes are calculated, any floor or collar, fees and early repayment terms. |
| Product transfer | A new deal with the existing lender, usually without changing the mortgage provider. | Whether additional borrowing is needed and how the total cost compares with remortgaging. |
| Remortgage | A replacement mortgage, usually with new underwriting and possibly a new lender. | Valuation, legal work, arrangement fees, early repayment charges, timing and the total cost over the comparison period. |
Choose the correct route
Explain how the property will be used and who will live there. The name of a product alone is not enough to establish the correct route or regulatory treatment.
You let your existing home and buy another home to live in. This normally involves coordinating two mortgages and the deposit or equity for the onward purchase.
You ask the existing residential lender for permission to rent the property, often for a limited period. Consent is not automatic and does not replace the need to follow the mortgage terms.
Short-stay occupation and seasonal income are different from a standard assured tenancy. Lender, planning, insurance and tax treatment can differ.
Multiple occupants, shared facilities and local licensing can require specialist underwriting. Check the council’s rules and the lender’s proposed-tenancy criteria.
A shop with a flat, purpose-built block or property operated as a business may sit outside a standard residential buy-to-let route.
A property that is not immediately lettable may not fit a standard buy-to-let lender. Short-term finance may be considered only with a credible and costed exit plan.
Advice and application process
The sequence can vary, but a well-prepared case should establish the purpose and constraints before an application is submitted.
Prepare before applying
You do not need to upload sensitive financial records through a general website enquiry. Start with the outline of the case; Count Ready can explain what is required and how to provide it securely.
Company and portfolio cases usually require extra information, and the precise list depends on the lender and transaction.
Costs, responsibilities and risk
A mortgage affordability calculation is only one part of a landlord’s decision. Your actual cash flow depends on the mortgage and the costs of owning, letting and maintaining the property.
Variable payments can rise. A fixed deal ends even though the mortgage continues. With interest-only borrowing, the capital normally remains due at the end of the term and needs a credible repayment plan.
Rents and property values can fall as well as rise. A change of tenant, property condition, licensing rule or letting model may affect both the mortgage and the property’s running costs.
Make an informed enquiry
For an initial review, provide the mortgage purpose, ownership structure, property value or purchase price, borrowing required, expected rent, existing mortgage details, portfolio size and any relevant deadline.
Count Ready will confirm any broker fee and when it becomes payable before chargeable work begins. Lender, valuation, legal and product fees may also apply.
Count Ready Limited is registered in England and Wales, company number 10283205. Its current website disclosure states that it is an Appointed Representative of Connect IFA Limited, FRN 441505, and appears on the Financial Services Register under FRN 976111.
Check the Financial Services Register
The Register should be checked for current status and the activities covered. Some forms of business buy-to-let and commercial mortgage lending are not regulated by the FCA.
Sources and boundaries
These sources were checked on 21 September 2026. Lender criteria and legal or tax rules can change, so the relevant source should be checked again when advice is given.
For the distinction between business buy-to-let, consumer buy-to-let and regulated mortgage arrangements.
For rental affordability, stress assessment and portfolio-underwriting principles. The page distinguishes the current version from future guidance.
For the treatment of finance costs and the distinction between individual and company landlords. Obtain tax advice for your circumstances.
For the difference between paying interest each month and repaying the mortgage capital at the end.
For additional residential property in England and Northern Ireland. Scotland uses LBTT and Wales uses LTT.
For additional residential property in Scotland.
For additional residential property in Wales.
For the current minimum standard covering relevant private rented property in England and Wales.
Frequently asked questions
There is no universal deposit. The required equity depends on the lender’s maximum loan-to-value, the property, ownership structure, applicant and product. A larger deposit can reduce the loan-to-value and may widen the available choice, but it does not guarantee acceptance.
Lenders commonly assess expected market rent using their own interest-cover and stress assumptions. They may also consider personal income, credit, commitments, landlord experience, the property and the proposed tenancy. The lender’s calculation is not the same as your monthly mortgage payment or your actual cash flow.
Some lenders set a personal-income requirement and others assess cases differently. Income can also matter where the rent does not meet the required calculation or the applicant has other commitments. Count Ready should check current lender criteria for the actual case rather than applying one figure to everyone.
Some lenders consider first-time buyers or first-time landlords, while others apply restrictions. The applicant still needs to meet the lender’s rental, deposit, income, credit and property requirements. First-time buyer status can also mean something different for property-tax purposes, so legal or tax advice may be needed.
No. A product transfer normally means taking a new deal with the existing lender. A remortgage replaces the mortgage, often with another lender, and can involve underwriting, valuation and legal work. Compare the total cost, available borrowing and timing rather than the interest rate alone.
No. Mortgage pricing, lender choice, company administration, personal guarantees, tax and the cost of moving property into a company can all matter. A mortgage adviser can explain lender options, while an accountant or tax adviser should assess the ownership and tax consequences.
No. Many mortgages taken wholly for a landlord’s business purposes are outside standard FCA mortgage regulation. Consumer buy-to-let and arrangements involving occupation by the borrower or close family can be treated differently. The facts should be checked before the mortgage route and protections are described.
If you wish to move into your buy-to-let property, you would need to convert your mortgage from a buy-to-let to a residential one, as these mortgages have different terms and conditions. It’s essential to inform your lender about this change, as living in a property with a buy-to-let mortgage could breach the terms of your mortgage agreement.
While you can rent your buy-to-let property to a family member, it may be classified as a “consumer buy-to-let” mortgage. It’s essential to check with your lender as not all offer this type of mortgage.
While SIPPs allow investment in a wide range of assets, residential property is not typically included. However, commercial property can usually be bought through a SIPP.
Early repayment charges apply if you pay off all or part of your mortgage before the end of the agreed term or switch to another lender. The charges are typically a percentage of the loan and can vary based on the terms of your mortgage agreement.
Some terms of a mortgage can be negotiated, such as the interest rate or fees, especially if you have a strong credit rating. However, other terms, like loan-to-value ratios or early repayment charges, may be less flexible.
While it’s possible, it may be more challenging. Lenders may be hesitant if the property is deemed uninhabitable or requires substantial work before it can be let out.
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