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BTL UK Portfolio Mortgages

What is the difference between a normal buy to let mortgage and a buy-to-let portfolio mortgage? Discover all you need to know about the variances between individual and buy to let portfolio mortgage products.

Almas Uddin
Almas Uddin

Founder and Mortgage Advisor

Almas Uddin2024-06-14
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BTL UK Portfolio Mortgages

Many UK landlords are looking at expanding their property portfolios to take advantage of low purchase prices. Many more are set to join the 2.5 million investors and landlords across the UK sector.

Let's look at buy-to-let portfolio mortgages for property portfolios, how they work, who can apply for them, and which lenders are offering special mortgage rates for multiple investment properties!

If you need support with securing a BTL portfolio mortgage, or are considering expanding your portfolio and wish to explore the best buy-to-let portfolio mortgage options out there, get in touch with business finance broker today.

We work with investors and landlords to secure the most advantageous buy-to-let portfolio mortgage products, from across the complete spectrum of UK lenders to ensure your landlord business is as profitable as possible.

Give us a call on 0330 304 3040 or drop us a message at [email protected].

What is a Portfolio Loan Mortgage?

A buy-to-let portfolio mortgage isn't too different from a standard buy-to-let mortgage - the critical difference is that it covers multiple properties within one portfolio.

This is ideal for investors who are looking to buy several properties at once, want to remortgage their BTL residences through one mortgage provider, or are looking to find cheaper rates on the landlord buy-to-let portfolio mortgage market.

Property or loan details

Error: Property must be valued at £50,000 or more.

Error: Estimated rental income must be between £1 and £99,999.

Based on your details, you can borrow up to:


This calculator is an estimation of how much you could borrow. If you’re ready to take out a mortgage, speak to a Revolution brokers to see what options are available.

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How a Buy To Let Portfolio Mortgage Works

A buy-to-let portfolio mortgage covers all of the properties in a portfolio, under one lending 'umbrella'.

That means that you manage one buy-to-let portfolio mortgage account, rather than multiple accounts for every individual property within your portfolio.

A buy-to-let portfolio mortgage also means you have:

  • One point of contact for your landlord lending.
  • One monthly account to manage.
  • One set of regular repayments.
  • One statement to review and keep track of.

Typically, this works by creating a limited company to manage ownership of your portfolio and the buy-to-let portfolio mortgage borrowing.

All of your costs and finances are then put through the business, which ensures you can take advantage of tax-efficiencies available, as well as streamlining your property business.

Usually, a buy-to-let portfolio mortgage is available to landlords with four properties, or more.

Regulations for Multiple BTL Properties

The rules around lending for multiple buy to let properties depends on your buy-to-let portfolio mortgage lending provider. They're also influenced by the local authority licensing requirement in your region, which can vary across the UK.

Most lenders of this type of buy-to-let portfolio mortgage finance are regulated by the Bank of England's Prudential Regulation Authority (PRA), and therefore are subject to their rules.

PRA regulations determine the underwriting processes required, so each buy-to-let portfolio mortgage lender must undergo affordability testing to higher criteria, and run the requisite checks before offering portfolio landlord mortgages.

These increased checks make it laborious for investors to collate the required documentation, complete each stage of the application process, and then finally wait for a decision.

Thus, Revolution Brokers represent a growing number of landlords who recognise the advantages of a buy-to-let portfolio mortgage but appoint a professional broker to manage the application process on their behalf.

Affordability Checks for Landlord BTL Portfolio Mortgage Applications

Previously, landlord affordability was based on the expected rental income from the mortgaged properties, and what sort of deposit was available.

Affordability assessments are now more complex and require rigorous assessments to ensure lenders are providing financing responsibly.

Your tax liability comes into consideration since landlord taxes have risen. So any buy-to-let portfolio mortgage lender needs to verify that you will be able to keep up with your mortgage repayments.

As a typical illustration:

  • A buy-to-let portfolio mortgage lender would like to see rental income at 125% of the mortgage repayments for a basic rate taxpayer.
  • For a higher-rate taxpayer, they would need to see rental income cover of more like 145 or even 160%.
  • In addition, a buy-to-let portfolio mortgage  application will be stress tested. This means that the lender will speculate about what might happen if interest rates increase to 5%, or 5.5% and check if you'd still be able to afford your mortgage.

Which borrowers are considered portfolio landlords?

You'll usually be considered a portfolio landlord if you own at least four properties.

Landlords are not considered portfolio landlords if:

  • You have three investment properties, rather than four.
  • You own more than four properties, but three or fewer are mortgaged.

If you are considered an eligible portfolio landlord for a buy-to-let mortgage application, your lender will then go through underwriting checks, and portfolio mortgage stress testing.

Affordability checks on a buy-to-let portfolio mortgage ensure that your finances are stable and that you can afford to take out the lending.

The exact affordability criteria vary between lenders, but will always consider factors such as:

  • How experienced you are as a landlord.
  • What mortgage lending you already have.
  • Your other debts, assets and tax liabilities.
  • What rental income your property portfolio is expected to generate.
  • Other revenue streams.

Outcomes of stress testing will vary between lenders. For example, one might be happy to extend lending against your portfolio provided four of five properties generate sufficient rental cover to keep up the buy-to-let portfolio mortgage payments, but one doesn't.

Another buy-to-let portfolio mortgage lender might reject the same application if they have stricter criteria.

It is therefore always ideal to work with an experienced broker such as Revolution Finance Brokers.

We consult with you before any buy-to-let portfolio mortgage lending applications are made to understand your circumstances, your portfolio, and your borrowing requirements. Then we get to work analysing the market for the most competitive deals, and the lenders we know are most likely to be able to approve the lending you need.

Give us a call on 0330 304 3040 or send the team a message at [email protected].

Can I Get a Buy to Let Portfolio Mortgage for Multiple Properties?

You can; indeed, there are no limits to how many buy-to-let portfolio mortgage products you can take out, provided you can afford to make the repayments.

Some buy-to-let portfolio mortgage lenders won't consider extending multiple mortgages, and others will have rules about how many existing mortgages you can have for them to make an offer.

We work with multiple BTL specialist lenders who are happy to consider applications from landlords with large portfolios.

One of the crucial factors to expanding your property portfolio is to have up to date records of each property, the income it generates, and any borrowing owed against it, as any prospective new buy-to-let portfolio mortgage lender will need to be able to review this information.

Why Do Tax Brackets Impact BTL Mortgage Affordability Assessments?

Tax matters because changes to tax relief on buy-to-let portfolio mortgage interest have had a significant impact on the profit margins some landlords make on their properties.

This adds a layer of complexity to calculating affordability since lenders need to assess additional costs, including the 3% additional Stamp Duty levied on property investors.

The change to buy-to-let portfolio mortgage tax relief means that:

  • Previously, landlords could claim their buy-to-let portfolio mortgage interest as an expense directly deductible from their rental income. This reduced their declarable income, and therefore the tax bracket they fell into, as well as reducing the total profit and the amount of tax payable.
  • From April 2020, this has changed, so buy-to-let portfolio mortgage expenses are not deducted from rental income. This means many landlords have slipped into a higher tax bracket, so even when all costs have been removed to arrive at a profit figure, they'll need to pay a higher percentage of those profits in tax,

These changes only apply to residential BTL landlords, and tax specialists can help mitigate the overall tax charges and help you structure your portfolio most efficiently.

How To Secure a Buy To Let Portfolio Mortgage for Multiple Properties

Suppose you wish to take out mortgage lending for more than one investment property. In that case, the ideal process is to consult with an expert mortgage broker experienced in the buy-to-let portfolio mortgage lending market.

One option is to incorporate a limited company to manage the ownership of your properties. Typically this is either as:

  • A normal trading company
  • A special purpose vehicle company (SPV)

Many landlords choose to set up an SPV.

BTL Mortgages for Limited Companies

As more landlords use SPVs to manage their portfolios, more lenders are offering less strict stress test criteria for companies taking out a buy-to-let portfolio mortgage.

This is because companies have more advantageous tax efficiencies available to them than individual landlords and won't fall into any higher rate tax brackets.

Is It Possible to Have Multiple Limited Company Landlord Mortgages?

Theoretically, yes, there isn't any limit on how many company buy-to-let portfolio mortgage products can be taken out.

However, as with individual landlord mortgages, each buy-to-let portfolio mortgage lender will have their own criteria on how much exposure they consider acceptable for one company and may limit the number of buy-to-let portfolio mortgage offers, or the number of properties, they are willing to lend against.

How Can I Find Lenders With Competitive Buy To Let Portfolio Mortgage Rates?

Multiple buy-to-let portfolio mortgage lenders will extend lending against portfolio mortgages. This type of borrowing helps landlords to manage their finances and potentially invest in a more extensive portfolio with fees and repayments simplified.

The considerations you should think about when it comes to a buy-to-let portfolio mortgage are:

  • Deposit: for non-cash property investment, you will require a deposit of at least 15% and sometimes a minimum of 25%. This can be raised by remortgaging your existing property.
  • Equity: Should you be remortgaging to raise a deposit to expand your portfolio, you'll need to know what equity you have in that property, i.e. how much you own and how much you owe.

In property investment, buy-to-let portfolio mortgage lenders talk about the loan to value rate or LTV. This ratio is the amount of lending as a proportion of the total property value.

If you do decide to remortgage your main home to raise money for a new BTL mortgage, your buy-to-let portfolio mortgage lender might offer as high as a 95% LTV.

Buy To Let Portfolio Mortgage Lenders LTV Example

As an example:

If your residential property is worth £500,000, and you have equity of 50% with £250,000 owed on a mortgage, you might choose to remortgage and use that £250,000 towards buying a new rental property.

With a £250,000 down payment, you would be likely to be able to buy a higher value investment property, with an LTV of up to 95%.

In general buy-to-let portfolio mortgage lenders prefer a lower LTV which limits their exposure. The higher the LTV, the higher the interest rates and fees payable to the lender.

Other factors that impact the offered buy-to-let portfolio mortgage LTV include:

  • Your age
  • Your credit history
  • The reason for the borrowing

On residential mortgages, the standard LTV is 95% lending with a 5% deposit, but for buy-to-let properties, the standard is a maximum of 85% lending with a 15% deposit.

Choosing the Right Buy To Let Portfolio Mortgage Lenders

An increasing number of lenders offer buy-to-let portfolio mortgage products, each with different criteria that an application has to meet to be successful.

Some high street lenders also offer this sort of buy-to-let portfolio mortgage product, although the lending criteria may not be as advantageous as through specialist lenders.

Typical lending criteria include:

  1. NatWest: applicants must have four or more properties, not held in a limited company. Assessments depend on the landlord's experience, whether properties are let through an agent, and expectations for expanding or reducing their portfolio in the future.
  2. Santander: do not generally lend against portfolio mortgages unless the applicant is for a remortgage outside of raising capital and meets the bank's transitional arrangements eligibility criteria.
  3. Virgin: landlords must have at least two years of experience, and a maximum of five properties within the postcode area. Personal income may not be considered within the affordability assessment, although this information must be verified.
  4. Barclays: Individual income will be considered as well as rental income and ongoing expenses. The assessment includes looking at how fast the portfolio has been expanded, capital appreciation values, the quality of tenants in place, occupancy levels, whether properties are let through an agent, the property portfolio strategy and what funding requirements the landlord expects to have in the future.

Each lender is different; some, for example, will not lend on multiple occupancy properties as part of a portfolio. Others will have a limit on what proportion of the portfolio this type of property can be.

If you are looking for a buy-to-let portfolio mortgage and would like to find a specialist lender who meets your criteria, get in touch with Revolution Finance Brokers.

We are wholly independent and therefore have access to the whole of the lending market to find the most competitive deals and advantageous terms for your lending requirements.

What is a Buy To Let Portfolio Mortgage Affordability Assessment?

Buy-to-let affordability looks at a combination of factors, including:

  • How much rental income you expect to make.
  • Your personal circumstances and whether there is any potential you won't be able to keep up with repayments.
  • The rest of your portfolio and other lending you have.
  • Your total assets, borrowings, and income.

Some lenders will want to see proof of your income outside of your rental properties; others have no minimum income requirement.

Where no external income minimum exists, this type of lending is called a BTL mortgage for professional landlords.

A good benchmark for a basic rate taxpayer is to work on investing in a property that generates income at 125% or more of the buy-to-let portfolio mortgage repayments.

This increases to 145-160% if you're a higher rate taxpayer.

As an indicative example, the associated figures in a buy-to-let portfolio mortgage  affordability assessment may look like this:

Your tax bracket

Mortgage repayment cover required

Example BTL mortgage balance

Interest stress testing rate

Monthly interest payment

Monthly rental income needed to demonstrate affordability

Basic rate taxpayer






Higher rate taxpayer






Top rate taxpayer






What is Top-Slicing in BTL mortgages?

Top-slicing is where you use some of your personal income to supplement the anticipated rental income used in the affordability assessment.

This is usually where the expected rent revenue isn't quite high enough to meet the criteria, for the lender to extend an offer for the full amount of borrowing you need.

Whether or not top slicing can be taken into consideration depends on the policies of the lender.

If you're looking to take out a landlord buy-to-let portfolio mortgage and are unsure about whether the projected income will meet affordability assessments, or whether top-slicing is a viable option in your circumstances, get in touch with Revolution Finance Brokers.

Can a Landlord Get a Portfolio Loan Mortgage if they Have Poor Credit?

They can - although the number of lenders who are worth approaching reduces if you have a bad credit history. It all depends on what sort of problems you have experienced, and when they occurred.

A buy-to-let portfolio mortgage lender will ask for some details about what occurred and whether the situation has now been resolved.

This helps them to assess whether the issues are likely to be repeated.

Even if even one the below appear on your credit history, you can still secure a buy-to-let portfolio mortgage provided you use a broker to connect with the right lenders:

  • Late payments or defaults
  • CCJs or debt management plans
  • IVA repayment plans
  • Bankruptcy

Revolution Brokers are a specialist mortgage broker and experts in negotiating buy-to-let portfolio mortgages for landlords in any set of circumstances.

Give the team a call on 0330 304 3040 for tailored advice about progressing your borrowing requirements.

Are Some Types of Property Easier to Get a Buy to Let Portfolio Mortgage For?

Standard properties are the most accessible types of investment proposition to finance - this includes traditional construction properties, that are residential terraced, semi-detached or detached, and purpose-built residential flats.

Properties which are more complex to borrow against as part of a property portfolio include:

  • Studio flats.
  • Ex-council properties.
  • Non-standard buildings (i.e. concrete or timber-frames).

When seeking buy-to-let portfolio mortgage lending for a non-standard property, it is essential to work with a broker who can negotiate the best terms with the right lenders who we know will be happy to consider your application.

Are There Age Limits on Buy-To-Let Portfolio Loan Mortgages?

The majority of lenders have a minimum age limit of 18 years old. Mature borrowers who are looking for a buy-to-let portfolio mortgage may encounter upper age limits or a maximum amount of time that a lender will be willing to extend an offer for.

However, working with an expert broker ensures that you will secure the right lending with a provider who can process your application successfully.

Revolution Brokers work with several BTL portfolio lenders who do not have a maximum age limit.

Where is the Best Place to Create a UK Property Portfolio?

Your choice of investment area will depend on multiple factors, such as where you live, the areas you like, where you are familiar with, and rental income levels and property purchase prices in those respective areas.

Buy-to-let portfolio mortgage lending is growing in Scotland, as the large variance between Scottish and English property prices becomes more substantial. As an indication, in 2019 the average property price in Edinburgh was £236,900 when compared to £483,000 in London and £124,800 in Glasgow.

It is vital to be mindful of different property acquisition rules in Scotland, and changes in Stamp Duty rates to budget for.

Should I Insure my Property Portfolio?

There is no mandatory requirement, but property portfolio insurance is a valuable asset to protect you from expenses and problems in the future.

Portfolio insurance usually covers buildings and/or contents across multiple premises, which makes it much more streamlined and cost-effective than managing several different policies, each for a different investment property.

If you would like support on choosing the most competitive property portfolio insurance, drop us a message at [email protected], and we will be happy to advise.

Expert Support Finding Top Buy To Let Portfolio Mortgage Rates

Whether you are looking to expand your portfolio, remortgage several properties, or are weighing up your options, Revolution Finance Brokers are on hand to make the buy-to-let portfolio mortgage comparison and application processes a breeze.

As fully independent brokers, we work with landlords across the UK to secure off-market terms and interest rates, negotiating your buy-to-let portfolio mortgage to match your specific circumstances.

Send us a message or give our landlord's team a call on 0330 304 3040 for bespoke advice and support.

Almas Uddin
Almas Uddin

Founder and Mortgage Advisor

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FCA disclaimer

The content included in our articles, blogs, web pages and news publications is based on information accurate at the time of writing. Note that policies and criteria can change regularly throughout the UK mortgage lending market, and it remains essential to contact the consultation team to receive up to date guidance. The information included on the Revolution Brokers site is not bespoke to any circumstances or individual application scenarios and therefore is not intended to be used as financial advice. The content we share is designed to be informative and helpful but cannot be relied upon to provide individual advice relevant to your mortgage requirements. All Revolution team members are fully qualified, trained and experienced to provide mortgage advice of an independent nature.

We collaborate with lenders and providers who are regulated, authorised and registered with the Financial Conduct Authority (FCA). Should you require specific mortgage borrowing types, some products such as buy to let mortgages may not be FCA regulated. The Revolution team can provide further information about regulated and unregulated lending as required. Please remember that a mortgage is a debt which is secured against your home or property. Your home can be at risk of repossession if you do not keep up with the repayments or encounter any other difficulties in managing your mortgage borrowing responsibly. This also applies to any remortgage or home loan secured against your property, including equity release products.

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