Buy to Let Agreement in Principle
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Home » What Is A Mortgage? » Buy to Let Mortgages » Buy to Let Agreement in Principle
Buy to Let Agreement in Principle
At Expert Mortgage Brokers, we understand that securing a Buy to Let mortgage starts with the right planning. In this comprehensive guide, we break down the key questions around a Buy to Let Agreement in Principle (AIP) with one of our experts, Jahed. Read on to learn exactly what an AIP is, why it is essential for property investors, how to apply, what documents you will need, and how we can help you navigate the process efficiently.
What is an Agreement in Principle and why do I need one for a Buy to Let?
An Agreement in Principle (AIP), sometimes known as a Decision in Principle (DIP), is a conditional statement from a mortgage lender. It confirms how much they may be willing to lend to you based on the initial information you have given them. You need one because most estate agents and vendors will want to see proof that you can secure the borrowing you have told them about. An AIP illustrates this.
How do I get an Agreement in Principle for a Buy to Let mortgage?
There are a couple of ways you can get an AIP. You can obtain it directly from a high street lender by sending them your information and telling them about the Buy to Let property you want to buy. They will give you an Agreement in Principle and perform a small, soft credit check on your name. Alternatively, a mortgage broker will match your profile with suitable lenders. They can help you avoid unnecessary searches and factor in things like your tax band to get you an Agreement in Principle.
Do I have to have an Agreement in Principle through the estate agent I am looking to purchase through?
No, absolutely not. Estate agents may try to push their own in-house broker on you, but legally you are free to choose your own broker, and an agent cannot refuse this. You do not have to go with their broker. It is advisable to speak to a broker first before you even think about buying, as they can give you peace of mind by confirming what you can buy, what they are offering, and the rates. This way, you are not pushed into using a broker or an agent you are not comfortable with.
Can I make an offer on a Buy to Let property with an Agreement in Principle?
Yes, and in many cases, you should. An AIP allows you to make an offer confidently, negotiate more effectively, and compete with other buyers. It also shows that you are a serious buyer and are hopefully ahead of others by having an Agreement in Principle.
How do I apply for an AIP for a Buy to Let and how long does this take?
The process can often take place on the same day, sometimes even within minutes, once you have had the conversation with a broker or lender. To achieve this, you need to have an initial discussion with your broker or lender, provide your basic personal and financial details, and estimate what you think the rent will be on the property. Then, they will check your credit. If you have provided all the documentation and had that discussion, they can check it and give you the AIP.
What information or documents do I need to get an Agreement in Principle for a Buy to Let mortgage?
You will need standard documents, including your ID, bank statements, and payslips. It is also advisable to look at your credit report beforehand. If you are a portfolio landlord, you may also need to send your portfolio details to your broker or lender.
How is affordability calculated for a Buy to Let mortgage Agreement in Principle?
Buy to Let affordability is primarily rental-based, not income-based. Lenders will look at the Interest Cover Ratio (ICR) to see if there is enough rental coverage. They also look at a stress rate, which is usually 5% to 6% as of 2026. The typical rules are 125% rental cover for a basic rate taxpayer and 145% to 160% for a higher rate taxpayer. Anyone earning over £40k to £50k is generally considered a higher rate taxpayer, and those under that are lower rate. If you have more than three properties, you are also more likely to be a higher rate taxpayer. Generally, it is based on whatever the property generates, and with most lenders, you can borrow up to 75% of the property’s value.
Is an Agreement in Principle guaranteed? Can my Buy to Let mortgage be declined after an Agreement in Principle?
No, an AIP is not guaranteed, and your mortgage can definitely still be declined. A decline can happen after an AIP because the lender is also looking at the property itself. Potential factors for a decline include:
- The property valuation is declined.
- Inaccurate information was given at the AIP stage.
- A change in your credit status.
- The rental income or the property does not meet the lender’s final criteria.
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Will I need a credit check for a Buy to Let AIP? Does this affect credit score?
Yes, most lenders will check your credit, but they typically do a “soft search.” Normally, this does not affect your credit score. However, be aware that doing too many soft checks can affect your score, because lenders will see that you have done multiple checks on your name. The hard check on your credit score is done once you submit the full application.
How will bad credit affect an Agreement in Principle?
Bad credit does not automatically rule you out from getting an AIP. It changes where you can get your Agreement in Principle from. Certain high street lenders usually do not take bad credit into account. You would then look at other lenders – the smaller banks you may not see on the high street – who will take it into account. The worse your credit is, the less likely you are to get lending, but every credit account can be looked at to try and find a suitable lender.
I’ve been declined an Agreement in Principle? What can I do?
First, do not panic and do not keep applying. You should speak to a broker and go through your credit report from any credit engine you may use, such as Experian or Equifax. Review it, as there may be an error or something you are unaware of. You should use your credit score to the best of your ability with the broker. They can analyse it and explain why you were declined with one lender and then help you find another lender who will take your situation into account.
What are the benefits of getting an AIP with a mortgage broker? How can a mortgage adviser help?
A mortgage broker will source the most suitable lender for you. By having a conversation with you and going through your credit report, bank statements, payslips, and SA302 forms, they can calculate the most suitable lender for you. They look at all the options to determine your best position, considering factors like rate incentives, time incentives, or schedule incentives, and will hopefully recommend the right lender for you. They help you get the right AIP, avoiding declines and the back and forth of trying to find an AIP that suits you on your own.
Summary
An Agreement in Principle is a key tool to have before going into the market, as it puts you ahead and makes you look like a serious investor or buyer. An AIP is a conditional statement of how much a lender may be willing to lend you. Affordability is primarily rental-based, not income-based, with lenders looking at the rental coverage (ICR) and a stress rate.
While an AIP is a soft credit check that normally does not affect your credit score, multiple soft checks can have an effect.
An AIP is not a guarantee and can still be declined if there is inaccurate information, a change in credit status, or if the property or rental income does not meet the final criteria. If you are declined, do not panic or keep applying; speak to a broker to review your credit report and find a suitable lender. A mortgage broker can help you by sourcing the most suitable lender for you, thus helping you get the right AIP without the back and forth.
Key Points
- An Agreement in Principle (AIP) is a conditional statement from a lender on how much they may be willing to lend.
- An AIP illustrates to estate agents and vendors that you can get the borrowing you have told them about.
- You can get an AIP directly from a high street lender or through a mortgage broker.
- You are legally free to choose your own broker and do not have to use one pushed by an estate agent.
- An AIP allows you to make an offer confidently, negotiate effectively, and compete with other buyers.
- The AIP process can often take place on the same day, sometimes even within minutes.
- Affordability is primarily rental-based (ICR and stress rate), not income-based.
- An AIP is not guaranteed, and a mortgage can still be declined due to property valuation, inaccurate information, or change in credit status.
- An AIP involves a soft credit check, but multiple soft checks can still affect your credit score.
- Bad credit does not rule you out, but it means you may need to use a lender other than a high street bank.
YOUR PROPERTY MAY BE REPOSSESSED IF YOU DO NOT KEEP UP WITH YOUR MORTGAGE REPAYMENTS.
THE FINANCIAL CONDUCT AUTHORITY DOES NOT REGULATE MOST BUY TO LET MORTGAGES.
For specialist tax advice, please refer to an accountant or tax specialist.
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