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Mortgage in Principle: Understanding the Basics and Answering Common Questions

A Mortgage in Principle (MIP), also known as an Agreement in Principle (AIP) or Decision in Principle (DIP), is an important step in the home-buying process. It is a statement from a lender indicating how much they are willing to lend to you, based on an initial assessment of your financial situation.

While it is not a guarantee of a mortgage, it provides a useful indication of what you can afford and can strengthen your position as a serious buyer.

Below, we address some of the most frequently asked questions about a Mortgage in Principle.

  1. What is a Mortgage in Principle?

A Mortgage in Principle is a document provided by a lender that states how much they would be willing to lend you, based on a preliminary evaluation of your finances. It is not a formal mortgage offer but rather an estimate that gives you an idea of your borrowing capacity.

This preliminary assessment is based on the basic financial information you provide and, in many cases, a soft credit check.

  1. Why do you need a Mortgage in Principle?

A Mortgage in Principle, can be useful for several reasons:

  • Budgeting: It helps you understand how much you can afford to borrow, giving you a clearer picture of your budget when house hunting.
  • Credibility: It shows sellers and real estate agents that you are a serious buyer, which can be advantageous in competitive markets where sellers consider multiple offers.
  • Efficiency: It can speed up the mortgage application process once you find a property you wish to purchase, as some of the initial paperwork and credit checks will already be completed.
  1. How do I Apply for a Mortgage in Principle?

You can apply for a Mortgage in Principle through a lender or a mortgage broker. The process typically involves:

  • Providing information about your income, expenses, and financial situation.
  • Undergoing a credit check.
  • Supplying documentation to verify your identity and financial status.

Most lenders have streamlined this process, allowing you to apply online, over the phone, or in person. Many lenders can provide a Mortgage in Principle within 24 to 48 hours, although this can vary.

  1. What Information Will the Lender Require?

To assess your application for a Mortgage in Principle, lenders usually ask for:

  • Proof of income: This may include pay stubs, tax returns, or a letter from your employer.
  • Details of your monthly expenses and debts: This includes any loans, credit card payments, and other regular financial commitments.
  • Identification documents: Commonly, a passport or driver’s licence is required.
  • Credit check consent: Lenders will need your permission to perform a credit check, which will help them assess your creditworthiness.
  1. Does a Mortgage in Principle Affect my Credit Score?

Applying for a Mortgage in Principle typically involves a credit check, which can either be a soft or hard inquiry. A soft inquiry does not affect your credit score, while a hard inquiry might have a slight impact. It is important to confirm with the lender which type of check they will perform.

Generally, soft inquiries are used for initial assessments, while hard inquiries are more common during the final mortgage application process.

  1. How long Does a Mortgage in Principle Last?

A Mortgage in Principle is usually valid for 60 to 90 days. However, this period can vary depending on the lender. If your MIP expires before you find a property, you can request a renewal, which might involve another credit check and reassessment of your finances.

Keeping your financial situation stable during this period is crucial to avoid complications when you proceed to a full mortgage application.

  1. Is a Mortgage in Principle Guaranteed?

No, a Mortgage in Principle is not a guarantee of a mortgage. It is based on preliminary information and is subject to further checks and assessments when you submit a full mortgage application.


Factors such as changes in your financial situation, a more detailed review of your credit history, and the property’s valuation can affect the final decision.

  1. Can I Get Multiple Mortgages in Principles?

While it is possible to obtain multiple Mortgage in Principles from different lenders, it is not advisable to do so frequently, as multiple hard credit inquiries can negatively impact your credit score. It’s best to research and compare lenders first to choose the most suitable one before applying.

Consulting with a mortgage broker can also help streamline this process, as they can access multiple lenders on your behalf.

  1. What Happens After I Get a Mortgage in Principle?

Once you have a Mortgage in Principle, you can begin house hunting with a clearer idea of your budget. When you find a property you want to buy, you can proceed with a full mortgage application, where the lender will conduct a more thorough evaluation of your finances and the property itself.

This includes a detailed credit check, an appraisal of the property, and verification of all the financial information you initially provided.

  1. Can I be Declined for a Mortgage After Getting a Mortgage in Principle?

Yes, it is possible to be declined for a mortgage after receiving a Mortgage in Principle. The final mortgage offer depends on a more detailed assessment of your finances, a property valuation, and other factors. If there are significant changes in your circumstances or issues with the property, the lender may decide not to proceed with the mortgage.


Common reasons for denial at this stage include discrepancies in income documentation, changes in employment status, or a lower-than-expected property valuation.


A Mortgage in Principle is a valuable tool in the home buying process, giving you an estimate of how much you can borrow and helping you position yourself as a serious buyer. However, it is important to remember that it is not a guarantee of a mortgage.

By understanding the process and knowing what to expect, you can use a Mortgage in Principle to your advantage and move closer to securing your dream home. With careful planning and the right information, obtaining a Mortgage in Principle can provide you with the confidence and clarity needed to navigate the often complex journey of purchasing a property.