If you’re applying for a mortgage, one of the first things you’ll come across is a Decision in Principle (DIP).
It sounds official. It feels like approval. And it’s very easy to misunderstand.
So let’s break it down properly.
What Is a Decision in Principle?
A Decision in Principle (also called an Agreement in Principle or AIP) is an initial indication from a lender that they may be willing to lend to you, based on basic information.
It’s usually based on:
- Your income
- Estimated outgoings
- A credit check (soft or sometimes hard)
- The amount you want to borrow
Think of it as:
A “maybe”, not a “yes”
What a DIP Actually Tells You
A DIP can give you:
- An idea of how much you might be able to borrow
- Confidence to start house hunting
- Something to show estate agents to prove you’re a serious buyer
It’s useful.
But it’s not a guarantee.
What a DIP Does Not Guarantee
This is where most people get caught out.
A DIP does not mean:
- Your mortgage is approved
- The lender has fully assessed your situation
- The same result will happen at full application
- You won’t be declined later
At DIP stage, lenders are not doing full underwriting.
They are not:
- Deep-diving into your credit file
- Verifying documents in detail
- Assessing edge cases properly (like historic DMPs, defaults, or affordability concerns)
That all comes later.
Soft Search vs Hard Search
DIPs can involve either:
Soft Search
- Doesn’t affect your credit score
- Only visible to you
- Most common for initial checks
Hard Search
- Leaves a visible footprint
- Seen by other lenders
- Sometimes used depending on lender or broker process
Always worth checking which one is being used.
Why a DIP Can Be Wrong
A DIP is only as good as the information and logic behind it.
It can give a misleading result if:
- Your credit file has nuances (defaults, arrangements, etc.)
- Something is misinterpreted (e.g. historic vs ongoing issues)
- Your situation is borderline or complex
- The lender’s system applies simplified rules
In short:
It’s a surface-level assessment
What Happens After a DIP?
Once you proceed:
- You submit a full application
- Documents are verified (income, deposit, etc.)
- Full credit checks are reviewed in detail
- Underwriting assesses your case properly
- A valuation is carried out on the property
Only then do you get:
A formal mortgage offer (or not)
Why a DIP Can Lead to a Different Outcome
This is where frustration usually kicks in.
You can go from:
“Approved in principle”
to
“Declined” or “reduced terms”
Because:
- The DIP didn’t catch something
- The lender interprets your situation differently at full review
- Additional checks reveal more detail
This is especially common with:
- Adverse credit
- Debt management plans
- Recent defaults
- High levels of borrowing
FAQs About Mortgage Decisions in Principle
Does a DIP mean I’ll get the mortgage?
No. It means the lender might lend to you based on initial checks. Full approval only happens after underwriting.
How long does a DIP last?
Typically 30 to 90 days, depending on the lender.
Does a DIP affect my credit score?
- Soft search: No
- Hard search: Potentially, yes
Always check which type is being used.
Can I get declined after a DIP?
Yes, and it happens more often than people expect.
A DIP is not a guarantee.
Why would a lender change their decision?
Common reasons include:
- More detailed credit checks
- Different interpretation of your financial history
- Affordability concerns after full review
- Issues with documentation
Can I have multiple DIPs?
Yes, but be careful:
- Multiple hard searches can impact your credit profile, although typically a DIP is based off a soft-search
- Using a broker can help manage this
Should I rely on a DIP when making an offer?
It’s useful, but don’t rely on it completely.
If your situation is complex, a DIP may not reflect the final outcome.
Final Thoughts
A Decision in Principle is a helpful starting point, but it’s exactly that: a starting point.
It gives you:
- Direction
- Confidence
- A rough idea of what’s possible
But it doesn’t replace:
- Full underwriting
- Proper assessment
- Or clear communication from the lender
If your finances are straightforward, a DIP will often be accurate.
If they’re not, it’s best treated with a bit of caution.
