Credit Scores and Mortgages: What Lenders Really See

When people worry about their mortgage chances, the first thing they usually mention is their "credit score". It is one of the most misunderstood parts of the whole process. So let me clear it up, in plain English, and show you exactly what to check and how to put yourself in the strongest position before you apply.

The "credit score" myth: there isn't just one

Here is the thing most people don't realise: there is no single, official credit score that follows you around. In the UK there are three main credit reference agencies, Experian, Equifax and TransUnion, and each one holds its own data on you and works out its own score on its own scale. A "good" score with one can look different with another.

More importantly, mortgage lenders don't actually use those headline numbers. When you apply, the lender looks at the underlying information on your file and runs it through their own scoring, which is unique to them. That is why you can be turned down by one lender and accepted by another with an identical application. The number you see on an app is only ever a rough guide.

What a mortgage lender actually looks at

Whatever the app says, these are the things that genuinely move the needle on a mortgage decision:

• Payment history: have you paid credit cards, loans, mobile and utility accounts on time? Missed or late payments are one of the biggest red flags.
• Defaults, CCJs and insolvencies: these carry a lot of weight and stay on your file for six years. How recent they are matters as much as whether they exist.
• How much of your available credit you are using: running cards close to their limit month after month can count against you, even if you always pay.
• Are you on the electoral roll? Being registered to vote at your current address is a simple, free way to look more stable to a lender.
• Recent applications: lots of credit applications in a short space of time can look like you are under pressure.
• Total debt and commitments: lenders weigh existing debt against your income when working out what they will lend.

How to check your credit file properly

Because your data is split across the main agencies, checking just one of them only tells you part of the story. You could look clean on one and have an error or a missed payment showing on another.

The tool I point people to is checkmyfile, because it brings your information together from the main UK credit reference agencies (including Experian, Equifax and TransUnion) into one single, readable report. Instead of logging into three separate services and trying to compare them, you see everything in one place, which is exactly the fuller picture a lender is working from.

You can start with a free 7-day trial, and it then moves to a monthly subscription that you can cancel at any time.

What to check on your report, line by line

Once you have your report in front of you, don't just glance at the score. Go through it properly:

• Your personal details and address history: make sure they are correct and that you are on the electoral roll at your current address.
• Every account listed: do you recognise all of them? An account you don't recognise can be a simple error, or a sign of fraud.
• Payment markers: look for any late payments, defaults or CCJs, and check they are accurate. Mistakes are more common than you would think.
• Credit utilisation: how much of your limits are you using? Bringing balances down before you apply can help.
• Financial associations: if you have ever held a joint account with an ex-partner, you can still be "linked" to them. Their credit problems can affect you, so ask for a notice of disassociation if you are no longer connected.

Is it worth keeping a subscription going?

For a quick one-off check, a free trial may be all you need. But there are good reasons to keep monitoring your file for a few months in the run-up to a mortgage application:

• You can watch it improve: as you pay debts down, register to vote or clear a default, you can actually see the effect month to month, rather than guessing.
• You catch errors and fraud early: a new account or search appearing that you don't recognise is something you want to spot straight away, not on the day your mortgage is being assessed.
• Everything stays in one place: monitoring across all the main agencies together means nothing slips through the cracks because you only checked one.
• You apply with confidence: going into an application knowing exactly what the lender will see takes a lot of the stress out of it.

Once you have completed your purchase and settled in, you can simply cancel. Many people keep it running until the mortgage is done and then stop.

How to improve your file before you apply

If a mortgage is on the horizon, here are the practical, no-nonsense things that genuinely help:

• Get on the electoral roll at your current address. Quick, free, and lenders like it.
• Pay everything on time, every time, in the months before you apply. Setting up direct debits for at least the minimums avoids slip-ups.
• Bring card balances down where you can, ideally well below the limit.
• Avoid new credit in the run-up to applying. No new car finance, cards or "buy now, pay later" just before a mortgage.
• Correct any mistakes you find, and add a notice of correction if there is a genuine reason behind a missed payment.
• Disassociate from ex-partners you no longer share finances with.

Credit myths worth ignoring

• "Checking my own file hurts my score." It doesn't. Checking your own report is a soft search that only you can see. It has no effect on your score or on lenders.
• "I've never had credit, so I'll be fine." Not always. A very thin file with no track record can actually make you harder to assess. A small, well-managed history helps.
• "I need to be debt-free." No. Lenders want to see credit used sensibly and paid on time, not necessarily an absence of it.

If your credit has had a few bumps, don't assume the door is closed. It is worth reading our guide on mortgages with bad credit, and if you are self-employed, how lenders assess your income in our self-employed mortgage guide. And before you house-hunt, an Agreement in Principle gives you a clear idea of what you can borrow.