Why Your Credit Score Looks Different on Every App
Credit scores are not one number set by the government, they are estimates made by competing agencies from the same raw data, which is why checking your credit report matters more than chasing a score.
There is no single, official credit score
Many people assume there is one true credit score, perhaps held by the government or a bank, that follows them around. There is not. In the UK, three main credit reference agencies collect data about how you borrow and repay: Experian, Equifax and TransUnion. Each one builds its own file on you and calculates its own score using its own formula. A lender might also use a fourth, entirely different scoring model on top of all that, built specifically for its own products.
This is why the number you see in a banking app, a free checking service, or a comparison website can look wildly different from one place to the next. One provider might show a score out of 999, another out of 700, another as a simple band such as fair, good or excellent. These are not directly comparable, and none of them is the definitive verdict on you as a borrower.
Why the underlying data can differ too
It is not just the scoring formula that varies, it is the data feeding it. Not every lender reports to every agency. A credit card provider might report your repayment history to Experian and Equifax but not TransUnion, for example. That means your Experian file could show six years of perfect payments on that card while your TransUnion file shows nothing about it at all. Neither file is wrong, they simply hold different pieces of the same picture.
This matters practically because when you apply for credit, the lender you are applying to will usually check only one or two of the three agencies, not all of them. So a mortgage broker might tell you your Equifax file looks strong while a separate application is refused because the lender used TransUnion data that tells a slightly different story.
What actually goes into the score
Despite the different formulas, the agencies are working from broadly the same categories of information, and it is worth understanding these because they matter far more than the three-digit number itself.
- Your repayment history on loans, credit cards, mobile contracts and other credit agreements, including any missed or late payments
- How much of your available credit you are using, sometimes called credit utilisation
- The length of your credit history and how old your accounts are
- Whether you are on the electoral roll at your current address
- How many new credit applications you have made recently
- Public financial records such as county court judgments or bankruptcy
A search on your file from a lender considering an application, known as a hard search, is visible to other lenders and too many in a short space of time can make you look like you are in financial difficulty, even if each individual application was harmless. Checking your own report, known as a soft search, does not affect your score at all.
Why this makes the report more useful than the score
Because the score is really just each agency’s private guess about risk, the more useful habit is to read the actual report behind it rather than fixate on the headline number. Reports show the raw facts: which accounts are open, whether payments were on time, what your outstanding balances are, and whether anyone has searched your file. Errors here are common and can be dragging your score down for reasons that have nothing to do with your real financial behaviour.
Typical mistakes worth checking for include accounts that are not yours, perhaps due to a similar name or a former resident at your address, joint accounts with an ex-partner still linked to your file long after you separated finances, and old debts marked as unpaid when they were actually settled or defaulted so long ago they should have dropped off. Each agency has a formal process for disputing incorrect information, and if you can show it is wrong, it must be corrected or removed within a set timeframe.
Practical steps that work across all three agencies
Because you cannot control which agency a lender will check, the sensible approach is to keep your file clean everywhere rather than optimise for one score. Get yourself on the electoral roll at your current address, pay everything on time or set up direct debits so you cannot forget, keep your credit card balances well below their limits, avoid applying for several products in quick succession, and check all three reports periodically rather than just one. Each agency is required to let you see your statutory report, and there are free ways to check all three through MoneyHelper’s guidance without harming your score.
The number itself will always be a moving target that varies by provider. The report underneath it is the same everywhere. Keep that accurate and the scores, whichever version a lender happens to look at, will generally take care of themselves.