Most founders think about credit scores when a lender turns them down, not before. By then, the score has already been working against you for months, sometimes years.

Here’s what your credit score actually does, how it’s built, and the concrete steps that move it.

Two scores, not one

If you’re a sole trader or in a partnership, there’s no separate business credit file. Your personal and business finances aren’t legally distinct, so your personal credit history is what lenders look at, according to Experian UK’s own guidance for small businesses.

If you run a limited company, your business has its own credit file, built up by credit reference agencies such as Experian, Equifax and Dun & Bradstreet. But your personal credit still matters more than most new directors expect. New and small companies often don’t have enough of a track record for lenders to judge on business data alone, so they look at your personal file instead, and many loans to small limited companies still ask for a personal guarantee, which ties your own credit to the business regardless of its legal structure.

Either way, the same instinct applies: know what’s on your file before someone else asks to see it.

How a UK business credit score actually works

Experian’s business score runs from 0 to 100. Their own guidance breaks it down like this. A score of 80 or above is considered excellent, and can unlock better rates on loans and finance. Between 40 and 80, lenders and suppliers may ask you for more information before deciding. Below 40, most lenders want to see a score above that line before they’ll agree to lend at all.

Equifax and Dun & Bradstreet run their own systems on different scales, so you won’t have one single number. That’s normal. Most UK lenders and suppliers use Experian’s model, so it’s the one worth watching most closely.

What actually moves the number

According to Experian, three factors do most of the work.

1. Filing your accounts on time

Companies House gives private limited companies nine months from the end of their accounting period to file annual accounts. Miss that deadline and the penalty starts at £150, rising to £1,500 if you’re more than six months late, and it doubles automatically if you’re late two years running. Filing full accounts, rather than the abridged or micro-entity versions, also gives lenders more to judge you on, which can work in your favour if your numbers are healthy.

2. Paying on time

This is the single biggest factor in both personal and business scores. Late payments to suppliers, lenders or HMRC all leave a mark, and a pattern of late payment is one of the fastest ways to push a score down.

3. Avoiding CCJs and insolvency

A County Court Judgment (CCJ) is issued when a court formally decides you owe money and rules against you. Once it’s on the register, it stays there for six years and makes it considerably harder to get credit, according to gov.uk. There’s one exception worth knowing: if you pay the full amount within one calendar month of the judgment, you can apply to have it removed from the register entirely, rather than just marked as satisfied. Beyond that month, it’s marked as paid but still visible for the full six years.

Beyond Experian’s three main factors, a few other things work against founders without them realising it. Applying for credit multiple times in a short period looks like financial distress to a lender, even if you’re just comparison shopping. Using an eligibility checker first, rather than applying outright, avoids this, since most checkers use a soft search that doesn’t affect your score. And if you’re a new or very small business borrowing on personal credit or a personal guarantee rather than building a business credit history, you’re missing the chance to separate your personal and business risk, which matters more as you grow.

What you can do, starting this week

●      Check your file. You’re entitled to a free statutory credit report each year from each of the main agencies. For personal credit, that’s Experian, Equifax and TransUnion. For business credit, Experian’s My Business Profile and Equifax’s business reporting both let you see what’s on file. Look for mistakes: an old address, a closed account still showing as open, a payment marked late that wasn’t. Errors are more common than people expect, and they’re free to challenge.

●      Register to vote. This sounds unrelated, but MoneyHelper, the government’s free, impartial money guidance service, confirms it’s one of the ways credit reference agencies verify your identity and address, which affects how much of your history they can match to you.

●      Set up Direct Debits for anything you can. Missed payments are the single biggest drag on a score, personal or business, and a Direct Debit removes the chance of simply forgetting.

●      Keep your utilisation down. Using more than 30% of an available credit limit, personal or business, starts to work against you. Paying down balances rather than just meeting minimums makes a real difference here.

●      Separate personal and business borrowing as soon as you can. Open a business bank account early, even before you’re sure you need business credit. It gives you a clean line between the two, and starts building a business track record independently of your personal one.

●      Ask your suppliers to report your payment history. Some suppliers and partners can report positive payment data to credit reference agencies on your behalf. It costs nothing to ask, and a track record of paying on time is one of the few things that works in your favour without you having to do anything else.

●      File on time, every time. Set a reminder for your Companies House and HMRC deadlines well before they’re due, not the week of. A single late filing is a fine. A second one, in the following year, doubles it automatically.

●      If you already have a CCJ, act inside the month. If a judgment has just been made against you and you can pay it in full, doing so within thirty days gets it removed from the register altogether rather than just marked as paid.

●      Don’t shop around with full applications. Use eligibility checkers, which run a soft search, before submitting a full application, which runs a hard one. Several hard searches in a short window can look like distress even when it isn’t.

A word on iwoca

iwoca is one of the UK’s non-bank business lenders, and it publishes a genuinely useful set of guides on business credit scores, which is where some of the detail above on credit reference agencies and improvement habits was checked against. It’s worth knowing that iwoca is a lender as well as a publisher of this information, so its guidance sits alongside independent sources like Experian and MoneyHelper, rather than replacing them. iwoca has also said publicly that it looks at more than just your credit score when assessing a loan application, including a business’s live financial data, which is worth knowing if your score doesn’t yet reflect a business that’s actually doing well.

Why this matters more than it might seem to

A weak credit score doesn’t just affect whether a bank says yes. It affects the interest rate you’re offered if they do, whether a new supplier will extend you payment terms, and whether a bigger client’s finance team flags your business as a risk before a contract is even signed. None of that reflects the quality of your idea, just a number most founders never look at until they need it.

You don’t have to work this out alone

If you want to check where you stand, or talk through what’s showing up on your file, come and talk to us. Start Your Own Enterprise at the Dock Shed covers this in detail, and a one-to-one with a mentor at Thrive or Glows can help you build a plan around it.

Get in touch with the team to talk through your credit position and your funding options.