Most people who decide to "fix" their credit score get bogged down within a fortnight, doing the wrong things. Closing old cards, opening new ones, paying off statement balances early, applying for credit they didn't need to test the waters. Six months is plenty of time to see real movement — but only if the work is targeted. Here's the plan.
Sign up to all three free credit reference agency apps:
Do this even if you've checked one of them before. Each agency has different data, and you need the full picture. Look for: late payments you don't recognise, defaults you forgot about, accounts that should have been closed but show as open, and address history errors.
Anything wrong gets disputed via the agency's online tool. Disputes typically resolve in 28 days under UK law. Wrong data being corrected can move your score by 50–150 points overnight.
If you're not already, register at gov.uk/register-to-vote. It's free and takes five minutes. The electoral roll feed updates monthly, and being absent from it costs about 50 score points across all three agencies.
Set up direct debits for the minimum payment on every credit card and the full amount on every utility, council tax, and subscription bill. Even if you intend to pay more or pay manually, the safety net catches you on the months you forget.
Late payments are by far the most damaging single factor. One missed payment can cost 50–100 points and stays on your file for six years. Two consecutive missed payments are catastrophic. The direct debit safety net is the single most important habit you can build.
Utilisation = (current balance) / (credit limit), aggregated across all your revolving credit. This includes credit cards and overdrafts. Under 30% looks responsible. Under 10% looks excellent. Over 75% is treated as a stress signal and costs significant points.
Two ways to lower utilisation:
One nuance: utilisation is calculated from the balance reported to the credit agencies, which is usually the statement balance. Paying off the statement balance just before the statement date can show £0 utilisation that month — a small score boost. This is fiddly and only worth doing if you're applying for credit imminently.
Each formal credit application leaves a hard search on your file for 12 months. Multiple hard searches in a short window suggest financial stress and cost points. The rule: no formal applications during the six months unless absolutely essential. Eligibility checkers (soft searches) are fine — they're invisible.
This includes "0% balance transfer" cards, store cards at the till, mobile contracts on a SIM-only switch (most use hard searches), and even some buy-now-pay-later providers (Klarna does soft search, Clearpay does hard search — check before clicking).
If you have a thin file (under 3 active accounts), one new account opened mid-plan can improve your score over the long run by adding to your credit mix and increasing total available credit. The trick: pick something low-friction and pay it on time religiously.
Options ranked roughly:
What not to do: open three cards in a single month, take a high-interest loan to "build credit," sign up for a credit-builder service that charges a fee for something you can do yourself.
By month 6, expected movement is typically 50–150 points if you started in the "Poor" or "Fair" bands. Smaller absolute movement if you started in "Good" because the curve is asymptotic.
Keep going on the basics — on-time payments, low utilisation, no unnecessary applications — and the score continues to improve gradually for another 12–18 months as the worst negative markers age out of the most-recent window lenders weigh.
Want to see how each change moves your simulated score? Open the credit score simulator.
Most agencies refresh files monthly when lenders report. Sustained behaviour change usually shows up clearly after 2–3 months. Headline events (a default falling off, a hard search expiring, a registration change) can appear in days.
Counter-intuitively, paying off and closing the card can lower your average account age and reduce total available credit, which raises utilisation on your remaining cards. Pay it off but keep it open, used for one £5/month purchase paid in full.
Only if you're financially linked — joint mortgage, joint loan, joint bank account. Marriage, cohabitation, and shared bills in one name don't link your files. Ask each agency for a free "financial association" check if you're not sure.
Set up direct debits for at least the minimum on every credit account. The safety net against missed payments is more valuable than any other single action.
This article is general information about UK personal finance. It is not regulated financial advice and Pennywise Finance is not authorised by the Financial Conduct Authority. For decisions involving large sums or complex situations, please consult an FCA-authorised adviser.