Numbers Don't Lie
Everything nobody taught you about credit, interest, debt and the number on the screen
My Experian credit score is 1250.
That is not a typo, and it is not the old scale. Experian retired the 0–999 range and moved everyone to a 0–1250 scale, rolled out from Autumn 2025. On the new bands, 1121–1250 is "Excellent." So 1250 is the ceiling. There is nowhere higher to go.
I also carry six figures of debt.
Read those two sentences again, because most people think they cancel each other out. They don't. They're the same sentence. The score isn't high despite the debt — it's high because of how the debt is handled.
That's the whole lesson, and everything below is the working out.
But I'm going to be straight with you before we start, because a half-told version of this story is dangerous. "Six figures of debt, stress-free, it's just a number on a screen" is only true under conditions. Specific ones. Miss those conditions and the exact same sentence becomes the last thing someone tells themselves before it all comes down. I'll spell those conditions out properly in Part 9. Don't skip it.
Let's go.
Part 1: The rules exist whether you read them or not
You left school knowing the algebra and not knowing what APR stands for.
That's not an accident and it's not a conspiracy — it's just a gap. But the gap costs money. Every single day you operate inside a financial system you were never handed the manual for, and the system does not slow down for you. Interest accrues while you sleep. Direct debits leave whether you looked or not. A missed payment logs on your file whether you meant it or not.
Pressure is a privilege — but only if you know what's pressing.
So here's the manual.
The foundation: know your number
Before credit cards, before mortgages, before any of it — there's one figure that governs everything:
Money in, minus money out.
Not what you think you spend. What actually leaves. Open your banking app, go back three months, and add it up properly. Almost everyone is wrong by a few hundred pounds a month, and almost always in the same direction.
Three buckets:
Bucket | What's in it | Reality check |
Fixed | Rent/mortgage, council tax, utilities, insurance, phone, debt repayments | You can't cut these this month. You can renegotiate them this quarter. |
Variable | Food, fuel, transport | You control these more than you think, but not to zero. |
Discretionary | Everything else | This is where the money actually goes. |
If money in minus money out is negative, nothing else in this article matters yet. Fix that first. Everything downstream — investing, leverage, business borrowing — is built on a positive number here.
Part 2: Interest — the engine that runs everything
Every product in this article is the same product wearing different clothes. Somebody lends you money. You pay for the time you hold it. That price is interest.
Understand interest and you understand credit cards, mortgages, car finance, loans and savings all at once.
Simple vs compound
Simple interest is charged on the original amount only. £1,000 at 10% simple = £100 a year, every year. Boring, predictable, rare.
Compound interest is charged on the original amount plus the interest already added. That's when it gets interesting — in both directions.
£1,000 at 10% compound:
Year 1: £1,100
Year 5: £1,610
Year 10: £2,594
Year 20: £6,727
Nothing was added. It just kept earning on itself.
Compounding is either the most powerful ally you'll ever have or the quietest enemy. It depends entirely on which side of it you're standing.
The Rule of 72
Quick mental maths: divide 72 by the interest rate to find out how many years until the amount doubles.
At 3%: 24 years
At 7%: about 10 years
At 12%: 6 years
At 24% (a typical credit card): 3 years
Sit with that last one. Money you owe on a credit card, left alone, roughly doubles every three years.
APR, AER, APRC — decode the acronyms
APR (Annual Percentage Rate) — what borrowing costs you per year, including compulsory fees. Used for credit cards, loans, car finance.
Representative APR — the advertised rate. Lenders only have to give this to 51% of accepted applicants. Half of successful applicants can be offered worse. Advertised rates are a marketing number, not a promise.
AER (Annual Equivalent Rate) — the savings-side equivalent, accounting for compounding.
APRC — the mortgage version, showing the cost across the whole term including what happens after the fixed deal ends.
Where rates come from
The Bank of England base rate is the anchor. It's what the Bank charges commercial banks. Everything else prices off it, with a margin.
As of 30 July 2026, the base rate is 3.75% — held for the fifth consecutive meeting, with three MPC members voting to raise it to 4%. Inflation sits at 2.6% against a 2% target.
But here's a detail most people miss: fixed mortgage rates don't track the base rate. They price off swap rates — the wholesale cost to lenders of borrowing money for a fixed period. That's why in July 2026 mortgage rates rose while inflation fell. If you're waiting for a base rate cut to fix your mortgage, you may be watching the wrong number.
Part 3: Credit cards — the most misunderstood product in Britain
A credit card is not free money. It's a short-term loan with an outstanding feature that almost nobody uses properly.
The grace period — the feature that makes cards free
Buy something on a credit card and you get an interest-free window between the purchase and your statement due date — typically up to 56 days.
Clear the statement balance in full by the due date and you pay zero interest. Not "minimum payment." Not "most of it." In full.
Do that consistently and a credit card is genuinely free credit, plus purchase protection, plus a growing credit history. Used this way it's one of the best deals in personal finance.
Pay £1 less than the full balance and, on many cards, the grace period collapses and interest is charged from the transaction date.
What it actually costs when you don't
Credit card interest compounds daily.
UK averages as of mid-2026: the average representative APR on new cards hit 35.9% (Moneyfacts, May 2026) — the highest on record. The average rate actually being paid on outstanding balances is lower, around 24–25%, because many people hold older or promotional cards.
Let's do the maths that the industry would rather you didn't.
£3,000 balance at 24.9% APR, paying only the minimum (a typical formula: 1% of the balance plus that month's interest, with a £5 floor):
Time to clear: roughly 23 years
Interest paid: roughly £5,100
Total repaid: over £8,100 on a £3,000 spend
Same £3,000, same 24.9% APR, paying a fixed £150 a month:
Time to clear: 26 months
Interest paid: roughly £795
Same debt. Same rate. One decision. A difference of about £4,300 and twenty-one years.
The minimum payment is designed to be affordable. It is not designed to get you out.
The rules that cost people money
Cash withdrawals have no grace period. Interest starts on day one, usually at a higher cash rate, plus a fee of around 3%. Never take cash out on a credit card.
0% purchase and 0% balance transfer deals are real tools — but a balance transfer normally carries a fee of 3–4% of the amount moved, and when the promotional period ends the rate reverts to something like 24.9%. Set a calendar reminder for one month before it ends. Every time.
Credit utilisation matters. That's the percentage of your limit you're using. Experian's own guidance is to keep it under 30%. £3,000 limit means keeping the balance under £900 if you want the score benefit.
Never withdraw cash, never miss a payment, never carry a balance you didn't plan to carry. Everything else is detail.
Now, you could actually live on credit cards, year by year, paying the minimum back each month — followed by a balance transfer at the end of the term. A full manipulation of the credit system.
And with credit cards, get an American Express! I can send you my referral :)
Part 4: Your credit score — what it is and what it isn't
This is where the myths live, so let's clear them out.
There is no single credit score.
There are three credit reference agencies in the UK, each with its own scale:
Agency | Range | Free access via |
Experian | 0 – 1250 | Experian app |
Equifax | 0 – 1000 | ClearScore |
TransUnion | 0 – 710 | Credit Karma |
Comparing them directly is like comparing Celsius to Fahrenheit. Different scales, different algorithms, and lenders don't all report to all three.
The Experian bands (new 0–1250 scale)
Band | Range |
Excellent | 1121 – 1250 |
Very Good | 1001 – 1120 |
Good | 861 – 1000 |
Fair | 641 – 860 |
Low | 0 – 640 |
If you last checked your score a while ago and it looks like it dropped, that may be the rescale, not you. Check the band, not just the number.
The bigger truth: lenders don't use your score. This is the part almost nobody knows.
The score you see in an app is an educational score. When you actually apply for a mortgage or a credit card, the lender doesn't look at it. They run their own internal scoring model on the raw data in your credit report, combined with your application form and any history they already hold on you.
So a lender's decision depends on things your app score can't see — your income, your job stability, your deposit, their appetite for risk that quarter, and their own criteria.
Your score is a mirror, not the thing itself. The report underneath is the thing. Chase clean data, not a number.
What actually moves it
In rough order of weight:
Payment history. Paying the agreed amount, on the agreed date, every time. This is the single biggest factor. Not how much you owe — whether you keep your word.
Credit utilisation. Under 30% of your available limits.
Electoral roll registration. Not being on it is an instant fraud-risk flag. It's free. Do it today.
Length of credit history. Age of accounts helps. Closing your oldest card can hurt.
Hard searches. Each formal application logs one. Cluster too many and you look desperate. Use eligibility checkers (soft searches) first — they don't affect your score.
Defaults, CCJs, IVAs, bankruptcy. These stay for six years. One critical exception: pay a CCJ in full within 28 days of judgment and it can be removed entirely, not just marked satisfied. Miss that window and it sits there for six years.
Myths
Checking your score lowers it. No. That's a soft search. Check it monthly.
There's a national debt blacklist. There isn't.
Your salary is on your credit report. It isn't. Lenders ask you separately.
Being debt-free means a great score. Often the opposite. No credit history means no evidence. Lenders can't score what they can't see. A "thin file" is a real problem for first-time buyers.
Your partner's bad credit infects yours. Only if you're financially linked — a joint account, joint mortgage, or joint loan. Living together isn't a link. Sharing a bank account is. If you separate, file a notice of disassociation with the CRAs.
All myths, just lies.
Part 5: Loans — the honest middle ground
A personal loan is simpler than a card: a fixed sum, a fixed rate, a fixed term, a fixed monthly payment. No temptation to redraw, no minimum-payment trap.
Unsecured means it's backed by your promise alone. Higher rates, but they can't take your house.
Secured (a homeowner loan or second charge) means it's backed by your property. Lower rates — because if you don't pay, they can repossess. Never convert unsecured debt into secured debt without understanding exactly what you've just put on the table.
Loan vs card, same amount
£10,000 over 5 years at 7.9% APR:
Monthly: about £201
Total interest: about £2,060
£10,000 on a credit card at 24.9% APR, paying £200 a month:
Time to clear: over 12 years
Total interest: roughly £19,500
Nearly the same monthly payment. Almost ten times the interest. In month one of that card, £187 of your £200 goes to interest and £13 touches the debt.
Structure beats intention.
Things to check on any loan
Early repayment charges. UK consumer credit rules cap the penalty at around 58 days' interest, but check.
Whether the APR is guaranteed or representative. Get a soft-search quote first.
Total amount repayable — not the monthly payment. Lenders lengthen terms to make monthlies look small. A longer term always costs more overall.
Part 6: Car finance — where the most money quietly disappears
Cars are where good earners go broke, because the industry sells you a monthly payment instead of a price.
The three structures
Hire Purchase (HP) — you borrow the full price, pay it down over the term, own it at the end. Higher monthly, lowest total interest.
Personal Contract Purchase (PCP) — you pay a deposit, then monthly payments that only cover the car's depreciationover the term, with a large balloon payment (the Guaranteed Minimum Future Value) at the end. At the end you either pay the balloon, hand the car back, or roll into a new deal. Lower monthly, higher total interest.
Leasing / PCH — pure rental. You never own it. Cheapest monthly, zero equity.
The numbers, laid bare
£25,000 car, £2,500 deposit, 48 months, 9.9% APR, £9,000 balloon (PCP):
Monthly: about £410
Paid over four years including deposit: about £22,200
If you hand it back: you own nothing. You have spent £22,200 to use a car for four years.
If you buy it: total £31,200 for a £25,000 car — about £6,200 in interest.
Same car, same deposit, same rate, on HP over 48 months:
Monthly: about £565
Total paid: about £29,600
Interest: about £4,600
And you own a car worth roughly £9,000.
The PCP has the smaller monthly payment and the larger total interest bill — because you're carrying a big outstanding balance for the entire term instead of paying it down.
Lower monthly payment does not mean cheaper. It almost never does.
The trap that catches people
The dealer calls at month 36 and offers to "roll you into a new car for the same monthly payment." What's usually happening is that any equity above the balloon is being used as the deposit on the next car. It feels like a reward. It's a treadmill — and the moment your car is worth less than the balloon, you have negative equity that gets rolled forward into the next agreement, invisibly.
Also watch: mileage limits with excess charges per mile, and "fair wear and tear" inspections on return.
The honest framing
A car is a depreciating asset. It loses roughly 15–35% in year one and around half its value in three years. Finance on a depreciating asset means you're paying interest on something that's actively getting less valuable. Sometimes that's a perfectly rational trade — you need reliable transport, your time is worth something, a warranty has value. Just make it a decision, not a drift.
Part 7: Mortgages — the biggest number of your life
As of late July 2026 (Moneyfacts data):
Average 2-year fix: around 5.6%
Average 5-year fix: around 5.6%
Average Standard Variable Rate (SVR): around 7.1%
Best deals at low LTV: 2-year fixes around 4.3%, 5-year around 4.5%
That gap between the best deals and the averages is the single most profitable thing in this article.
Loan to Value (LTV) — the number that sets your rate
LTV is the loan as a percentage of the property value. £200,000 borrowed on a £250,000 house is 80% LTV.
Rates step down in bands — usually 95%, 90%, 85%, 80%, 75%, 60%. Crossing a band is worth more than almost anything else you can do. If you're at 81% LTV, finding a way to get to 80% before you apply can be worth thousands.
Fixed, tracker, variable
Fixed — your rate is locked for 2, 5 or 10 years. Certainty. Early repayment charges if you leave early.
Tracker — follows the base rate plus a set margin. Falls when the base rate falls, rises when it rises.
SVR — the lender's own rate, which they can change at will. This is what you fall onto when your deal ends, and it's the most expensive place to be. Never sit on an SVR by accident. Start looking six months before your deal ends.
What a mortgage actually costs
£250,000 over 25 years at 5.5%:
Monthly: about £1,535
Total repaid: about £460,500
Interest: about £210,500
You borrow £250,000 and hand back £460,500. That's the deal, and it's not a scandal — it's the price of twenty-five years of somebody else's capital. But you should know it.
The same mortgage at 4.5%:
Monthly: about £1,390
Interest: about £167,000
One percentage point is worth roughly £43,500. Half a day with a broker is the best-paid work you will ever do.
The two levers that change everything
1. Term length. A 30-year term instead of 25 lowers the monthly payment and dramatically raises the total interest. A 20-year term does the opposite. Lenders default to showing you the longer term because the monthly looks better.
2. Overpayments. Most fixed deals let you overpay 10% of the balance per year penalty-free. Every overpaid pound goes straight at the capital, which kills the interest that pound would have generated for the rest of the term.
On that £250,000 at 5.5%: overpaying £150 a month clears it roughly four years early and saves around £40,000 in interest.
£150 a month. £40,000. That's the entire game.
Don't forget
Stamp duty, solicitor fees, survey, broker fee, product fee (often £999–£1,499, and adding it to the loan means paying interest on it for the whole term), buildings insurance, and — if you're above the standard LTV thresholds — the reality that the deposit is the hardest part and the part nobody can shortcut for you.
Part 8: "You have to borrow money to make money"
A personal quote I recycle in any financial conversation.
Here's where I part company with the standard advice, and here's where I need to be precise, because this idea is true and it is also the sentence that has ruined more people than any other.
The principle: leverage
Leverage means using borrowed capital to control an asset larger than your own money could reach. It's how essentially every business, every property portfolio and every large enterprise on earth is built.
The maths is simple:
If the return on the asset exceeds the cost of the debt, leverage makes you money. If it doesn't, leverage makes you poor — faster than you could have managed on your own.
Borrow £100,000 at 8% — that's £8,000 a year. Deploy it into something returning 15% — that's £15,000. You've made £7,000 using capital that was never yours.
Deploy it into something returning 4% and you've lost £4,000 a year, on money you still owe in full.
Leverage is a multiplier, and multipliers work on negative numbers too.
Good debt vs bad debt — the real distinction
It isn't the product. It's the answer to three questions.
1. Does it produce income or acquire an appreciating asset? A loan that buys equipment, stock, a qualification, a property that yields rent, or advertising that returns more than it costs — that debt is buying you a future income stream. A loan that buys a holiday, a sofa or a night out is buying you a memory. Memories are worth having. They're just not investments, and you shouldn't finance them at 35.9% APR.
2. Can you service it from existing income if the plan fails completely? This is the question that separates entrepreneurs from casualties. Not "will this work" — you always think it'll work. "What happens to me if it doesn't?"If the answer is "I lose my home," the debt is too big regardless of how good the opportunity looks.
3. Is the cost of capital comfortably below the return you're genuinely confident of? Not the return in your best-case spreadsheet. The one you'd bet your own money on.
Pass all three and it's productive debt. Fail any one and it's a liability wearing a suit.
The uncomfortable version
The people posting "good debt vs bad debt" on Instagram usually skip the part where good debt still has to be paid. A mortgage on a rental property is good debt right up until the tenant leaves for four months. Business borrowing is good debt right up until a client doesn't pay.
Productive debt isn't safe debt. It's justified debt. There's a difference, and the difference is whether you've priced in the version where it goes wrong.
Part 9: My numbers — 1250 with six figures owed
So: maximum credit score, six figures of debt, and I sleep fine.
Here's why that's consistent, and here's the honest anatomy of it.
Why the score is high. Credit scoring measures one thing above all others: do you do what you said you'd do, on the day you said you'd do it? It is a reliability score, not a wealth score. Every payment I've agreed to make, I've made, on time, in full. Years of that. The size of the debt matters far less to the algorithm than the perfection of the repayment record. Lenders aren't scared of people who owe a lot. They're scared of people who don't pay.
Six figures owed with a flawless record reads as proven. Two thousand owed with three missed payments reads as risky. That's not a loophole — that's the entire logic of credit.
Why it's stress-free. Not because I'm relaxed about it. Because of structure:
Every pound of it is priced — I know the rate on every facility, to the decimal.
Every pound is purposed — it bought something that produces, not something that consumes.
Every pound is serviced from income that exists now, not income I'm hoping for.
Every payment is automated, so my discipline is never the point of failure.
I know my total monthly service cost and what percentage of income it represents, and I know the number at which I'd stop.
Every pound on credit card gains me a point, which can be spent on the rewards programmes.
That's what turns a frightening figure into a line item. It's a number on a screen because I put it there deliberately, I can see all of it, and I've already decided what I'd do if it moved against me.
And now the part I won't leave out
"It's just a number on a screen" is a conclusion, not a strategy.
I've earned that sentence. It's the output of years of structure. If you take it as an input — if you read it and think right, debt doesn't matter — you will get hurt, and I'd rather lose the punchline than have that on my conscience.
The same six figures becomes a crisis the moment any of these is true:
The debt bought consumption, not production
You're servicing it from projected income rather than actual income
You don't know your rates
You're using new credit to service old credit
You'd be unable to pay if one income source stopped for three months
You've stopped opening the statements
That last one is the real signal. Debt you can look at directly is managed. Debt you avoid looking at is managing you.
If you're reading this and you recognised yourself in that list, the honest and useful thing I can tell you is that free, confidential, non-judgmental debt advice exists in this country and it is genuinely good.
StepChange, National Debtline, Citizens Advice and MoneyHelper cost nothing and don't sell you anything. Using them is a strength move, not a defeat. I'd make that call the same week.
Pressure is a privilege. Pressure you can't see or feel isn't pressure — it's a blind spot.
Part 10: The order of operations
If you do nothing else, do these, in this order.
Know your number. Money in minus money out, from three months of real statements.
Register on the electoral roll. Free. Today. Instant credibility with lenders.
Build a rainy day pot. £1,000 first. It stops small emergencies becoming credit card balances.
Take the full employer pension match. Auto-enrolment is 8% total — 3% from your employer, 5% from you including tax relief. Not taking a match is declining a pay rise. Pay more to keep yourself below the higher tax threshold if you need to.
Kill high-interest debt. Anything above roughly 8–10% APR. Attack the highest rate first (cheapest overall) or the smallest balance first (best for momentum). Both work. The one you'll actually stick to is the right one.
Build a real emergency fund. Three to six months of essential outgoings, in instant access.
Then invest. Use your ISA allowance — £20,000 for 2026/27. Note the change coming: from 6 April 2027, under-65s will be limited to £12,000 into a Cash ISA per year, though the overall £20,000 allowance stays and the Stocks & Shares limit is unaffected. If you were planning to use a large cash allowance, this tax year is the last full one under the old rules.
Then leverage — carefully. Only once 1–7 are solid. Only against the three questions in Part 8.
The thing about starting early
£200 a month at a 7% average annual return:
Over 20 years: about £104,000 (you paid in £48,000)
Over 30 years: about £244,000 (you paid in £72,000)
Ten extra years cost you £24,000 in contributions and returned about £140,000.
Compounding doesn't reward the clever. It rewards the early. That's the only unfair advantage available to someone with no money — and it expires quietly, a day at a time.
Quick reference glossary
Term | Meaning |
APR | Annual cost of borrowing, including compulsory fees |
Representative APR | Advertised rate — only 51% of accepted applicants must get it |
AER | Annual Equivalent Rate — the savings-side equivalent |
Base rate | Bank of England rate; 3.75% as of 30 July 2026 |
Balloon payment / GMFV | The large final payment on a PCP |
CCJ | County Court Judgment — 6 years on file, removable if paid within 28 days |
Credit utilisation | % of your credit limit in use — keep under 30% |
Default | Account closed by lender after repeated missed payments — 6 years on file |
Equity | Asset value minus what you owe on it |
Hard search | Formal credit application — visible to lenders, affects score |
LTV | Loan to Value — loan as % of property value |
Negative equity | Owing more than the asset is worth |
Soft search | Eligibility check — invisible to lenders, no score impact |
SVR | Standard Variable Rate — the expensive default after a fixed deal ends |
Swap rates | Wholesale borrowing costs that actually drive fixed mortgage pricing |
The last word
Money isn't complicated. It's just unexplained. This should be a mandatory class in schools in my opinion, however the teacher has to have their own personal finances and knowledge at their subject level - not always the case.
Every product in this article runs on the same handful of mechanics: someone lends, you pay for the time, and the rate decides whether that's a bargain or a burden. Once you can see the mechanics, the fear goes — not because the numbers get smaller, but because they stop being mysterious.
A high credit score isn't a reward for being rich. It's a receipt for being reliable.
Six figures of debt isn't brave and it isn't reckless. It's a tool, and like every tool it depends entirely on whether the person holding it knows what it's for.
Learn the rules. Do what you said you'd do, on the day you said you'd do it. Borrow only for things that build. Look at the numbers even when you don't want to — especially when you don't want to.
Then it really is just a number on a screen.
CAYCOG | caycog.org | @caycogltd
Important: This article is educational and reflects personal experience — it is not regulated financial advice, and I'm not a financial adviser. Everyone's circumstances differ. For advice specific to you, speak to an FCA-regulated adviser or mortgage broker. I can help with general advice. All rates and figures are illustrative and correct as of August 2026; rates change constantly, so always check current figures before acting.
If debt is causing you stress, free and confidential help is available: StepChange, National Debtline, Citizens Advice, and MoneyHelper. They are free, they don't judge, and they don't sell you anything.
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