How Much Does a £10,000 Loan Actually Cost You? (The Real Number)
£192.86 a month and £237.90 a month look close. On a £10,000 loan, one of them costs £2,702 more overall. We calculated the real total repayable across best, average, and poor-credit rates — the monthly payment isn't the number that matters.
£192.86 a month and £237.90 a month look close enough to not matter. On a £10,000 loan, one of them actually costs £2,702 more over the life of the loan. The monthly payment is the number lenders lead with. The total repayable is the number that actually tells you what you're paying — here's what it looks like, calculated properly, across the rates people actually get offered.
Key Takeaways
On a £10,000 loan at the best available rate (5.9% APR) over 5 years, you'll pay £11,571.80 in total — £1,571.80 in interest.
At the current average rate (8.2% APR) over the same 5 years, the total rises to £12,223.35 — over £650 more, for the same amount borrowed.
At a typical "poor credit" rate (15% APR) over 5 years, total cost jumps to £14,273.96 — more than £2,700 above the best-rate scenario.
Term length matters as much as rate: keeping the same 5.9% rate but stretching from 2 years to 5 years more than doubles the total interest paid, from £626 to £1,572.
Two very different-looking offers — a lower rate over a longer term, and a higher rate over a shorter term — can end up costing almost exactly the same in total, despite very different monthly payments.
At a Glance — What £10,000 Actually Costs
Scenario
APR
Term
Monthly Payment
Total Repayable
Total Interest
Best available rate
5.9%
2 years
£442.76
£10,626.14
£626.14
Best available rate
5.9%
5 years
£192.86
£11,571.80
£1,571.80
Current average rate
11.4%
2 years
£467.94
£11,230.50
£1,230.50
Current average rate
8.2%
5 years
£203.72
£12,223.35
6 min read·September 18, 2026·1
Marcus Elliot
Writer
£2,223.35
Typical poor-credit rate
15%
3 years
£346.65
£12,479.52
£2,479.52
Typical poor-credit rate
15%
5 years
£237.90
£14,273.96
£4,273.96
Subprime rate
25%
3 years
£397.60
£14,313.54
£4,313.54
Figures calculated by standard loan amortisation. Rates reflect realistic 2026 UK ranges by credit tier — your actual offer depends on your specific credit profile.
The Monthly Payment Hides More Than It Reveals
Look at the bottom two rows of the table above: a "poor credit" 15% APR loan over 5 years costs £237.90 a month, and a "subprime" 25% APR loan over just 3 years costs £397.60 a month — a huge difference in monthly payment. Their total cost, though, ends up almost identical: £14,273.96 versus £14,313.54, less than £40 apart. Judging these two offers by monthly payment alone would make the 15% loan look dramatically cheaper. Judging them by total cost shows they're nearly the same deal, just structured differently. The monthly figure tells you what fits your budget today; the total repayable tells you what the loan actually costs you.
How Much Rate Alone Changes the Real Number
Holding the term fixed at 5 years, moving from the best available rate (5.9%) to the current average rate (8.2%) raises the total cost from £11,571.80 to £12,223.35 — an extra £651.55 for identical borrowing, purely from a 2.3 percentage point difference in rate. Moving further, to a typical poor-credit rate of 15%, pushes the total to £14,273.96 — over £2,700 more than the best-rate scenario. None of these borrowers received a different amount of money. The gap is entirely the cost of credit risk, priced into the rate.
How Much Term Alone Changes the Real Number
Now hold the rate fixed at the best available 5.9% and change only the term. Over 2 years, total interest is £626.14. Stretch the same rate over 5 years, and total interest rises to £1,571.80 — two and a half times more, despite an identical rate, simply because interest keeps accruing on a larger remaining balance for longer. This is the mechanism behind every "lower monthly payment, longer term" pitch: the monthly figure drops, but the total cost rises, and it can rise by more than the rate itself would suggest.
Why This Matters More Than the Advertised Rate
A lender advertising 5.9% APR is telling the truth about a real, available rate — but as covered in Best Personal Loans in the UK for 2026 (Compared), that rate is only guaranteed to at least 51% of approved applicants under FCA rules. Whatever rate you're actually offered, the number that tells you the real story isn't the APR in isolation — it's what that APR, combined with your specific term, turns into as a total repayable figure. Two loans advertised at rates that look close can diverge by thousands once term is factored in, and two loans that look completely different in monthly terms can cost almost the same overall.
What This Means for You
Before accepting any personal loan offer, calculate the total repayable at the specific rate and term you've actually been offered — not the advertised headline rate, and not just the monthly payment that fits your budget. A loan that feels affordable month to month can still be considerably more expensive in total than a shorter, higher-monthly-payment alternative, and the only way to know which is genuinely cheaper is to run the actual numbers.
💻 Run your own numbers: use our Loan Calculator to see the total repayable on your actual offer, not just the estimates above.
What You Should Do Next
Calculate the total repayable on any loan offer, not just the monthly payment
Compare offers at the same term where possible, so rate differences aren't hidden by term differences
If two offers have similar total costs but different terms, choose based on which monthly payment and timeline actually suits your situation
Check your credit report before applying, so you have a realistic sense of which rate tier you're likely to fall into
Never assume a lower monthly payment means a cheaper loan without checking the total
A £10,000 loan can cost anywhere from £10,626 to over £14,300 in total, depending entirely on the rate and term attached to it — a gap of nearly £3,700 on the exact same amount borrowed. The monthly payment tells you what leaves your account each month. The total repayable tells you what the loan actually costs. Always calculate the second number before signing anything, because the first one is designed to look manageable regardless of which deal you're looking at.
FAQ
Why do two loans with very different monthly payments sometimes cost about the same overall?
Because monthly payment reflects both the rate and the term — a lower rate over a longer term and a higher rate over a shorter term can produce similar total costs despite very different monthly figures. Total repayable, not monthly payment, is the number that reveals this.
Does extending a loan's term always cost more overall?
Generally yes, at the same interest rate — a longer term means interest accrues on the remaining balance for longer, which usually increases total interest paid even though the monthly payment drops.
What's a realistic APR range for a £10,000 personal loan in 2026?
Roughly 5.9% for the best available rates, around 8.2% for a typical average-credit 5-year loan, and 15%+ for borrowers with weaker credit profiles — your actual offer depends on your specific credit history and income.
How can I find the true cost of a loan before accepting it?
Use a loan calculator with the exact rate and term you've been offered to see the total repayable figure, rather than relying on the advertised rate or the monthly payment alone.
This article is for informational purposes only and does not constitute financial advice. Figures are calculated illustrative examples based on realistic 2026 UK rate ranges — your actual rate and total cost depend on your personal credit profile and the specific lender's terms.
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Marcus Elliot is a personal finance writer with over a decade of experience covering lending, credit, and consumer banking, helping everyday borrowers cut through lender jargon and make smarter borrowing decisions.
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