Quick answer
The most reliable comparison is total cost of credit: total interest plus any fees. APR is useful for comparing similar products over similar terms, but it can mislead when comparing products with different structures, fees, or terms. Always check: the representative APR versus your personalised rate, total repayable, any fees, early repayment charges, and whether the rate is fixed or variable.
What APR Actually Means
APR stands for Annual Percentage Rate. It expresses the annual cost of borrowing as a percentage, including the interest rate and any mandatory fees included in the calculation. It allows comparison between products on a standardised basis.
Key limitations to understand:
- Representative APR shows what at least 51% of successful applicants receive - not necessarily what you will be offered
- Your personalised APR may be higher if your credit profile is weaker
- APR is a rate, not a total cost figure - it tells you the annual rate, not the total amount you will repay
Total Cost of Credit: The Most Useful Number
Total cost of credit is the difference between the total amount you repay and the amount you borrow. It includes all interest and all mandatory fees.
Example: £10,000 borrowed, 5 years, 8.9% APR, no fees. Total repayable approximately £12,400. Total cost of credit: £2,400.
This is the number to compare across different lenders and products. A lender offering 7.9% APR with a £500 arrangement fee may cost more overall than one at 8.5% APR with no fee, depending on the loan amount and term.
Fees That Affect the True Cost
- Arrangement or product fees - common on mortgages (£999-£1,499 typical). Adding them to the loan increases interest paid over the term.
- Broker fees - some brokers charge a fee at completion. Confirm whether a broker is fee-free or not before proceeding.
- Early repayment charges (ERCs) - fixed-rate mortgages often charge 1-5% of the outstanding balance if repaid early within the deal period. Personal loans sometimes have exit fees expressed in months of interest.
- Valuation fees - on secured lending, the lender may charge for a property valuation.
- Late payment fees - charged if you miss a payment. These are a cost of credit if you anticipate any payment volatility.
Comparing Across Different Term Lengths
A lower monthly payment does not mean a cheaper loan. Stretching a loan over a longer term typically increases total interest significantly. Conversely, a shorter term increases monthly payments but reduces total cost. When comparing lenders, always compare on the same borrowing amount and term, then look at the monthly payment and total repayable side by side.
Fixed vs Variable Rate Costs
Fixed rate products lock your payment for the deal period, making budgeting straightforward. Variable rate products - including trackers and SVRs for mortgages - can rise or fall. Over the short term, variable rates are sometimes lower than equivalent fixed rates. Over the medium term, the outcome depends on base rate movements, which are not predictable. When comparing these product types, consider your personal risk tolerance alongside the current rate differential.
How to Compare Mortgages Properly
For mortgages, compare over the full deal period (not just the initial rate period):
- Calculate total cost during the deal period (monthly payment x deal term months) plus any arrangement fee
- Factor in what happens when the deal expires - SVR revert rates can add significantly to cost if you stay on them
- Compare total cost across different deal lengths (2-year vs 5-year) including estimated SVR exposure after each
Frequently Asked Questions
Regulations require lenders to advertise a representative APR that at least 51% of successful applicants receive. That means up to 49% of successful applicants receive a higher rate - potentially significantly higher - depending on their credit profile. The representative APR is a benchmark figure, not the rate you will necessarily be offered. Always check the rate in your personalised quote before accepting.
During the 0% promotional window, yes - there is no interest charged. But if you carry a remaining balance beyond that window, the revert rate (typically 20-30% APR) can be considerably higher than a personal loan rate. A 0% card is cheapest only if you clear the balance before the promotional period ends. Use a structured repayment plan, not minimum payments, if you are using a 0% card to manage a large purchase.
Not necessarily. If you are confident you will run the loan for the full term, early repayment charges are irrelevant. If there is a reasonable chance you will want to overpay or repay early - perhaps because you expect a bonus or an inheritance - then a lender with no ERC (or a lower one) is worth prioritising even if the rate is slightly higher. Calculate the total cost under both scenarios before deciding.
Multiply the monthly payment by the number of months and subtract the original loan amount to find total interest paid. For example: a £10,000 loan at 7% APR over 3 years costs roughly £1,100 in interest total. The same loan over 5 years at 8% APR costs roughly £2,200 in interest. The shorter-term loan is cheaper overall even at a lower rate, but the monthly payment is higher. Compare both the monthly affordability and the total cost when evaluating options.
Usually yes for the same loan amount and term, but not always. A lender with a slightly higher APR but no arrangement fee may be cheaper than a lender with a lower APR plus a significant upfront fee. This is especially true for mortgages, where product fees of £1,000+ can make a "lower rate" deal more expensive overall. Always calculate total cost of credit, not just the headline rate.
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