Credit & Debt
APR vs Interest Rate — What's the Difference?
Understanding APR and interest rates. How they're calculated, why they differ, and which to use when comparing loans, credit cards, and mortgages.
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3 min read
APR and interest rate are related but different. Understanding both helps you compare borrowing costs accurately.
Simple Explanation
Interest Rate
| What It Is |
Details |
| The base cost |
Of borrowing |
| Percentage |
Of amount borrowed |
| Doesn’t include |
Fees and charges |
| Sometimes called |
Nominal rate |
APR (Annual Percentage Rate)
| What It Is |
Details |
| Total cost |
Of borrowing |
| Includes |
Interest + fees |
| Standardised |
For comparison |
| Legal requirement |
To advertise |
Key Difference
| Element |
Interest Rate |
APR |
| Interest |
Yes |
Yes |
| Arrangement fees |
No |
Yes |
| Admin charges |
No |
Yes |
| Compounding effect |
Sometimes |
Yes |
| Best for comparison |
No |
Yes |
Why APR Matters
Same Interest, Different APR
| Loan A |
Loan B |
| Interest rate: 5% |
Interest rate: 5% |
| £500 arrangement fee |
No fees |
| APR: 6.2% |
APR: 5.0% |
| More expensive |
Cheaper |
What’s Included in APR
| Fee Type |
Included? |
| Interest |
Yes |
| Arrangement fee |
Yes |
| Application fee |
Yes |
| Compulsory insurance |
Yes |
| Early repayment fee |
No |
| Optional extras |
No |
Different Types of Loans
Personal Loans
| Rate Type |
What to Check |
| Interest rate |
Base rate offered |
| APR |
True cost |
| Representative APR |
What most get |
| Personal APR |
Your actual rate |
Representative vs Personal APR
| Representative APR |
Personal APR |
| Advertised rate |
Your actual rate |
| 51%+ get this |
May be higher or lower |
| Good credit scenarios |
Based on your assessment |
| Starting point |
Final figure |
Example Variation
| Applicant |
APR Offered |
| Excellent credit |
5.9% |
| Good credit |
7.9% |
| Average credit |
12.9% |
| Poor credit |
Declined or very high |
| Representative |
5.9% (majority got this) |
Mortgages
Mortgage Rate Types
| Term |
Meaning |
| Initial rate |
Rate during fixed/tracker period |
| SVR |
Standard variable rate after |
| APRC |
APR for mortgages |
| Overall cost |
What you pay total |
APRC Explained
| APRC Includes |
Example |
| Interest (whole term) |
All years at different rates |
| Product fee |
£999 arrangement fee |
| Valuation fee |
If compulsory |
| Booking fee |
If charged |
| Other mandatory |
Required costs |
Why Mortgage APR Looks Different
| Scenario |
Impact |
| 2-year fix at 4% |
Then SVR at 8% |
| APRC reflects |
The higher SVR too |
| May look high |
But includes worst case |
| Compare |
Initial rates separately |
Credit Cards
Credit Card APR
| Type |
Rate |
| Purchase APR |
On spending |
| Cash APR |
On withdrawals (higher) |
| Transfer APR |
On balance transfers |
| Default APR |
If you miss payments |
Typical Credit Card APRs
| Card Type |
APR Range |
| Rewards/premium |
18-25% |
| Standard |
20-24% |
| Poor credit |
30-50% |
| 0% promotional |
Then reverts to standard |
Why Credit Card APR Is High
| Reason |
Explanation |
| Unsecured |
No collateral |
| Higher risk |
Lender exposed |
| Flexible |
Borrow any amount |
| Convenience |
Pay for it |
Does APR Matter for Credit Cards?
| How You Use It |
APR Importance |
| Pay in full monthly |
APR irrelevant |
| Carry balance |
APR very important |
| 0% deal ending |
Check reversion rate |
Calculating Cost
Simple Interest Example
| Borrow £5,000 |
1 Year |
| Interest rate 6% |
£300 interest |
| Total repay |
£5,300 |
| True cost |
£300 |
With Fees Example
| Borrow £5,000 |
1 Year |
| Interest rate 5% |
£250 interest |
| Arrangement fee |
£100 |
| Total repay |
£5,350 |
| Effective APR |
7% |
Monthly Compounding
| Factor |
Impact |
| Interest calculated |
Monthly not annually |
| Compounds |
Interest on interest |
| APR accounts |
For this effect |
| Nominal vs effective |
Different calculation |
Using APR to Compare
Like-for-Like Comparison
| Loan Offer |
APR |
| Bank A |
7.2% |
| Bank B |
6.8% |
| Bank C |
7.5% |
| Best value |
Bank B |
What APR Doesn’t Show
| Factor |
APR Includes? |
| Early repayment charges |
No |
| Flexibility |
No |
| Customer service |
No |
| Overpayment options |
No |
Beyond APR
| Also Consider |
Why |
| Can you overpay? |
Reduce interest |
| Flexible payments? |
Miss occasionally |
| Repayment term |
Total interest |
| Total repayable |
Actual cost |
Special Cases
0% APR Offers
| Offer Type |
How It Works |
| 0% purchase |
No interest for period |
| 0% transfer |
On balance moved |
| After promotional |
Reverts to standard |
| Read small print |
Always |
Hire Purchase
| APR vs Flat Rate |
Difference |
| Flat rate |
Simple % on original amount |
| APR |
Accounts for reducing balance |
| 5% flat |
≈ 10% APR |
| Always compare |
Using APR |
Overdrafts
| Post-2020 |
Rules |
| Single APR |
Required |
| No daily/monthly fees |
Just APR |
| Easier to compare |
With loans |
| Typically 35-40% |
APR |
Summary
| Term |
Use For |
| Interest rate |
Basic understanding |
| APR |
Comparing borrowing |
| APRC |
Comparing mortgages |
| Representative APR |
What you might get |
| Personal APR |
Your actual rate |
| Key Rule |
Always… |
| Compare APRs |
Not just interest rates |
| Check what’s included |
Fees matter |
| Look at total repayable |
Full cost |
| Read terms |
For hidden costs |