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.

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