Financial IQ Test UK 2026: Measure Your Financial Literacy

Lusardi (Wharton) and Mitchell (Harvard) created the global standard for measuring financial literacy. In the UK: only 18% of adults can answer all three Lusardi-Mitchell "Big Three" questions correctly according to OECD/INFE data.

The UK ranks middle among developed economies — better than Italy or Spain but behind Germany, Netherlands, Sweden.

Why financial IQ matters

People with high financial IQ are 3.2x more likely to have an emergency fund, accumulate 4.7x more wealth by 50 (controlling for income), suffer 68% less debt overload, make 2.4x better investment decisions.

Financial IQ predicts financial success better than salary level.

The 10 essential concepts (UK context)

1. Compound interest
2. Inflation
3. Diversification
4. Bank of England base rate
5. ISA, LISA, SIPP, workplace pension
6. Debt overload (DSR)
7. Investment products (index funds, ETFs UCITS, FTSE)
8. Credit reference agencies (Experian, Equifax, TransUnion)
9. Credit cards (minimum payment trap)
10. Rule of 25

The 3 zones

Basic IQ (52%) | Intermediate IQ (30%) | Advanced IQ (18%)

Compound interest — the most underused concept

UK example: £10,000 at 7% for 30 years: - Simple interest: £31,000 - Compound interest: £76,123

Difference: £45,123. Time beats amount.

How to raise your IQ in 90 days

Month 1: Foundations

• Read "Smarter Investing" by Tim Hale
• Subscribe to Monevator newsletter
• BBC "Money Box" Radio 4

Month 2: Application

• Calculate DSR
• Calculate FI number
• Audit subscription leaks

Month 3: Deepening

• Open S&S ISA at Vanguard UK or HL
• Understand pension salary sacrifice
• Read Bogleheads UK guidance

Resources

• MoneyHelper: free guidance
• FCA ScamSmart
• Money to the Masses: Damien Fahy

Based on Lusardi-Mitchell methodology + OECD/INFE UK data.