Which ISA is right for you?

Six short questions about your goal, time horizon, age, risk tolerance, and tax position. We return a recommended wrapper allocation with the reasoning shown, no product steering, no commission.

Question 1: What is the goal?

• Emergency fund (any horizon) → Cash ISA. Capital preservation matters more than return.
• First-home deposit (under £450k, within 5 years) → Lifetime ISA (if aged 18-39) for the 25% bonus, plus Cash ISA on top.
• Retirement supplement (10+ years away) → Stocks & Shares ISA primary, plus Lifetime ISA if eligible.
• Medium-term wealth (5-10 years) → Stocks & Shares ISA with conservative allocation.

Question 2: What is your time horizon?

Time horizon determines wrapper choice more than any other factor. Under 5 years → Cash ISA dominant. 5-10 years → balanced S&S ISA. 10+ years → S&S ISA dominant. 30+ years → S&S ISA exclusively (no rolling 30-year window in our 1985-2024 dataset has produced a real loss).

Question 3: What is your age?

The Lifetime ISA is restricted to UK residents aged 18-39 at the time of opening. Subscriptions can continue until age 50. Above age 50 the wrapper is locked-in for withdrawal at age 60+ or first-home purchase. Junior ISAs are for children under 18.

Question 4: What is your risk tolerance?

Stocks & Shares ISA returns vary materially year-to-year. The FTSE All-Share TR Index lost 30%+ in 2008 calendar year, then recovered within 18-36 months. If you cannot tolerate seeing your balance drop 30% temporarily, do not put your savings in a S&S ISA, use Cash ISA. If you can tolerate volatility, S&S ISA dominates over long horizons.

Question 5: What is your tax position?

Basic-rate taxpayers receive £1,000 Personal Savings Allowance on bank interest outside any wrapper. Higher-rate taxpayers receive £500. Additional-rate taxpayers receive £0. The Cash ISA is most valuable for higher-rate and additional-rate taxpayers; basic-rate savers may find their non-ISA interest already untaxed.

Question 6: Do you have a workplace pension?

If you have a workplace pension with employer matching, max the match before considering a Lifetime ISA for retirement. Workplace pension tax relief (40%+ at higher rates) typically beats the LISA 25% bonus for retirement-specific saving.

Use our interactive calculator to model your specific contribution + return + horizon scenarios. See the side-by-side comparison of all five wrappers. Read our full goal-mapped guide.