What an ISA gives you
An ISA shelters your savings or investments from tax on interest, dividends and gains, up to an annual allowance. The best ISA depends on what you're saving for and when you'll need the money — there's no single winner, and you can split your allowance across types.
1. Cash ISA
Tax-free interest on savings, with easy-access or fixed-rate options. Best for short-term goals, emergency funds, or money you can't risk. Safe and simple, though returns may lag inflation over time.
2. Stocks & shares ISA
Invest in funds, shares and bonds with all growth and income tax-free. Best for goals five+ years away where you want higher potential returns and can accept ups and downs. The workhorse for long-term tax-free investing.
3. Lifetime ISA (LISA)
For 18–39-year-olds, with a 25% government bonus on contributions (up to a yearly limit), for a first home or retirement. Best for first-time buyers saving a deposit or younger savers for retirement — but withdrawals for other purposes carry a penalty.
4. Cash vs stocks & shares — matching to time
The key choice is time horizon: cash for short-term and safety, stocks & shares for long-term growth. Best practice is to keep short-term money in cash and longer-term money invested, rather than forcing one to do both jobs.
5. Splitting your allowance
You can pay into more than one type of ISA in a tax year (within the overall allowance). Best for those with both short- and long-term goals — e.g. some in cash for emergencies, some in stocks & shares for growth.
Which is best for you?
- Short-term/safety: cash ISA
- Long-term growth: stocks & shares ISA
- First home or under-40 retirement saving: Lifetime ISA
- Multiple goals: split your allowance
How to find the best ISA strategy
A qualified adviser can help you use your allowance efficiently across the right ISA types for your goals. Find an investment adviser through Nesto — free, no obligation.
Frequently asked questions
What's the best type of ISA?
It depends on your goal — cash for short-term and safety, stocks & shares for long-term growth, a Lifetime ISA for a first home or under-40 retirement saving.
Can I have more than one ISA?
Yes — you can pay into different types in the same tax year, within the overall annual allowance.
Is a cash or stocks & shares ISA better?
Cash suits short-term money and safety; stocks & shares suits long-term growth. Match the type to your time horizon.
How does a Lifetime ISA bonus work?
The government adds 25% to what you pay in (up to a yearly limit) for a first home or retirement. Other withdrawals carry a penalty.
Are ISAs really tax-free?
Yes — no tax on interest, dividends or capital gains within an ISA, and nothing to declare.