Stocks and Shares ISA vs Cash ISA
Both ISAs let you save and invest up to £20,000 per year completely tax-free. The difference is what happens to the money inside.
The Core Difference
A Cash ISA holds your money in a savings account earning interest — predictable and safe. A Stocks and Shares ISA invests your money in the stock market — higher potential returns but with short-term volatility.
Long-Term Returns Comparison
With £10,000 initial investment and £500 per month contributions:
| Cash ISA at 5% | Stocks and Shares ISA at 7% | |
|---|---|---|
| 5 years | approximately £43,000 | approximately £47,000 |
| 10 years | approximately £86,000 | approximately £103,000 |
| 20 years | approximately £208,000 | approximately £310,000 |
Who Should Choose What?
Cash ISA: Money needed within three to five years. Cannot afford any loss of capital. Building an emergency fund or house deposit.
Stocks and Shares ISA: Investing for five or more years. Comfortable with short-term ups and downs. Building long-term wealth.
The Smart Approach
Have both. Keep three to six months of expenses in a Cash ISA as your emergency fund. Invest additional long-term savings in a Stocks and Shares ISA. This gives you both security and growth.
Stocks and Shares ISA figures are illustrative. Actual returns vary and your capital is at risk.