Many investors dream of a portfolio that delivers £10,000 a year in passive income. With a consistent approach to Individual Savings Accounts (ISAs), this goal may be more attainable than expected, thanks to tax benefits.
A cash ISA currently offers interest rates up to around 4.3%, meaning you would need about £250,000 to earn £10,000 in interest. However, rates fluctuate and can fall to near zero, making interest alone unreliable for long-term income. Withdrawing £10,000 annually from a £250,000 cash ISA with no interest would deplete the fund in 25 years. Additionally, the cash ISA annual allowance is set to be cut to £12,000, slowing accumulation.
A stocks and shares ISA can generate income through dividends, bond interest, and capital gains. While gains are not strictly passive, they can be withdrawn as income. Historically, a diversified portfolio returns 6–8% on average, but returns vary year to year. The 4% rule suggests you can withdraw 4% of your portfolio annually without exhausting it, meaning you need £250,000 to safely withdraw £10,000 each year.
With the current £20,000 annual ISA allowance, contributing the maximum each year could see you reach £250,000 by 2037, assuming average growth. For most, regular smaller contributions are more realistic. For example, investing £1,000 a month at 6% growth would take about 13 years, while £300 a month would take around 26 years. The power of compounding means patience multiplies your returns.
The key is to choose a diversified portfolio aligned with your risk appetite and stay invested through market fluctuations. A 'set and forget' approach, with annual reviews, has historically delivered better results for most investors.
