How much would I need in an ISA to earn a £1,000 monthly passive income?

The exact amount needed for a healthy passive income may depend greatly on the type of ISA an individual uses. Royston Wild explains.

| More on:

The content of this article was relevant at the time of publishing. Circumstances change continuously and caution should therefore be exercised when relying upon any content contained within this article.

A senior man and his wife holding hands walking up a hill on a footpath looking away from the camera at the view. The fishing village of Polperro is behind them.

Image source: Getty Images

You’re reading a free article with opinions that may differ from The Motley Fool’s Premium Investing Services. Become a Motley Fool member today to get instant access to our top analyst recommendations, in-depth research, investing resources, and more. Learn More.

Individual Savings Accounts (ISAs) are brilliant financial products for saving and investing. By eliminating tax obligations, they can significantly improve someone’s chances of generating a healthy passive income.

However, with Cash ISA interest rates coming down, things are becoming more challenging for people planning for retirement.

I own one of these cash-based products. But I also own a Stocks and Shares ISA. And looking ahead, I think buying shares, funds, and trusts in one of these ISAs might be the better way to consider targeting a robust passive income.

Please note that tax treatment depends on the individual circumstances of each client and may be subject to change in future. The content in this article is provided for information purposes only. It is not intended to be, neither does it constitute, any form of tax advice. Readers are responsible for carrying out their own due diligence and for obtaining professional advice before making any investment decisions.

How much will I need?

It’s tough to know how much each of us will need to live on in retirement. The rising cost of living, along with uncertainty over the size and eligibility rules of future State Pension benefits, mean many of us could be putting away too much, or not enough, each month.

But it’s good to have a ballpark figure in mind. Let’s say, for instance, that someone is targeting a second income of £1,000 on top of their future State Pension.

This sort of figure could provide them with a decent standard of living in retirement. To achieve this, they’d need £300,000 in their ISA by the time they finished work.

That’s based on drawing down 4% of this amount each year. This drawdown rate would provide them with a passive income for roughly 30 years before their pot ran dry.

Getting to work

Unfortunately, achieving this goal could be tough with a Cash ISA. Based on the best-paying easy-access ISA currently available from Moneybox, it’d cost them a sizeable £504 a month over 25 years to hit this target.

That’s based on a 5% interest rate. But there’s danger with using this figure as a guide.

As I say, interest rates are falling again, meaning an individual may have to make even more regular investments to eventually achieve their £1k monthly second income.

Investing in a Stocks and Shares ISA can be riskier as markets go up and down. However, the higher annual returns they’ve regularly delivered could make this a better route to consider for retirement saving.

Let’s say that person invested regularly in a FTSE 250 tracker fund in a Stocks and Shares ISA instead.

If they chose this option, they could hit their £300k ISA target with a much lower £191 monthly contribution. That’s based on the FTSE 250’s long-term average annual return of 11%.

A top ETF

Past performance is not a guarantee of future returns. But products like the iShares FTSE 250 ETF (LSE:MIDD) have long proved an effective way of building substantial wealth while at the same time spreading risk.

They may, therefore, be a better option for risk-averse individuals who cherish the security of a Cash ISA.

By investing across the whole FTSE 250, exchange-traded funds (ETFs) like this provide exposure to hundreds of stocks spanning a multitude of sectors and regions. Therefore it can protect investors’ returns from troubles in one or two areas.

Furthermore, by investing cash across value, dividend, and growth shares, index funds like this can provide a smooth return across the economic cycle.

They may provide poorer returns than Cash ISAs during stock market downturns. But over the long term, funds like this in a Stocks and Shares ISA have proven an effective way of building wealth for retirement.

Royston Wild has no position in any of the shares mentioned. The Motley Fool UK has no position in any of the shares mentioned. Views expressed on the companies mentioned in this article are those of the writer and therefore may differ from the official recommendations we make in our subscription services such as Share Advisor, Hidden Winners and Pro. Here at The Motley Fool we believe that considering a diverse range of insights makes us better investors.

More on Investing Articles

Illustration of flames over a black background
Investing Articles

Recently released: December’s higher-risk, high-reward stock recommendation [PREMIUM PICKS]

Fire ideas will tend to be more adventurous and are designed for investors who can stomach a bit more volatility.

Read more »

Abstract 3d arrows with rocket
Growth Shares

Will the SpaceX IPO send this FTSE 100 stock into orbit?

How can British investors get exposure to SpaceX? Here is one FTSE 100 stock that might be perfect for those…

Read more »

Array of piggy banks in saturated colours on high colour contrast background
Investing Articles

Could drip-feeding £500 into the FTSE 250 help you retire comfortably?

Returns from FTSE 250 shares have rocketed to 10.6% over the last year. Is now the time to plough money…

Read more »

Passive and Active: text from letters of the wooden alphabet on a green chalk board
Investing Articles

How much does one need in an ISA for £2,056 monthly passive income?

The passive income potential of the Stocks and Shares ISA is higher than perhaps all other investments. Here's how the…

Read more »

Finger clicking a button marked 'Buy' on a keyboard
Investing Articles

The best time to buy stocks is when they’re cheap. Here’s 1 from my list

Buying discounted stocks can be a great way to build wealth and earn passive income. But investors need to be…

Read more »

Bus waiting in front of the London Stock Exchange on a sunny day.
Investing Articles

Martin Lewis just explained the stock market’s golden rule

Unlike cash, the stock market can quietly turn lump sums into serious wealth. So, what’s the secret sauce that makes…

Read more »

Close-up of British bank notes
Investing Articles

£5,000 invested in Greggs shares at the start of 2025 is now worth…

This year's been extremely grim for FTSE 250-listed Greggs -- but having slumped more than 40%, could its shares be…

Read more »

Investing Articles

Looking for shares to buy as precious metals surge? 3 things to remember!

Gold prices have been on a tear. So has silver. So why isn't this writer hunting for shares to buy…

Read more »