Here’s how much to put in your ISA if you hope for passive income of £21,000

Quitting work to stay off passive income feels like the last word dream, doesn’t it? No extra alarm clocks or commutes — simply dividends rolling in to cowl the payments, and extra..

That’s why so many UK traders tuck cash right into a portfolio of high-yielding dividend shares every month. And to get essentially the most bang for buck, utilizing a tax-free ISA can minimise how much goes to HMRC.

Please word that tax therapy is determined by the person circumstances of every shopper and could also be topic to change in future. The content material in this text is supplied for info functions solely. It’s not supposed to be, neither does it represent, any kind of tax recommendation. Readers are accountable for finishing up their very own due diligence and for acquiring skilled recommendation earlier than making any funding selections.

However how much ought to you actually put in every month to hit one thing like £21,000 a yr in income?

Operating the numbers

Income portfolios chasing high-yield shares typically obtain 6%-8% yields. To generate £21,000 yearly, you’d want a pot of £262,500 at 8%, or £350,000 at 6% — a hefty sum, however do-able over time.

Let’s be beneficiant and say you obtain a barely above-average 10% whole return yearly (with dividends reinvested). Investing £500 month-to-month compounds to round £303,283 after 18 years. At 7% yield, that spits out £21,229 in dividends.

ONS knowledge exhibits the UK median full-time wage is £39,039 a yr, or £2,600 month-to-month after tax. If you can survive on simply £2,100 a month by trimming bills, you may afford that £500.

Naturally, something much less would simply take a couple of further years, so the earlier you begin, the higher. However even traders in their mid-40s ought to have greater than sufficient time earlier than retirement.

Inventory looking

To intention for that 10% return, don’t simply chase sky-high yields — unfold danger by constructing a stable, diversified portfolio.

Right here’s one instance mixing progress and income shares throughout sectors together with engineering, banking, insurance coverage, property, and retail.

This combine achieved annualised whole returns of 11% since 2016, however the common yield’s a bit low at 5.2%. To treatment this, you may weigh extra towards increased yielders like Authorized & Normal as soon as the pot is large enough.

Why Authorized & Normal?

Authorized & Normal’s a FTSE 100 insurance coverage large with a really lengthy and dependable dividend historical past. In 2025, it posted a full-year dividend of 21.79p, up 2%, with analysts eyeing a 8.7% potential yield forward.

The ahead price-to-earnings (P/E) is 10.5, cheap versus its 10-year common of 9.1, suggesting truthful worth. Earnings grew 9% in 2025, with 2026 forecasts on the excessive finish of 6-9%.

These are typical traits of a sustainable income inventory, quite than a progress chief.

But it surely’s nonetheless dangerous in some methods. Rate of interest swings can harm funding corporations, credit score spreads can widen on bonds, and longevity tendencies can pressure pensions. Luckily, its pension danger switch enterprise helps mitigate these dangers.

Ultimate ideas

A passive income stream in retirement can spell the distinction between surviving and thriving. It cuts out the stress about whether or not a pension will probably be ample and reduces the necessity to dip into financial savings.

However the payoff doesn’t come straightforward. You need to stick to the plan, do the analysis, and make monetary sacrifices. Crucial step is the primary one — begin small in an ISA, keep diversified, and let compounding work.

Authorized & Normal’s a very good instance of the kind of starter inventory to contemplate for an income portfolio. However situations change continuously, so don’t get too snug and at all times hold abreast of new developments as they come up.