We have some exciting news to share! The Motley Fool UK has now become an independent, UK-owned company, led by our long-serving UK management team — Mark Rogers, Chris Nials and Heather Adlington. In practical terms, it’s the same team you know, now fully focused on serving our UK readers and members.

Just as importantly, our approach remains unchanged: long-term, jargon-free, and on your side. We’ll be introducing a new name and brand over the coming weeks — we're very excited to share it with you and embark on this new chapter together!

Have £20k in your ISA to buy FTSE 100 shares? Here’s what I’d do now

Investing your ISA allowance in FTSE 100 (INDEXFTSE:UKX) shares? Here’s the strategy this Fool would adopt to grow your wealth.

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.

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.

Having a Stocks and Shares ISA is a no-brainer for the vast majority of private investors, even if they just want to stick with FTSE 100 shares. After all, any profits you make, or dividends you receive within this account, won’t be taxed. That’s a big positive when you consider the life-changing power of compound interest coupled with the fact that you can currently put up to £20,000 to work in the markets every year.

So, what sort of strategy should someone adopt if they have the full allowance to invest but only want to pick from the UK’s biggest companies? Here’s my take.

Buy ‘quality’ FTSE 100 shares

While it’s too soon to know the full economic cost of the coronavirus, one way of mitigating its impact on your wealth is to seek out quality stocks. 

Now, it would be a mistake to assume that all FTSE 100 shares are worthy of your cash. A company can be huge (and trading on a cheap valuation) and yet actually be a very poor investment if, say, it operates in a crowded sector. Poor earnings growth, high fixed costs, and big debts can also hold it back. 

My preference, therefore, is for companies with great brands, sound balance sheets, and/or large market shares. I’m also looking for firms that earn above-average returns on the money they invest in their businesses. Think of this as their own ‘interest rate’, just like you’d get with a savings account. Anything above 20% or so, gets my attention. 

This is why I own a stock like Rightmove. It’s suffering in 2020, but I’m confident that boasting the above qualities will help it bounce back, in time. 

Diversify (but not too much)

Buying quality still counts for little if you’re only investing in one or two parts of the market. You don’t need me to tell you how horrific 2020 has been so far for those companies operating in the airline sector (easyJet, IAG) and the oil industry (Royal Dutch Shell, BP). Spreading your cash around is prudent. 

Having said this, it’s also a fact that the more FTSE 100 shares you hold, the more closely your portfolio will resemble the index. That’s problematic, because the goal of stock-picking should be to beat the return of the index, not replicate it. You may as well buy a cheap exchange-traded fund, accept the market return, and do something else.

Another reason for buying only your best ideas comes down to management. The larger your portfolio, the more time and energy you’ll need to expend staying in touch with your holdings.  

Expect volatility

Pick up any financial paper at the moment and you’ll get a mish-mash of people saying that stocks will hang on to their recent gains and others saying that we’re heading for another leg down. To save you pondering things any further than you need to, I can confidently say it’s pretty much impossible to know with any certainty. 

What I think we can expect over the next few months is volatility. This being the case, it may be worth investing your money in installments. Pound-cost averaging (investing the same amount on a monthly basis, for example) into FTSE 100 stocks is psychologically much easier than investing all in one go. It should also help to smooth out returns over time. 

Paul Summers owns shares in Rightmove. The Motley Fool UK has recommended Rightmove. 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

British pound data
Investing Articles

2 UK shares to consider avoiding as the FTSE 100 extends losses

As the FTSE 100 dips for the second time this year, Mark Hartley weighs up market sentiment and considers two…

Read more »

Young brown woman delighted with what she sees on her screen
Investing Articles

How to invest £125 a month in UK shares to target a £39,039 annual passive income

Muhammad Cheema explains how an investor could earn the current median salary in the UK as passive income by making…

Read more »

Investor looking at stock graph on a tablet with their finger hovering over the Buy button
Investing Articles

These white-hot FTSE 250 growth shares are on sale today!

Royston Wild loves a good bargain. Here he reveals two FTSE 250 shares that all savvy UK stock investors should…

Read more »

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.
Investing Articles

How much do you need an ISA for a £31,352 second income?

Investing regularly in a Stocks and Shares ISA can generate a significant second income in retirement. Royston Wild explains how.

Read more »

Aston Martin DBX - rear pic of trunk
Investing Articles

With the Aston Martin share price in pennies, is it in bargain territory?

With the Aston Martin share price at a fraction of what it once was, is it a bargain? Our writer…

Read more »

A hiker and their dog walking towards the mountain summit of High Spy from Maiden Moor at sunrise
Investing Articles

How I plan to lock in sustainable growth on the FTSE 100 in the coming years

Mark Hartley takes a sobering look at the future, and outlines a plan to target FTSE 100 sectors with lower…

Read more »

Close-up image depicting a woman in her 70s taking British bank notes from her colourful leather wallet.
Investing Articles

What are the FTSE’s most lucrative high-yield shares?

Our writer zooms in one one of a handful of high-yield FTSE 100 shares to explain why he thinks it…

Read more »

Businessman with tablet, waiting at the train station platform
Investing Articles

Why bother with a SIPP now rather than wait 10 years?

Interested in a SIPP but putting it off to give yourself time to think? Christopher Ruane explains why that could…

Read more »