We have some exciting news to share! The Motley Fool UK has now become The Twelfth Magpie -- 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. This site is our new home, and there will be extra tweaks made across the coming few days as we settle in. So if anything looks a little off, please bear with us!

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.

Start early to build the biggest passive income pot

When we’re investing to build a passive income pot, it can be surprising just how much difference starting a few years earlier can make.

Young brown woman delighted with what she sees on her screen

Image source: Getty Images

You’re reading a free article with opinions that may differ from The Twelfth Magpie’s Premium Investing Services. Become a member today to get instant access to our top analyst recommendations, in-depth research, investing resources, and more. Learn more, and get a free 'Best Buy Now' stock!.

The purchasing power of the UK State Pension is steadily dwindling. And savers and investors today know we need to stash some cash away if we want a passive income to supplement our retirement years.

To me, investing in shares on the UK stock market is the way to do this. Shares have beaten other forms of investment hands down for more than a century now. Today I’m looking at some key strategy tips that I’ve picked up over the years from the experts.

Should you buy Rolls Royce shares today?

Before you decide, please take a moment to review this report first. Despite ongoing uncertainties from US tariffs to global conflicts, Mark Rogers and his team believe many UK shares still trade at substantial discounts, offering savvy investors plenty of potential opportunities to learn about.

That’s why this could be an ideal time to secure this valuable research – Mark’s analysts have scoured the markets to reveal 5 of his favourite long-term ‘Buys’. Please, don’t make any big decisions before seeing them.

The most important one is to start investing as early as we can. The difference a few extra years can make at the start can be quite an eye-opener. I’ll come to that shortly, but first I want to cover one other thing that can make a big difference.

Pay off debt

Debt can put a big dent in our long-term passive income plans. Warren Buffett is possibly the most successful investor who’s ever lived. And through his Berkshire Hathaway investment company, he’s produced an average annual return of a massive 20%.

But credit card debt at today’s typical rates would be enough to wipe out even Buffett-style investment returns. And compared to the single-digit annual returns that most of us are more likely to achieve, debt could destroy any hopes of achieving a passive income in retirement.

Most experts then recommend paying down debts before starting to invest, excluding low-interest mortgage debt.

The difference the years make

How much difference will it really make if we start investing as early as we can? Let’s imagine two young investors (who I’ll call Lily and Jack, picked randomly from currently popular baby names). Both are aged 20 and have just started started similarly paying jobs.

Lily invests £500 per month in UK shares right from her first pay packet. Let’s suppose she achieves an average annual return of 6.5%. UK shares have returned close to 5% plus inflation for more than a century, so I think that’s reasonably conservative.

After 40 years, Lily will have accumulated a little over a million pounds that she can use to generate passive income for her retirement years, and she’ll still only be 60. OK, I accept that not everyone will be able to afford that much from their first salary and that even if they can, returns can be less than I assumed.

10 years later

Jack, meanwhile, spends a decade of blowing all his spare cash before he starts to think about his long-term future. He then knuckles down. But to match Lily’s retirement pot by the same age, Jack would have to invest twice as much per month. Investing £1,000 every month for 30 years, Jack would also hit the million pound passive income pot.

In total, Lily would have invested £240,000 over 40 years to reach her million. But reaching the same goal would have cost Jack £360,000 over 30 years. And if Lily had kept increasing her monthly investments as she could afford to, Jack would probably have no chance of ever matching her.

I think that’s two lessons for those of us seeking to build a passive income pot for our retirement. We should pay off any debt. And start investing as early as we can.

Alan Oscroft 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

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

Up 27.1% in 6 months: a FTSE 100 share paying out 2.8% a year!

This undervalued FTSE 100 share has suddenly soared in 2026. The stock still offers a decent cash yield, plus the…

Read more »

Investing Articles

Could now be the time to buy great UK shares at bargain prices?

Some UK shares have been trading exuberantly, with the FTSE 100 hitting hew highs in 2026. Does that mean there…

Read more »

piggy bank, searching with binoculars
Investing Articles

Prediction: this stock could surge 51% in my SIPP and ISA by 2027

Ben McPoland explains why he's bullish on this growth stock in his ISA and SIPP portfolios, despite it falling 25%…

Read more »

Satellite on planet background
Investing Articles

Is SpaceX on my list of shares to buy in July?

SpaceX shares have been falling. But the wait for a return from the business might be longer than the wait…

Read more »

ISA coins
Investing Articles

£10,000 put in a Cash ISA at the start of 2026 is now worth…

We're only halfway through the year, but has a Cash ISA beaten stock market returns so far? Our writer digs…

Read more »

Young woman carrying bottle of Energise Sport to the gym
Investing Articles

Still stubbornly in pennies, will the JD Sports share price hit £1 again?

Christopher Ruane reckons the JD Sports share price looks cheap but it's already been in pennies for many months. What's…

Read more »

Middle aged businesswoman using laptop while working from home
Investing Articles

Can an ISA outperform the stock market? Yes – here’s how!

Many investors dream of using their ISA to do better than the market overall. This writer knows it's possible --…

Read more »

Asian man looking concerned while studying paperwork at his desk in an office
Investing Articles

Dear SpaceX stock fans, mark your calendar for 7 July

SpaceX stock is getting fast-tracked into the world's leading technology index. Should I buy shares of the rocket maker before…

Read more »