Most people who haven’t started investing assume they need a lot of money. A few thousand pounds, at least. Maybe ten. Some round number that signals “now I’m a proper grown-up with proper savings, and I can do the proper grown-up thing.”
That belief keeps people out of the market for years. Sometimes decades.
It’s also wrong.
The honest answer to “how much do I need to start” is somewhere between £1 and £25 a month, depending on the platform you choose. The bigger question — the one that actually matters — is whether you’re starting at all.
The minimums on real UK platforms
Let’s get the practical numbers out of the way. Here’s roughly what the main UK investment platforms ask for as a starting point at the time of writing:
- Vanguard Investor: £100 lump sum or £100/month for monthly contributions. Funds within their range can be bought from £500 lump sum or £100/month.
- Hargreaves Lansdown: £100 lump sum or £25/month into their Stocks and Shares ISA.
- AJ Bell: £25/month or a £500 lump sum.
- InvestEngine: £100 minimum, no monthly minimum, ETFs only.
- Trading 212: £1 minimum on their ISA. Yes, one pound.
- Moneybox: From £1 — they round up your spare change from card purchases.
So the floor is essentially the loose change in your pocket. If you can find £25 a month that isn’t already doing something more important, you can open a Stocks and Shares ISA and start investing this week.
Why “wait until I have enough” is the wrong question
The instinct to wait until you have a meaningful pot of money is understandable. It feels responsible. It feels like you should know what you’re doing before you start.
The problem is that this thinking gets the maths backwards. The thing investing rewards is time, not size. A small amount invested early will, over a long enough period, beat a large amount invested late. That’s not a motivational poster — it’s just how compound growth works.
Here’s a quick illustration. Imagine two people:
- Anna invests £50 a month from age 25. She stops at 35 and never adds another penny. Total contributed: £6,000.
- Ben does nothing until he’s 35, then invests £50 a month every month until he’s 65. Total contributed: £18,000.
Assuming a 6% annual real return (a reasonable long-run estimate after inflation for a global equity portfolio), at age 65:
- Anna’s pot: roughly £40,000.
- Ben’s pot: roughly £49,000.
Ben put in three times as much money and ended up only slightly ahead. If Anna had simply kept going at £50/month instead of stopping, she’d have over £80,000 — roughly double Ben’s outcome.
The lesson isn’t that £50 a month is a magic number. It’s that small contributions started early are doing real work, and that work cannot be replicated by waiting for a bigger lump sum.
What actually matters when you’re starting small
If you’re investing £25 or £50 a month, the things that would matter to a wealthy investor — clever tax planning, sophisticated asset allocation, picking the optimal global index — make almost no measurable difference to your outcome. What matters is much more basic.
A tax-efficient wrapper. Open a Stocks and Shares ISA. Your £20,000 annual ISA allowance is comfortably more than you’re going to use, and the wrapper means you’ll never owe income tax or capital gains tax on what your investments earn. It’s the most generous tax break the government offers ordinary savers, and it costs you nothing to take advantage of it.
A low-cost fund. A single global tracker fund — something that holds shares in thousands of companies across the world — is enough. You don’t need three. You don’t need a bond fund yet. You don’t need to think about geographic weightings. One global equity tracker, charging less than 0.25% a year, will do the job for years before you need to think harder.
A direct debit you don’t cancel. Set up an automatic monthly transfer the day after payday and forget about it. The single most reliable predictor of long-term investing success is whether the money keeps going in. Markets will do whatever markets do; your job is to keep contributing when they’re up, when they’re down, and when the news is alarming.
That’s it. That’s the whole starter kit.
What you do not need
It’s worth being clear about what isn’t required, because the financial industry has an interest in suggesting otherwise.
You don’t need a financial advisor for an account worth £500. Their fees would eat your portfolio alive.
You don’t need to “do your research” on individual companies. You’re not picking stocks. You’re buying a fund that holds thousands of them, on the sensible assumption that the global economy will be larger in 30 years than it is today.
You don’t need to understand what’s happening in the markets this week. Long-term investing is, by design, almost completely indifferent to short-term news.
You don’t need to wait for a “good time to invest.” There is no good time. There is only now and later, and later is always worse.
The real cost of waiting
Here’s the awkward truth about the “I’ll start when I have more money” mindset. It very rarely turns into “now I have more money, so I’ll start.” It turns into “I have more money but my expenses have grown too, so I’ll start when things settle down.”
Things never settle down. There’s always a wedding, a car repair, a new sofa, a baby, a kitchen, a holiday you’ve earned, a redundancy, a slightly tighter month than expected. If your test for starting is “once life is calm enough to think about it,” you will be 60 before you start, and by then the most valuable years of compounding will be behind you.
The alternative is starting at £25 a month with the imperfect plan you have right now, and adjusting later when you have a better one. That’s a much lower bar than most people think they need to clear.
A practical first step
If you’ve been waiting for permission to start small: this is it.
- Pick a UK platform with low minimums and low fees. (We compare them in Platforms & Charges.)
- Open a Stocks and Shares ISA.
- Set up a monthly direct debit for whatever amount you can genuinely afford to leave alone for at least five years — even if that’s £25.
- Buy a single global equity index fund.
- Don’t check it for six months.
The amount of money you start with matters far less than the date you start on. You can always increase the contribution. You cannot get back the years you spent waiting.
This article is for information and education only and does not constitute financial advice. Investments can fall as well as rise in value and you may get back less than you invest.